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//! Implementation for VxWorks
use crate::{util_libc::last_os_error, Error};
use core::{
mem::MaybeUninit,
sync::atomic::{AtomicBool, Ordering::Relaxed},
};
pub fn getrandom_inner(dest: &mut [MaybeUninit<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() as *mut u8, chunk.len() as i32) };
if ret != 0 {
return Err(last_os_error());
}
}
Ok(())
}