1 /* $OpenBSD: fork.c,v 1.6 2017/07/29 17:36:59 bluhm 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 static void *
sleeper(void * arg)53 sleeper(void *arg)
54 {
55 pthread_set_name_np(pthread_self(), "slpr");
56 sleep(10);
57 PANIC("sleeper timed out");
58 }
59
60
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 int flags;
65 pthread_t sleeper_thread;
66 int status;
67 pid_t parent_pid;
68 pid_t child_pid;
69
70 parent_pid = getpid();
71
72 CHECKe(flags = fcntl(STDOUT_FILENO, F_GETFL));
73 if ((flags & (O_NONBLOCK | O_NDELAY))) {
74 /* This fails when stdout is /dev/null!? */
75 /*CHECKe*/(fcntl(STDOUT_FILENO, F_SETFL,
76 flags & ~(O_NONBLOCK | O_NDELAY)));
77 }
78
79 CHECKr(pthread_create(&sleeper_thread, NULL, sleeper, NULL));
80 sleep(1);
81
82 printf("forking from pid %d\n", getpid());
83
84 CHECKe(child_pid = fork());
85 if (child_pid == 0) {
86 /* child: */
87 printf("child = pid %d\n", getpid());
88 /* Our pid should change */
89 ASSERT(getpid() != parent_pid);
90 /* Our sleeper thread should have disappeared */
91 printf("sleeper should have disappeared\n");
92
93 printf("child ok\n");
94 _exit(0);
95 PANIC("child _exit");
96 }
97
98 /* parent: */
99 printf("parent = pid %d\n", getpid());
100 /* Our pid should stay the same */
101 ASSERT(getpid() == parent_pid);
102 /* wait for the child */
103 ASSERTe(wait(&status), == child_pid);
104 /* the child should have called exit(0) */
105 ASSERT(WIFEXITED(status));
106 ASSERT(WEXITSTATUS(status) == 0);
107 /* Our sleeper thread should still be around */
108 CHECKr(pthread_detach(sleeper_thread));
109 printf("parent ok\n");
110 SUCCEED;
111 }
112