nc 0.9.7

Access system calls directly
Documentation 
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/// Sychronous I/O multiplexing.
pub unsafe fn __select50(
    nfds: i32,
    readfds: &mut fd_set_t,
    writefds: &mut fd_set_t,
    exceptfds: &mut fd_set_t,
    timeout: &mut timeval_t,
) -> Result<i32, Errno> {
    let nfds = nfds as usize;
    let readfds_ptr = readfds as *mut fd_set_t as usize;
    let writefds_ptr = writefds as *mut fd_set_t as usize;
    let exceptfds_ptr = exceptfds as *mut fd_set_t as usize;
    let timeout_ptr = timeout as *mut timeval_t as usize;
    syscall5(
        SYS___SELECT50,
        nfds,
        readfds_ptr,
        writefds_ptr,
        exceptfds_ptr,
        timeout_ptr,
    )
    .map(|ret| ret as i32)
}