Function ncdirect_inputready_fd 

pub unsafe extern "C" fn ncdirect_inputready_fd(
    n: *mut ncdirect,
) -> c_int

Get a file descriptor suitable for input event poll()ing. When this descriptor becomes available, you can call ncdirect_get_nblock(), and input ought be ready. This file descriptor is not necessarily the file descriptor associated with stdin (but it might be!).