4 This file is part of polypaudio.
6 polypaudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 polypaudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
39 #include "mainloop-signal.h"
45 struct pa_signal_event
{
48 struct sigaction saved_sigaction
;
50 void (*saved_handler
)(int sig
);
52 void (*callback
) (pa_mainloop_api
*a
, pa_signal_event
*e
, int sig
, void *userdata
);
54 void (*destroy_callback
) (pa_mainloop_api
*a
, pa_signal_event
*e
, void *userdata
);
55 pa_signal_event
*previous
, *next
;
58 static pa_mainloop_api
*api
= NULL
;
59 static int signal_pipe
[2] = { -1, -1 };
60 static pa_io_event
* io_event
= NULL
;
61 static pa_defer_event
*defer_event
= NULL
;
62 static pa_signal_event
*signals
= NULL
;
65 static unsigned int waiting_signals
= 0;
66 static CRITICAL_SECTION crit
;
69 static void signal_handler(int sig
) {
70 #ifndef HAVE_SIGACTION
71 signal(sig
, signal_handler
);
73 write(signal_pipe
[1], &sig
, sizeof(sig
));
76 EnterCriticalSection(&crit
);
78 LeaveCriticalSection(&crit
);
82 static void dispatch(pa_mainloop_api
*a
, int sig
) {
85 for (s
= signals
; s
; s
= s
->next
)
88 s
->callback(a
, s
, sig
, s
->userdata
);
93 static void defer(pa_mainloop_api
*a
, PA_GCC_UNUSED pa_defer_event
*e
, PA_GCC_UNUSED
void *userdata
) {
99 EnterCriticalSection(&crit
);
100 sigs
= waiting_signals
;
102 LeaveCriticalSection(&crit
);
106 if ((r
= read(signal_pipe
[0], &sig
, sizeof(sig
))) < 0) {
107 pa_log(__FILE__
": read(): %s\n", strerror(errno
));
111 if (r
!= sizeof(sig
)) {
112 pa_log(__FILE__
": short read()\n");
122 static void callback(pa_mainloop_api
*a
, pa_io_event
*e
, int fd
, pa_io_event_flags_t f
, PA_GCC_UNUSED
void *userdata
) {
125 assert(a
&& e
&& f
== PA_IO_EVENT_INPUT
&& e
== io_event
&& fd
== signal_pipe
[0]);
128 if ((r
= read(signal_pipe
[0], &sig
, sizeof(sig
))) < 0) {
132 pa_log(__FILE__
": read(): %s\n", strerror(errno
));
136 if (r
!= sizeof(sig
)) {
137 pa_log(__FILE__
": short read()\n");
144 int pa_signal_init(pa_mainloop_api
*a
) {
145 assert(!api
&& a
&& signal_pipe
[0] == -1 && signal_pipe
[1] == -1 && !io_event
&& !defer_event
);
148 if (_pipe(signal_pipe
, 200, _O_BINARY
) < 0) {
150 if (pipe(signal_pipe
) < 0) {
152 pa_log(__FILE__
": pipe() failed: %s\n", strerror(errno
));
156 pa_make_nonblock_fd(signal_pipe
[0]);
157 pa_make_nonblock_fd(signal_pipe
[1]);
158 pa_fd_set_cloexec(signal_pipe
[0], 1);
159 pa_fd_set_cloexec(signal_pipe
[1], 1);
164 io_event
= api
->io_new(api
, signal_pipe
[0], PA_IO_EVENT_INPUT
, callback
, NULL
);
167 defer_event
= api
->defer_new(api
, defer
, NULL
);
170 InitializeCriticalSection(&crit
);
176 void pa_signal_done(void) {
177 assert(api
&& signal_pipe
[0] >= 0 && signal_pipe
[1] >= 0 && (io_event
|| defer_event
));
180 pa_signal_free(signals
);
184 api
->io_free(io_event
);
187 api
->defer_free(defer_event
);
190 DeleteCriticalSection(&crit
);
193 close(signal_pipe
[0]);
194 close(signal_pipe
[1]);
195 signal_pipe
[0] = signal_pipe
[1] = -1;
200 pa_signal_event
* pa_signal_new(int sig
, void (*_callback
) (pa_mainloop_api
*api
, pa_signal_event
*e
, int sig
, void *userdata
), void *userdata
) {
201 pa_signal_event
*e
= NULL
;
203 #ifdef HAVE_SIGACTION
207 assert(sig
> 0 && _callback
);
209 for (e
= signals
; e
; e
= e
->next
)
213 e
= pa_xmalloc(sizeof(pa_signal_event
));
215 e
->callback
= _callback
;
216 e
->userdata
= userdata
;
217 e
->destroy_callback
= NULL
;
219 #ifdef HAVE_SIGACTION
220 memset(&sa
, 0, sizeof(sa
));
221 sa
.sa_handler
= signal_handler
;
222 sigemptyset(&sa
.sa_mask
);
223 sa
.sa_flags
= SA_RESTART
;
225 if (sigaction(sig
, &sa
, &e
->saved_sigaction
) < 0)
227 if ((e
->saved_handler
= signal(sig
, signal_handler
)) == SIG_ERR
)
242 void pa_signal_free(pa_signal_event
*e
) {
246 e
->next
->previous
= e
->previous
;
248 e
->previous
->next
= e
->next
;
252 #ifdef HAVE_SIGACTION
253 sigaction(e
->sig
, &e
->saved_sigaction
, NULL
);
255 signal(e
->sig
, e
->saved_handler
);
258 if (e
->destroy_callback
)
259 e
->destroy_callback(api
, e
, e
->userdata
);
264 void pa_signal_set_destroy(pa_signal_event
*e
, void (*_callback
) (pa_mainloop_api
*api
, pa_signal_event
*e
, void *userdata
)) {
266 e
->destroy_callback
= _callback
;