[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom
pavelsavara:wasisdk-mono

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Summary

This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model
bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the
new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables
HTTP/socket test scenarios that the WASI handler does not support.

ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1

Motivation

The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the
current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged
union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which
broke the existing System.Net.Sockets event loop. This brings the toolchain current and
restores socket functionality on the new wasi-libc.

Changes

Toolchain / build infrastructure

  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    no longer provided / needed by WASI SDK 33.0.

Run-script cleanup

  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.

Test AppBundle generation

  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    Test projects are OutputType=Library, for which the property defaults to false; unlike
    browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    must run to populate the AppBundle.

Regenerated WASIp2 bindings (0.2.0 → 0.2.8)

  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    (Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.

Sockets on the new wasi-libc descriptor table

wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.

  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:
    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.

Test scenario adjustments

  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    WASI handler does not support (authentication, pre-authentication, proxy, client/server
    certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.

@pavelsavarapavelsavara added this to the 11.0.0 milestone Jun 4, 2026
@pavelsavarapavelsavara self-assigned this Jun 4, 2026
CopilotAI review requested due to automatic review settings June 4, 2026 16:52
@pavelsavarapavelsavara added arch-wasm WebAssembly architecture area-Build-mono os-wasi Related to WASI variant of arch-wasm labels Jun 4, 2026
@pavelsavarapavelsavara mentioned this pull request Jun 4, 2026
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Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
See info in area-owners.md if you want to be subscribed.

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Pull request overview

This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.

Changes:

  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.

Reviewed changes

Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.

Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.

Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
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/azp list

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/azp run runtime-wasm

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pavelsavara marked this pull request as ready for review June 5, 2026 13:33
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Pull request overview

Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.

Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets
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/azp run runtime-wasm

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@pavelsavara
pavelsavara merged commit e17d74b into dotnet:mainJun 7, 2026
190 of 192 checks passed
@pavelsavara
pavelsavara deleted the wasisdk-mono branch June 7, 2026 08:19
lewing added a commit to lewing/runtime that referenced this pull request Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@dotnet-maestrodotnet-maestroBot mentioned this pull request Jun 8, 2026
Merged
@pavelsavarapavelsavara mentioned this pull request Jun 8, 2026
Merged
pavelsavara added a commit to dotnet/dotnet-buildtools-prereqs-docker that referenced this pull request Jun 9, 2026
@pavelsavara
to matchdotnet/runtime#128997
7783650
lewing added a commit to lewing/runtime that referenced this pull request Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit to lewing/runtime that referenced this pull request Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit to lewing/runtime that referenced this pull request Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
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pavelsavara merged 12 commits into
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pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@dotnet-maestrodotnet-maestroBot
mentioned this pull request
Jun 8, 2026
 Merged

@pavelsavarapavelsavara
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Jun 8, 2026
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pavelsavara added a commit
to dotnet/dotnet-buildtools-prereqs-docker
that referenced
this pull request
Jun 9, 2026
@pavelsavara
to matchdotnet/runtime#128997
7783650
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
Merged
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
@pavelsavarapavelsavara
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Jun 4, 2026
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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@pavelsavara
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merged commit e17d74b
into
dotnet:mainJun 7, 2026

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deleted the

wasisdk-mono

branch
June 7, 2026 08:19
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@dotnet-maestrodotnet-maestroBot
mentioned this pull request
Jun 8, 2026
 Merged

@pavelsavarapavelsavara
mentioned this pull request
Jun 8, 2026
 Merged

pavelsavara added a commit
to dotnet/dotnet-buildtools-prereqs-docker
that referenced
this pull request
Jun 9, 2026
@pavelsavara
to matchdotnet/runtime#128997
7783650
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
Merged
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
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@pavelsavarapavelsavara
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Jun 4, 2026

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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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wasisdk-mono

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June 7, 2026 08:19
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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to matchdotnet/runtime#128997
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to lewing/runtime
that referenced
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Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
@pavelsavarapavelsavara
added this to the 11.0.0 milestone
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
Merged
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
@pavelsavarapavelsavara
added this to the 11.0.0 milestone
Jun 4, 2026
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Jun 4, 2026
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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June 7, 2026 08:19
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@dotnet-maestrodotnet-maestroBot
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Jun 8, 2026
 Merged

