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