| /* Test for vfork functions. |
| Copyright (C) 2004-2018 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 <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <unistd.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| int raise_fail; |
| |
| static void |
| alrm (int sig) |
| { |
| if (raise (SIGUSR1) < 0) |
| raise_fail = 1; |
| } |
| |
| /* This test relies on non-POSIX functionality since the child |
| processes call write, nanosleep and getpid. */ |
| static int |
| do_test (void) |
| { |
| int result = 0; |
| int fd[2]; |
| |
| signal (SIGUSR1, SIG_IGN); |
| |
| struct sigaction sa; |
| sa.sa_handler = alrm; |
| sigemptyset (&sa.sa_mask); |
| sa.sa_flags = 0; |
| if (sigaction (SIGALRM, &sa, NULL) < 0) |
| { |
| puts ("couldn't set up SIGALRM handler"); |
| return 1; |
| } |
| |
| if (pipe (fd) == -1) |
| { |
| puts ("pipe failed"); |
| return 1; |
| } |
| |
| struct itimerval it; |
| it.it_value.tv_sec = 0; |
| it.it_value.tv_usec = 200 * 1000; |
| it.it_interval = it.it_value; |
| if (setitimer (ITIMER_REAL, &it, NULL) < 0) |
| { |
| puts ("couldn't set up timer"); |
| return 1; |
| } |
| |
| /* First vfork() without previous getpid(). */ |
| pid_t p1; |
| if ((p1 = vfork ()) == 0) |
| { |
| pid_t p = getpid (); |
| |
| struct timespec ts; |
| ts.tv_sec = 1; |
| ts.tv_nsec = 0; |
| TEMP_FAILURE_RETRY (nanosleep (&ts, &ts)); |
| _exit (TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p))) != sizeof (p)); |
| } |
| else if (p1 == -1) |
| { |
| puts ("1st vfork failed"); |
| result = 1; |
| } |
| |
| memset (&it, 0, sizeof (it)); |
| setitimer (ITIMER_REAL, &it, NULL); |
| |
| 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 (raise_fail) |
| { |
| puts ("raise failed"); |
| result = 1; |
| } |
| |
| if (result == 0) |
| puts ("All OK"); |
| |
| return result; |
| } |
| |
| #define TEST_FUNCTION do_test () |
| #include "../test-skeleton.c" |