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[disorder] / server / speaker.c
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460b9539 1/*
2 * This file is part of DisOrder
dea8f8aa 3 * Copyright (C) 2005, 2006, 2007 Richard Kettlewell
460b9539 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, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
1674096e 20/** @file server/speaker.c
cf714d85 21 * @brief Speaker process
1674096e 22 *
23 * This program is responsible for transmitting a single coherent audio stream
24 * to its destination (over the network, to some sound API, to some
42829e58
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25 * subprocess). It receives connections from decoders (or rather from the
26 * process that is about to become disorder-normalize) and plays them in the
27 * right order.
1674096e 28 *
795192f4 29 * @b Encodings. For the <a href="http://www.alsa-project.org/">ALSA</a> API,
30 * 8- and 16- bit stereo and mono are supported, with any sample rate (within
31 * the limits that ALSA can deal with.)
1674096e 32 *
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33 * Inbound data is expected to match @c config->sample_format. In normal use
34 * this is arranged by the @c disorder-normalize program (see @ref
35 * server/normalize.c).
1674096e 36 *
795192f4 37 * @b Garbage @b Collection. This program deliberately does not use the
38 * garbage collector even though it might be convenient to do so. This is for
39 * two reasons. Firstly some sound APIs use thread threads and we do not want
40 * to have to deal with potential interactions between threading and garbage
41 * collection. Secondly this process needs to be able to respond quickly and
42 * this is not compatible with the collector hanging the program even
43 * relatively briefly.
44 *
45 * @b Units. This program thinks at various times in three different units.
46 * Bytes are obvious. A sample is a single sample on a single channel. A
47 * frame is several samples on different channels at the same point in time.
48 * So (for instance) a 16-bit stereo frame is 4 bytes and consists of a pair of
49 * 2-byte samples.
1674096e 50 */
460b9539 51
52#include <config.h>
53#include "types.h"
54
55#include <getopt.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <locale.h>
59#include <syslog.h>
60#include <unistd.h>
61#include <errno.h>
62#include <ao/ao.h>
63#include <string.h>
64#include <assert.h>
65#include <sys/select.h>
9d5da576 66#include <sys/wait.h>
460b9539 67#include <time.h>
8023f60b 68#include <fcntl.h>
69#include <poll.h>
84aa9f93 70#include <sys/un.h>
460b9539 71
72#include "configuration.h"
73#include "syscalls.h"
74#include "log.h"
75#include "defs.h"
76#include "mem.h"
ea410ba1 77#include "speaker-protocol.h"
460b9539 78#include "user.h"
cf714d85 79#include "speaker.h"
460b9539 80
cf714d85 81/** @brief Linked list of all prepared tracks */
82struct track *tracks;
e83d0967 83
cf714d85 84/** @brief Playing track, or NULL */
85struct track *playing;
460b9539 86
1c3f1e73 87/** @brief Number of bytes pre frame */
6d2d327c 88size_t bpf;
1c3f1e73 89
90/** @brief Array of file descriptors for poll() */
91struct pollfd fds[NFDS];
92
93/** @brief Next free slot in @ref fds */
94int fdno;
95
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96/** @brief Listen socket */
97static int listenfd;
98
460b9539 99static time_t last_report; /* when we last reported */
100static int paused; /* pause status */
50ae38dd 101
5a7c42a8 102/** @brief The current device state */
103enum device_states device_state;
50ae38dd 104
55f35f2d 105/** @brief Set when idled
106 *
107 * This is set when the sound device is deliberately closed by idle().
