nc 0.9.7

Access system calls directly
Documentation 
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/// Send message to a message queue.
pub unsafe fn __mq_timedsend50(
    mqdes: mqd_t,
    msg: &[u8],
    msg_len: usize,
    msg_prio: u32,
    abs_timeout: &timespec_t,
) -> Result<(), Errno> {
    let mqdes = mqdes as usize;
    let msg = CString::new(msg);
    let msg_ptr = msg.as_ptr() as usize;
    let msg_prio = msg_prio as usize;
    let abs_timeout_ptr = abs_timeout as *const timespec_t as usize;
    syscall5(
        SYS___MQ_TIMEDSEND50,
        mqdes,
        msg_ptr,
        msg_len,
        msg_prio,
        abs_timeout_ptr,
    )
    .map(drop)
}