1 /* ncmpc (Ncurses MPD Client)
2 * (c) 2004-2017 The Music Player Daemon Project
3 * Project homepage: http://musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
20 #include "signals.h"
21 #include "screen.h"
22 #include "Compiler.h"
24 #include <glib-unix.h>
26 #include <stdbool.h>
28 static int sigwinch_pipes[2];
30 static gboolean
31 handle_quit_signal(gpointer data)
32 {
33 GMainLoop *main_loop = data;
35 g_main_loop_quit(main_loop);
36 return false;
37 }
39 static gboolean
40 sigwinch_event(gcc_unused GIOChannel *source,
41 gcc_unused GIOCondition condition, gpointer data)
42 {
43 struct mpdclient *c = data;
45 char ignoreme[64];
46 if (1 > read(sigwinch_pipes[0], ignoreme, 64))
47 exit(EXIT_FAILURE);
49 endwin();
50 refresh();
51 screen_resize(c);
53 return TRUE;
54 }
56 static void
57 catch_sigwinch(gcc_unused int sig)
58 {
59 if (1 != write(sigwinch_pipes[1], "", 1))
60 exit(EXIT_FAILURE);
61 }
63 void
64 signals_init(GMainLoop *main_loop, struct mpdclient *c)
65 {
66 /* setup quit signals */
67 g_unix_signal_add(SIGTERM, handle_quit_signal, main_loop);
68 g_unix_signal_add(SIGINT, handle_quit_signal, main_loop);
69 g_unix_signal_add(SIGHUP, handle_quit_signal, main_loop);
71 /* setup signal behavior - SIGCONT */
73 struct sigaction act;
74 sigemptyset(&act.sa_mask);
75 act.sa_flags = 0;
77 act.sa_handler = catch_sigwinch;
78 if (sigaction(SIGCONT, &act, NULL) < 0) {
79 perror("sigaction(SIGCONT)");
80 exit(EXIT_FAILURE);
81 }
83 /* setup SIGWINCH */
85 act.sa_flags = SA_RESTART;
86 act.sa_handler = catch_sigwinch;
87 if (sigaction(SIGWINCH, &act, NULL) < 0) {
88 perror("sigaction(SIGWINCH)");
89 exit(EXIT_FAILURE);
90 }
92 #ifndef WIN32
93 if (!pipe(sigwinch_pipes) &&
94 !fcntl(sigwinch_pipes[1], F_SETFL, O_NONBLOCK)) {
95 GIOChannel *sigwinch_channel = g_io_channel_unix_new(sigwinch_pipes[0]);
96 g_io_add_watch(sigwinch_channel, G_IO_IN, sigwinch_event, c);
97 g_io_channel_unref(sigwinch_channel);
98 }
99 else {
100 perror("sigwinch pipe creation failed");
101 exit(EXIT_FAILURE);
102 }
103 #endif
105 /* ignore SIGPIPE */
107 act.sa_handler = SIG_IGN;
108 if (sigaction(SIGPIPE, &act, NULL) < 0) {
109 perror("sigaction(SIGPIPE)");
110 exit(EXIT_FAILURE);
111 }
112 }
114 void
115 signals_deinit(void)
116 {
117 close(sigwinch_pipes[0]);
118 close(sigwinch_pipes[1]);
119 }