nc 0.9.8

Access system calls directly
Documentation 
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/// Sychronous I/O multiplexing.
///
/// Most architectures can't handle 7-argument syscalls. So we provide a
/// 6-argument version where the sixth argument is a pointer to a structure
/// which has a pointer to the `sigset_t` itself followed by a `size_t` containing
/// the sigset size.
pub unsafe fn pselect6(
    nfds: i32,
    readfds: &mut fd_set_t,
    writefds: &mut fd_set_t,
    exceptfds: &mut fd_set_t,
    timeout: &timespec_t,
    sigmask: &sigset_t,
) -> Result<i32, Errno> {
    let nfds = nfds as usize;
    let readfds_ptr = core::ptr::from_mut(readfds) as usize;
    let writefds_ptr = core::ptr::from_mut(writefds) as usize;
    let exceptfds_ptr = core::ptr::from_mut(exceptfds) as usize;
    let timeout_ptr = core::ptr::from_ref(timeout) as usize;
    let sigmask_ptr = core::ptr::from_ref(sigmask) as usize;
    unsafe {
        syscall6(
            SYS___PSELECT50,
            nfds,
            readfds_ptr,
            writefds_ptr,
            exceptfds_ptr,
            timeout_ptr,
            sigmask_ptr,
        )
        .map(|ret| ret as i32)
    }
}