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/***
This file is part of PulseAudio.
Copyright 2004-2008 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/i18n.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include "mainloop-signal.h"
struct pa_signal_event {
int sig;
#ifdef HAVE_SIGACTION
struct sigaction saved_sigaction;
#else
void (*saved_handler)(int sig);
#endif
void *userdata;
pa_signal_cb_t callback;
pa_signal_destroy_cb_t destroy_callback;
pa_signal_event *previous, *next;
};
static pa_mainloop_api *api = NULL;
static int signal_pipe[2] = { -1, -1 };
static pa_io_event* io_event = NULL;
static pa_signal_event *signals = NULL;
static void signal_handler(int sig) {
int saved_errno;
saved_errno = errno;
#ifndef HAVE_SIGACTION
signal(sig, signal_handler);
#endif
/* XXX: If writing fails, there's nothing we can do? */
(void) pa_write(signal_pipe[1], &sig, sizeof(sig), NULL);
errno = saved_errno;
}
static void dispatch(pa_mainloop_api*a, int sig) {
pa_signal_event *s;
for (s = signals; s; s = s->next)
if (s->sig == sig) {
pa_assert(s->callback);
s->callback(a, s, sig, s->userdata);
break;
}
}
static void callback(pa_mainloop_api*a, pa_io_event*e, int fd, pa_io_event_flags_t f, void *userdata) {
ssize_t r;
int sig;
pa_assert(a);
pa_assert(e);
pa_assert(f == PA_IO_EVENT_INPUT);
pa_assert(e == io_event);
pa_assert(fd == signal_pipe[0]);
if ((r = pa_read(signal_pipe[0], &sig, sizeof(sig), NULL)) < 0) {
if (errno == EAGAIN)
return;
pa_log("read(): %s", pa_cstrerror(errno));
return;
}
if (r != sizeof(sig)) {
pa_log("short read()");
return;
}
dispatch(a, sig);
}
int pa_signal_init(pa_mainloop_api *a) {
pa_assert(a);
pa_assert(!api);
pa_assert(signal_pipe[0] == -1);
pa_assert(signal_pipe[1] == -1);
pa_assert(!io_event);
if (pa_pipe_cloexec(signal_pipe) < 0) {
pa_log("pipe(): %s", pa_cstrerror(errno));
return -1;
}
pa_make_fd_nonblock(signal_pipe[0]);
pa_make_fd_nonblock(signal_pipe[1]);
api = a;
pa_assert_se(io_event = api->io_new(api, signal_pipe[0], PA_IO_EVENT_INPUT, callback, NULL));
return 0;
}
void pa_signal_done(void) {
while (signals)
pa_signal_free(signals);
if (io_event) {
pa_assert(api);
api->io_free(io_event);
io_event = NULL;
}
pa_close_pipe(signal_pipe);
api = NULL;
}
pa_signal_event* pa_signal_new(int sig, pa_signal_cb_t _callback, void *userdata) {
pa_signal_event *e = NULL;
#ifdef HAVE_SIGACTION
struct sigaction sa;
#endif
pa_assert(sig > 0);
pa_assert(_callback);
pa_init_i18n();
for (e = signals; e; e = e->next)
if (e->sig == sig)
return NULL;
e = pa_xnew(pa_signal_event, 1);
e->sig = sig;
e->callback = _callback;
e->userdata = userdata;
e->destroy_callback = NULL;
#ifdef HAVE_SIGACTION
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(sig, &sa, &e->saved_sigaction) < 0)
#else
if ((e->saved_handler = signal(sig, signal_handler)) == SIG_ERR)
#endif
goto fail;
e->previous = NULL;
e->next = signals;
signals = e;
return e;
fail:
pa_xfree(e);
return NULL;
}
void pa_signal_free(pa_signal_event *e) {
pa_assert(e);
if (e->next)
e->next->previous = e->previous;
if (e->previous)
e->previous->next = e->next;
else
signals = e->next;
#ifdef HAVE_SIGACTION
pa_assert_se(sigaction(e->sig, &e->saved_sigaction, NULL) == 0);
#else
pa_assert_se(signal(e->sig, e->saved_handler) == signal_handler);
#endif
if (e->destroy_callback)
e->destroy_callback(api, e, e->userdata);
pa_xfree(e);
}
void pa_signal_set_destroy(pa_signal_event *e, pa_signal_destroy_cb_t _callback) {
pa_assert(e);
e->destroy_callback = _callback;
}
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