1/* $Id: signal.c,v 1.1.1.2 2011/08/17 18:40:05 jmmv Exp $ */
2
3/*
4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5 * Copyright (c) 2010 Romain Francoise <rfrancoise@debian.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
16 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
17 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <string.h>
21#include <signal.h>
22
23#include "tmux.h"
24
25struct event	ev_sighup;
26struct event	ev_sigchld;
27struct event	ev_sigcont;
28struct event	ev_sigterm;
29struct event	ev_sigusr1;
30struct event	ev_sigwinch;
31
32void
33set_signals(void(*handler)(int, short, unused void *))
34{
35	struct sigaction	sigact;
36
37	memset(&sigact, 0, sizeof sigact);
38	sigemptyset(&sigact.sa_mask);
39	sigact.sa_flags = SA_RESTART;
40	sigact.sa_handler = SIG_IGN;
41	if (sigaction(SIGINT, &sigact, NULL) != 0)
42		fatal("sigaction failed");
43	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
44		fatal("sigaction failed");
45	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
46		fatal("sigaction failed");
47	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
48		fatal("sigaction failed");
49
50	signal_set(&ev_sighup, SIGHUP, handler, NULL);
51	signal_add(&ev_sighup, NULL);
52	signal_set(&ev_sigchld, SIGCHLD, handler, NULL);
53	signal_add(&ev_sigchld, NULL);
54	signal_set(&ev_sigcont, SIGCONT, handler, NULL);
55	signal_add(&ev_sigcont, NULL);
56	signal_set(&ev_sigterm, SIGTERM, handler, NULL);
57	signal_add(&ev_sigterm, NULL);
58	signal_set(&ev_sigusr1, SIGUSR1, handler, NULL);
59	signal_add(&ev_sigusr1, NULL);
60	signal_set(&ev_sigwinch, SIGWINCH, handler, NULL);
61	signal_add(&ev_sigwinch, NULL);
62}
63
64void
65clear_signals(int after_fork)
66{
67	struct sigaction	sigact;
68
69	memset(&sigact, 0, sizeof sigact);
70	sigemptyset(&sigact.sa_mask);
71	sigact.sa_flags = SA_RESTART;
72	sigact.sa_handler = SIG_DFL;
73	if (sigaction(SIGINT, &sigact, NULL) != 0)
74		fatal("sigaction failed");
75	if (sigaction(SIGPIPE, &sigact, NULL) != 0)
76		fatal("sigaction failed");
77	if (sigaction(SIGUSR2, &sigact, NULL) != 0)
78		fatal("sigaction failed");
79	if (sigaction(SIGTSTP, &sigact, NULL) != 0)
80		fatal("sigaction failed");
81
82	if (after_fork) {
83		if (sigaction(SIGHUP, &sigact, NULL) != 0)
84			fatal("sigaction failed");
85		if (sigaction(SIGCHLD, &sigact, NULL) != 0)
86			fatal("sigaction failed");
87		if (sigaction(SIGCONT, &sigact, NULL) != 0)
88			fatal("sigaction failed");
89		if (sigaction(SIGTERM, &sigact, NULL) != 0)
90			fatal("sigaction failed");
91		if (sigaction(SIGUSR1, &sigact, NULL) != 0)
92			fatal("sigaction failed");
93		if (sigaction(SIGWINCH, &sigact, NULL) != 0)
94			fatal("sigaction failed");
95	} else {
96		event_del(&ev_sighup);
97		event_del(&ev_sigchld);
98		event_del(&ev_sigcont);
99		event_del(&ev_sigterm);
100		event_del(&ev_sigusr1);
101		event_del(&ev_sigwinch);
102	}
103}
104