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