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