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