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