4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
7 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
9 PulseAudio is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published
11 by the Free Software Foundation; either version 2 of the License,
12 or (at your option) any later version.
14 PulseAudio is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with PulseAudio; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
42 #include <pulsecore/core-error.h>
43 #include <pulse/xmalloc.h>
45 #include <pulsecore/core-util.h>
46 #include <pulsecore/log.h>
47 #include <pulsecore/gccmacro.h>
49 #include "mainloop-signal.h"
51 struct pa_signal_event {
54 struct sigaction saved_sigaction;
56 void (*saved_handler)(int sig);
58 void (*callback) (pa_mainloop_api*a, pa_signal_event *e, int sig, void *userdata);
60 void (*destroy_callback) (pa_mainloop_api*a, pa_signal_event*e, void *userdata);
61 pa_signal_event *previous, *next;
64 static pa_mainloop_api *api = NULL;
65 static int signal_pipe[2] = { -1, -1 };
66 static pa_io_event* io_event = NULL;
67 static pa_signal_event *signals = NULL;
69 static void signal_handler(int sig) {
70 #ifndef HAVE_SIGACTION
71 signal(sig, signal_handler);
73 pa_write(signal_pipe[1], &sig, sizeof(sig), NULL);
76 static void dispatch(pa_mainloop_api*a, int sig) {
79 for (s = signals; s; s = s->next)
82 s->callback(a, s, sig, s->userdata);
87 static void callback(pa_mainloop_api*a, pa_io_event*e, int fd, pa_io_event_flags_t f, PA_GCC_UNUSED void *userdata) {
90 assert(a && e && f == PA_IO_EVENT_INPUT && e == io_event && fd == signal_pipe[0]);
92 if ((r = pa_read(signal_pipe[0], &sig, sizeof(sig), NULL)) < 0) {
96 pa_log("read(): %s", pa_cstrerror(errno));
100 if (r != sizeof(sig)) {
101 pa_log("short read()");
108 int pa_signal_init(pa_mainloop_api *a) {
110 assert(!api && a && signal_pipe[0] == -1 && signal_pipe[1] == -1 && !io_event);
112 if (pipe(signal_pipe) < 0) {
113 pa_log("pipe(): %s", pa_cstrerror(errno));
117 pa_make_nonblock_fd(signal_pipe[0]);
118 pa_make_nonblock_fd(signal_pipe[1]);
119 pa_fd_set_cloexec(signal_pipe[0], 1);
120 pa_fd_set_cloexec(signal_pipe[1], 1);
124 io_event = api->io_new(api, signal_pipe[0], PA_IO_EVENT_INPUT, callback, NULL);
130 void pa_signal_done(void) {
131 assert(api && signal_pipe[0] >= 0 && signal_pipe[1] >= 0 && io_event);
134 pa_signal_free(signals);
136 api->io_free(io_event);
139 close(signal_pipe[0]);
140 close(signal_pipe[1]);
141 signal_pipe[0] = signal_pipe[1] = -1;
146 pa_signal_event* pa_signal_new(int sig, void (*_callback) (pa_mainloop_api *api, pa_signal_event*e, int sig, void *userdata), void *userdata) {
147 pa_signal_event *e = NULL;
149 #ifdef HAVE_SIGACTION
153 assert(sig > 0 && _callback);
155 for (e = signals; e; e = e->next)
159 e = pa_xmalloc(sizeof(pa_signal_event));
161 e->callback = _callback;
162 e->userdata = userdata;
163 e->destroy_callback = NULL;
165 #ifdef HAVE_SIGACTION
166 memset(&sa, 0, sizeof(sa));
167 sa.sa_handler = signal_handler;
168 sigemptyset(&sa.sa_mask);
169 sa.sa_flags = SA_RESTART;
171 if (sigaction(sig, &sa, &e->saved_sigaction) < 0)
173 if ((e->saved_handler = signal(sig, signal_handler)) == SIG_ERR)
188 void pa_signal_free(pa_signal_event *e) {
192 e->next->previous = e->previous;
194 e->previous->next = e->next;
198 #ifdef HAVE_SIGACTION
199 sigaction(e->sig, &e->saved_sigaction, NULL);
201 signal(e->sig, e->saved_handler);
204 if (e->destroy_callback)
205 e->destroy_callback(api, e, e->userdata);
210 void pa_signal_set_destroy(pa_signal_event *e, void (*_callback) (pa_mainloop_api *api, pa_signal_event*e, void *userdata)) {
212 e->destroy_callback = _callback;