1 /*
2  * Check fault injection along with signal injection.
3  *
4  * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include "tests.h"
31 #include <signal.h>
32 #include <unistd.h>
33 #include <sys/stat.h>
34 #include <asm/unistd.h>
35 
36 static struct stat before, after;
37 
38 static void
39 handler(int sig)
40 {
41 	if (stat(".", &after))
42 		syscall(__NR_exit_group, 2);
43 
44 	if (before.st_dev != after.st_dev || before.st_ino != after.st_ino)
45 		syscall(__NR_exit_group, 3);
46 
47 	syscall(__NR_exit_group, 0);
48 }
49 
50 int
51 main(void)
52 {
53 	const struct sigaction act = { .sa_handler = handler };
54 	if (sigaction(SIGUSR1, &act, NULL))
55 		perror_msg_and_fail("sigaction");
56 
57 	sigset_t mask;
58 	sigemptyset(&mask);
59 	sigaddset(&mask, SIGUSR1);
60 	if (sigprocmask(SIG_UNBLOCK, &mask, NULL))
61 		perror_msg_and_fail("sigprocmask");
62 
63 	if (stat(".", &before))
64 		perror_msg_and_fail("stat");
65 
66 	syscall(__NR_chdir, ".");
67 	syscall(__NR_exit_group, 1);
68 	return 1;
69 }
70