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1 | // Copyright 2018 Developers of the Rand project. |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
4 | // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
5 | // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | |
6 | // option. This file may not be copied, modified, or distributed | |
7 | // except according to those terms. | |
8 | ||
9 | //! Implementation for VxWorks | |
10 | use crate::{util_libc::last_os_error, Error}; | |
11 | use core::sync::atomic::{AtomicBool, Ordering::Relaxed}; | |
12 | ||
13 | pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { | |
14 | static RNG_INIT: AtomicBool = AtomicBool::new(false); | |
15 | while !RNG_INIT.load(Relaxed) { | |
16 | let ret = unsafe { libc::randSecure() }; | |
17 | if ret < 0 { | |
18 | return Err(Error::VXWORKS_RAND_SECURE); | |
19 | } else if ret > 0 { | |
20 | RNG_INIT.store(true, Relaxed); | |
21 | break; | |
22 | } | |
23 | unsafe { libc::usleep(10) }; | |
24 | } | |
25 | ||
26 | // Prevent overflow of i32 | |
27 | for chunk in dest.chunks_mut(i32::max_value() as usize) { | |
28 | let ret = unsafe { libc::randABytes(chunk.as_mut_ptr(), chunk.len() as i32) }; | |
29 | if ret != 0 { | |
30 | return Err(last_os_error()); | |
31 | } | |
32 | } | |
33 | Ok(()) | |
34 | } |