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Jun 8, 2026
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pavelsavara added a commit
to dotnet/dotnet-buildtools-prereqs-docker
that referenced
this pull request
Jun 9, 2026
@pavelsavara
to matchdotnet/runtime#128997
7783650
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
Merged
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
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Jun 4, 2026

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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
@pavelsavarapavelsavara
added this to the 11.0.0 milestone
Jun 4, 2026
@pavelsavarapavelsavara
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Jun 4, 2026
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June 4, 2026 16:52
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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@pavelsavara
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merged commit e17d74b
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dotnet:mainJun 7, 2026

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deleted the

wasisdk-mono

branch
June 7, 2026 08:19
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@dotnet-maestrodotnet-maestroBot
mentioned this pull request
Jun 8, 2026
 Merged

@pavelsavarapavelsavara
mentioned this pull request
Jun 8, 2026
 Merged

pavelsavara added a commit
to dotnet/dotnet-buildtools-prereqs-docker
that referenced
this pull request
Jun 9, 2026
@pavelsavara
to matchdotnet/runtime#128997
7783650
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc - #128997
Merged
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
Jun 7, 2026
Merged
[WASI][Mono] Upgrade WASI SDK / wasmtime / WASIp2 to 0.2.8 and fix sockets for new wasi-libc#128997
pavelsavara merged 12 commits into
dotnet:mainfrom 
pavelsavara:wasisdk-mono
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@pavelsavarapavelsavara
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Jun 4, 2026

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Summary
This branch upgrades the Mono WASI toolchain and regenerates the WASIp2 component-model

bindings against the 0.2.8 interfaces. It also fixes System.Net.Sockets to work with the

new wasi-libc descriptor-table layout, removes the obsolete Node.js run scripts, and disables

HTTP/socket test scenarios that the WASI handler does not support.
ComponentOldNew
WASI SDK25.033.0
wasmtime27.0.045.0.0
WASIp2 interfaces (wasi:io, wasi:http, wasi:clocks)0.2.00.2.8
wit-bindgen (C#)0.32.00.57.1
Motivation
The 0.2.0 snapshot of the WASI SDK and the WASIp2 interfaces had drifted well behind the

current ecosystem. wasi-libc also changed its internal socket descriptor table from a tagged

union to a "fat pointer" + vtable design and now creates the embedded pollables lazily, which

broke the existing System.Net.Sockets event loop. This brings the toolchain current and

restores socket functionality on the new wasi-libc.
Changes
Toolchain / build infrastructure
  • eng/AcquireWasiSdk.targets, src/mono/wasi/build/WasiApp.targets: bump expected WASI SDK to
    33.0. The version check now matches by prefix (StartsWith) so future patch releases of the
    
same major are accepted.
  • src/mono/wasi/wasmtime-version.txt: bump wasmtime to 45.0.0.
  • eng/native/gen-buildsys.cmd / gen-buildsys.sh: drop the Node.js-based
    CMAKE_CROSSCOMPILING_EMULATOR (the --experimental-wasi-unstable-preview1 Node path is no
    
longer used).
  • src/mono/wasi/wasi.proj, WasiApp.targets: stop linking -lwasi-emulated-pthread, which is
    
no longer provided / needed by WASI SDK 33.0.
Run-script cleanup
  • WasiApp.targets: remove the _WasmGenerateNodeScripts target and the generated node.mjs /
    run-node.sh files. WASI apps run under wasmtime via the existing
    _GenerateRunWasmtimeScript target.
Test AppBundle generation
  • eng/testing/tests.wasi.targets: force WasmGenerateAppBundle=true for WASI test projects.
    
