vendor/getrandom-0.1.16/src/vxworks.rs

   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::error::{Error, RAND_SECURE_FATAL};
  11 use crate::util_libc::last_os_error;
  12 use core::sync::atomic::{AtomicBool, Ordering::Relaxed};
  13
  14 pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
  15     static RNG_INIT: AtomicBool = AtomicBool::new(false);
  16     while !RNG_INIT.load(Relaxed) {
  17         let ret = unsafe { libc::randSecure() };
  18         if ret < 0 {
  19             return Err(RAND_SECURE_FATAL);
  20         } else if ret > 0 {
  21             RNG_INIT.store(true, Relaxed);
  22             break;
  23         }
  24         unsafe { libc::usleep(10) };
  25     }
  26
  27     // Prevent overflow of i32
  28     for chunk in dest.chunks_mut(i32::max_value() as usize) {
  29         let ret = unsafe { libc::randABytes(chunk.as_mut_ptr(), chunk.len() as i32) };
  30         if ret != 0 {
  31             return Err(last_os_error());
  32         }
  33     }
  34     Ok(())
  35 }