1 /* $OpenBSD: select_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 <sys/select.h>
25 #include <assert.h>
26 #include <err.h>
27 #include <unistd.h>
28
29 int
main(void)30 main(void)
31 {
32 fd_set rfd;
33 fd_set wfd;
34 int p1[2];
35 int p2[2];
36 int ret;
37
38 /* Enforce test timeout. */
39 alarm(10);
40
41 if (pipe(p1) == -1)
42 err(1, "pipe");
43 if (pipe(p2) == -1)
44 err(1, "pipe");
45
46 close(p2[0]);
47
48 /* fd without event */
49 FD_ZERO(&rfd);
50 FD_SET(p1[0], &rfd);
51
52 /* fd with event */
53 FD_ZERO(&wfd);
54 FD_SET(p2[1], &wfd);
55
56 assert(p1[0] < p2[1]);
57
58 ret = select(p2[1] + 1, &rfd, &wfd, NULL, NULL);
59 assert(ret == 1);
60 assert(FD_ISSET(p1[0], &rfd) == 0);
61 assert(FD_ISSET(p2[1], &wfd) != 0);
62
63 return 0;
64 }
65