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Mildly more vigorous uninstall rules
[disorder] / server / speaker.c
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460b9539 1/*
2 * This file is part of DisOrder
5aff007d 3 * Copyright (C) 2005-2008 Richard Kettlewell
313acc77 4 * Portions (C) 2007 Mark Wooding
460b9539 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program 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.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 */
1674096e 21/** @file server/speaker.c
cf714d85 22 * @brief Speaker process
1674096e 23 *
24 * This program is responsible for transmitting a single coherent audio stream
25 * to its destination (over the network, to some sound API, to some
42829e58
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26 * subprocess). It receives connections from decoders (or rather from the
27 * process that is about to become disorder-normalize) and plays them in the
28 * right order.
1674096e 29 *
795192f4 30 * @b Encodings. For the <a href="http://www.alsa-project.org/">ALSA</a> API,
31 * 8- and 16- bit stereo and mono are supported, with any sample rate (within
32 * the limits that ALSA can deal with.)
1674096e 33 *
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34 * Inbound data is expected to match @c config->sample_format. In normal use
35 * this is arranged by the @c disorder-normalize program (see @ref
36 * server/normalize.c).
1674096e 37 *
3fbdc96d 387 * @b Garbage @b Collection. This program deliberately does not use the
795192f4 39 * garbage collector even though it might be convenient to do so. This is for
40 * two reasons. Firstly some sound APIs use thread threads and we do not want
41 * to have to deal with potential interactions between threading and garbage
42 * collection. Secondly this process needs to be able to respond quickly and
43 * this is not compatible with the collector hanging the program even
44 * relatively briefly.
45 *
46 * @b Units. This program thinks at various times in three different units.
47 * Bytes are obvious. A sample is a single sample on a single channel. A
48 * frame is several samples on different channels at the same point in time.
49 * So (for instance) a 16-bit stereo frame is 4 bytes and consists of a pair of
50 * 2-byte samples.
1674096e 51 */
460b9539 52
05b75f8d 53#include "common.h"
460b9539 54
55#include <getopt.h>
460b9539 56#include <locale.h>
57#include <syslog.h>
58#include <unistd.h>
59#include <errno.h>
60#include <ao/ao.h>
460b9539 61#include <sys/select.h>
9d5da576 62#include <sys/wait.h>
460b9539 63#include <time.h>
8023f60b 64#include <fcntl.h>
65#include <poll.h>
84aa9f93 66#include <sys/un.h>
a5f3ca1e 67#include <sys/stat.h>
460b9539 68
69#include "configuration.h"
70#include "syscalls.h"
71#include "log.h"
72#include "defs.h"
73#include "mem.h"
ea410ba1 74#include "speaker-protocol.h"
460b9539 75#include "user.h"
cf714d85 76#include "speaker.h"
85cb23d7 77#include "printf.h"
3fbdc96d 78#include "version.h"
460b9539 79
cf714d85 80/** @brief Linked list of all prepared tracks */
81struct track *tracks;
e83d0967 82
cf714d85 83/** @brief Playing track, or NULL */
84struct track *playing;
460b9539 85
1c3f1e73 86/** @brief Number of bytes pre frame */
6d2d327c 87size_t bpf;
1c3f1e73 88
89/** @brief Array of file descriptors for poll() */
90struct pollfd fds[NFDS];
91
92/** @brief Next free slot in @ref fds */
93int fdno;
94
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95/** @brief Listen socket */
96static int listenfd;
97
460b9539 98static time_t last_report; /* when we last reported */
99static int paused; /* pause status */
50ae38dd 100
5a7c42a8 101/** @brief The current device state */
102enum device_states device_state;
50ae38dd 103
55f35f2d 104/** @brief Set when idled
105 *
106 * This is set when the sound device is deliberately closed by idle().
