Function kevent

src/event/kqueue.rs:448–466

`kevent(kqueue, changelist, eventlist, timeout)`—Wait for events on a `kqueue`. This is a wrapper around [`kevent_timespec`] which takes a `Duration` instead of a `Timespec` for the timemout value. `Timespec` has a signed `i64` seconds field; if converting `Duration` to `Timespec` overflows, `None` is passed as the timeout instead, such such a large timeout would be effectively infinite in practi

(
    kqueue: Fd,
    changelist: &[Event],
    eventlist: Buf,
    timeout: Option<Duration>,
)

/// The file descriptors referred to by the `Event` structs must be valid for
/// the lifetime of the `kqueue` file descriptor.
pub unsafe fn kevent<Fd: AsFd, Buf: Buffer<Event>>(
    kqueue: Fd,
    changelist: &[Event],
    eventlist: Buf,
    timeout: Option<Duration>,
) -> io::Result<Buf::Output> {
    let timeout = match timeout {
        Some(timeout) => match timeout.as_secs().try_into() {
            Ok(tv_sec) => Some(Timespec {
                tv_sec,
                tv_nsec: timeout.subsec_nanos() as _,
            }),
            Err(_) => None,
        },
        None => None,
    };

    kevent_timespec(kqueue, changelist, eventlist, timeout.as_ref())
}