Function twz_rt_fd_select 

#[unsafe(no_mangle)]
pub unsafe extern "C-unwind" fn twz_rt_fd_select(
    nfds: usize,
    readfds: *mut fd_set,
    writefds: *mut fd_set,
    exceptfds: *mut fd_set,
    timeout: option_duration,
) -> io_result