summaryrefslogtreecommitdiffstats
path: root/third_party/rust/getrandom/src/vxworks.rs
blob: 6cb5d52fefa12866d6289651bdfaea5be3565c82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
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::{util_libc::last_os_error, 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(Error::VXWORKS_RAND_SECURE);
        } 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(())
}