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
|
/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Roland McGrath <roland@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
static pid_t initial_pid;
static void *
tf (void *arg)
{
if (getppid () != initial_pid)
{
printf ("getppid in thread returned %ld, expected %ld\n",
(long int) getppid (), (long int) initial_pid);
return (void *) -1;
}
return NULL;
}
int
main (void)
{
initial_pid = getpid ();
pid_t child = fork ();
if (child == 0)
{
if (getppid () != initial_pid)
{
printf ("first getppid returned %ld, expected %ld\n",
(long int) getppid (), (long int) initial_pid);
exit (1);
}
pthread_t th;
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("pthread_create failed");
exit (1);
}
void *result;
if (pthread_join (th, &result) != 0)
{
puts ("pthread_join failed");
exit (1);
}
exit (result == NULL ? 0 : 1);
}
else if (child == -1)
{
puts ("initial fork failed");
return 1;
}
int status;
if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
{
printf ("waitpid failed: %m\n");
return 1;
}
return status;
}
|