Test projects are OutputType=Library, for which the property defaults to false; unlike
    
browser there is no SDK that bundles via static web assets, so the in-tree WasiAppBuilder
    
must run to populate the AppBundle.
Regenerated WASIp2 bindings (0.2.0 → 0.2.8)
  • System.Net.Http/.../WasiHttpHandler/* and System.Private.CoreLib/.../Threading/Wasi/*:
    
regenerated with wit-bindgen 0.57.1. The new generator changes naming conventions
    
(Method.get() → Method.Get(), ErrorCode.DNS_TIMEOUT → ErrorCode.Tags.DnsTimeout,
    Result.ok/err → Ok/Err, IPoll/ITypes → IPollImports/ITypesImports, etc.).
  • Hand-written consumers (WasiHttpInterop.cs, WasiHttpHandler.cs, WasiInputStream.cs,
    WasiOutputStream.cs, WasiEventLoop.cs, TimerQueue.Wasi.cs) updated to the new API names.
  • .wit world files and the generate-wasi-*-bindings.{ps1,sh} scripts updated to pin
    0.2.8 and wit-bindgen 0.57.1.
  • .csproj / .projitems compile lists updated to the new generated file names.
Sockets on the new wasi-libc descriptor table
wasi-libc replaced the tagged-union descriptor entry with a fat pointer ({ void* data; descriptor_vtable_t* vtable; }) and now creates the per-socket pollables lazily.
  • src/native/libs/System.Native/pal_networking.c / .h / entrypoints.c:

    • SystemNative_GetWasiSocketDescriptor now returns the descriptor data pointer plus a
      socketType (1 = TCP/stream, 2 = UDP/datagram) discriminated via getsockopt(SO_TYPE),
      
since the vtable that previously identified the kind is a private static symbol.
    • New SystemNative_WasiSubscribeSocketPollable lazily calls the wasi-libc subscribe
      
imports to materialize a pollable handle on demand.
  • Interop.SocketEvent.cs: matching LibraryImport signature updates.
  • SocketPal.Wasi.cs: struct layouts updated to mirror the new wasi-libc
    tcp_socket_t / udp_socket_t (field reorder, bool → byte, error_code widened to
    int, trailing timeout fields). The obsolete descriptor_table_entry_* types are removed.
  • SocketAsyncEngine.Wasi.cs: BeforePollHook discriminates on the native socketType and
    
uses a new EnsurePollable helper that subscribes lazily (storing the handle back so
    
wasi-libc owns and later drops it) instead of reading a pre-existing pollable handle.
Test scenario adjustments
  • System.Net.Http tests: added [SkipOnPlatform(TestPlatforms.Wasi, …)] for scenarios the
    
WASI handler does not support (authentication, pre-authentication, proxy, client/server
    
certificates, decompression, sync Send, version selection, MaxConnectionsPerServer,
    
SOCKS proxy, zero-byte read / ConnectCallback, mini-stress / System.Net.Security,
    SocketsHttpHandler argument-validation cases). Several flaky cancellation/metrics cases are
    
