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gh-153711: Test availability for dup3() and pipe2() on iOS #155222

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e9a3acd
gh-153711: Test availability for dup3() and pipe2() on iOS
encukou Aug 5, 2026
001df7d
Fix configure
encukou Aug 5, 2026
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2 changes: 1 addition & 1 deletion Doc/library/os.rst
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Expand Up@@ -1448,7 +1448,7 @@ or `the MSDN <https://msdn.microsoft.com/en-us/library/z0kc8e3z.aspx>`_ on Windo
Return a pair of file descriptors ``(r, w)`` usable for reading and writing,
respectively.

.. availability:: Unix, macOS >= 27.0, not WASI, not iOS.
.. availability:: Unix, macOS >= 27.0, iOS >= 27.0, not WASI.

.. versionadded:: 3.3

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-08-05-10-13-23.gh-issue-153711.9g9dVz.rst
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@@ -0,0 +1,3 @@
On iOS, add :func:`os.pipe2`, and use the syscalls :manpage:`pipe2 (2)` and
:manpage:`dup3 (2)` internally, when available at both build-time and
run-time.
4 changes: 2 additions & 2 deletions Modules/posixmodule.c
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Expand Up@@ -504,8 +504,8 @@ static const unsigned int _Py_STATX_KNOWN = (STATX_BASIC_STATS | STATX_BTIME
# define HAVE_MKFIFOAT_RUNTIME __builtin_available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
# define HAVE_MKNODAT_RUNTIME __builtin_available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, *)
# define HAVE_PTSNAME_R_RUNTIME __builtin_available(macOS 10.13.4, iOS 11.3, tvOS 11.3, watchOS 4.3, *)
# define HAVE_DUP3_RUNTIME __builtin_available(macOS 27.0, *)
# define HAVE_PIPE2_RUNTIME __builtin_available(macOS 27.0, *)
# define HAVE_DUP3_RUNTIME __builtin_available(macOS 27.0, iOS 27.0, tvOS 27.0, watchOS 27.0, visionOS 27.0, *)
# define HAVE_PIPE2_RUNTIME __builtin_available(macOS 27.0, iOS 27.0, tvOS 27.0, watchOS 27.0, visionOS 27.0, *)

# define HAVE_POSIX_SPAWN_SETSID_RUNTIME __builtin_available(macOS 10.15, *)

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26 changes: 13 additions & 13 deletions configure
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6 changes: 3 additions & 3 deletions configure.ac
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Expand Up@@ -5493,7 +5493,7 @@ fi
AC_CHECK_FUNCS([ \
accept4 alarm bind_textdomain_codeset chmod chown clearenv \
clock closefrom close_range confstr \
copy_file_range ctermid dladdr dup execv explicit_bzero explicit_memset \
copy_file_range ctermid dladdr dup dup3 execv explicit_bzero explicit_memset \
faccessat fchmod fchmodat fchown fchownat fdopendir fdwalk fexecve \
fork fork1 fpathconf fstatat ftime ftruncate futimens futimes futimesat \
gai_strerror getegid geteuid getgid getgrent getgrgid getgrgid_r \
Expand All@@ -5502,7 +5502,7 @@ AC_CHECK_FUNCS([ \
getpwent getpwnam_r getpwuid getpwuid_r getresgid getresuid getrusage getsid getspent \
getspnam getuid getwd grantpt if_nameindex initgroups kill killpg lchown linkat \
lockf lstat lutimes madvise mbrtowc memrchr mkdirat mkfifo mkfifoat \
mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe \
mknod mknodat mktime mmap mremap nice openat opendir pathconf pause pipe pipe2 \
plock poll ppoll posix_fadvise posix_fallocate posix_openpt posix_spawn posix_spawnp \
posix_spawn_file_actions_addclosefrom_np \
pread preadv preadv2 process_vm_readv \
Expand DownExpand Up@@ -5540,7 +5540,7 @@ fi
# header definition prevents usage - autoconf doesn't use the headers), or
# raise an error if used at runtime. Force these symbols off.
if test "$ac_sys_system" != "iOS" ; then
AC_CHECK_FUNCS([dup3 getentropy getgroups pipe2 system])
AC_CHECK_FUNCS([getentropy getgroups system])
fi

AC_CHECK_DECL([dirfd],
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