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use nix::{
errno::Errno,
poll::{PollFlags, poll, PollFd},
unistd::{write, pipe}
};
macro_rules! loop_while_eintr {
($poll_expr: expr) => {
loop {
match $poll_expr {
Ok(nfds) => break nfds,
Err(Errno::EINTR) => (),
Err(e) => panic!("{}", e)
}
}
}
}
#[test]
fn test_poll() {
let (r, w) = pipe().unwrap();
let mut fds = [PollFd::new(r, PollFlags::POLLIN)];
// Poll an idle pipe. Should timeout
let nfds = loop_while_eintr!(poll(&mut fds, 100));
assert_eq!(nfds, 0);
assert!(!fds[0].revents().unwrap().contains(PollFlags::POLLIN));
write(w, b".").unwrap();
// Poll a readable pipe. Should return an event.
let nfds = poll(&mut fds, 100).unwrap();
assert_eq!(nfds, 1);
assert!(fds[0].revents().unwrap().contains(PollFlags::POLLIN));
}
// ppoll(2) is the same as poll except for how it handles timeouts and signals.
// Repeating the test for poll(2) should be sufficient to check that our
// bindings are correct.
#[cfg(any(target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "linux"))]
#[test]
fn test_ppoll() {
use nix::poll::ppoll;
use nix::sys::signal::SigSet;
use nix::sys::time::{TimeSpec, TimeValLike};
let timeout = TimeSpec::milliseconds(1);
let (r, w) = pipe().unwrap();
let mut fds = [PollFd::new(r, PollFlags::POLLIN)];
// Poll an idle pipe. Should timeout
let sigset = SigSet::empty();
let nfds = loop_while_eintr!(ppoll(&mut fds, Some(timeout), sigset));
assert_eq!(nfds, 0);
assert!(!fds[0].revents().unwrap().contains(PollFlags::POLLIN));
write(w, b".").unwrap();
// Poll a readable pipe. Should return an event.
let nfds = ppoll(&mut fds, Some(timeout), SigSet::empty()).unwrap();
assert_eq!(nfds, 1);
assert!(fds[0].revents().unwrap().contains(PollFlags::POLLIN));
}
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