55f35f2d 108 */
1c3f1e73 109int idled;
460b9539 110
29601377 111/** @brief Selected backend */
112static const struct speaker_backend *backend;
113
460b9539 114static const struct option options[] = {
115 { "help", no_argument, 0, 'h' },
116 { "version", no_argument, 0, 'V' },
117 { "config", required_argument, 0, 'c' },
118 { "debug", no_argument, 0, 'd' },
119 { "no-debug", no_argument, 0, 'D' },
120 { 0, 0, 0, 0 }
121};
122
123/* Display usage message and terminate. */
124static void help(void) {
125 xprintf("Usage:\n"
126 " disorder-speaker [OPTIONS]\n"
127 "Options:\n"
128 " --help, -h Display usage message\n"
129 " --version, -V Display version number\n"
130 " --config PATH, -c PATH Set configuration file\n"
131 " --debug, -d Turn on debugging\n"
132 "\n"
133 "Speaker process for DisOrder. Not intended to be run\n"
134 "directly.\n");
135 xfclose(stdout);
136 exit(0);
137}
138
139/* Display version number and terminate. */
140static void version(void) {
141 xprintf("disorder-speaker version %s\n", disorder_version_string);
142 xfclose(stdout);
143 exit(0);
144}
145
1674096e 146/** @brief Return the number of bytes per frame in @p format */
6d2d327c 147static size_t bytes_per_frame(const struct stream_header *format) {
460b9539 148 return format->channels * format->bits / 8;
149}
150
1674096e 151/** @brief Find track @p id, maybe creating it if not found */
460b9539 152static struct track *findtrack(const char *id, int create) {
153 struct track *t;
154
155 D(("findtrack %s %d", id, create));
156 for(t = tracks; t && strcmp(id, t->id); t = t->next)
157 ;
158 if(!t && create) {
159 t = xmalloc(sizeof *t);
160 t->next = tracks;
161 strcpy(t->id, id);
162 t->fd = -1;
163 tracks = t;
460b9539 164 }
165 return t;
166}
167
1674096e 168/** @brief Remove track @p id (but do not destroy it) */
460b9539 169static struct track *removetrack(const char *id) {
170 struct track *t, **tt;
171
172 D(("removetrack %s", id));
173 for(tt = &tracks; (t = *tt) && strcmp(id, t->id); tt = &t->next)
174 ;
175 if(t)
176 *tt = t->next;
177 return t;
178}
179
1674096e 180/** @brief Destroy a track */
460b9539 181static void destroy(struct track *t) {
182 D(("destroy %s", t->id));
183 if(t->fd != -1) xclose(t->fd);
460b9539 184 free(t);
185}
186
1674096e 187/** @brief Read data into a sample buffer
188 * @param t Pointer to track
189 * @return 0 on success, -1 on EOF
190 *
55f35f2d 191 * This is effectively the read callback on @c t->fd. It is called from the
192 * main loop whenever the track's file descriptor is readable, assuming the
193 * buffer has not reached the maximum allowed occupancy.
1674096e 194 */
460b9539 195static int fill(struct track *t) {
196 size_t where, left;
197 int n;
198
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199 D(("fill %s: eof=%d used=%zu",
200 t->id, t->eof, t->used));
460b9539 201 if(t->eof) return -1;
6d2d327c 202 if(t->used < sizeof t->buffer) {
460b9539 203 /* there is room left in the buffer */
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204 where = (t->start + t->used) % sizeof t->buffer;
205 /* Get as much data as we can */
206 if(where >= t->start) left = (sizeof t->buffer) - where;
207 else left = t->start - where;
460b9539 208 do {
209 n = read(t->fd, t->buffer + where, left);
210 } while(n < 0 && errno == EINTR);
211 if(n < 0) {
212 if(errno != EAGAIN) fatal(errno, "error reading sample stream");
213 return 0;
214 }
215 if(n == 0) {
216 D(("fill %s: eof detected", t->id));
217 t->eof = 1;
218 return -1;
219 }
220 t->used += n;
460b9539 221 }
222 return 0;
223}
224
55f35f2d 225/** @brief Close the sound device
226 *
227 * This is called to deactivate the output device when pausing, and also by the
228 * ALSA backend when changing encoding (in which case the sound device will be
229 * immediately reactivated).