55f35f2d 107 */
1c3f1e73 108int idled;
460b9539 109
29601377 110/** @brief Selected backend */
111static const struct speaker_backend *backend;
112
460b9539 113static const struct option options[] = {
114 { "help", no_argument, 0, 'h' },
115 { "version", no_argument, 0, 'V' },
116 { "config", required_argument, 0, 'c' },
117 { "debug", no_argument, 0, 'd' },
118 { "no-debug", no_argument, 0, 'D' },
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119 { "syslog", no_argument, 0, 's' },
120 { "no-syslog", no_argument, 0, 'S' },
460b9539 121 { 0, 0, 0, 0 }
122};
123
124/* Display usage message and terminate. */
125static void help(void) {
126 xprintf("Usage:\n"
127 " disorder-speaker [OPTIONS]\n"
128 "Options:\n"
129 " --help, -h Display usage message\n"
130 " --version, -V Display version number\n"
131 " --config PATH, -c PATH Set configuration file\n"
132 " --debug, -d Turn on debugging\n"
0ca6d097 133 " --[no-]syslog Force logging\n"
460b9539 134 "\n"
135 "Speaker process for DisOrder. Not intended to be run\n"
136 "directly.\n");
137 xfclose(stdout);
138 exit(0);
139}
140
1674096e 141/** @brief Return the number of bytes per frame in @p format */
6d2d327c 142static size_t bytes_per_frame(const struct stream_header *format) {
460b9539 143 return format->channels * format->bits / 8;
144}
145
1674096e 146/** @brief Find track @p id, maybe creating it if not found */
460b9539 147static struct track *findtrack(const char *id, int create) {
148 struct track *t;
149
150 D(("findtrack %s %d", id, create));
151 for(t = tracks; t && strcmp(id, t->id); t = t->next)
152 ;
153 if(!t && create) {
154 t = xmalloc(sizeof *t);
155 t->next = tracks;
156 strcpy(t->id, id);
157 t->fd = -1;
158 tracks = t;
460b9539 159 }
160 return t;
161}
162
1674096e 163/** @brief Remove track @p id (but do not destroy it) */
460b9539 164static struct track *removetrack(const char *id) {
165 struct track *t, **tt;
166
167 D(("removetrack %s", id));
168 for(tt = &tracks; (t = *tt) && strcmp(id, t->id); tt = &t->next)
169 ;
170 if(t)
171 *tt = t->next;
172 return t;
173}
174
1674096e 175/** @brief Destroy a track */
460b9539 176static void destroy(struct track *t) {
177 D(("destroy %s", t->id));
178 if(t->fd != -1) xclose(t->fd);
460b9539 179 free(t);
180}
181
1674096e 182/** @brief Read data into a sample buffer
183 * @param t Pointer to track
184 * @return 0 on success, -1 on EOF
185 *
55f35f2d 186 * This is effectively the read callback on @c t->fd. It is called from the
187 * main loop whenever the track's file descriptor is readable, assuming the
188 * buffer has not reached the maximum allowed occupancy.
1674096e 189 */
f5a03f58 190static int speaker_fill(struct track *t) {
460b9539 191 size_t where, left;
192 int n;
193
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194 D(("fill %s: eof=%d used=%zu",
195 t->id, t->eof, t->used));
460b9539 196 if(t->eof) return -1;
6d2d327c 197 if(t->used < sizeof t->buffer) {
460b9539 198 /* there is room left in the buffer */
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199 where = (t->start + t->used) % sizeof t->buffer;
200 /* Get as much data as we can */
201 if(where >= t->start) left = (sizeof t->buffer) - where;
202 else left = t->start - where;
460b9539 203 do {
204 n = read(t->fd, t->buffer + where, left);
205 } while(n < 0 && errno == EINTR);
206 if(n < 0) {
207 if(errno != EAGAIN) fatal(errno, "error reading sample stream");
208 return 0;
209 }
210 if(n == 0) {
211 D(("fill %s: eof detected", t->id));
212 t->eof = 1;
f5a03f58 213 t->playable = 1;
460b9539 214 return -1;
215 }
216 t->used += n;
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217 if(t->used == sizeof t->buffer)
218 t->playable = 1;
460b9539 219 }
220 return 0;
221}
222
55f35f2d 223/** @brief Close the sound device
224 *
225 * This is called to deactivate the output device when pausing, and also by the
226 * ALSA backend when changing encoding (in which case the sound device will be
227 * immediately reactivated).
228 */
460b9539 229static void idle(void) {
460b9539 230 D(("idle"));
5a7c42a8 231 if(backend->deactivate)
b5a99ad0 232 backend->deactivate();
5a7c42a8 233 else
234 device_state = device_closed;
e83d0967 235 idled = 1;
460b9539 236}
237
1674096e 238/** @brief Abandon the current track */
1c3f1e73 239void abandon(void) {
460b9539 240 struct speaker_message sm;
241
242 D(("abandon"));
243 memset(&sm, 0, sizeof sm);
244 sm.type = SM_FINISHED;
245 strcpy(sm.id, playing->id);
84aa9f93 246 speaker_send(1, &sm);
460b9539 247 removetrack(playing->id);
248 destroy(playing);
249 playing = 0;
1c6e6a61 250}
251
1674096e 252/** @brief Enable sound output
253 *
254 * Makes sure the sound device is open and has the right sample format. Return
255 * 0 on success and -1 on error.
