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
41 #include <pulse/xmalloc.h>
43 #include <pulsecore/core-error.h>
44 #include <pulsecore/core-util.h>
45 #include <pulsecore/log.h>
46 #include <pulsecore/gccmacro.h>
47 #include <pulsecore/macro.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)
81 pa_assert(s->callback);
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) {
93 pa_assert(f == PA_IO_EVENT_INPUT);
94 pa_assert(e == io_event);
95 pa_assert(fd == signal_pipe[0]);
97 if ((r = pa_read(signal_pipe[0], &sig, sizeof(sig), NULL)) < 0) {
101 pa_log("read(): %s", pa_cstrerror(errno));
105 if (r != sizeof(sig)) {
106 pa_log("short read()");
113 int pa_signal_init(pa_mainloop_api *a) {
117 pa_assert(signal_pipe[0] == -1);
118 pa_assert(signal_pipe[1] == -1);
119 pa_assert(!io_event);
121 if (pipe(signal_pipe) < 0) {
122 pa_log("pipe(): %s", pa_cstrerror(errno));
126 pa_make_nonblock_fd(signal_pipe[0]);
127 pa_make_nonblock_fd(signal_pipe[1]);
128 pa_assert_se(pa_fd_set_cloexec(signal_pipe[0], 1) == 0);
129 pa_assert_se(pa_fd_set_cloexec(signal_pipe[1], 1) == 0);
133 pa_assert_se(io_event = api->io_new(api, signal_pipe[0], PA_IO_EVENT_INPUT, callback, NULL));
138 void pa_signal_done(void) {
140 pa_assert(signal_pipe[0] >= 0);
141 pa_assert(signal_pipe[1] >= 0);
145 pa_signal_free(signals);
147 api->io_free(io_event);
150 pa_assert_se(close(signal_pipe[0]) == 0);
151 pa_assert_se(close(signal_pipe[1]) == 0);
152 signal_pipe[0] = signal_pipe[1] = -1;
157 pa_signal_event* pa_signal_new(int sig, void (*_callback) (pa_mainloop_api *api, pa_signal_event*e, int sig, void *userdata), void *userdata) {
158 pa_signal_event *e = NULL;
160 #ifdef HAVE_SIGACTION
164 pa_assert(sig > 0 && _callback);
166 for (e = signals; e; e = e->next)
170 e = pa_xnew(pa_signal_event, 1);
172 e->callback = _callback;
173 e->userdata = userdata;
174 e->destroy_callback = NULL;
176 #ifdef HAVE_SIGACTION
177 memset(&sa, 0, sizeof(sa));
178 sa.sa_handler = signal_handler;
179 sigemptyset(&sa.sa_mask);
180 sa.sa_flags = SA_RESTART;
182 if (sigaction(sig, &sa, &e->saved_sigaction) < 0)
184 if ((e->saved_handler = signal(sig, signal_handler)) == SIG_ERR)
199 void pa_signal_free(pa_signal_event *e) {
203 e->next->previous = e->previous;
205 e->previous->next = e->next;
209 #ifdef HAVE_SIGACTION
210 pa_assert_se(sigaction(e->sig, &e->saved_sigaction, NULL) == 0);
212 pa_assert_se(signal(e->sig, e->saved_handler) == signal_handler);
215 if (e->destroy_callback)
216 e->destroy_callback(api, e, e->userdata);
221 void pa_signal_set_destroy(pa_signal_event *e, void (*_callback) (pa_mainloop_api *api, pa_signal_event*e, void *userdata)) {
224 e->destroy_callback = _callback;