230 */
460b9539 231static void idle(void) {
460b9539 232 D(("idle"));
5a7c42a8 233 if(backend->deactivate)
b5a99ad0 234 backend->deactivate();
5a7c42a8 235 else
236 device_state = device_closed;
e83d0967 237 idled = 1;
460b9539 238}
239
1674096e 240/** @brief Abandon the current track */
1c3f1e73 241void abandon(void) {
460b9539 242 struct speaker_message sm;
243
244 D(("abandon"));
245 memset(&sm, 0, sizeof sm);
246 sm.type = SM_FINISHED;
247 strcpy(sm.id, playing->id);
84aa9f93 248 speaker_send(1, &sm);
460b9539 249 removetrack(playing->id);
250 destroy(playing);
251 playing = 0;
1c6e6a61 252}
253
1674096e 254/** @brief Enable sound output
255 *
256 * Makes sure the sound device is open and has the right sample format. Return
257 * 0 on success and -1 on error.
258 */
5a7c42a8 259static void activate(void) {
6d2d327c 260 if(backend->activate)
5a7c42a8 261 backend->activate();
6d2d327c 262 else
5a7c42a8 263 device_state = device_open;
460b9539 264}
265
55f35f2d 266/** @brief Check whether the current track has finished
267 *
268 * The current track is determined to have finished either if the input stream
269 * eded before the format could be determined (i.e. it is malformed) or the
270 * input is at end of file and there is less than a frame left unplayed. (So
271 * it copes with decoders that crash mid-frame.)
272 */
460b9539 273static void maybe_finished(void) {
274 if(playing
275 && playing->eof
6d2d327c 276 && playing->used < bytes_per_frame(&config->sample_format))
460b9539 277 abandon();
278}
279
5a7c42a8 280/** @brief Play up to @p frames frames of audio
281 *
282 * It is always safe to call this function.
283 * - If @ref playing is 0 then it will just return
284 * - If @ref paused is non-0 then it will just return
285 * - If @ref device_state != @ref device_open then it will call activate() and
286 * return if it it fails.
287 * - If there is not enough audio to play then it play what is available.
288 *
289 * If there are not enough frames to play then whatever is available is played
290 * instead. It is up to mainloop() to ensure that play() is not called when
291 * unreasonably only an small amounts of data is available to play.
292 */
460b9539 293static void play(size_t frames) {
3c68b773 294 size_t avail_frames, avail_bytes, written_frames;
9d5da576 295 ssize_t written_bytes;
460b9539 296
5a7c42a8 297 /* Make sure there's a track to play and it is not pasued */
298 if(!playing || paused)
460b9539 299 return;
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300 /* Make sure the output device is open */
301 if(device_state != device_open) {
5a7c42a8 302 activate();
303 if(device_state != device_open)
304 return;
460b9539 305 }
6d2d327c 306 D(("play: play %zu/%zu%s %dHz %db %dc", frames, playing->used / bpf,
460b9539 307 playing->eof ? " EOF" : "",
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308 config->sample_format.rate,
309 config->sample_format.bits,
310 config->sample_format.channels));
460b9539 311 /* Figure out how many frames there are available to write */
6d2d327c 312 if(playing->start + playing->used > sizeof playing->buffer)
7f9d5847 313 /* The ring buffer is currently wrapped, only play up to the wrap point */
6d2d327c 314 avail_bytes = (sizeof playing->buffer) - playing->start;
460b9539 315 else
7f9d5847 316 /* The ring buffer is not wrapped, can play the lot */
460b9539 317 avail_bytes = playing->used;
6d2d327c 318 avail_frames = avail_bytes / bpf;
7f9d5847 319 /* Only play up to the requested amount */
320 if(avail_frames > frames)
321 avail_frames = frames;
322 if(!avail_frames)
323 return;
3c68b773 324 /* Play it, Sam */
325 written_frames = backend->play(avail_frames);
6d2d327c 326 written_bytes = written_frames * bpf;
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327 /* written_bytes and written_frames had better both be set and correct by
328 * this point */
460b9539 329 playing->start += written_bytes;
330 playing->used -= written_bytes;
331 playing->played += written_frames;
332 /* If the pointer is at the end of the buffer (or the buffer is completely
333 * empty) wrap it back to the start. */
6d2d327c 334 if(!playing->used || playing->start == (sizeof playing->buffer))
460b9539 335 playing->start = 0;
336 frames -= written_frames;
5a7c42a8 337 return;
460b9539 338}
339
340/* Notify the server what we're up to. */
