1 /* Test for vfork functions.
2 Copyright (C) 2004-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
27 #include <sys/types.h>
35 if (raise (SIGUSR1) < 0)
39 /* This test relies on non-POSIX functionality since the child
40 processes call write, nanosleep and getpid. */
47 signal (SIGUSR1, SIG_IGN);
51 sigemptyset (&sa.sa_mask);
53 if (sigaction (SIGALRM, &sa, NULL) < 0)
55 puts ("couldn't set up SIGALRM handler");
66 it.it_value.tv_sec = 0;
67 it.it_value.tv_usec = 200 * 1000;
68 it.it_interval = it.it_value;
69 if (setitimer (ITIMER_REAL, &it, NULL) < 0)
71 puts ("couldn't set up timer");
75 /* First vfork() without previous getpid(). */
77 if ((p1 = vfork ()) == 0)
84 TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
85 _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
89 puts ("1st vfork failed");
93 memset (&it, 0, sizeof (it));
94 setitimer (ITIMER_REAL, &it, NULL);
97 if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t))) != sizeof (pid_t))
99 puts ("1st read failed");
103 if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
105 puts ("1st waitpid failed");
110 puts ("write in 1st child failed");
114 /* Main process' ID. */
115 pid_t p0 = getpid ();
117 /* vfork() again, but after a getpid() in the main process. */
119 if ((p3 = vfork ()) == 0)
122 _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
126 puts ("2nd vfork failed");
131 if (TEMP_FAILURE_RETRY (read (fd[0], &p4, sizeof (pid_t))) != sizeof (pid_t))
133 puts ("2nd read failed");
136 if (TEMP_FAILURE_RETRY (waitpid (p3, &r, 0)) != p3)
138 puts ("2nd waitpid failed");
143 puts ("write in 2nd child failed");
147 /* And getpid in the main process again. */
148 pid_t p5 = getpid ();
150 /* Analysis of the results. */
153 printf ("p0(%ld) != p5(%ld)\n", (long int) p0, (long int) p5);
159 printf ("p0(%ld) == p1(%ld)\n", (long int) p0, (long int) p1);
165 printf ("p1(%ld) != p2(%ld)\n", (long int) p1, (long int) p2);
171 printf ("p0(%ld) == p3(%ld)\n", (long int) p0, (long int) p3);
177 printf ("p3(%ld) != p4(%ld)\n", (long int) p3, (long int) p4);
186 puts ("raise failed");
196 #define TEST_FUNCTION do_test ()
197 #include "../test-skeleton.c"