/*
 * Check fault injection along with signal injection.
 *
 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "tests.h"
#include <signal.h>
#include <unistd.h>
#include <sys/stat.h>
#include <asm/unistd.h>

static struct stat before, after;

static void
handler(int sig)
{
	if (stat(".", &after))
		syscall(__NR_exit_group, 2);

	if (before.st_dev != after.st_dev || before.st_ino != after.st_ino)
		syscall(__NR_exit_group, 3);

	syscall(__NR_exit_group, 0);
}

int
main(void)
{
	const struct sigaction act = { .sa_handler = handler };
	if (sigaction(SIGUSR1, &act, NULL))
		perror_msg_and_fail("sigaction");

	sigset_t mask;
	sigemptyset(&mask);
	sigaddset(&mask, SIGUSR1);
	if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
		perror_msg_and_fail("sigprocmask");

	if (stat(".", &before))
		perror_msg_and_fail("stat");

	syscall(__NR_chdir, ".");
	syscall(__NR_exit_group, 1);
	return 1;
}