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          | `randBytes`
 //! | 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]
@@ -225,6 +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/vxworks.rs

@@ -0,0 +1,34 @@
+// 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, ERRNO_NOT_POSITIVE};
+use core::num::NonZeroU32;
+
+extern "C" {
+    fn randBytes(buf: *mut u8, length: i32) -> i32;
+    // errnoLib.h
+    fn errnoGet() -> i32;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // Prevent overflow of i32
+    for chunk in dest.chunks_mut(i32::max_value() as usize) {
+        let ret = unsafe { randBytes(chunk.as_mut_ptr(), chunk.len() as i32) };
+        if ret == -1 {
+            let errno = unsafe { errnoGet() };
+            let err = if errno > 0 {
+                Error::from(NonZeroU32::new(errno as u32).unwrap())
+            } else {
+                ERRNO_NOT_POSITIVE
+            };
+            return Err(err);
+        }
+    }
+    Ok(())
+}