glibc/posix/tst-vfork1.c

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/* Test for vfork functions.
Copyright (C) 2004-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
Prefer https to http for gnu.org and fsf.org URLs Also, change sources.redhat.com to sourceware.org. This patch was automatically generated by running the following shell script, which uses GNU sed, and which avoids modifying files imported from upstream: sed -ri ' s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g ' \ $(find $(git ls-files) -prune -type f \ ! -name '*.po' \ ! -name 'ChangeLog*' \ ! -path COPYING ! -path COPYING.LIB \ ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \ ! -path manual/texinfo.tex ! -path scripts/config.guess \ ! -path scripts/config.sub ! -path scripts/install-sh \ ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \ ! -path INSTALL ! -path locale/programs/charmap-kw.h \ ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \ ! '(' -name configure \ -execdir test -f configure.ac -o -f configure.in ';' ')' \ ! '(' -name preconfigure \ -execdir test -f preconfigure.ac ';' ')' \ -print) and then by running 'make dist-prepare' to regenerate files built from the altered files, and then executing the following to cleanup: chmod a+x sysdeps/unix/sysv/linux/riscv/configure # Omit irrelevant whitespace and comment-only changes, # perhaps from a slightly-different Autoconf version. git checkout -f \ sysdeps/csky/configure \ sysdeps/hppa/configure \ sysdeps/riscv/configure \ sysdeps/unix/sysv/linux/csky/configure # Omit changes that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines git checkout -f \ sysdeps/powerpc/powerpc64/ppc-mcount.S \ sysdeps/unix/sysv/linux/s390/s390-64/syscall.S # Omit change that caused a pre-commit check to fail like this: # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
<https://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"