341static void report(void) {
342 struct speaker_message sm;
343
6d2d327c 344 if(playing) {
460b9539 345 memset(&sm, 0, sizeof sm);
346 sm.type = paused ? SM_PAUSED : SM_PLAYING;
347 strcpy(sm.id, playing->id);
6d2d327c 348 sm.data = playing->played / config->sample_format.rate;
84aa9f93 349 speaker_send(1, &sm);
460b9539 350 }
351 time(&last_report);
352}
353
9d5da576 354static void reap(int __attribute__((unused)) sig) {
e83d0967 355 pid_t cmdpid;
9d5da576 356 int st;
357
358 do
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359 cmdpid = waitpid(-1, &st, WNOHANG);
360 while(cmdpid > 0);
9d5da576 361 signal(SIGCHLD, reap);
362}
363
1c3f1e73 364int addfd(int fd, int events) {
460b9539 365 if(fdno < NFDS) {
366 fds[fdno].fd = fd;
367 fds[fdno].events = events;
368 return fdno++;
369 } else
370 return -1;
371}
372
572d74ba 373/** @brief Table of speaker backends */
1c3f1e73 374static const struct speaker_backend *backends[] = {
146e86fb 375#if HAVE_ALSA_ASOUNDLIB_H
1c3f1e73 376 &alsa_backend,
572d74ba 377#endif
1c3f1e73 378 &command_backend,
379 &network_backend,
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380#if HAVE_COREAUDIO_AUDIOHARDWARE_H
381 &coreaudio_backend,
382#endif
e99d42b1 383#if HAVE_SYS_SOUNDCARD_H
384 &oss_backend,
385#endif
1c3f1e73 386 0
572d74ba 387};
388
5a7c42a8 389/** @brief Return nonzero if we want to play some audio
55f35f2d 390 *
5a7c42a8 391 * We want to play audio if there is a current track; and it is not paused; and
392 * there are at least @ref FRAMES frames of audio to play, or we are in sight
393 * of the end of the current track.
55f35f2d 394 */
5a7c42a8 395static int playable(void) {
396 return playing
397 && !paused
398 && (playing->used >= FRAMES || playing->eof);
399}
400
401/** @brief Main event loop */
55f35f2d 402static void mainloop(void) {
572d74ba 403 struct track *t;
404 struct speaker_message sm;
84aa9f93 405 int n, fd, stdin_slot, timeout, listen_slot;
460b9539 406
460b9539 407 while(getppid() != 1) {
408 fdno = 0;
5a7c42a8 409 /* By default we will wait up to a second before thinking about current
410 * state. */
411 timeout = 1000;
460b9539 412 /* Always ready for commands from the main server. */
413 stdin_slot = addfd(0, POLLIN);
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414 /* Also always ready for inbound connections */
415 listen_slot = addfd(listenfd, POLLIN);
460b9539 416 /* Try to read sample data for the currently playing track if there is
417 * buffer space. */
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418 if(playing
419 && playing->fd >= 0
420 && !playing->eof
421 && playing->used < (sizeof playing->buffer))
460b9539 422 playing->slot = addfd(playing->fd, POLLIN);
5a7c42a8 423 else if(playing)
460b9539 424 playing->slot = -1;
5a7c42a8 425 if(playable()) {
426 /* We want to play some audio. If the device is closed then we attempt
427 * to open it. */
428 if(device_state == device_closed)
429 activate();
430 /* If the device is (now) open then we will wait up until it is ready for
431 * more. If something went wrong then we should have device_error
432 * instead, but the post-poll code will cope even if it's
433 * device_closed. */
434 if(device_state == device_open)
e84fb5f0 435 backend->beforepoll(&timeout);
5a7c42a8 436 }
460b9539 437 /* If any other tracks don't have a full buffer, try to read sample data
5a7c42a8 438 * from them. We do this last of all, so that if we run out of slots,
439 * nothing important can't be monitored. */
460b9539 440 for(t = tracks; t; t = t->next)
441 if(t != playing) {
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442 if(t->fd >= 0
443 && !t->eof
444 && t->used < sizeof t->buffer) {
9d5da576 445 t->slot = addfd(t->fd, POLLIN | POLLHUP);
460b9539 446 } else
447 t->slot = -1;
448 }
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449 /* Wait for something interesting to happen */
450 n = poll(fds, fdno, timeout);
460b9539 451 if(n < 0) {
452 if(errno == EINTR) continue;
453 fatal(errno, "error calling poll");
454 }
455 /* Play some sound before doing anything else */
5a7c42a8 456 if(playable()) {
457 /* We want to play some audio */
458 if(device_state == device_open) {
459 if(backend->ready())
460 play(3 * FRAMES);
461 } else {
462 /* We must be in _closed or _error, and it should be the latter, but we
463 * cope with either.
