709cdfe1c5f5eff0ae72ccb4b04a76054603c252
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file audiod.c the paraslash's audio daemon */
20
21 #include "para.h"
22
23 #include "audiod.cmdline.h"
24 #include "list.h"
25 #include "close_on_fork.h"
26 #include "sched.h"
27 #include "recv.h"
28 #include "filter.h"
29 #include "grab_client.cmdline.h"
30 #include "grab_client.h"
31
32 #include "error.h"
33 #include "audiod.h"
34 #include "net.h"
35 #include "daemon.h"
36 #include "string.h"
37 #include "fd.h"
38 #include "write.h"
39 #include "write_common.h"
40
41 /** define the array of error lists needed by para_audiod */
42 INIT_AUDIOD_ERRLISTS;
43 /** define the array containing all supported audio formats */
44 DEFINE_AUDIO_FORMAT_ARRAY;
45
46 /**
47 * the possible modes of operation
48 *
49 * - off: disconnect from para_server
50 * - on: receive status information from para_server and play the audio stream
51 * - sb: only receive status information but not the audio stream
52 */
53 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
54
55 /** defines how to handle one supported audio format */
56 struct audio_format_info {
57 /** pointer to the receiver for this audio format */
58 struct receiver *receiver;
59 /** the receiver configuration */
60 void *receiver_conf;
61 /** the number of filters that should be activated for this audio format */
62 unsigned int num_filters;
63 /** pointer to the array of filters to be activated */
64 struct filter **filters;
65 /** pointer to the array of filter configurations */
66 void **filter_conf;
67 /** the number of filters that should be activated for this audio format */
68 unsigned int num_writers;
69 /** pointer to the array of writers to be activated */
70 struct writer **writers;
71 /** pointer to the array of writer configurations */
72 void **writer_conf;
73 /** do not start receiver/filters/writer before this time */
74 struct timeval restart_barrier;
75 };
76
77 /**
78 * describes one instance of a receiver-filter-writer chain
79 *
80 * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
81 * writer_node, writer_node_group.
82 */
83 struct slot_info {
84 /** number of the audio format in this slot */
85 int format;
86 /** writer start time */
87 struct timeval wstime;
88 /** the receiver info associated with this slot */
89 struct receiver_node *receiver_node;
90 /** the active filter chain */
91 struct filter_chain *fc;
92 /** the active writer node group */
93 struct writer_node_group *wng;
94 };
95 static struct slot_info slot[MAX_STREAM_SLOTS];
96
97 extern const char *status_item_list[NUM_STAT_ITEMS];
98
99 static struct gengetopt_args_info conf;
100 static struct timeval server_stream_start, sa_time_diff;
101 static int playing, current_decoder = -1,
102 audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
103 sa_time_diff_sign = 1;
104 static char *af_status, /* the audio format announced in server status */
105 *socket_name, *hostname;
106 static char *stat_item_values[NUM_STAT_ITEMS];
107 static FILE *logfile;
108 static const struct timeval restart_delay = {0, 200 * 1000};
109 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
110 static struct timeval *now;
111
112 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
113
114 /**
115 * the task for handling audiod commands
116 *
117 * \sa struct task, struct sched
118 */
119 struct command_task {
120 /** the local listening socket */
121 int fd;
122 /** the associated task structure */
123 struct task task;
124 };
125
126 /**
127 * the task for audiod's child (para_client stat)
128 *
129 * \sa struct task, struct sched
130 */
131 struct status_task {
132 /** the output of the stat command is read from this fd */
133 int fd;
134 /** stat data is stored here */
135 char buf[STRINGSIZE];
136 /** number of bytes loaded in \a buf */
137 unsigned loaded;
138 /** the associated task structure */
139 struct task task;
140 /** do not restart client command until this time */
141 struct timeval restart_barrier;
142 };
143 static struct status_task status_task_struct, *stat_task = &status_task_struct;
144
145 struct signal_task {
146 int fd;
147 int signum;
148 struct task task;
149 };
150
151 /** defines one command of para_audiod */
152 struct audiod_command {
153 /** the name of the command */
154 const char *name;
155 /** pointer to the function that handles the command */
156 int (*handler)(int, int, char**);
157 /**
158 * if the command prefers to handle the full line (rather than the usual
159 * argv[] array), it stores a pointer to the corresponding line handling
160 * function here. In this case, the above \a handler pointer must be NULL.
161 */
162 int (*line_handler)(int, char*);
163 /** one-line description of the command */
164 const char *description;
165 /** summary of the command line options */
166 const char *synopsis;
167 /** the long help text */
168 const char *help;
169 };
170 static int com_grab(int, char *);
171 static int com_cycle(int, int, char **);
172 static int com_help(int, int, char **);
173 static int com_kill(int, int, char **);
174 static int com_off(int, int, char **);
175 static int com_on(int, int, char **);
176 static int com_sb(int, int, char **);
177 static int com_stat(int, int, char **);
178 static int com_tasks(int, int, char **);
179 static int com_term(int, int, char **);
180 static struct audiod_command cmds[] = {
181 {
182 .name = "cycle",
183 .handler = com_cycle,
184 .description = "switch to next mode",
185 .synopsis = "cycle",
186 .help =
187
188 "on -> standby -> off -> on\n"
189
190 },
191 {
192 .name = "grab",
193 .line_handler = com_grab,
194 .description = "grab the audio stream",
195 .synopsis = "-- grab [grab_options]",
196 .help =
197
198 "grab ('splice') the audio stream at any position in the filter \n"
199 "chain and send that data back to the client. Try\n"
200 "\t para_audioc -- grab -h\n"
201 "for the list of available options.\n"
202 },
203
204 {
205 .name = "help",
206 .handler = com_help,
207 .description = "display command list or help for given command",
208 .synopsis = "help [command]",
209 .help =
210
211 "When I was younger, so much younger than today, I never needed\n"
212 "anybody's help in any way. But now these days are gone, I'm not so\n"
213 "self assured. Now I find I've changed my mind and opened up the doors.\n"
214 "\n"
215 " -- Beatles: Help\n"
216
217 },
218 {
219 .name = "kill",
220 .handler = com_kill,
221 .description = "kill an active audiod task",
222 .synopsis = "kill task_id [task_id ...]",
223 .help =
224
225 "call sched_unregister() and the event_handler of the given task(s)\n"
226
227 },
228 {
229 .name = "off",
230 .handler = com_off,
231 .description = "deactivate para_audiod",
232 .synopsis = "off",
233 .help =
234
235 "Close connection to para_server and stop all decoders.\n"
236
237 },
238 {
239 .name = "on",
240 .handler = com_on,
241 .description = "activate para_audiod",
242 .synopsis = "on",
243 .help =
244
245 "Establish connection to para_server, retrieve para_server's current\n"
246 "status. If playing, start corresponding decoder. Otherwise stop\n"
247 "all decoders.\n"
248
249 },
250 {
251 .name = "sb",
252 .handler = com_sb,
253 .description = "enter standby mode",
254 .synopsis = "sb",
255 .help =
256
257 "Stop all decoders but leave connection to para_server open.\n"
258
259 },
260 {
261 .name = "stat",
262 .handler = com_stat,
263 .description = "print status information",
264 .synopsis = "stat [item1 ...]",
265 .help =
266
267 "Dump given status items (all if none given) to stdout.\n"
268
269 },
270 {
271 .name = "tasks",
272 .handler = com_tasks,
273 .description = "list current tasks",
274 .synopsis = "tasks",
275 .help =
276
277 "print the list of task ids together with the status of each task\n"
278
279 },
280 {
281 .name = "term",
282 .handler = com_term,
283 .description = "terminate audiod",
284 .synopsis = "term",
285 .help =
286
287 "Stop all decoders, shut down connection to para_server and exit.\n"
288
289 },
290 {
291 .name = NULL,
292 }
293 };
294
295 /** iterate over all slots */
296 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
297 /** iterate over all supported audio formats */
298 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
299 /** iterate over the array of all audiod commands */
300 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
301
302 /**
303 * get the audio format number
304 * \param name the name of the audio format
305 *
306 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
307 * \a name is not a supported audio format.
