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

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]
@@ -171,6 +172,7 @@ mod util;
     target_os = "openbsd",
     target_os = "redox",
     target_os = "solaris",
+    target_os = "vxworks",
 ))]
 #[allow(dead_code)]
 mod util_libc;
@@ -225,6 +227,8 @@ 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 +1,36 @@
+// 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;
+use crate::util_libc::last_os_error;
+use core::sync::atomic::{AtomicBool, Ordering::Relaxed};
+
+static RNG_INIT: AtomicBool = AtomicBool::new(false);
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    while !RNG_INIT.load(Relaxed) {
+        let ret = unsafe { libc::randSecure() };
+        if ret < 0 {
+            return Err(last_os_error());
+        } 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(())
+}