1/*-
2 * Copyright (c) 2014 Mark Johnston <markj@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <err.h>
31#include <signal.h>
32#include <stdlib.h>
33#include <string.h>
34#include <unistd.h>
35
36static volatile sig_atomic_t saw;
37
38static void
39usr1(int sig __unused)
40{
41
42	saw = 1;
43}
44
45int
46main(int argc, char **argv)
47{
48
49	if (argc == 1)
50		return (EXIT_SUCCESS);
51	if (argc == 2 && strcmp(argv[1], "-s") == 0) {
52		if (signal(SIGUSR1, usr1) == SIG_ERR)
53			err(1, "signal");
54		if (kill(getpid(), SIGUSR1) != 0)
55			err(1, "kill");
56		return (saw == 1 ? EXIT_SUCCESS : EXIT_FAILURE);
57	}
58	return (EXIT_FAILURE);
59}
60