308 */
309 int get_audio_format_num(char *name)
310 {
311 int i;
312 FOR_EACH_AUDIO_FORMAT(i)
313 if (!strcmp(name, audio_formats[i]))
314 return i;
315 return -E_UNSUPPORTED_AUDIO_FORMAT;
316 }
317
318 /*
319 * log function. first argument is loglevel.
320 */
321 void para_log(int ll, const char* fmt,...)
322 {
323 va_list argp;
324 FILE *outfd;
325 struct tm *tm;
326 time_t t1;
327 char str[MAXLINE] = "";
328
329 if (ll < conf.loglevel_arg)
330 return;
331 outfd = logfile? logfile : stderr;
332 time(&t1);
333 tm = localtime(&t1);
334 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
335 fprintf(outfd, "%s %s ", str, hostname);
336 if (conf.loglevel_arg <= INFO)
337 fprintf(outfd, "%i ", ll);
338 va_start(argp, fmt);
339 vfprintf(outfd, fmt, argp);
340 va_end(argp);
341 }
342
343 static int client_write(int fd, const char *buf)
344 {
345 size_t len = strlen(buf);
346 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
347 }
348
349 static char *get_time_string(struct timeval *newest_stime)
350 {
351 struct timeval diff, adj_stream_start, tmp;
352 int total = 0, use_server_time = 1;
353
354 if (!playing) {
355 if (length_seconds)
356 return NULL;
357 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
358 }
359 if (audiod_status == AUDIOD_OFF)
360 goto out;
361 if (sa_time_diff_sign > 0)
362 tv_diff(&server_stream_start, &sa_time_diff,
363 &adj_stream_start);
364 else
365 tv_add(&server_stream_start, &sa_time_diff,
366 &adj_stream_start);
367 tmp = adj_stream_start;
368 if (newest_stime && audiod_status == AUDIOD_ON) {
369 tv_diff(newest_stime, &adj_stream_start, &diff);
370 if (tv2ms(&diff) < 5000) {
371 tmp = *newest_stime;
372 use_server_time = 0;
373 }
374 }
375 tv_diff(now, &tmp, &diff);
376 total = diff.tv_sec + offset_seconds;
377 if (total > length_seconds)
378 total = length_seconds;
379 if (total < 0)
380 total = 0;
381 out:
382 return make_message(
383 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
384 status_item_list[SI_PLAY_TIME],
385 use_server_time? "~" : "",
386 total / 60,
387 total % 60,
388 (length_seconds - total) / 60,
389 (length_seconds - total) % 60,
390 length_seconds? (total * 100 + length_seconds / 2) /
391 length_seconds : 0,
392 length_seconds / 60,
393 length_seconds % 60
394 );
395 }
396
397 __malloc static char *audiod_status_string(void)
398 {
399 const char *status = (audiod_status == AUDIOD_ON)?
