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
29 int
main(void)30 main(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