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/* Basic tests for _Fork.
Copyright (C) 2021-2025 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
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <stdbool.h>
#include <support/check.h>
#include <support/xsignal.h>
#include <support/temp_file.h>
#include <support/xunistd.h>
#include <support/xthread.h>
/* For single-thread, _Fork behaves like fork. */
static int
singlethread_test (void)
{
const char testdata1[] = "abcdefghijklmnopqrtuvwxz";
enum { testdatalen1 = array_length (testdata1) };
const char testdata2[] = "01234567890";
enum { testdatalen2 = array_length (testdata2) };
pid_t ppid = getpid ();
int tempfd = create_temp_file ("tst-_Fork", NULL);
/* Check if the opened file is shared between process by read and write
some data on parent and child processes. */
xwrite (tempfd, testdata1, testdatalen1);
off_t off = xlseek (tempfd, 0, SEEK_CUR);
TEST_COMPARE (off, testdatalen1);
pid_t pid = _Fork ();
TEST_VERIFY_EXIT (pid != -1);
if (pid == 0)
{
TEST_VERIFY_EXIT (getpid () != ppid);
TEST_COMPARE (getppid(), ppid);
TEST_COMPARE (xlseek (tempfd, 0, SEEK_CUR), testdatalen1);
xlseek (tempfd, 0, SEEK_SET);
char buf[testdatalen1];
TEST_COMPARE (read (tempfd, buf, sizeof (buf)), testdatalen1);
TEST_COMPARE_BLOB (buf, testdatalen1, testdata1, testdatalen1);
xlseek (tempfd, 0, SEEK_SET);
xwrite (tempfd, testdata2, testdatalen2);
xclose (tempfd);
_exit (EXIT_SUCCESS);
}
int status;
xwaitpid (pid, &status, 0);
TEST_VERIFY (WIFEXITED (status));
TEST_COMPARE (WEXITSTATUS (status), EXIT_SUCCESS);
TEST_COMPARE (xlseek (tempfd, 0, SEEK_CUR), testdatalen2);
xlseek (tempfd, 0, SEEK_SET);
char buf[testdatalen2];
TEST_COMPARE (read (tempfd, buf, sizeof (buf)), testdatalen2);
TEST_COMPARE_BLOB (buf, testdatalen2, testdata2, testdatalen2);
return 0;
}
#define SIG_PID_EXIT_CODE 20
static bool atfork_prepare_var;
static bool atfork_parent_var;
static bool atfork_child_var;
static void
atfork_prepare (void)
{
atfork_prepare_var = true;
}
static void
atfork_parent (void)
{
atfork_parent_var = true;
}
static void
atfork_child (void)
{
atfork_child_var = true;
}
/* Different than fork, _Fork does not execute any pthread_atfork
handlers. */
static int
singlethread_atfork_test (void)
{
pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
singlethread_test ();
TEST_VERIFY (!atfork_prepare_var);
TEST_VERIFY (!atfork_parent_var);
TEST_VERIFY (!atfork_child_var);
return 0;
}
static void *
mt_atfork_test (void *args)
{
singlethread_atfork_test ();
return NULL;
}
static int
multithread_atfork_test (void)
{
pthread_t thr = xpthread_create (NULL, mt_atfork_test, NULL);
xpthread_join (thr);
return 0;
}
static int
do_test (void)
{
singlethread_atfork_test ();
multithread_atfork_test ();
return 0;
}
#include <support/test-driver.c>
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