400 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
401 return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
402 }
403
404 static struct timeval *wstime(void)
405 {
406 int i;
407 struct timeval *max = NULL;
408 FOR_EACH_SLOT(i) {
409 struct slot_info *s = &slot[i];
410 if (!s->wng)
411 continue;
412 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
413 continue;
414 max = &s->wstime;
415 }
416 return max;
417 }
418 __malloc static char *decoder_flags(void)
419 {
420 int i;
421 char decoder_flags[MAX_STREAM_SLOTS + 1];
422
423 FOR_EACH_SLOT(i) {
424 struct slot_info *s = &slot[i];
425 char flag = '0';
426 if (s->receiver_node)
427 flag += 1;
428 if (s->wng)
429 flag += 2;
430 decoder_flags[i] = flag;
431 }
432 decoder_flags[MAX_STREAM_SLOTS] = '\0';
433 return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
434 decoder_flags);
435 }
436
437 static char *configfile_exists(void)
438 {
439 static char *config_file;
440
441 if (!config_file) {
442 char *home = para_homedir();
443 config_file = make_message("%s/.paraslash/audiod.conf", home);
444 free(home);
445 }
446 return file_exists(config_file)? config_file : NULL;
447 }
448
449 static void setup_signal_handling(void)
450 {
451 sig_task->fd = para_signal_init();
452 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
453 para_install_sighandler(SIGINT);
454 para_install_sighandler(SIGTERM);
455 para_install_sighandler(SIGCHLD);
456 para_install_sighandler(SIGHUP);
457 para_install_sighandler(SIGPIPE);
458 // signal(SIGPIPE, SIG_IGN);
459 }
460
461 static void audiod_status_dump(void)
462 {
463 static char *p_ts, *p_us, *p_as, *p_df;
464 struct timeval *t = wstime();
465 char *us, *tmp = get_time_string(t);
466
467 if (tmp && (!p_ts || strcmp(tmp, p_ts)))
468 stat_client_write(tmp, SI_PLAY_TIME);
469 free(p_ts);
470 p_ts = tmp;
471
472 us = uptime_str();
473 tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
474 free(us);
475 if (!p_us || strcmp(p_us, tmp))
476 stat_client_write(tmp, SI_AUDIOD_UPTIME);
477 free(p_us);
478 p_us = tmp;
479
480 tmp = audiod_status_string();
481 if (!p_as || strcmp(p_as, tmp))
482 stat_client_write(tmp, SI_AUDIOD_STATUS);
483 free(p_as);
484 p_as = tmp;
485
486 tmp = decoder_flags();
487 if (!p_df || strcmp(p_df, tmp))
488 stat_client_write(tmp, SI_DECODER_FLAGS);
489 free(p_df);
490 p_df = tmp;
491 }
492
493 static void clear_slot(int slot_num)
494 {
495 struct slot_info *s = &slot[slot_num];
496
497 PARA_INFO_LOG("clearing slot %d\n", slot_num);
498 memset(s, 0, sizeof(struct slot_info));
499 s->format = -1;
500 }
501
502 static void close_receiver(int slot_num)
503 {
504 struct slot_info *s = &slot[slot_num];
505 struct audio_format_info *a;
506
507 if (s->format < 0 || !s->receiver_node)
508 return;
509 a = &afi[s->format];
510 PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
511 audio_formats[s->format] , slot_num, s->receiver_node->eof);
512 // if (!s->receiver_node->eof)
513 // unregister_task(&s->receiver_node->task);
514 a->receiver->close(s->receiver_node);
515 free(s->receiver_node);
516 s->receiver_node = NULL;
517 /* set restart barrier */
518 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
519 }
520
521 static void kill_all_decoders(void)
522 {
523 int i;
524
525 FOR_EACH_SLOT(i) {
526 struct slot_info *s = &slot[i];
527 if (s->wng && !s->wng->eof) {
528 PARA_INFO_LOG("unregistering writer node group in slot %d\n",
529 i);
530 wng_unregister(s->wng);
531 s->wng->eof = 1;
532 }
533 if (s->fc && !s->fc->eof) {
534 PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
535 unregister_task(&s->fc->task);
536 s->fc->eof = 1;
537 }
538 if (s->receiver_node && !s->receiver_node->eof) {
539 PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
540 unregister_task(&s->receiver_node->task);
541 s->receiver_node->eof = 1;
542 }
543 }
544 }
545
546 static int get_empty_slot(void)
547 {
548 int i;
549 struct slot_info *s;
550
551 FOR_EACH_SLOT(i) {
552 s = &slot[i];
553 if (s->format < 0) {
554 clear_slot(i);
555 return i;
556 }
557 if (s->wng || s->receiver_node || s->fc)
558 continue;
559 clear_slot(i);
560 return i;
561 }
562 return -E_NO_MORE_SLOTS;
563 }
564
565 static int decoder_running(int format)
566 {
567 int i, ret = 0;
568 struct slot_info *s;
569
570 FOR_EACH_SLOT(i) {
571 s = &slot[i];
572 if (s->format == format && s->receiver_node)
573 ret |= 1;
574 if (s->format == format && s->wng)
575 ret |= 2;
576 }
577 return ret;
578 }
579
580 static void close_stat_pipe(void)
581 {
582 int i;
583
584 if (stat_task->fd < 0)
585 return;
586 PARA_NOTICE_LOG("%s", "closing status pipe\n");
587 close(stat_task->fd);
588 del_close_on_fork_list(stat_task->fd);
589 stat_task->fd = -1;
590 // kill_all_decoders();
591 for (i = 0; i < NUM_STAT_ITEMS; i++) {
592 free(stat_item_values[i]);
593 stat_item_values[i] = NULL;
594 }
595 dump_empty_status();
596 length_seconds = 0;
597 offset_seconds = 0;
598 audiod_status_dump();
599 playing = 0;
600 stat_item_values[SI_STATUS_BAR] = make_message(
601 "%s:no connection to para_server\n",
602 status_item_list[SI_STATUS_BAR]);
603 stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
604 }
605
606 static void __noreturn clean_exit(int status, const char *msg)
607 {
608 PARA_EMERG_LOG("%s\n", msg);
609 if (socket_name)
610 unlink(socket_name);
611 if (stat_task->fd >= 0)
612 close_stat_pipe();
613 exit(status);
614 }
615
616 /**
617 * get the number of filters
618 *
619 * \param audio_format_num the number identifying the audio format
620 *
621 * \return the number of filters for the given audio format
622 *
623 * \sa struct filter;
624 */
625 int num_filters(int audio_format_num)
626 {
627 return afi[audio_format_num].num_filters;
628 }
629
630 static void filter_event_handler(struct task *t)
631 {
632 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
633 struct filter_chain *fc = t->private_data;
634 fc->eof = 1;
