Function getn 

pub fn getn<Fd: AsFd, Buf: Buffer<Event>>(
    port: Fd,
    events: Buf,
    min_events: u32,
    timeout: Option<&Timespec>,
) -> Result<Buf::Output>

Available on crate feature event and solarish only.

port_getn(port, events, min_events, timeout)—Gets multiple events from a port.

If events is empty, this does nothing and returns immediately.

To query the number of events without retrieving any, use getn_query.

If an unsupported timeout is passed, this function fails with io::Errno::INVAL.

References

• OpenSolaris
• illumos