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glibc/posix/tst-vfork1.c
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/* Test for vfork functions. | |
Copyright (C) 2004-2016 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" |