635 unregister_task(t);
636 }
637
638 static void open_filters(int slot_num)
639 {
640 struct slot_info *s = &slot[slot_num];
641 struct audio_format_info *a = &afi[s->format];
642 int nf = a->num_filters;
643 int i;
644
645 s->fc = NULL;
646 if (!nf)
647 return;
648 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
649 s->fc = para_calloc(sizeof(struct filter_chain));
650 INIT_LIST_HEAD(&s->fc->filters);
651 s->fc->inbuf = s->receiver_node->buf;
652 s->fc->in_loaded = &s->receiver_node->loaded;
653 s->fc->input_eof = &s->receiver_node->eof;
654 s->fc->task.pre_select = filter_pre_select;
655 s->fc->task.event_handler = filter_event_handler;
656 s->fc->task.private_data = s->fc;
657 s->fc->task.flags = 0;
658 s->fc->eof = 0;
659
660 s->receiver_node->output_eof = &s->fc->eof;
661 sprintf(s->fc->task.status, "filter chain");
662 for (i = 0; i < nf; i++) {
663 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
664 fn->conf = a->filter_conf[i];
665 fn->fc = s->fc;
666 fn->filter = a->filters[i];
667 INIT_LIST_HEAD(&fn->callbacks);
668 list_add_tail(&fn->node, &s->fc->filters);
669 fn->filter->open(fn);
670 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
671 audio_formats[s->format], i + 1, nf,
672 fn->filter->name, slot_num);
673 s->fc->outbuf = fn->buf;
674 s->fc->out_loaded = &fn->loaded;
675 }
676 register_task(&s->fc->task);
677 }
678
679 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
680 {
681 struct filter_node *fn;
682 int i, j;
683
684 FOR_EACH_SLOT(i) {
685 struct slot_info *s = &slot[i];
686 if (s->format < 0 || !s->fc)
687 continue;
688 if (slot_num >= 0 && slot_num != i)
689 continue;
690 if (format >= 0 && s->format != format)
691 continue;
692 if (num_filters(i) < filternum)
693 continue;
694 /* success */
695 j = 1;
696 list_for_each_entry(fn, &s->fc->filters, node)
697 if (filternum <= 0 || j++ == filternum)
698 break;
699 return fn;
700 }
701 return NULL;
702 }
703
704 static void wng_event_handler(struct task *t)
705 {
706 struct writer_node_group *wng = t->private_data;
707
708 PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
709 wng->eof = 1;
710 wng_unregister(wng);
711 }
712
713 static void open_writers(int slot_num)
714 {
715 int ret, i;
716 struct slot_info *s = &slot[slot_num];
717 struct audio_format_info *a = &afi[s->format];
718
719 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
720 if (!a->num_writers)
721 s->wng = setup_default_wng();
722 else
723 s->wng = wng_new(a->num_writers);
724 if (s->fc) {
725 s->wng->buf = s->fc->outbuf;
726 s->wng->loaded = s->fc->out_loaded;
727 s->wng->input_eof = &s->fc->eof;
728 s->wng->channels = &s->fc->channels;
729 s->wng->samplerate = &s->fc->samplerate;
730 s->fc->output_eof = &s->wng->eof;
731 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
732 } else {
733 s->wng->buf = s->receiver_node->buf;
734 s->wng->loaded = &s->receiver_node->loaded;
735 s->wng->input_eof = &s->receiver_node->eof;
736 }
737 s->wng->task.event_handler = wng_event_handler;
738 for (i = 0; i < a->num_writers; i++) {
739 s->wng->writer_nodes[i].conf = a->writer_conf[i];
740 s->wng->writer_nodes[i].writer = a->writers[i];
741 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
742 }
743 ret = wng_open(s->wng);
744 if (ret < 0) {
745 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
746 return;
747 }
748 s->wstime = *now;
749 current_decoder = slot_num;
750 activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
751 }
752
753 static void rn_event_handler(struct task *t)
754 {
755 struct receiver_node *rn = t->private_data;
756
757 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
758 unregister_task(t);
759 rn->eof = 1;
760 }
761
762 static void open_receiver(int format)
763 {
764 struct audio_format_info *a = &afi[format];
765 struct slot_info *s;
766 int ret, slot_num;
767 struct receiver_node *rn;
768
769 slot_num = get_empty_slot();
770 if (slot_num < 0)
771 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
772 s = &slot[slot_num];
773 s->format = format;
774 s->receiver_node = para_calloc(sizeof(struct receiver_node));
775 rn = s->receiver_node;
776 rn->receiver = a->receiver;
777 rn->conf = a->receiver_conf;
778 ret = a->receiver->open(s->receiver_node);
779 if (ret < 0) {
780 PARA_ERROR_LOG("failed to open receiver (%s)\n",
781 PARA_STRERROR(-ret));
782 free(s->receiver_node);
783 s->receiver_node = NULL;
784 return;
785 }
786 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
787 audio_formats[s->format], a->receiver->name, slot_num);
788 rn->task.private_data = s->receiver_node;
789 rn->task.pre_select = a->receiver->pre_select;
790 rn->task.post_select = a->receiver->post_select;
791 rn->task.event_handler = rn_event_handler;
792 rn->task.flags = 0;
793 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
794 register_task(&rn->task);
795 }
796
797 static int is_frozen(int format)
798 {
799 struct audio_format_info *a = &afi[format];
800
801 return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
802 }
803
804 static void open_current_receiver(struct sched *s)
805 {
806 int i;
807
808 if (!af_status)
809 return;
810 i = get_audio_format_num(af_status);
811 if (i < 0)
812 return;
813 if (decoder_running(i) || is_frozen(i))
814 return;
815 open_receiver(i);
816 /*
817 * the receiver didn't get a chance to put his fd to the fd set.
818 * Make the upcoming select() return immediately to avoid a long
819 * timeout.
820 */
821 s->timeout.tv_sec = 0;
822 s->timeout.tv_usec = 1;
823 }
824
825 static void compute_time_diff(const struct timeval *status_time)
826 {
827 struct timeval tmp, diff;
828 static int count;
829 int sign;
830 const struct timeval max_deviation = {0, 500 * 1000};
831 const int time_smooth = 5;
832
833 sign = tv_diff(status_time, now, &diff);
834 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
835 // sign, sa_time_diff_sign);
836 if (!count) {