256 */
5a7c42a8 257static void activate(void) {
6d2d327c 258 if(backend->activate)
5a7c42a8 259 backend->activate();
6d2d327c 260 else
5a7c42a8 261 device_state = device_open;
460b9539 262}
263
55f35f2d 264/** @brief Check whether the current track has finished
265 *
266 * The current track is determined to have finished either if the input stream
267 * eded before the format could be determined (i.e. it is malformed) or the
268 * input is at end of file and there is less than a frame left unplayed. (So
269 * it copes with decoders that crash mid-frame.)
270 */
460b9539 271static void maybe_finished(void) {
272 if(playing
273 && playing->eof
6d2d327c 274 && playing->used < bytes_per_frame(&config->sample_format))
460b9539 275 abandon();
276}
277
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278/** @brief Return nonzero if we want to play some audio
279 *
280 * We want to play audio if there is a current track; and it is not paused; and
281 * it is playable according to the rules for @ref track::playable.
282 */
283static int playable(void) {
284 return playing
285 && !paused
286 && playing->playable;
287}
288
5a7c42a8 289/** @brief Play up to @p frames frames of audio
290 *
291 * It is always safe to call this function.
292 * - If @ref playing is 0 then it will just return
293 * - If @ref paused is non-0 then it will just return
294 * - If @ref device_state != @ref device_open then it will call activate() and
295 * return if it it fails.
296 * - If there is not enough audio to play then it play what is available.
297 *
298 * If there are not enough frames to play then whatever is available is played
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299 * instead. It is up to mainloop() to ensure that speaker_play() is not called
300 * when unreasonably only an small amounts of data is available to play.
5a7c42a8 301 */
dac25ef9 302static void speaker_play(size_t frames) {
3c68b773 303 size_t avail_frames, avail_bytes, written_frames;
9d5da576 304 ssize_t written_bytes;
460b9539 305
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306 /* Make sure there's a track to play and it is not paused */
307 if(!playable())
460b9539 308 return;
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309 /* Make sure the output device is open */
310 if(device_state != device_open) {
5a7c42a8 311 activate();
312 if(device_state != device_open)
313 return;
460b9539 314 }
6d2d327c 315 D(("play: play %zu/%zu%s %dHz %db %dc", frames, playing->used / bpf,
460b9539 316 playing->eof ? " EOF" : "",
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317 config->sample_format.rate,
318 config->sample_format.bits,
319 config->sample_format.channels));
460b9539 320 /* Figure out how many frames there are available to write */
6d2d327c 321 if(playing->start + playing->used > sizeof playing->buffer)
7f9d5847 322 /* The ring buffer is currently wrapped, only play up to the wrap point */
6d2d327c 323 avail_bytes = (sizeof playing->buffer) - playing->start;
460b9539 324 else
7f9d5847 325 /* The ring buffer is not wrapped, can play the lot */
460b9539 326 avail_bytes = playing->used;
6d2d327c 327 avail_frames = avail_bytes / bpf;
7f9d5847 328 /* Only play up to the requested amount */
329 if(avail_frames > frames)
330 avail_frames = frames;
331 if(!avail_frames)
332 return;
3c68b773 333 /* Play it, Sam */
334 written_frames = backend->play(avail_frames);
6d2d327c 335 written_bytes = written_frames * bpf;
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336 /* written_bytes and written_frames had better both be set and correct by
337 * this point */
460b9539 338 playing->start += written_bytes;
339 playing->used -= written_bytes;
340 playing->played += written_frames;
341 /* If the pointer is at the end of the buffer (or the buffer is completely
342 * empty) wrap it back to the start. */
6d2d327c 343 if(!playing->used || playing->start == (sizeof playing->buffer))
460b9539 344 playing->start = 0;
f5a03f58 345 /* If the buffer emptied out mark the track as unplayably */
3496051f 346 if(!playing->used && !playing->eof) {
f74fc096 347 error(0, "track buffer emptied");
f5a03f58 348 playing->playable = 0;
f74fc096 349 }
460b9539 350 frames -= written_frames;