464 *
465 * We most likely timed out, so now is a good time to retry. play()
466 * knows to re-activate the device if necessary.
467 */
468 play(3 * FRAMES);
469 }
460b9539 470 }
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471 /* Perhaps a connection has arrived */
472 if(fds[listen_slot].revents & POLLIN) {
473 struct sockaddr_un addr;
474 socklen_t addrlen = sizeof addr;
475 uint32_t l;
476 char id[24];
477
dc450d30 478 if((fd = accept(listenfd, (struct sockaddr *)&addr, &addrlen)) >= 0) {
937be4c0 479 blocking(fd);
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480 if(read(fd, &l, sizeof l) < 4) {
481 error(errno, "reading length from inbound connection");
482 xclose(fd);
483 } else if(l >= sizeof id) {
484 error(0, "id length too long");
485 xclose(fd);
486 } else if(read(fd, id, l) < (ssize_t)l) {
487 error(errno, "reading id from inbound connection");
488 xclose(fd);
489 } else {
490 id[l] = 0;
491 D(("id %s fd %d", id, fd));
492 t = findtrack(id, 1/*create*/);
493 write(fd, "", 1); /* write an ack */
494 if(t->fd != -1) {
495 error(0, "got a connection for a track that already has one");
496 xclose(fd);
497 } else {
498 nonblock(fd);
499 t->fd = fd; /* yay */
500 }
501 }
502 } else
503 error(errno, "accept");
504 }
460b9539 505 /* Perhaps we have a command to process */
506 if(fds[stdin_slot].revents & POLLIN) {
5a7c42a8 507 /* There might (in theory) be several commands queued up, but in general
508 * this won't be the case, so we don't bother looping around to pick them
509 * all up. */
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510 n = speaker_recv(0, &sm);
511 /* TODO */
460b9539 512 if(n > 0)
513 switch(sm.type) {
460b9539 514 case SM_PLAY:
460b9539 515 if(playing) fatal(0, "got SM_PLAY but already playing something");
516 t = findtrack(sm.id, 1);
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517 D(("SM_PLAY %s fd %d", t->id, t->fd));
518 if(t->fd == -1)
519 error(0, "cannot play track because no connection arrived");
460b9539 520 playing = t;
5a7c42a8 521 /* We attempt to play straight away rather than going round the loop.