837 sa_time_diff_sign = sign;
838 sa_time_diff = diff;
839 count++;
840 return;
841 }
842 if (count > 5) {
843 int s = tv_diff(&diff, &sa_time_diff, &tmp);
844 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
845 PARA_WARNING_LOG("time diff jump: %lims\n",
846 s * tv2ms(&tmp));
847 }
848 count++;
849 sa_time_diff_sign = tv_convex_combination(
850 sa_time_diff_sign * time_smooth, &sa_time_diff,
851 count > 10? sign : sign * time_smooth, &diff,
852 &tmp);
853 sa_time_diff = tmp;
854 PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
855 sign > 0? "+" : "-",
856 tv2ms(&diff),
857 sa_time_diff_sign ? "+" : "-",
858 tv2ms(&sa_time_diff)
859 );
860 }
861
862 static void check_stat_line(char *line)
863 {
864 int itemnum;
865 size_t ilen = 0;
866 long unsigned sec, usec;
867 char *tmp;
868
869 // PARA_INFO_LOG("line: %s\n", line);
870 if (!line)
871 return;
872 itemnum = stat_line_valid(line);
873 if (itemnum < 0) {
874 PARA_WARNING_LOG("invalid status line: %s\n", line);
875 return;
876 }
877 tmp = make_message("%s\n", line);
878 stat_client_write(tmp, itemnum);
879 free(tmp);
880 free(stat_item_values[itemnum]);
881 stat_item_values[itemnum] = para_strdup(line);
882 ilen = strlen(status_item_list[itemnum]);
883 switch (itemnum) {
884 case SI_STATUS:
885 playing = strstr(line, "playing")? 1 : 0;
886 break;
887 case SI_FORMAT:
888 free(af_status);
889 af_status = para_strdup(line + ilen + 1);
890 break;
891 case SI_OFFSET:
892 offset_seconds = atoi(line + ilen + 1);
893 break;
894 case SI_LENGTH:
895 length_seconds = atoi(line + ilen + 1);
896 break;
897 case SI_STREAM_START:
898 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
899 server_stream_start.tv_sec = sec;
900 server_stream_start.tv_usec = usec;
901 }
902 break;
903 case SI_CURRENT_TIME:
904 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
905 struct timeval tv = {sec, usec};
906 compute_time_diff(&tv);
907 }
908 break;
909 }
910 }
911
912 static void handle_signal(int sig)
913 {
914 switch (sig) {
915 case SIGCHLD:
916 for (;;) {
917 pid_t pid = para_reap_child();
918 if (pid <= 0)
919 return;
920 PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
921 }
922 case SIGINT:
923 case SIGTERM:
924 case SIGHUP:
925 PARA_EMERG_LOG("terminating on signal %d\n", sig);
926 clean_exit(EXIT_FAILURE, "caught deadly signal");
927 return;
928 }
929 }
930
931 static void try_to_close_slot(int slot_num)
932 {
933 struct slot_info *s = &slot[slot_num];
934
935 if (s->format < 0)
936 return;
937 if (s->receiver_node && !s->receiver_node->eof)
938 return;
939 if (s->fc && !s->fc->eof)
940 return;
941 if (s->wng && !s->wng->eof)
942 return;
943 PARA_INFO_LOG("closing slot %d \n", slot_num);
944 wng_close(s->wng);
945 close_filters(s->fc);
946 free(s->fc);
947 close_receiver(slot_num);
948 clear_slot(slot_num);
949 }
950
951 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
952 {
953 int i;
954
955 t->ret = 1;
956 now = &s->now;
957 if (audiod_status != AUDIOD_ON || !playing)
958 kill_all_decoders();
959 else if (playing)
960 open_current_receiver(s);
961 FOR_EACH_SLOT(i) {
962 struct slot_info *s = &slot[i];
963 struct audio_format_info *a;
964
965 if (s->format < 0)
966 continue;
967 a = &afi[s->format];
968 if (!s->receiver_node)
969 continue;
970 if (!a->num_filters) {
971 if (s->receiver_node->loaded && !s->wng)
972 open_writers(i);
973 continue;
974 }
975 if (s->receiver_node->loaded && !s->fc) {
976 open_filters(i);
977 continue;
978 }
979 if (s->fc && *s->fc->out_loaded && !s->wng)
980 open_writers(i);
981 }
982 }
983
984 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
985 {
986 int i;
987
988 /* save away the current time for other users */
989 now = &s->now;
990 t->ret = 1;
991 FOR_EACH_SLOT(i)
992 try_to_close_slot(i);
993 }
994
995 static void init_audiod_task(struct task *t)
996 {
997 t->pre_select = audiod_pre_select;
998 t->post_select = audiod_post_select;
999 t->event_handler = NULL;
1000 t->private_data = t;
1001 t->flags = 0;
1002 sprintf(t->status, "audiod task");
1003 }
1004
1005 static int parse_stream_command(const char *txt, char **cmd)
1006 {
1007 char *p = strchr(txt, ':');
1008 int i;
1009
1010 if (!p)
1011 return -E_MISSING_COLON;
1012 p++;
1013 FOR_EACH_AUDIO_FORMAT(i) {
1014 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1015 continue;
1016 *cmd = p;
1017 return i;
1018 }
1019 return -E_UNSUPPORTED_AUDIO_FORMAT;
1020 }
1021
1022 static int add_filter(int format, char *cmdline)
1023 {
1024 struct audio_format_info *a = &afi[format];
1025 int filter_num, nf = a->num_filters;
1026
1027 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1028 if (filter_num < 0)
1029 return filter_num;
1030 a->filters[nf] = &filters[filter_num];
1031 a->num_filters++;
1032 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1033 a->filters[nf]->name);
1034 return filter_num;
1035 }
1036
1037 static int init_writers(void)
1038 {
1039 int i, ret, nw;
1040 char *cmd;
1041 struct audio_format_info *a;
1042
1043 init_supported_writers();
1044 nw = PARA_MAX(1, conf.writer_given);
1045 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
1046 FOR_EACH_AUDIO_FORMAT(i) {
1047 a = &afi[i];
1048 a->writer_conf = para_malloc(nw * sizeof(void *));
1049 a->writers = para_malloc(nw * sizeof(struct writer *));
1050 a->num_writers = 0;
1051 }
1052 for (i = 0; i < conf.writer_given; i++) {
1053 void *wconf;
1054 int writer_num;
1055 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1056 if (ret < 0)
1057 goto out;
1058 a = &afi[ret];
1059 nw = a->num_writers;
1060 wconf = check_writer_arg(cmd, &writer_num);
1061 if (!wconf) {
1062 ret = writer_num;
1063 goto out;
1064 }
1065 a->writers[nw] = &writers[writer_num];
1066 a->writer_conf[nw] = wconf;
1067 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1068 nw, writer_names[writer_num]);
1069 a->num_writers++;
1070 }
1071 ret = 1;
1072 out:
