1 /* $OpenBSD: fork.c,v 1.1.1.1 2001/08/15 14:37:11 fgsch 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 <signal.h> 48 #include <sys/wait.h> 49 #include "test.h" 50 51 52 void * 53 empty(void *arg) 54 { 55 56 return (void *)0x12345678; 57 } 58 59 void * 60 sleeper(void *arg) 61 { 62 63 pthread_set_name_np(pthread_self(), "slpr"); 64 sleep(10); 65 PANIC("sleeper timed out"); 66 } 67 68 69 int 70 main() 71 { 72 int flags; 73 pthread_t sleeper_thread; 74 void *result; 75 int status; 76 pid_t parent_pid; 77 pid_t child_pid; 78 79 parent_pid = getpid(); 80 81 CHECKe(flags = fcntl(STDOUT_FILENO, F_GETFL)); 82 if ((flags & (O_NONBLOCK | O_NDELAY))) { 83 /* This fails when stdout is /dev/null!? */ 84 /*CHECKe*/(fcntl(STDOUT_FILENO, F_SETFL, 85 flags & ~(O_NONBLOCK | O_NDELAY))); 86 } 87 88 CHECKr(pthread_create(&sleeper_thread, NULL, sleeper, NULL)); 89 sleep(1); 90 91 printf("forking from pid %d\n", getpid()); 92 93 CHECKe(child_pid = fork()); 94 if (child_pid == 0) { 95 /* child: */ 96 printf("child = pid %d\n", getpid()); 97 /* Our pid should change */ 98 ASSERT(getpid() != parent_pid); 99 /* Our sleeper thread should have disappeared */ 100 printf("sleeper should have disappeared\n"); 101 ASSERT(ESRCH == pthread_join(sleeper_thread, &result)); 102 printf("sleeper disappeared correctly\n"); 103 /* Test starting another thread */ 104 CHECKr(pthread_create(&sleeper_thread, NULL, empty, NULL)); 105 sleep(1); 106 CHECKr(pthread_join(sleeper_thread, &result)); 107 ASSERT(result == (void *)0x12345678); 108 printf("child ok\n"); 109 _exit(0); 110 PANIC("child _exit"); 111 } 112 113 /* parent: */ 114 printf("parent = pid %d\n", getpid()); 115 /* Our pid should stay the same */ 116 ASSERT(getpid() == parent_pid); 117 /* wait for the child */ 118 ASSERTe(wait(&status), == child_pid); 119 /* the child should have called exit(0) */ 120 ASSERT(WIFEXITED(status)); 121 ASSERT(WEXITSTATUS(status) == 0); 122 /* Our sleeper thread should still be around */ 123 CHECKr(pthread_detach(sleeper_thread)); 124 printf("parent ok\n"); 125 SUCCEED; 126 } 127