audiod.c

   1 /*
   2  * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c The paraslash's audio daemon. */
   8
   9 #include <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "crypt.h"
  21 #include "audiod.cmdline.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "ggo.h"
  25 #include "buffer_tree.h"
  26 #include "recv.h"
  27 #include "filter.h"
  28 #include "grab_client.h"
  29 #include "client.cmdline.h"
  30 #include "client.h"
  31 #include "audiod.h"
  32 #include "net.h"
  33 #include "daemon.h"
  34 #include "string.h"
  35 #include "fd.h"
  36 #include "write.h"
  37 #include "write_common.h"
  38 #include "signal.h"
  39 #include "version.h"
  40
  41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  46
  47 DEFINE_RECEIVER_ARRAY;
  48
  49 /** Defines how audiod handles one supported audio format. */
  50 struct audio_format_info {
  51         /** pointer to the receiver for this audio format */
  52         struct receiver *receiver;
  53         /** the receiver configuration */
  54         void *receiver_conf;
  55         /** the number of filters that should be activated for this audio format */
  56         unsigned int num_filters;
  57         /** Array of filter numbers to be activated. */
  58         unsigned *filter_nums;
  59         /** Pointer to the array of filter configurations. */
  60         void **filter_conf;
  61         /** the number of filters that should be activated for this audio format */
  62         unsigned int num_writers;
  63         /** Array of writer numbers to be activated. */
  64         int *writer_nums;
  65         /** pointer to the array of writer configurations */
  66         void **writer_conf;
  67         /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  73  * be associated with a receiver/filter/writer triple. This array holds all
  74  * information on the status of these slots.
  75  *
  76  * \sa struct slot_info
  77  * */
  78 struct slot_info slot[MAX_STREAM_SLOTS];
  79
  80 /** The vss status flags audiod is interested in. */
  81 enum vss_status_flags {
  82         /** Whether the 'N' flag is set. */
  83         VSS_STATUS_FLAG_NEXT = 1,
  84         /** The 'P' flag is set. */
  85         VSS_STATUS_FLAG_PLAYING = 2,
  86 };
  87
  88 /**
  89  * The scheduler instance of para_audiod.
  90  *
  91  * This is needed also in audiod_command.c (for the tasks command), so it can
  92  * not be made static.
  93  */
  94 struct sched sched = {.max_fileno = 0};
  95
  96 /* The task for obtaining para_server's status (para_client stat). */
  97 struct status_task {
  98         /** The associated task structure of audiod. */
  99         struct task *task;
 100         /** Client data associated with the stat task. */
 101         struct client_task *ct;
 102         /** Do not restart client command until this time. */
 103         struct timeval restart_barrier;
 104         /** Last time we received status data from para_server. */
 105         struct timeval last_status_read;
 106         size_t min_iqs;
 107         /** The offset value announced by para_server. */
 108         int offset_seconds;
 109         /** The length of the current audio file as announced by para_server. */
 110         int length_seconds;
 111         /** The start of the current stream from the view of para_server. */
 112         struct timeval server_stream_start;
 113         /** The average time deviation between para_server and para_audiod. */
 114         struct timeval sa_time_diff;
 115         /** Whether client time is ahead of server time. */
 116         int sa_time_diff_sign;
 117         /** The 'P' and the 'N' flags as announced by para_server. */
 118         enum vss_status_flags vss_status;
 119         /** Number of times the clock difference is to be checked. */
 120         unsigned clock_diff_count;
 121         /** When to start the next check for clock difference. */
 122         struct timeval clock_diff_barrier;
 123         /** Number of the audio format as announced by para_server. */
 124         int current_audio_format_num;
 125         /* The status task btrn is the child of the client task. */
 126         struct btr_node *btrn;
 127 };
 128
 129 /** The array of status items sent by para_server. */
 130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 131
 132 /**
 133  * the current mode of operation of which can be changed by the on/off/cycle
 134  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 135  */
 136 int audiod_status = AUDIOD_ON;
 137
 138 /**
 139  * the gengetopt args_info struct that holds information on all command line
 140  * arguments
 141  */
 142 struct audiod_args_info conf;
 143
 144 static char *socket_name;
 145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 146
 147 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 148
 149 static struct status_task status_task_struct;
 150
 151 /**
 152  * the task that calls the status command of para_server
 153  *
 154  * \sa struct status_task
 155  */
 156 static struct status_task *stat_task = &status_task_struct;
 157
 158 /**
 159  * the task for handling audiod commands
 160  *
 161  * \sa struct task, struct sched
 162  */
 163 struct command_task {
 164         /** the local listening socket */
 165         int fd;
 166         /** the associated task structure */
 167         struct task *task;
 168 };
 169
 170 /** iterate over all supported audio formats */
 171 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 172
 173 /**
 174  * Get the audio format number.
 175  *
 176  * \param name The name of the audio format.
 177  *
 178  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 179  * \a name is not a supported audio format.