1073 return ret;
1074 }
1075
1076 static int init_receivers(void)
1077 {
1078 int i, ret, receiver_num;
1079 char *cmd = NULL;
1080 struct audio_format_info *a;
1081
1082 for (i = 0; receivers[i].name; i++) {
1083 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1084 receivers[i].init(&receivers[i]);
1085 }
1086 for (i = 0; i < conf.receiver_given; i++) {
1087 char *arg = conf.receiver_arg[i];
1088 char *recv = strchr(arg, ':');
1089 ret = -E_MISSING_COLON;
1090 if (!recv)
1091 goto out;
1092 *recv = '\0';
1093 recv++;
1094 ret = get_audio_format_num(arg);
1095 if (ret < 0)
1096 goto out;
1097 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1098 if (!afi[ret].receiver_conf) {
1099 ret = -E_RECV_SYNTAX;
1100 goto out;
1101 }
1102 afi[ret].receiver = &receivers[receiver_num];
1103 }
1104 /* use the first available receiver with no arguments
1105 * for those audio formats for which no receiver
1106 * was specified
1107 */
1108 cmd = para_strdup(receivers[0].name);
1109 FOR_EACH_AUDIO_FORMAT(i) {
1110 a = &afi[i];
1111 if (a->receiver_conf)
1112 continue;
1113 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1114 if (!a->receiver_conf)
1115 return -E_RECV_SYNTAX;
1116 a->receiver = &receivers[receiver_num];
1117 }
1118 ret = 1;
1119 out:
1120 free(cmd);
1121 return ret;
1122 }
1123
1124 static int init_default_filters(void)
1125 {
1126 int i, ret = 1;
1127
1128 FOR_EACH_AUDIO_FORMAT(i) {
1129 struct audio_format_info *a = &afi[i];
1130 char *tmp;
1131 int j;
1132
1133 if (a->num_filters)
1134 continue; /* no default -- nothing to to */
1135 /* add "dec" to audio format name */
1136 tmp = make_message("%sdec", audio_formats[i]);
1137 for (j = 0; filters[j].name; j++)
1138 if (!strcmp(tmp, filters[j].name))
1139 break;
1140 free(tmp);
1141 ret = -E_UNSUPPORTED_FILTER;
1142 if (!filters[j].name)
1143 goto out;
1144 tmp = para_strdup(filters[j].name);
1145 ret = add_filter(i, tmp);
1146 free(tmp);
1147 if (ret < 0)
1148 goto out;
1149 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1150 filters[j].name);
1151 }
1152 out:
1153 return ret;
1154 }
1155
1156 static int init_filters(void)
1157 {
1158 int i, ret, nf;
1159
1160 filter_init(filters);
1161 nf = PARA_MAX(1, conf.filter_given);
1162 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1163 FOR_EACH_AUDIO_FORMAT(i) {
1164 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1165 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1166 }
1167 if (!conf.no_default_filters_given)
1168 return init_default_filters();
1169 for (i = 0; i < conf.filter_given; i++) {
1170 char *arg = conf.filter_arg[i];
1171 char *filter_name = strchr(arg, ':');
1172 ret = -E_MISSING_COLON;
1173 if (!filter_name)
1174 goto out;
1175 *filter_name = '\0';
1176 filter_name++;
1177 ret = get_audio_format_num(arg);
1178 if (ret < 0)
1179 goto out;
1180 ret = add_filter(ret, filter_name);
1181 if (ret < 0)
1182 goto out;
1183 }
1184 ret = init_default_filters(); /* use default values for the rest */
1185 out:
1186 return ret;
1187 }
1188
1189 static int init_stream_io(void)
1190 {
1191 int ret;
1192
1193 ret = init_writers();
1194 if (ret < 0)
1195 return ret;
1196 ret = init_receivers();
1197 if (ret < 0)
1198 return ret;
1199 ret = init_filters();
1200 if (ret < 0)
1201 return ret;
1202 return 1;
1203 }
1204
1205 static int dump_commands(int fd)
1206 {
1207 char *buf = para_strdup(""), *tmp = NULL;
1208 int i;
1209 ssize_t ret;
1210
1211 FOR_EACH_COMMAND(i) {
1212 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1213 cmds[i].description);
1214 free(buf);
1215 buf = tmp;
1216 }
1217 ret = client_write(fd, buf);
1218 free(buf);
1219 return ret;
1220 }
1221
1222 /*
1223 * command handlers don't close their fd on errors (ret < 0) so that
1224 * its caller can send an error message. Otherwise (ret >= 0) it's up
1225 * to each individual command to close the fd if necessary.
1226 */
1227
1228 static int com_help(int fd, int argc, char **argv)
1229 {
1230 int i, ret;
1231 char *buf;
1232 const char *dflt = "No such command. Available commands:\n";
1233
1234 if (argc < 2) {
1235 ret = dump_commands(fd);
1236 goto out;
1237 }
1238 FOR_EACH_COMMAND(i) {
1239 if (strcmp(cmds[i].name, argv[1]))
1240 continue;
1241 buf = make_message(
1242 "NAME\n\t%s -- %s\n"
1243 "SYNOPSIS\n\tpara_audioc %s\n"
1244 "DESCRIPTION\n%s\n",
1245 argv[1],
1246 cmds[i].description,
1247 cmds[i].synopsis,
1248 cmds[i].help
1249 );
1250 ret = client_write(fd, buf);
1251 free(buf);
1252 goto out;
1253 }
1254 ret = client_write(fd, dflt);
1255 if (ret > 0)
1256 ret = dump_commands(fd);
1257 out:
1258 if (ret >= 0)
1259 close(fd);
1260 return ret;
1261 }
1262
1263 static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
1264 {
1265 char *tl = get_task_list();
1266 int ret = 1;
1267 if (tl)
1268 ret = client_write(fd, tl);
1269 free(tl);
1270 if (ret > 0)
1271 close(fd);
1272 return ret;
1273 }
1274
1275 static int com_kill(int fd, int argc, char **argv)
1276 {
1277 int i, ret = 1;
1278 if (argc < 2)
1279 return -E_AUDIOD_SYNTAX;
1280 for (i = 1; i < argc; i++) {
1281 ret = kill_task(argv[i]);
1282 if (ret < 0)
1283 break;
1284 }
1285 if (ret > 0)
1286 close(fd);
1287 return ret;
1288 }
1289
1290 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1291 {
1292 int i, ret;
1293 char *buf = NULL;
1294 long unsigned mask = ~0LU;
1295
1296 if (argc > 1) {
1297 mask = 0;
1298 for (i = 1; i < argc; i++) {
1299 ret = stat_item_valid(argv[i]);
1300 if (ret < 0)
1301 return ret;
1302 mask |= (1 << ret);
1303 }
1304 }
1305 PARA_INFO_LOG("mask: 0x%lx\n", mask);
1306 if (mask & (1 << SI_PLAY_TIME)) {
1307 struct timeval *t = wstime();
1308 char *ts = get_time_string(t);
1309 if (ts) {
1310 ret = client_write(fd, ts);
1311 if (ret < 0)
1312 goto out;
1313 free(ts);
1314 }
1315 }
1316 if (mask & (1 << SI_AUDIOD_UPTIME)) {
1317 char *tmp, *us = uptime_str();
1318 tmp = make_message("%s:%s\n",
