Function getn

src/event/port.rs:157–168

(
    port: Fd,
    mut events: Buf,
    min_events: u32,
    timeout: Option<&Timespec>,
)

/// [illumos]: https://illumos.org/man/3C/port_getn
#[doc(alias = "port_getn")]
pub fn getn<Fd: AsFd, Buf: Buffer<Event>>(
    port: Fd,
    mut events: Buf,
    min_events: u32,
    timeout: Option<&Timespec>,
) -> io::Result<Buf::Output> {
    // SAFETY: `port_getn` behaves.
    let nevents =
        unsafe { syscalls::port_getn(port.as_fd(), events.parts_mut(), min_events, timeout)? };
    // SAFETY: `port_getn` behaves.
    unsafe { Ok(events.assume_init(nevents)) }
}

/// `port_getn(port, NULL, 0, NULL)`—Queries the number of events
/// available from a port.