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Solaris: Do not read from errno when libc did not indicate error. #448

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Jun 2, 2024
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Solaris: Do not read from errno when libc did not indicate error. #448

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9 changes: 4 additions & 5 deletions src/solaris.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,12 +22,11 @@ pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
let ptr = chunk.as_mut_ptr().cast::<c_void>();
let ret = unsafe { libc::getrandom(ptr, chunk.len(), libc::GRND_RANDOM) };
// In case the man page has a typo, we also check for negative ret.
if ret <= 0 {
return Err(last_os_error());
}
// If getrandom(2) succeeds, it should have completely filled chunk.
if (ret as usize) != chunk.len() {
return Err(Error::UNEXPECTED);
match usize::try_from(ret) {
Ok(ret) if ret == chunk.len() => {} // Good. Keep going.
Ok(0) => return Err(last_os_error()), // The syscall failed.
_ => return Err(Error::UNEXPECTED),
}
}
Ok(())
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