/*      $OpenBSD: select_regevent.c,v 1.1 2021/11/29 16:11:46 visa Exp $        */

/*
 * Copyright (c) 2021 Visa Hankala
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Test that poll/select does not block if a pending event is found
 * during registering.
 */

#include <sys/select.h>
#include <assert.h>
#include <err.h>
#include <unistd.h>

int
main(void)
{
        fd_set rfd;
        fd_set wfd;
        int p1[2];
        int p2[2];
        int ret;

        /* Enforce test timeout. */
        alarm(10);

        if (pipe(p1) == -1)
                err(1, "pipe");
        if (pipe(p2) == -1)
                err(1, "pipe");

        close(p2[0]);

        /* fd without event */
        FD_ZERO(&rfd);
        FD_SET(p1[0], &rfd);

        /* fd with event */
        FD_ZERO(&wfd);
        FD_SET(p2[1], &wfd);

        assert(p1[0] < p2[1]);

        ret = select(p2[1] + 1, &rfd, &wfd, NULL, NULL);
        assert(ret == 1);
        assert(FD_ISSET(p1[0], &rfd) == 0);
        assert(FD_ISSET(p2[1], &wfd) != 0);

        return 0;
}