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