Add VxWorks support

.travis.yml

@@ -118,6 +118,7 @@ matrix:
  - cargo xbuild --target=x86_64-unknown-uefi
  - cargo xbuild --target=x86_64-unknown-hermit
  - cargo xbuild --target=x86_64-unknown-l4re-uclibc
+ - cargo xbuild --target=x86_64-wrs-vxworks
  # also test minimum dependency versions are usable
  - cargo generate-lockfile -Z minimal-versions
  - cargo build --target=x86_64-sun-solaris

Cargo.toml

@@ -25,8 +25,8 @@ cfg-if = "0.1"
 compiler_builtins = { version = "0.1", optional = true }
 core = { version = "1.0", optional = true, package = "rustc-std-workspace-core" }
 
-[target.'cfg(any(unix, target_os = "redox"))'.dependencies]
-libc = { version = "0.2.62", default-features = false }
+[target.'cfg(unix)'.dependencies]
+libc = { version = "0.2.64", default-features = false }
 
 [target.'cfg(target_os = "wasi")'.dependencies]
 wasi = "0.5"

src/error.rs

@@ -138,6 +138,7 @@ pub(crate) const BINDGEN_CRYPTO_UNDEF: Error = internal_error!(7);
 pub(crate) const BINDGEN_GRV_UNDEF: Error = internal_error!(8);
 pub(crate) const STDWEB_NO_RNG: Error = internal_error!(9);
 pub(crate) const STDWEB_RNG_FAILED: Error = internal_error!(10);
+pub(crate) const RAND_SECURE_FATAL: Error = internal_error!(11);
 
 fn internal_desc(error: Error) -> Option<&'static str> {
  match error {
@@ -152,6 +153,7 @@ fn internal_desc(error: Error) -> Option<&'static str> {
  BINDGEN_GRV_UNDEF => Some("wasm-bindgen: crypto.getRandomValues is undefined"),
  STDWEB_NO_RNG => Some("stdweb: no randomness source available"),
  STDWEB_RNG_FAILED => Some("stdweb: failed to get randomness"),
+ RAND_SECURE_FATAL => Some("randSecure: random number generator module is not initialized"),
  _ => None,
  }
 }

src/lib.rs

@@ -27,6 +27,7 @@
 //! | Haiku | `/dev/random` (identical to `/dev/urandom`)
 //! | L4RE, SGX, UEFI | [RDRAND][18]
 //! | Hermit | [RDRAND][18] as [`sys_rand`][22] is currently broken.
+//! | VxWorks | `randABytes` after checking entropy pool initialization with `randSecure`
 //! | Web browsers | [`Crypto.getRandomValues`][14] (see [Support for WebAssembly and ams.js][14])
 //! | Node.js | [`crypto.randomBytes`][15] (see [Support for WebAssembly and ams.js][16])
 //! | WASI | [`__wasi_random_get`][17]
@@ -160,6 +161,10 @@ pub use crate::error::Error;
 #[allow(dead_code)]
 mod util;
 
+#[cfg(target_os = "vxworks")]
+#[allow(dead_code)]
+mod util_libc;
+
 cfg_if! {
  // Unlike the other Unix, Fuchsia and iOS don't use the libc to make any calls.
  if #[cfg(any(target_os = "android", target_os = "dragonfly", target_os = "emscripten",
@@ -221,6 +226,8 @@ cfg_if! {
  #[path = "solaris_illumos.rs"] mod imp;
  } else if #[cfg(target_os = "wasi")] {
  #[path = "wasi.rs"] mod imp;
+ } else if #[cfg(target_os = "vxworks")] {
+ #[path = "vxworks.rs"] mod imp;
  } else if #[cfg(all(windows, getrandom_uwp))] {
  #[path = "windows_uwp.rs"] mod imp;
  } else if #[cfg(windows)] {

src/util_libc.rs

@@ -26,7 +26,10 @@ cfg_if! {
 }
 
 pub fn last_os_error() -> Error {
+ #[cfg(not(target_os = "vxworks"))]
  let errno = unsafe { *errno_location() };
+ #[cfg(target_os = "vxworks")]
+ let errno = unsafe { libc::errnoGet() };
  if errno > 0 {
  Error::from(NonZeroU32::new(errno as u32).unwrap())
  } else {

src/vxworks.rs

@@ -0,0 +1,35 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for VxWorks
+use crate::error::{Error, RAND_SECURE_FATAL};
+use crate::util_libc::last_os_error;
+use core::sync::atomic::{AtomicBool, Ordering::Relaxed};
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+ static RNG_INIT: AtomicBool = AtomicBool::new(false);
+ while !RNG_INIT.load(Relaxed) {
+ let ret = unsafe { libc::randSecure() };
+ if ret < 0 {
+ return Err(RAND_SECURE_FATAL);
+ } else if ret > 0 {
+ RNG_INIT.store(true, Relaxed);
+ break;
+ }
+ unsafe { libc::usleep(10) };
+ }
+
+ // Prevent overflow of i32
+ for chunk in dest.chunks_mut(i32::max_value() as usize) {
+ let ret = unsafe { libc::randABytes(chunk.as_mut_ptr(), chunk.len() as i32) };
+ if ret != 0 {
+ return Err(last_os_error());
+ }
+ }
+ Ok(())
+}