Function select

#[unsafe(no_mangle)]
pub unsafe extern "C" fn select(
    nfds: c_int,
    readfds: *mut fd_set,
    writefds: *mut fd_set,
    exceptfds: *mut fd_set,
    timeout: *mut timeval,
) -> c_int

Available on (crate features select or epoll) and crate feature select only.

Monitor multiple file descriptors, waiting until one or more of the file descriptors become “ready” for some class of I/O operation