1 /*
2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.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 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <assert.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <signal.h>
32
handle_signal(int no)33 static void handle_signal(int no)
34 {
35 _exit(128 + no);
36 }
37
38 int
main(void)39 main(void)
40 {
41 struct sigaction sa, sa0;
42
43 sa.sa_handler = SIG_IGN;
44 sigemptyset(&sa.sa_mask);
45 sigaddset(&sa.sa_mask, SIGHUP);
46 sigaddset(&sa.sa_mask, SIGINT);
47 sa.sa_flags = SA_RESTART;
48 assert(!sigaction(SIGUSR2, &sa, &sa0));
49
50 sa.sa_handler = handle_signal;
51 sigemptyset(&sa.sa_mask);
52 sigaddset(&sa.sa_mask, SIGQUIT);
53 sigaddset(&sa.sa_mask, SIGTERM);
54 sa.sa_flags = SA_SIGINFO;
55 assert(!sigaction(SIGUSR2, &sa, &sa0));
56
57 sa.sa_handler = SIG_DFL;
58 sigemptyset(&sa.sa_mask);
59 sa.sa_flags = 0;
60 assert(!sigaction(SIGUSR2, &sa, &sa0));
61
62 sigfillset(&sa.sa_mask);
63 sigdelset(&sa.sa_mask, SIGHUP);
64 assert(!sigaction(SIGUSR2, &sa, &sa0));
65
66 return 0;
67 }
68