1/* 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 execl (_PATH_BSHELL, _PATH_BSHELL, "-c", "echo $$", NULL);
36
37 puts (s: "execl failed");
38 exit (1);
39}
40
41
42static int
43do_test (void)
44{
45 int fd[2];
46 if (pipe (pipedes: fd) != 0)
47 {
48 puts (s: "pipe failed");
49 exit (1);
50 }
51
52 /* Not interested in knowing when the pipe is closed. */
53 xsignal (SIGPIPE, SIG_IGN);
54
55 pid_t pid = fork ();
56 if (pid == -1)
57 {
58 puts (s: "fork failed");
59 exit (1);
60 }
61
62 if (pid == 0)
63 {
64 /* Use the fd for stdout. This is kind of ugly because it
65 substitutes the fd of stdout but we know what we are doing
66 here... */
67 if (dup2 (fd: fd[1], STDOUT_FILENO) != STDOUT_FILENO)
68 {
69 puts (s: "dup2 failed");
70 exit (1);
71 }
72
73 close (fd: fd[0]);
74
75 pthread_t th;
76 if (pthread_create (newthread: &th, NULL, start_routine: tf, NULL) != 0)
77 {
78 puts (s: "create failed");
79 exit (1);
80 }
81
82 if (pthread_join (th: th, NULL) == 0)
83 {
84 puts (s: "join succeeded!?");
85 exit (1);
86 }
87
88 puts (s: "join returned!?");
89 exit (1);
90 }
91
92 close (fd: fd[1]);
93
94 char buf[200];
95 ssize_t n;
96 bool seen_pid = false;
97 while (TEMP_FAILURE_RETRY ((n = read (fd[0], buf, sizeof (buf)))) > 0)
98 {
99 /* We only expect to read the PID. */
100 char *endp;
101 long int rpid = strtol (buf, &endp, 10);
102
103 if (*endp != '\n')
104 {
105 printf (format: "didn't parse whole line: \"%s\"\n", buf);
106 exit (1);
107 }
108 if (endp == buf)
109 {
110 puts (s: "read empty line");
111 exit (1);
112 }
113
114 if (rpid != pid)
115 {
116 printf (format: "found \"%s\", expected PID %ld\n", buf, (long int) pid);
117 exit (1);
118 }
119
120 if (seen_pid)
121 {
122 puts (s: "found more than one PID line");
123 exit (1);
124 }
125 seen_pid = true;
126 }
127
128 close (fd: fd[0]);
129
130 int status;
131 int err = waitpid (pid: pid, stat_loc: &status, options: 0);
132 if (err != pid)
133 {
134 puts (s: "waitpid failed");
135 exit (1);
136 }
137
138 if (!seen_pid)
139 {
140 puts (s: "didn't get PID");
141 exit (1);
142 }
143
144 return 0;
145}
146
147#define TEST_FUNCTION do_test ()
148#include "../test-skeleton.c"
149

source code of glibc/sysdeps/pthread/tst-exec3.c