marked [ActiveIssue(98957, TestPlatforms.Wasi)].
  • System.Net.Sockets tests: skip Socket.Blocking and DualMode scenarios unsupported on WASI.
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Pull request overview
This PR updates the Mono WASI toolchain (WASI SDK / wasmtime) and regenerates the WASIp2 (0.2.8) component-model bindings used by CoreLib and the WASI HTTP handler. It also updates the WASI socket event loop plumbing to match wasi-libc’s new descriptor-table layout and lazy pollable creation, cleans up obsolete Node.js run scripts, and adjusts tests for unsupported WASI scenarios.
Changes:
  • Upgrade toolchain inputs (WASI SDK 33.0, wasmtime 45.0.0) and remove Node-based emulation/run-script generation.
  • Regenerate WASIp2 bindings to 0.2.8 and update managed call sites accordingly.
  • Update WASI socket descriptor resolution + pollable subscription (native + managed) and adjust System.Net tests to skip unsupported features on WASI.
Reviewed changes
Copilot reviewed 68 out of 70 changed files in this pull request and generated 5 comments.
Show a summary per file
FileDescription
src/native/libs/System.Native/pal_networking.hUpdates WASI socket descriptor API signature and adds pollable subscription export.
src/native/libs/System.Native/pal_networking.cImplements new WASI descriptor-table probing and lazy pollable subscription helper.
src/native/libs/System.Native/entrypoints.cExposes the new native entrypoint for managed interop.
src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.csUpdates LibraryImport signatures for the revised native WASI socket APIs.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Wasi.csMirrors updated wasi-libc tcp/udp socket struct layouts and removes obsolete descriptor tagged-union types.
src/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.csUses socketType discrimination + lazy pollable subscription to integrate with wasi-libc’s new lazy pollables.
src/mono/wasi/wasmtime-version.txtBumps the pinned wasmtime version.
src/mono/wasi/wasi.projRemoves obsolete -lwasi-emulated-pthread link flag for WASI SDK 33.
src/mono/wasi/build/WasiApp.targetsUpdates toolchain version check, removes Node run-script generation, and adjusts link flags.
eng/native/gen-buildsys.shRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI.
eng/native/gen-buildsys.cmdRemoves Node CMAKE_CROSSCOMPILING_EMULATOR usage for WASI (Windows).
eng/AcquireWasiSdk.targetsBumps acquired WASI SDK version to 33.0.
eng/testing/tests.wasi.targetsForces AppBundle generation for WASI test projects (OutputType=Library).
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/world.witUpdates WIT imports to WASIp2 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiEventLoop.csSwitches event loop to regenerated 0.2.8 poll/clock APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/TimerQueue.Wasi.csUpdates monotonic clock interop usage to 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/generate-wasi-poll-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitemsUpdates compile item list to new generated file names for 0.2.8.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.PollImportsInterop.csNew generated 0.2.8 poll imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.io.v0_2_8.IPollImports.csNew generated 0.2.8 poll imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.MonotonicClockImportsInterop.csNew generated 0.2.8 clock imports interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.Imports.wasi.clocks.v0_2_8.IMonotonicClockImports.csNew generated 0.2.8 clock imports API surface.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.PollInterop.csRemoves old generated 0.2.0 poll interop.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.io.v0_2_0.IPoll.csRemoves old generated 0.2.0 poll API.
src/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPollWorld.wit.imports.wasi.clocks.v0_2_0.MonotonicClockInterop.csRemoves old generated 0.2.0 clock interop.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.csUpdates generated support types for wit-bindgen 0.57.1 output.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld_component_type.witUpdates WIT package/interface versions from 0.2.0 to 0.2.8.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpHandler.csUpdates outgoing-handler invocation to regenerated 0.2.8 API surface.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpInterop.csUpdates conversions and error-code mapping to new generated enum/tag conventions.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiInputStream.csUpdates stream handling to regenerated 0.2.8 stream error tags.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiOutputStream.csUpdates stream handling imports to regenerated 0.2.8 API names.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.shUpdates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/generate-wasi-http-bindings.ps1Updates binding generation script to fetch 0.2.8 and wit-bindgen 0.57.1.
src/libraries/System.Net.Http/src/System.Net.Http.csprojUpdates compile include list to new generated 0.2.8 files.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.io.v0_2_8.*Adds new generated 0.2.8 io/poll/streams/error interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.http.v0_2_8.*Adds new generated 0.2.8 http types/outgoing-handler interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.Imports.wasi.clocks.v0_2_8.*Adds new generated 0.2.8 clocks interop surfaces.
src/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttpWorld.wit.imports.v0_2_0.Removes old generated 0.2.0 HTTP/io/clocks interop surfaces.
src/libraries/System.Net.Http/tests/FunctionalTests/SocksProxyTest.csSkips proxy tests on WASI where handler support is absent.
src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.csAdds WASI skips for unsupported SocketsHttpHandler scenarios.
src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.csSkips ConnectCallback scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.csMarks known-flaky metrics tests as ActiveIssue on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpContentTest.csSkips/marks unsupported or flaky scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientTest.csSkips unsupported synchronous send / version-selection scenarios on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.csSkips mini-stress scenarios that require System.Net.Security on WASI.
src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.csAvoids cert-validation callback configuration on WASI.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Proxy.csSkips proxy tests on WASI handler.
src/libraries/Common/tests/System/Net/Http/HttpClientHandlerTest.Authentication.csSkips authentication/preauth tests on WASI handler.
src/libraries/System.Net.Sockets/tests/FunctionalTests/SocketAsyncEventArgsTest.csSkips DualMode tests on WASI.
src/libraries/System.Net.Sockets/tests/FunctionalTests/CreateSocketTests.csSkips Socket.Blocking tests on WASI.
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/native/libs/System.Native/pal_networking.c
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs

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Pull request overview
Copilot reviewed 70 out of 72 changed files in this pull request and generated 5 comments.
Comment threadsrc/libraries/System.Private.CoreLib/src/System/Threading/Wasi/WasiPoll.cs
Comment threadsrc/libraries/System.Net.Http/src/System/Net/Http/WasiHttpHandler/WasiHttp.cs
Comment threadsrc/libraries/System.Net.Sockets/src/System/Net/Sockets/SocketAsyncEngine.Wasi.cs
Comment threadeng/testing/tests.wasi.targets
Comment threadsrc/mono/wasi/build/WasiApp.targets

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wasisdk-mono

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lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 7, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
e9e40c9
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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to matchdotnet/runtime#128997
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Jun 23, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
0bd5d42
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 25, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
57fb166
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
lewing added a commit
to lewing/runtime
that referenced
this pull request
Jun 30, 2026
@lewing
[wasi] Add CoreCLR-WASI build wiring (subset ofdotnet#128465seed)
bc8d205
Reapplies the build-system subset of the WASI-target seed commit from
PR dotnet#128465 (2d2e1fb), adapted to the current pr/128997 base:
- eng/Subsets.props: register TargetsWasi as a CoreCLR-supported OS,
default flavor + DefaultCoreClrSubsets (dropped provision.wasisdk —
there is no AcquireWasiSdk.proj; SDK acquisition is wired through
runtime.proj and native.wasm.targets instead).
- eng/native.wasm.targets: import AcquireWasiSdk.targets; mirror the
Browser+CoreCLR ItemGroup for Wasi+CoreCLR (GEN_PINVOKE +
PERFTRACING listen-port disables).
- eng/native/configurecompiler.cmake: emit TARGET_WASI under the unix
branch so it pairs with TARGET_BROWSER.
- eng/native/configureplatform.cmake: set CLR_CMAKE_HOST_UNIX +
CLR_CMAKE_TARGET_UNIX for WASI.
- src/coreclr/CMakeLists.txt: add WASI to FEATURE_STANDALONE_GC opt-out;
add the WASI compile-options block (emulated mman/signal/clocks/getpid,
sjlj for now (Phase 6 will switch to native wasm exceptions),
F_DUPFD_CLOEXEC/O_CLOEXEC defines, pal/wasi shim include dir);
exclude WASI from test-watchdog and tools/aot/jitinterface.
- src/coreclr/clrfeatures.cmake: untouched (FEATURE_EVENT_TRACE
condition was reworked upstream — main now enables event_trace for
browser CoreCLR via dotnet#128997, so the seed's exclusion no longer
applies. Leave WASI on the same path; revisit if the WASI build
fails on event_trace).
- src/coreclr/dlls/mscoree/exports.cpp: untouched (seed added debug
fprintfs later reverted in commit 3ca3028).
- src/coreclr/gc/unix/*: untouched (the gc/wasm/ subdir added in
dotnet#127328 already handles WASI; gc/unix is no longer compiled for
wasm targets).
- src/coreclr/runtime.proj: add AcquireWasiSdk to
BuildRuntimeDependsOnTargets for Wasi.
- src/coreclr/tools/CMakeLists.txt: exclude WASI from superpmi.
- src/coreclr/debug/debug-pal/CMakeLists.txt: keep
DEBUG_PAL_REFEREENCE_DIAGNOSTICSERVER off for WASI.
- src/coreclr/debug/debug-pal/unix/twowaypipe.cpp: stub mkfifo() on
WASI (ENOTSUP).
- src/coreclr/pal/src/CMakeLists.txt: skip libunwind on WASM hosts;
exclude debug/debug.cpp and exception/signal.cpp for WASI; skip
coreclrpal_dac libunwind on wasm. (mmap-wasi.c will be added in
Phase 3.)
- src/coreclr/pal/src/configure.cmake: guard pthread checks behind
PTHREAD_LIBRARY (WASI has no pthread); HAVE_SCHED_OTHER_ASSIGNABLE=0
for WASI.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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@lewinglewinglewing approved these changes
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