1319 status_item_list[SI_AUDIOD_UPTIME], us);
1320 free(us);
1321 ret = client_write(fd, tmp);
1322 if (ret < 0)
1323 goto out;
1324 free(tmp);
1325 }
1326 if (mask & (1 << SI_AUDIOD_STATUS)) {
1327 char *s = audiod_status_string();
1328 ret = client_write(fd, s);
1329 if (ret < 0)
1330 goto out;
1331 free(s);
1332 }
1333 if (mask & (1 << SI_DECODER_FLAGS)) {
1334 char *df =decoder_flags();
1335 ret = client_write(fd, df);
1336 if (ret < 0)
1337 goto out;
1338 free(df);
1339 }
1340
1341 for (i = 0; i < NUM_STAT_ITEMS; i++) {
1342 char *tmp, *v;
1343 if (!((1 << i) & mask))
1344 continue;
1345 v = stat_item_values[i];
1346 tmp = make_message("%s%s%s", buf? buf: "",
1347 v? v : "", v? "\n" : "");
1348 free(buf);
1349 buf = tmp;
1350 }
1351 ret = client_write(fd, buf);
1352 out:
1353 if (ret > 0)
1354 ret = stat_client_add(fd, mask);
1355 free(buf);
1356 return ret;
1357 }
1358
1359 static int com_grab(int fd, char *cmdline)
1360 {
1361 struct grab_client *gc;
1362 struct filter_node *fn;
1363 int i, err;
1364 char *msg;
1365
1366 gc = grab_client_new(fd, cmdline, &err);
1367 if (!gc)
1368 goto err_out;
1369 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1370 if (fn)
1371 activate_grab_client(gc, fn);
1372 return 1;
1373 err_out:
1374 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1375 return err;
1376 if (err == -E_GC_HELP_GIVEN) {
1377 msg = make_message("%s\n\n", grab_client_args_info_usage);
1378 for (i = 0; grab_client_args_info_help[i]; i++) {
1379 char *tmp = make_message("%s%s\n", msg,
1380 grab_client_args_info_help[i]);
1381 free(msg);
1382 msg = tmp;
1383 }
1384 } else
1385 msg = make_message("%s %s\n",
1386 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1387 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1388 err = client_write(fd, msg);
1389 free(msg);
1390 if (err < 0)
1391 return err;
1392 close(fd);
1393 return 1;
1394 }
1395
1396 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1397 {
1398 close(fd);
1399 clean_exit(EXIT_SUCCESS, "terminating on user request");
1400 }
1401
1402 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1403 {
1404 audiod_status = AUDIOD_ON;
1405 close(fd);
1406 return 1;
1407 }
1408
1409 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1410 {
1411 audiod_status = AUDIOD_OFF;
1412 close(fd);
1413 return 1;
1414 }
1415
1416 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1417 {
1418 audiod_status = AUDIOD_STANDBY;
1419 close(fd);
1420 return 1;
1421 }
1422
1423 static int com_cycle(int fd, int argc, char **argv)
1424 {
1425 switch (audiod_status) {
1426 case AUDIOD_ON:
1427 return com_sb(fd, argc, argv);
1428 break;
1429 case AUDIOD_OFF:
1430 return com_on(fd, argc, argv);
1431 break;
1432 case AUDIOD_STANDBY:
1433 return com_off(fd, argc, argv);
1434 break;
1435 }
1436 close(fd);
1437 return 1;
1438 }
1439
1440 static int check_perms(uid_t uid)
1441 {
1442 int i;
1443
1444 if (!conf.user_allow_given)
1445 return 1;
1446 for (i = 0; i < conf.user_allow_given; i++)
1447 if (uid == conf.user_allow_arg[i])
1448 return 1;
1449 return -E_UCRED_PERM;
1450 }
1451
1452 static int handle_connect(int accept_fd)
1453 {
1454 int i, argc, ret, clifd = -1;
1455 char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1456 struct sockaddr_un unix_addr;
1457
1458 ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
1459 if (ret < 0)
1460 goto out;
1461 clifd = ret;
1462 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1463 if (ret < 0)
1464 goto out;
1465 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
1466 ret = check_perms(ret);
1467 if (ret < 0)
1468 goto out;
1469 ret = -E_INVALID_AUDIOD_CMD;
1470 cmd = para_strdup(buf);
1471 p = strchr(cmd, '\n');
1472 if (!p)
1473 p = "";
1474 else {
1475 *p = '\0';
1476 p++;
1477 }
1478 for (i = 0; cmds[i].name; i++) {
1479 int j;
1480 if (strcmp(cmds[i].name, cmd))
1481 continue;
1482 if (cmds[i].handler) {
1483 argc = split_args(buf, &argv, "\n");
1484 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1485 ret = cmds[i].handler(clifd, argc, argv);
1486 goto out;
1487 }
1488 for (j = 0; p[j]; j++)
1489 if (p[j] == '\n')
1490 p[j] = ' ';
1491 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1492 ret = cmds[i].line_handler(clifd, p);
1493 goto out;
1494 }
1495 ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1496 out:
1497 free(cmd);
1498 free(buf);
1499 free(argv);
1500 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1501 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1502 client_write(clifd, tmp);
1503 free(tmp);
1504 close(clifd);
1505 }
1506 return ret;
1507 }
1508
1509 static int audiod_get_socket(void)
1510 {
1511 struct sockaddr_un unix_addr;
1512 int fd;
1513
1514 if (conf.socket_given)
1515 socket_name = para_strdup(conf.socket_arg);
1516 else {
1517 char *hn = para_hostname();
1518 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1519 hn);
1520 free(hn);
1521 }
1522 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1523 if (conf.force_given)
1524 unlink(socket_name);
1525 fd = create_pf_socket(socket_name, &unix_addr,
1526 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1527 if (fd < 0) {
1528 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1529 exit(EXIT_FAILURE); /* do not unlink socket */
1530 }
1531 if (listen(fd , 5) < 0) {
1532 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1533 exit(EXIT_FAILURE); /* do not unlink socket */
1534 }
1535 add_close_on_fork_list(fd);
1536 return fd;
1537 }
1538
1539 static int open_stat_pipe(void)
1540 {
1541 int ret, fd[3] = {-1, 1, 0};
1542 pid_t pid;
1543 ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1544 if (ret >= 0) {
1545 ret = fd[1];
1546 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1547 add_close_on_fork_list(ret);
1548 } else
1549 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1550 return ret;
1551 }
1552
