1/*	$OpenBSD: poll_regevent.c,v 1.1 2021/11/29 16:11:46 visa Exp $	*/
2
3/*
4 * Copyright (c) 2021 Visa Hankala
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19/*
20 * Test that poll/select does not block if a pending event is found
21 * during registering.
22 */
23
24#include <assert.h>
25#include <err.h>
26#include <poll.h>
27#include <unistd.h>
28
29int
30main(void)
31{
32	struct pollfd pfd[2];
33	int p1[2];
34	int p2[2];
35	int ret;
36
37	/* Enforce test timeout. */
38	alarm(10);
39
40	if (pipe(p1) == -1)
41		err(1, "pipe");
42	if (pipe(p2) == -1)
43		err(1, "pipe");
44
45	close(p2[0]);
46
47	/* fd without event */
48	pfd[0].fd = p1[0];
49	pfd[0].events = POLLIN;
50
51	/* fd with event */
52	pfd[1].fd = p2[1];
53	pfd[1].events = POLLOUT;
54
55	ret = poll(pfd, 2, INFTIM);
56	assert(ret == 1);
57	assert(pfd[0].revents == 0);
58	assert(pfd[1].revents != 0);
59
60	return 0;
61}
62