522 * play() is clever enough to perform any activation that is
523 * required. */
524 play(3 * FRAMES);
460b9539 525 report();
526 break;
527 case SM_PAUSE:
528 D(("SM_PAUSE"));
529 paused = 1;
530 report();
531 break;
532 case SM_RESUME:
533 D(("SM_RESUME"));
534 if(paused) {
535 paused = 0;
5a7c42a8 536 /* As for SM_PLAY we attempt to play straight away. */
460b9539 537 if(playing)
5a7c42a8 538 play(3 * FRAMES);
460b9539 539 }
540 report();
541 break;
542 case SM_CANCEL:
543 D(("SM_CANCEL %s", sm.id));
544 t = removetrack(sm.id);
545 if(t) {
546 if(t == playing) {
547 sm.type = SM_FINISHED;
548 strcpy(sm.id, playing->id);
84aa9f93 549 speaker_send(1, &sm);
460b9539 550 playing = 0;
551 }
552 destroy(t);
553 } else
554 error(0, "SM_CANCEL for unknown track %s", sm.id);
555 report();
556 break;
557 case SM_RELOAD:
558 D(("SM_RELOAD"));
c00fce3a 559 if(config_read(1)) error(0, "cannot read configuration");
460b9539 560 info("reloaded configuration");
561 break;
562 default:
563 error(0, "unknown message type %d", sm.type);
564 }
565 }
566 /* Read in any buffered data */
567 for(t = tracks; t; t = t->next)
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568 if(t->fd != -1
569 && t->slot != -1
570 && (fds[t->slot].revents & (POLLIN | POLLHUP)))
460b9539 571 fill(t);
460b9539 572 /* Maybe we finished playing a track somewhere in the above */
573 maybe_finished();
574 /* If we don't need the sound device for now then close it for the benefit
575 * of anyone else who wants it. */
5a7c42a8 576 if((!playing || paused) && device_state == device_open)
460b9539 577 idle();
578 /* If we've not reported out state for a second do so now. */
579 if(time(0) > last_report)
580 report();
581 }
55f35f2d 582}
583
584int main(int argc, char **argv) {
585 int n;
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586 struct sockaddr_un addr;
587 static const int one = 1;
937be4c0 588 struct speaker_message sm;
38b8221f 589 const char *d;
55f35f2d 590
591 set_progname(argv);
592 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
593 while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) {
594 switch(n) {
595 case 'h': help();
596 case 'V': version();
597 case 'c': configfile = optarg; break;
598 case 'd': debugging = 1; break;
599 case 'D': debugging = 0; break;
600 default: fatal(0, "invalid option");
601 }
602 }
38b8221f 603 if((d = getenv("DISORDER_DEBUG_SPEAKER"))) debugging = atoi(d);
55f35f2d 604 /* If stderr is a TTY then log there, otherwise to syslog. */
605 if(!isatty(2)) {
606 openlog(progname, LOG_PID, LOG_DAEMON);
607 log_default = &log_syslog;
608 }
c00fce3a 609 if(config_read(1)) fatal(0, "cannot read configuration");
6d2d327c 610 bpf = bytes_per_frame(&config->sample_format);
55f35f2d 611 /* ignore SIGPIPE */
612 signal(SIGPIPE, SIG_IGN);
613 /* reap kids */
614 signal(SIGCHLD, reap);
615 /* set nice value */
616 xnice(config->nice_speaker);
617 /* change user */
618 become_mortal();
619 /* make sure we're not root, whatever the config says */
620 if(getuid() == 0 || geteuid() == 0) fatal(0, "do not run as root");
621 /* identify the backend used to play */
1c3f1e73 622 for(n = 0; backends[n]; ++n)
623 if(backends[n]->backend == config->speaker_backend)
55f35f2d 624 break;
1c3f1e73 625 if(!backends[n])
55f35f2d 626 fatal(0, "unsupported backend %d", config->speaker_backend);
1c3f1e73 627 backend = backends[n];
55f35f2d 628 /* backend-specific initialization */
629 backend->init();
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630 /* set up the listen socket */
631 listenfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
632 memset(&addr, 0, sizeof addr);
633 addr.sun_family = AF_UNIX;
634 snprintf(addr.sun_path, sizeof addr.sun_path, "%s/speaker",
635 config->home);
636 if(unlink(addr.sun_path) < 0 && errno != ENOENT)
637 error(errno, "removing %s", addr.sun_path);
638 xsetsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
dc450d30 639 if(bind(listenfd, (const struct sockaddr *)&addr, sizeof addr) < 0)
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640 fatal(errno, "error binding socket to %s", addr.sun_path);
641 xlisten(listenfd, 128);
642 nonblock(listenfd);
643 info("listening on %s", addr.sun_path);
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644 memset(&sm, 0, sizeof sm);
645 sm.type = SM_READY;
646 speaker_send(1, &sm);
55f35f2d 647 mainloop();
460b9539 648 info("stopped (parent terminated)");
649 exit(0);
650}
651
652/*
653Local Variables:
654c-basic-offset:2
655comment-column:40
656fill-column:79
657indent-tabs-mode:nil
658End:
659*/