1553 void signal_event_handler(struct task *t)
1554 {
1555 struct signal_task *st = t->private_data;
1556
1557 if (t->ret != -E_SIGNAL_CAUGHT)
1558 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
1559 else
1560 handle_signal(st->signum);
1561 }
1562
1563 void signal_pre_select(struct sched *s, struct task *t)
1564 {
1565 struct signal_task *st = t->private_data;
1566 t->ret = 1;
1567 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1568 }
1569
1570 void signal_post_select(struct sched *s, struct task *t)
1571 {
1572 struct signal_task *st = t->private_data;
1573 t->ret = 1;
1574 if (!FD_ISSET(st->fd, &s->rfds))
1575 return;
1576 t->ret = -E_SIGNAL_CAUGHT;
1577 st->signum = para_next_signal();
1578 }
1579
1580 void signal_setup_default(struct signal_task *st)
1581 {
1582 st->task.pre_select = signal_pre_select;
1583 st->task.post_select = signal_post_select;
1584 st->task.private_data = st;
1585 st->task.flags = 0;
1586 sprintf(st->task.status, "signal task");
1587 }
1588
1589 static void command_pre_select(struct sched *s, struct task *t)
1590 {
1591 struct command_task *ct = t->private_data;
1592 t->ret = 1;
1593 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1594
1595 }
1596
1597 static void command_post_select(struct sched *s, struct task *t)
1598 {
1599 int ret;
1600 struct command_task *ct = t->private_data;
1601
1602 t->ret = 1; /* always successful */
1603 if (audiod_status != AUDIOD_OFF)
1604 audiod_status_dump();
1605 if (!FD_ISSET(ct->fd, &s->rfds))
1606 return;
1607 ret = handle_connect(ct->fd);
1608 if (ret < 0)
1609 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1610 }
1611
1612 static void init_command_task(struct command_task *ct)
1613 {
1614 ct->task.pre_select = command_pre_select;
1615 ct->task.post_select = command_post_select;
1616 ct->task.event_handler = NULL;
1617 ct->task.private_data = ct;
1618 ct->task.flags = 0;
1619 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1620 sprintf(ct->task.status, "command task");
1621 }
1622
1623 static void status_event_handler(__a_unused struct task *t)
1624 {
1625 struct timeval delay = {1, 0};
1626 int i;
1627 struct status_task *st = t->private_data;
1628
1629 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
1630 close_stat_pipe();
1631 /* avoid busy loop if server is down */
1632 tv_add(now, &delay, &st->restart_barrier);
1633 FOR_EACH_AUDIO_FORMAT(i)
1634 afi[i].restart_barrier = st->restart_barrier;
1635 }
1636
1637 static void status_pre_select(struct sched *s, struct task *t)
1638 {
1639 struct status_task *st = t->private_data;
1640 t->ret = 1;
1641 if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1642 close_stat_pipe();
1643 if (st->fd < 0 && audiod_status != AUDIOD_OFF
1644 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
1645 st->fd = open_stat_pipe();
1646 st->loaded = 0;
1647 st->buf[0] = '\0';
1648 }
1649 if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1650 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1651 }
1652
1653 static void status_post_select(struct sched *s, struct task *t)
1654 {
1655 struct status_task *st = t->private_data;
1656
1657 t->ret = 1;
1658 if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1659 return;
1660 t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1661 if (t->ret <= 0) {
1662 if (!t->ret)
1663 t->ret = -E_STATUS_EOF;
1664 return;
1665 }
1666 st->buf[t->ret + st->loaded] = '\0';
1667 st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1668 &check_stat_line);
1669 }
1670
1671 static void init_status_task(struct status_task *st)
1672 {
1673 memset(st, 0, sizeof(struct status_task));
1674 st->task.pre_select = status_pre_select;
1675 st->task.post_select = status_post_select;
1676 st->task.event_handler = status_event_handler;
1677 st->task.private_data = st;
1678 st->fd = -1;
1679 sprintf(st->task.status, "status task");
1680 }
1681
1682 static void set_initial_status(void)
1683 {
1684 audiod_status = AUDIOD_ON;
1685 if (!conf.mode_given)
1686 return;
1687 if (!strcmp(conf.mode_arg, "sb")) {
1688 audiod_status = AUDIOD_STANDBY;
1689 return;
1690 }
1691 if (!strcmp(conf.mode_arg, "off")) {
1692 audiod_status = AUDIOD_OFF;
1693 return;
1694 }
1695 if (strcmp(conf.mode_arg, "on"))
1696 PARA_WARNING_LOG("%s", "invalid mode\n");
1697 }
1698
1699 int main(int argc, char *argv[])
1700 {
1701 char *cf;
1702 int ret, i;
1703 struct sched s;
1704 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1705 struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1706
1707 init_sched();
1708
1709 valid_fd_012();
1710 hostname = para_hostname();
1711 cmdline_parser(argc, argv, &conf);
1712 para_drop_privileges(conf.user_arg, conf.group_arg);
1713 cf = configfile_exists();
1714 if (cf) {
1715 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1716 PARA_EMERG_LOG("%s", "parse error in config file\n");
1717 exit(EXIT_FAILURE);
1718 }
1719 }
1720 if (conf.logfile_given)
1721 logfile = open_log(conf.logfile_arg);
1722 log_welcome("para_audiod", conf.loglevel_arg);
1723 i = init_stream_io();
1724 if (i < 0) {
1725 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1726 exit(EXIT_FAILURE);
1727 }
1728 server_uptime(UPTIME_SET);
1729 set_initial_status();
1730 FOR_EACH_SLOT(i)
1731 clear_slot(i);
1732 init_grabbing();
1733 setup_signal_handling();
1734 signal_setup_default(sig_task);
1735 sig_task->task.event_handler = signal_event_handler;
1736
1737 init_status_task(stat_task);
1738 init_command_task(cmd_task);
1739 init_audiod_task(audiod_task);
1740
1741 if (conf.daemon_given)
1742 daemon_init();
1743
1744 register_task(&sig_task->task);
1745 register_task(&cmd_task->task);
1746 register_task(&stat_task->task);
1747 register_task(audiod_task);
1748 s.default_timeout.tv_sec = 3;
1749 s.default_timeout.tv_usec = 99 * 1000;
1750 ret = sched(&s);
1751
1752 PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1753 return EXIT_FAILURE;
1754 }