5a7c42a8 351 return;
460b9539 352}
353
354/* Notify the server what we're up to. */
355static void report(void) {
356 struct speaker_message sm;
357
6d2d327c 358 if(playing) {
460b9539 359 memset(&sm, 0, sizeof sm);
360 sm.type = paused ? SM_PAUSED : SM_PLAYING;
361 strcpy(sm.id, playing->id);
6d2d327c 362 sm.data = playing->played / config->sample_format.rate;
84aa9f93 363 speaker_send(1, &sm);
460b9539 364 }
365 time(&last_report);
366}
367
9d5da576 368static void reap(int __attribute__((unused)) sig) {
e83d0967 369 pid_t cmdpid;
9d5da576 370 int st;
371
372 do
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373 cmdpid = waitpid(-1, &st, WNOHANG);
374 while(cmdpid > 0);
9d5da576 375 signal(SIGCHLD, reap);
376}
377
1c3f1e73 378int addfd(int fd, int events) {
460b9539 379 if(fdno < NFDS) {
380 fds[fdno].fd = fd;
381 fds[fdno].events = events;
382 return fdno++;
383 } else
384 return -1;
385}
386
572d74ba 387/** @brief Table of speaker backends */
1c3f1e73 388static const struct speaker_backend *backends[] = {
146e86fb 389#if HAVE_ALSA_ASOUNDLIB_H
1c3f1e73 390 &alsa_backend,
572d74ba 391#endif
1c3f1e73 392 &command_backend,
393 &network_backend,
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394#if HAVE_COREAUDIO_AUDIOHARDWARE_H
395 &coreaudio_backend,
396#endif
e99d42b1 397#if HAVE_SYS_SOUNDCARD_H
398 &oss_backend,
399#endif
1c3f1e73 400 0
572d74ba 401};
402
5a7c42a8 403/** @brief Main event loop */
55f35f2d 404static void mainloop(void) {
572d74ba 405 struct track *t;
406 struct speaker_message sm;
84aa9f93 407 int n, fd, stdin_slot, timeout, listen_slot;
460b9539 408
460b9539 409 while(getppid() != 1) {
410 fdno = 0;
5a7c42a8 411 /* By default we will wait up to a second before thinking about current
412 * state. */
413 timeout = 1000;
460b9539 414 /* Always ready for commands from the main server. */
415 stdin_slot = addfd(0, POLLIN);
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416 /* Also always ready for inbound connections */
417 listen_slot = addfd(listenfd, POLLIN);
460b9539 418 /* Try to read sample data for the currently playing track if there is
419 * buffer space. */
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420 if(playing
421 && playing->fd >= 0
422 && !playing->eof
423 && playing->used < (sizeof playing->buffer))
460b9539 424 playing->slot = addfd(playing->fd, POLLIN);
5a7c42a8 425 else if(playing)
460b9539 426 playing->slot = -1;
5a7c42a8 427 if(playable()) {
428 /* We want to play some audio. If the device is closed then we attempt
429 * to open it. */
430 if(device_state == device_closed)
431 activate();
432 /* If the device is (now) open then we will wait up until it is ready for
433 * more. If something went wrong then we should have device_error
434 * instead, but the post-poll code will cope even if it's
435 * device_closed. */
436 if(device_state == device_open)
e84fb5f0 437 backend->beforepoll(&timeout);
5a7c42a8 438 }
460b9539 439 /* If any other tracks don't have a full buffer, try to read sample data
5a7c42a8 440 * from them. We do this last of all, so that if we run out of slots,
441 * nothing important can't be monitored. */
460b9539 442 for(t = tracks; t; t = t->next)
443 if(t != playing) {
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444 if(t->fd >= 0
445 && !t->eof
446 && t->used < sizeof t->buffer) {
9d5da576 447 t->slot = addfd(t->fd, POLLIN | POLLHUP);
460b9539 448 } else
449 t->slot = -1;
450 }
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451 /* Wait for something interesting to happen */
452 n = poll(fds, fdno, timeout);
460b9539 453 if(n < 0) {
454 if(errno == EINTR) continue;
455 fatal(errno, "error calling poll");
456 }
457 /* Play some sound before doing anything else */
5a7c42a8 458 if(playable()) {
459 /* We want to play some audio */
460 if(device_state == device_open) {
461 if(backend->ready())
dac25ef9 462 speaker_play(3 * FRAMES);
5a7c42a8 463 } else {
464 /* We must be in _closed or _error, and it should be the latter, but we
465 * cope with either.
466 *
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467 * We most likely timed out, so now is a good time to retry.
468 * speaker_play() knows to re-activate the device if necessary.
