read_exact() won’t work properly in non-blocking mode, they hit WouldBlock and start misbehaving.
My question: Is there any good replacement for this read_exact() implementation for non-blocking mode?
Here is the current implementation code in rustlib:
#[stable(feature = "read_exact", since = "1.6.0")]
fn read_exact(&mut self, mut buf: &mut [u8]) -> Result<()> {
while !buf.is_empty() {
match self.read(buf) {
Ok(0) => break,
Ok(n) => { let tmp = buf; buf = &mut tmp[n..]; }
Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
Err(e) => return Err(e),
}
}
if !buf.is_empty() {
Err(Error::new(ErrorKind::UnexpectedEof,
"failed to fill whole buffer"))
} else {
Ok(())
}
}