1 /* $NetBSD: dislodgefd.c,v 1.1 2023/10/13 18:46:22 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2023 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/socket.h> 30 #include <sys/un.h> 31 32 #include <pthread.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 #include <err.h> 38 39 pthread_barrier_t barrier; 40 int fds[2]; 41 42 static void * 43 reader(void *cookie) 44 { 45 char buf[1]; 46 47 (void)pthread_barrier_wait(&barrier); 48 printf("reader(): commencing read, this should error out... after 1s\n"); 49 if (read(fds[0], buf, sizeof(buf)) == -1) 50 err(1, "read"); 51 52 printf("reader(): read terminated without error??\n"); 53 return NULL; 54 } 55 56 int 57 main(int argc, char *argv[]) 58 { 59 pthread_t pt; 60 61 if (argc > 1 && strcmp(argv[1], "pipe") == 0) { 62 if (pipe(fds)) 63 err(1, "pipe"); 64 } else { 65 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, fds) < 0) 66 err(1, "socketpair"); 67 } 68 pthread_barrier_init(&barrier, NULL, 2); 69 if (pthread_create(&pt, NULL, reader, NULL)) { 70 errx(1, "pthread_create failed"); 71 } 72 (void)pthread_barrier_wait(&barrier); 73 sleep(1); 74 printf("main(): closing the reader side fd..\n"); 75 close(fds[0]); 76 printf("main(): sleeping again for a bit..\n"); 77 sleep(1); 78 printf("main(): exiting.\n"); 79 return 0; 80 } 81