5a7c42a8 469 */
dac25ef9 470 speaker_play(3 * FRAMES);
5a7c42a8 471 }
460b9539 472 }
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473 /* Perhaps a connection has arrived */
474 if(fds[listen_slot].revents & POLLIN) {
475 struct sockaddr_un addr;
476 socklen_t addrlen = sizeof addr;
477 uint32_t l;
478 char id[24];
479
dc450d30 480 if((fd = accept(listenfd, (struct sockaddr *)&addr, &addrlen)) >= 0) {
937be4c0 481 blocking(fd);
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482 if(read(fd, &l, sizeof l) < 4) {
483 error(errno, "reading length from inbound connection");
484 xclose(fd);
485 } else if(l >= sizeof id) {
486 error(0, "id length too long");
487 xclose(fd);
488 } else if(read(fd, id, l) < (ssize_t)l) {
489 error(errno, "reading id from inbound connection");
490 xclose(fd);
491 } else {
492 id[l] = 0;
493 D(("id %s fd %d", id, fd));
494 t = findtrack(id, 1/*create*/);
495 write(fd, "", 1); /* write an ack */
496 if(t->fd != -1) {
66bb2e02 497 error(0, "%s: already got a connection", id);
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498 xclose(fd);
499 } else {
500 nonblock(fd);
501 t->fd = fd; /* yay */
502 }
503 }
504 } else
505 error(errno, "accept");
506 }
460b9539 507 /* Perhaps we have a command to process */
508 if(fds[stdin_slot].revents & POLLIN) {
5a7c42a8 509 /* There might (in theory) be several commands queued up, but in general
510 * this won't be the case, so we don't bother looping around to pick them
511 * all up. */
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512 n = speaker_recv(0, &sm);
513 /* TODO */
460b9539 514 if(n > 0)
515 switch(sm.type) {
460b9539 516 case SM_PLAY:
460b9539 517 if(playing) fatal(0, "got SM_PLAY but already playing something");
518 t = findtrack(sm.id, 1);
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519 D(("SM_PLAY %s fd %d", t->id, t->fd));
520 if(t->fd == -1)
521 error(0, "cannot play track because no connection arrived");
460b9539 522 playing = t;
5a7c42a8 523 /* We attempt to play straight away rather than going round the loop.
dac25ef9 524 * speaker_play() is clever enough to perform any activation that is
5a7c42a8 525 * required. */
dac25ef9 526 speaker_play(3 * FRAMES);
460b9539 527 report();
528 break;
529 case SM_PAUSE:
530 D(("SM_PAUSE"));
531 paused = 1;
532 report();
533 break;
534 case SM_RESUME:
535 D(("SM_RESUME"));
536 if(paused) {
537 paused = 0;
5a7c42a8 538 /* As for SM_PLAY we attempt to play straight away. */
460b9539 539 if(playing)
dac25ef9 540 speaker_play(3 * FRAMES);
460b9539 541 }
542 report();
543 break;
544 case SM_CANCEL:
819f5988 545 D(("SM_CANCEL %s", sm.id));
460b9539 546 t = removetrack(sm.id);
547 if(t) {
548 if(t == playing) {
819f5988 549 /* scratching the playing track */
460b9539 550 sm.type = SM_FINISHED;
460b9539 551 playing = 0;
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RK
552 } else {
553 /* Could be scratching the playing track before it's quite got
554 * going, or could be just removing a track from the queue. We
555 * log more because there's been a bug here recently than because
556 * it's particularly interesting; the log message will be removed
557 * if no further problems show up. */
558 info("SM_CANCEL for nonplaying track %s", sm.id);
559 sm.type = SM_STILLBORN;
460b9539 560 }
819f5988 561 strcpy(sm.id, t->id);
460b9539 562 destroy(t);
2b2a5fed 563 } else {
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564 /* Probably scratching the playing track well before it's got
565 * going, but could indicate a bug, so we log this as an error. */
2b2a5fed 566 sm.type = SM_UNKNOWN;
460b9539 567 error(0, "SM_CANCEL for unknown track %s", sm.id);
2b2a5fed 568 }
819f5988 569 speaker_send(1, &sm);
460b9539 570 report();
571 break;
572 case SM_RELOAD:
573 D(("SM_RELOAD"));
c00fce3a 574 if(config_read(1)) error(0, "cannot read configuration");
460b9539 575 info("reloaded configuration");
576 break;
577 default:
578 error(0, "unknown message type %d", sm.type);
579 }
580 }
581 /* Read in any buffered data */
