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149 lines
3.3 KiB
C
149 lines
3.3 KiB
C
/* Test for vfork functions.
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Copyright (C) 2004-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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/* This test relies on non-POSIX functionality since the child
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processes call write and getpid. */
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static int
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do_test (void)
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{
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int result = 0;
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int fd[2];
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if (pipe (fd) == -1)
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{
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puts ("pipe failed");
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return 1;
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}
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/* First vfork() without previous getpid(). */
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pid_t p1;
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if ((p1 = vfork ()) == 0)
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{
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pid_t p = getpid ();
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_exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
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}
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else if (p1 == -1)
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{
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puts ("1st vfork failed");
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result = 1;
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}
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pid_t p2 = 0;
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if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t))) != sizeof (pid_t))
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{
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puts ("1st read failed");
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result = 1;
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}
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int r;
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if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
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{
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puts ("1st waitpid failed");
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result = 1;
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}
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else if (r != 0)
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{
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puts ("write in 1st child failed");
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result = 1;
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}
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/* Main process' ID. */
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pid_t p0 = getpid ();
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/* vfork() again, but after a getpid() in the main process. */
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pid_t p3;
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if ((p3 = vfork ()) == 0)
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{
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pid_t p = getpid ();
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_exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p));
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}
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else if (p1 == -1)
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{
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puts ("2nd vfork failed");
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result = 1;
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}
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pid_t p4;
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if (TEMP_FAILURE_RETRY (read (fd[0], &p4, sizeof (pid_t))) != sizeof (pid_t))
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{
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puts ("2nd read failed");
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result = 1;
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}
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if (TEMP_FAILURE_RETRY (waitpid (p3, &r, 0)) != p3)
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{
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puts ("2nd waitpid failed");
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result = 1;
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}
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else if (r != 0)
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{
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puts ("write in 2nd child failed");
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result = 1;
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}
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/* And getpid in the main process again. */
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pid_t p5 = getpid ();
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/* Analysis of the results. */
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if (p0 != p5)
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{
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printf ("p0(%ld) != p5(%ld)\n", (long int) p0, (long int) p5);
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result = 1;
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}
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if (p0 == p1)
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{
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printf ("p0(%ld) == p1(%ld)\n", (long int) p0, (long int) p1);
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result = 1;
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}
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if (p1 != p2)
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{
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printf ("p1(%ld) != p2(%ld)\n", (long int) p1, (long int) p2);
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result = 1;
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}
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if (p0 == p3)
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{
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printf ("p0(%ld) == p3(%ld)\n", (long int) p0, (long int) p3);
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result = 1;
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}
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if (p3 != p4)
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{
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printf ("p3(%ld) != p4(%ld)\n", (long int) p3, (long int) p4);
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result = 1;
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}
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close (fd[0]);
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close (fd[1]);
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if (result == 0)
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puts ("All OK");
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return result;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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