1/* Copyright (C) 2002-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <pthread.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <unistd.h>
23#include <sys/wait.h>
24
25
26static pid_t initial_pid;
27
28
29static void *
30tf (void *arg)
31{
32 if (getppid () != initial_pid)
33 {
34 printf (format: "getppid in thread returned %ld, expected %ld\n",
35 (long int) getppid (), (long int) initial_pid);
36 return (void *) -1;
37 }
38
39 return NULL;
40}
41
42
43int
44main (void)
45{
46 initial_pid = getpid ();
47
48 pid_t child = fork ();
49 if (child == 0)
50 {
51 if (getppid () != initial_pid)
52 {
53 printf (format: "first getppid returned %ld, expected %ld\n",
54 (long int) getppid (), (long int) initial_pid);
55 exit (1);
56 }
57
58 pthread_t th;
59 if (pthread_create (newthread: &th, NULL, start_routine: tf, NULL) != 0)
60 {
61 puts (s: "pthread_create failed");
62 exit (1);
63 }
64
65 void *result;
66 if (pthread_join (th: th, thread_return: &result) != 0)
67 {
68 puts (s: "pthread_join failed");
69 exit (1);
70 }
71
72 exit (result == NULL ? 0 : 1);
73 }
74 else if (child == -1)
75 {
76 puts (s: "initial fork failed");
77 return 1;
78 }
79
80 int status;
81 if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
82 {
83 printf (format: "waitpid failed: %m\n");
84 return 1;
85 }
86
87 return status;
88}
89

source code of glibc/sysdeps/pthread/tst-fork2.c