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//! Implementation for VxWorks
use crate::Error;
use core::{
cmp::Ordering::{Equal, Greater, Less},
mem::MaybeUninit,
sync::atomic::{AtomicBool, Ordering::Relaxed},
};
#[path = "../util_libc.rs"]
mod util_libc;
pub use crate::util::{inner_u32, inner_u64};
static RNG_INIT: AtomicBool = AtomicBool::new(false);
#[cold]
fn init() -> Result<(), Error> {
let ret = unsafe { libc::randSecure() };
match ret.cmp(&0) {
Greater => RNG_INIT.store(true, Relaxed),
Equal => unsafe {
libc::usleep(10);
},
Less => return Err(Error::VXWORKS_RAND_SECURE),
}
Ok(())
}
#[inline]
pub fn fill_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
while !RNG_INIT.load(Relaxed) {
init()?;
}
// Prevent overflow of i32
let chunk_size = usize::try_from(i32::MAX).expect("VxWorks does not support 16-bit targets");
for chunk in dest.chunks_mut(chunk_size) {
let chunk_len: libc::c_int = chunk
.len()
.try_into()
.expect("chunk size is bounded by i32::MAX");
let p: *mut libc::c_uchar = chunk.as_mut_ptr().cast();
let ret = unsafe { libc::randABytes(p, chunk_len) };
if ret != 0 {
return Err(util_libc::last_os_error());
}
}
Ok(())
}
impl Error {
/// On VxWorks, call to `randSecure` failed (random number generator is not yet initialized).
pub(crate) const VXWORKS_RAND_SECURE: Error = Self::new_internal(10);
}
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