Function select

app/redis-6.2.6/src/anet_ff.c:396–413

}

int
select(int nfds, fd_set *readfds, fd_set *writefds,
    fd_set *exceptfds, struct timeval *timeout)
{
    if (unlikely(inited == 0)) {
        INIT_FUNCTION(select);
        return real_select(nfds, readfds, writefds, exceptfds, timeout);
    }

    if (ff_fdisused(nfds)) {
        struct timeval tv;
        tv.tv_sec = 0;
        tv.tv_usec = 0;
        return ff_select(nfds, readfds, writefds, exceptfds, &tv);
    } else {
        return real_select(nfds, readfds, writefds, exceptfds, timeout);
    }
}

#pragma GCC diagnostic pop