nix/test/sys/test_select.rs

use nix::sys::select::*;
use nix::sys::signal::SigSet;
use nix::sys::time::{TimeSpec, TimeValLike};
use nix::unistd::{pipe, write};
use std::os::unix::io::{AsRawFd, BorrowedFd, FromRawFd, OwnedFd};

#[test]
pub fn test_pselect() {
    let _mtx = crate::SIGNAL_MTX.lock();

    let (r1, w1) = pipe().unwrap();
    write(w1, b"hi!").unwrap();
    let r1 = unsafe { OwnedFd::from_raw_fd(r1) };
    let (r2, _w2) = pipe().unwrap();
    let r2 = unsafe { OwnedFd::from_raw_fd(r2) };

    let mut fd_set = FdSet::new();
    fd_set.insert(&r1);
    fd_set.insert(&r2);

    let timeout = TimeSpec::seconds(10);
    let sigmask = SigSet::empty();
    assert_eq!(
        1,
        pselect(None, &mut fd_set, None, None, &timeout, &sigmask).unwrap()
    );
    assert!(fd_set.contains(&r1));
    assert!(!fd_set.contains(&r2));
}

#[test]
pub fn test_pselect_nfds2() {
    let (r1, w1) = pipe().unwrap();
    write(w1, b"hi!").unwrap();
    let r1 = unsafe { OwnedFd::from_raw_fd(r1) };
    let (r2, _w2) = pipe().unwrap();
    let r2 = unsafe { OwnedFd::from_raw_fd(r2) };

    let mut fd_set = FdSet::new();
    fd_set.insert(&r1);
    fd_set.insert(&r2);

    let timeout = TimeSpec::seconds(10);
    assert_eq!(
        1,
        pselect(
            std::cmp::max(r1.as_raw_fd(), r2.as_raw_fd()) + 1,
            &mut fd_set,
            None,
            None,
            &timeout,
            None
        )
        .unwrap()
    );
    assert!(fd_set.contains(&r1));
    assert!(!fd_set.contains(&r2));
}

macro_rules! generate_fdset_bad_fd_tests {
    ($fd:expr, $($method:ident),* $(,)?) => {
        $(
            #[test]
            #[should_panic]
            fn $method() {
                let bad_fd = unsafe{BorrowedFd::borrow_raw($fd)};
                FdSet::new().$method(&bad_fd);
            }
        )*
    }
}

mod test_fdset_too_large_fd {
    use super::*;
    use std::convert::TryInto;
    generate_fdset_bad_fd_tests!(
        FD_SETSIZE.try_into().unwrap(),
        insert,
        remove,
        contains,
    );
}