1 /* $OpenBSD: pollnval.c,v 1.2 2021/10/29 20:15:03 bluhm Exp $ */ 2 3 /* 4 * Copyright (c) 2021 Leah Neukirchen <leah@vuxu.org> 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 #include <assert.h> 20 #include <stdio.h> 21 #include <poll.h> 22 #include <unistd.h> 23 24 int 25 main(void) 26 { 27 struct pollfd fds[1]; 28 29 /* Do not hang forever, abort with timeout. */ 30 alarm(10); 31 32 fds[0].fd = 0; 33 fds[0].events = POLLIN | POLLHUP; 34 close(0); 35 36 assert(poll(fds, 1, -1) == 1); 37 assert(fds[0].revents & POLLNVAL); 38 39 return 0; 40 } 41