582 for(t = tracks; t; t = t->next)
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583 if(t->fd != -1
584 && t->slot != -1
585 && (fds[t->slot].revents & (POLLIN | POLLHUP)))
f5a03f58 586 speaker_fill(t);
460b9539 587 /* Maybe we finished playing a track somewhere in the above */
588 maybe_finished();
589 /* If we don't need the sound device for now then close it for the benefit
590 * of anyone else who wants it. */
5a7c42a8 591 if((!playing || paused) && device_state == device_open)
460b9539 592 idle();
593 /* If we've not reported out state for a second do so now. */
594 if(time(0) > last_report)
595 report();
596 }
55f35f2d 597}
598
599int main(int argc, char **argv) {
0ca6d097 600 int n, logsyslog = !isatty(2);
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601 struct sockaddr_un addr;
602 static const int one = 1;
937be4c0 603 struct speaker_message sm;
38b8221f 604 const char *d;
85cb23d7 605 char *dir;
55f35f2d 606
607 set_progname(argv);
608 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
0ca6d097 609 while((n = getopt_long(argc, argv, "hVc:dDSs", options, 0)) >= 0) {
55f35f2d 610 switch(n) {
611 case 'h': help();
3fbdc96d 612 case 'V': version("disorder-speaker");
55f35f2d 613 case 'c': configfile = optarg; break;
614 case 'd': debugging = 1; break;
615 case 'D': debugging = 0; break;
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616 case 'S': logsyslog = 0; break;
617 case 's': logsyslog = 1; break;
55f35f2d 618 default: fatal(0, "invalid option");
619 }
620 }
38b8221f 621 if((d = getenv("DISORDER_DEBUG_SPEAKER"))) debugging = atoi(d);
0ca6d097 622 if(logsyslog) {
55f35f2d 623 openlog(progname, LOG_PID, LOG_DAEMON);
624 log_default = &log_syslog;
625 }
c00fce3a 626 if(config_read(1)) fatal(0, "cannot read configuration");
6d2d327c 627 bpf = bytes_per_frame(&config->sample_format);
55f35f2d 628 /* ignore SIGPIPE */
629 signal(SIGPIPE, SIG_IGN);
630 /* reap kids */
631 signal(SIGCHLD, reap);
632 /* set nice value */
633 xnice(config->nice_speaker);
634 /* change user */
635 become_mortal();
636 /* make sure we're not root, whatever the config says */
637 if(getuid() == 0 || geteuid() == 0) fatal(0, "do not run as root");
638 /* identify the backend used to play */
1c3f1e73 639 for(n = 0; backends[n]; ++n)
bd8895a8 640 if(backends[n]->backend == config->api)
55f35f2d 641 break;
1c3f1e73 642 if(!backends[n])
bd8895a8 643 fatal(0, "unsupported api %d", config->api);
1c3f1e73 644 backend = backends[n];
55f35f2d 645 /* backend-specific initialization */
646 backend->init();
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647 /* create the socket directory */
648 byte_xasprintf(&dir, "%s/speaker", config->home);
649 unlink(dir); /* might be a leftover socket */
a5f3ca1e 650 if(mkdir(dir, 0700) < 0 && errno != EEXIST)
85cb23d7 651 fatal(errno, "error creating %s", dir);
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652 /* set up the listen socket */
653 listenfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
654 memset(&addr, 0, sizeof addr);
655 addr.sun_family = AF_UNIX;
85cb23d7 656 snprintf(addr.sun_path, sizeof addr.sun_path, "%s/speaker/socket",
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657 config->home);
658 if(unlink(addr.sun_path) < 0 && errno != ENOENT)
659 error(errno, "removing %s", addr.sun_path);
660 xsetsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
dc450d30 661 if(bind(listenfd, (const struct sockaddr *)&addr, sizeof addr) < 0)
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662 fatal(errno, "error binding socket to %s", addr.sun_path);
663 xlisten(listenfd, 128);
664 nonblock(listenfd);
665 info("listening on %s", addr.sun_path);
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666 memset(&sm, 0, sizeof sm);
667 sm.type = SM_READY;
668 speaker_send(1, &sm);
55f35f2d 669 mainloop();
460b9539 670 info("stopped (parent terminated)");
671 exit(0);
672}
673
674/*
675Local Variables:
676c-basic-offset:2
677comment-column:40
678fill-column:79
679indent-tabs-mode:nil
680End:
681*/