1 /* $OpenBSD: fork.c,v 1.4 2003/07/31 21:48:04 deraadt Exp $ */ 2 /* 3 * Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors, 4 * proven@mit.edu All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Chris Provenzano, 17 * the University of California, Berkeley, and contributors. 18 * 4. Neither the name of Chris Provenzano, the University, nor the names of 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO, THE REGENTS OR 26 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 /* 36 * Copyright (c) 1994 by Chris Provenzano, proven@athena.mit.edu 37 * 38 * Test the fork system call. 39 */ 40 41 #include <pthread.h> 42 #include <pthread_np.h> 43 #include <stdio.h> 44 #include <fcntl.h> 45 #include <sys/types.h> 46 #include <unistd.h> 47 #include <stdlib.h> 48 #include <signal.h> 49 #include <sys/wait.h> 50 #include "test.h" 51 52 53 static void * 54 empty(void *arg) 55 { 56 57 return (void *)0x12345678; 58 } 59 60 static void * 61 sleeper(void *arg) 62 { 63 64 pthread_set_name_np(pthread_self(), "slpr"); 65 sleep(10); 66 PANIC("sleeper timed out"); 67 } 68 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int flags; 74 pthread_t sleeper_thread; 75 void *result; 76 int status; 77 pid_t parent_pid; 78 pid_t child_pid; 79 80 parent_pid = getpid(); 81 82 CHECKe(flags = fcntl(STDOUT_FILENO, F_GETFL)); 83 if ((flags & (O_NONBLOCK | O_NDELAY))) { 84 /* This fails when stdout is /dev/null!? */ 85 /*CHECKe*/(fcntl(STDOUT_FILENO, F_SETFL, 86 flags & ~(O_NONBLOCK | O_NDELAY))); 87 } 88 89 CHECKr(pthread_create(&sleeper_thread, NULL, sleeper, NULL)); 90 sleep(1); 91 92 printf("forking from pid %d\n", getpid()); 93 94 CHECKe(child_pid = fork()); 95 if (child_pid == 0) { 96 /* child: */ 97 printf("child = pid %d\n", getpid()); 98 /* Our pid should change */ 99 ASSERT(getpid() != parent_pid); 100 /* Our sleeper thread should have disappeared */ 101 printf("sleeper should have disappeared\n"); 102 103 /* 104 * The following is bogus. The sleeper thread was 105 * freed before the fork returned. Calling pthread_join 106 * dereferences the 'sleeper_thread' pointer which no 107 * longer points to a valid thread structure. If the 108 * function returns ESRCH it's only because the freed 109 * memory hasn't been reused yet. 110 ASSERT(ESRCH == pthread_join(sleeper_thread, &result)); 111 printf("sleeper disappeared correctly\n"); 112 */ 113 114 /* Test starting another thread */ 115 CHECKr(pthread_create(&sleeper_thread, NULL, empty, NULL)); 116 sleep(1); 117 CHECKr(pthread_join(sleeper_thread, &result)); 118 ASSERT(result == (void *)0x12345678); 119 printf("child ok\n"); 120 _exit(0); 121 PANIC("child _exit"); 122 } 123 124 /* parent: */ 125 printf("parent = pid %d\n", getpid()); 126 /* Our pid should stay the same */ 127 ASSERT(getpid() == parent_pid); 128 /* wait for the child */ 129 ASSERTe(wait(&status), == child_pid); 130 /* the child should have called exit(0) */ 131 ASSERT(WIFEXITED(status)); 132 ASSERT(WEXITSTATUS(status) == 0); 133 /* Our sleeper thread should still be around */ 134 CHECKr(pthread_detach(sleeper_thread)); 135 printf("parent ok\n"); 136 SUCCEED; 137 } 138