1/* Thread with running thread calls exec.
2 Copyright (C) 2002-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <paths.h>
21#include <pthread.h>
22#include <signal.h>
23#include <spawn.h>
24#include <stdbool.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <unistd.h>
28#include <sys/wait.h>
29#include <support/xsignal.h>
30
31
32static void *
33tf (void *arg)
34{
35 pthread_t th = (pthread_t) arg;
36
37 if (pthread_join (th: th, NULL) == 0)
38 {
39 puts (s: "thread in parent joined!?");
40 exit (1);
41 }
42
43 puts (s: "join in thread in parent returned!?");
44 exit (1);
45}
46
47
48static int
49do_test (void)
50{
51 int fd[2];
52 if (pipe (pipedes: fd) != 0)
53 {
54 puts (s: "pipe failed");
55 exit (1);
56 }
57
58 /* Not interested in knowing when the pipe is closed. */
59 xsignal (SIGPIPE, SIG_IGN);
60
61 pid_t pid = fork ();
62 if (pid == -1)
63 {
64 puts (s: "fork failed");
65 exit (1);
66 }
67
68 if (pid == 0)
69 {
70 /* Use the fd for stdout. This is kind of ugly because it
71 substitutes the fd of stdout but we know what we are doing
72 here... */
73 if (dup2 (fd: fd[1], STDOUT_FILENO) != STDOUT_FILENO)
74 {
75 puts (s: "dup2 failed");
76 exit (1);
77 }
78
79 close (fd: fd[0]);
80
81 pthread_t th;
82 if (pthread_create (newthread: &th, NULL, start_routine: tf, arg: (void *) pthread_self ()) != 0)
83 {
84 puts (s: "create failed");
85 exit (1);
86 }
87
88 execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
89
90 puts (s: "execl failed");
91 exit (1);
92 }
93
94 close (fd: fd[1]);
95
96 char buf[200];
97 ssize_t n;
98 bool seen_pid = false;
99 while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
100 {
101 /* We only expect to read the PID. */
102 char *endp;
103 long int rpid = strtol (buf, &endp, 10);
104
105 if (*endp != '\n')
106 {
107 printf (format: "didn't parse whole line: \"%s\"\n", buf);
108 exit (1);
109 }
110 if (endp == buf)
111 {
112 puts (s: "read empty line");
113 exit (1);
114 }
115
116 if (rpid != pid)
117 {
118 printf (format: "found \"%s\", expected PID %ld\n", buf, (long int) pid);
119 exit (1);
120 }
121
122 if (seen_pid)
123 {
124 puts (s: "found more than one PID line");
125 exit (1);
126 }
127 seen_pid = true;
128 }
129
130 close (fd: fd[0]);
131
132 int status;
133 int err = waitpid (pid: pid, stat_loc: &status, options: 0);
134 if (err != pid)
135 {
136 puts (s: "waitpid failed");
137 exit (1);
138 }
139
140 if (!seen_pid)
141 {
142 puts (s: "didn't get PID");
143 exit (1);
144 }
145
146 return 0;
147}
148
149#define TEST_FUNCTION do_test ()
150#include "../test-skeleton.c"
151

source code of glibc/sysdeps/pthread/tst-exec2.c