 180  */
 181 static int get_audio_format_num(const char *name)
 182 {
 183         int i;
 184
 185         while (para_isspace(*name))
 186                 name++;
 187         FOR_EACH_AUDIO_FORMAT(i)
 188                 if (!strcmp(name, audio_formats[i]))
 189                         return i;
 190         return -E_UNSUPPORTED_AUDIO_FORMAT;
 191 }
 192
 193 static int get_matching_audio_format_nums(const char *re)
 194 {
 195         int i, ret;
 196         regex_t preg;
 197
 198         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 199         if (ret < 0)
 200                 return ret;
 201         ret = 0;
 202         FOR_EACH_AUDIO_FORMAT(i)
 203                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 204                         ret |= (1 << i);
 205         regfree(&preg);
 206         return ret;
 207 }
 208
 209 /**
 210  * Compute the play time based on information of the given slot.
 211  *
 212  * \param slot_num The slot number (negative means: no slot).
 213  *
 214  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 215  * from the status items received from para_server and the start time of the
 216  * (first) writer of the given slot.
 217  *
 218  * It has to take into account that the stream was probably not started at
 219  * the beginning of the file, that the clock between the server and the client
 220  * host may differ and that playback of the stream was delayed, e.g. because
 221  * the prebuffer filter is used in the filter configuration of the given slot.
 222  *
 223  * If no writer is active in the given slot, or \a slot_num is negative
 224  * (indicating that para_audiod runs in standby mode), an approximation based
 225  * only on the status items is computed and the returned string is prefixed
 226  * with "~".
 227  *
 228  * \return A string that must be freed by the caller.
 229  */
 230 char *get_time_string(int slot_num)
 231 {
 232         int ret, seconds = 0, length;
 233         struct timeval *tmp, sum, sss, /* server stream start */
 234                 rstime, /* receiver start time */
 235                 wstime, /* writer start time */
 236                 wtime, /* now - writer start */
 237                 rskip; /* receiver start - sss */
 238         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 239         char *msg;
 240
 241         if (audiod_status == AUDIOD_OFF)
 242                 goto empty;
 243         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 244                 if (stat_task->length_seconds) /* paused */
 245                         return NULL;
 246                 goto empty; /* stopped */
 247         }
 248         if (audiod_status == AUDIOD_ON && !s)
 249                 goto empty;
 250         /*
 251          * Valid status items and playing, set length and tmp to the stream
 252          * start. We use the slot info and fall back to the info from current
 253          * status items if no slot info is available.
 254          */
 255         length = stat_task->length_seconds;
 256         tmp = &stat_task->server_stream_start;
 257         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 258                 btr_get_node_start(s->wns[0].btrn, &wstime);
 259                 if (wstime.tv_sec != 0) { /* writer wrote something */
 260                         if (s->server_stream_start.tv_sec == 0) {
 261                                 /* copy status info to slot */
 262                                 s->server_stream_start = stat_task->server_stream_start;
 263                                 s->offset_seconds = stat_task->offset_seconds;
 264                                 s->seconds_total = stat_task->length_seconds;
 265                         }
 266                         length = s->seconds_total;
 267                         tmp = &s->server_stream_start;
 268                 }
 269         }
 270         if (stat_task->sa_time_diff_sign > 0)
 271                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 272         else
 273                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 274         if (!s || !s->wns || !s->wns[0].btrn) {
 275                 struct timeval diff;
 276                 tv_diff(now, &sss, &diff);
 277                 seconds = diff.tv_sec + stat_task->offset_seconds;
 278                 goto out;
 279         }
 280         tv_diff(now, &wstime, &wtime);
 281         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 282         seconds = s->offset_seconds;
 283         if (s->receiver_node->btrn) {
 284                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 285                 ret = tv_diff(&rstime, &sss, &rskip);
 286                 if (ret > 0) { /* audiod was started in the middle of the stream */
 287                         tv_add(&wtime, &rskip, &sum);
 288                         seconds += sum.tv_sec;
 289                 } else
 290                         seconds += wtime.tv_sec;
 291         } else
 292                 seconds += wtime.tv_sec;
 293 out:
 294         seconds = PARA_MIN(seconds, length);
 295         seconds = PARA_MAX(seconds, 0);
 296         msg = make_message(
 297                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 298                 s? "" : "~",
 299                 seconds / 60,
 300                 seconds % 60,
 301                 (length - seconds) / 60,
 302                 (length - seconds) % 60,
 303                 length? (seconds * 100 + length / 2) / length : 0,
 304                 length / 60,
 305                 length % 60
 306         );
 307         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 308         return msg;
 309 empty:
 310         return para_strdup(NULL);
 311 }
 312
 313 static void parse_config_or_die(void)
 314 {
 315         int ret;
 316         char *config_file;
 317         struct audiod_cmdline_parser_params params = {
 318                 .override = 0,
 319                 .initialize = 0,
 320                 .check_required = 1,
 321                 .check_ambiguity = 0,
 322                 .print_errors = 1
 323         };
 324
 325         if (conf.config_file_given)
 326                 config_file = para_strdup(conf.config_file_arg);
 327         else {
 328                 char *home = para_homedir();
 329                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 330                 free(home);
 331         }
 332         ret = file_exists(config_file);
 333         if (conf.config_file_given && !ret) {
 334                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 335                 goto err;
 336         }
 337         if (ret) {
 338                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 339                 daemon_set_loglevel(conf.loglevel_arg);
 340         }
 341         free(config_file);
 342         return;
 343 err:
 344         free(config_file);
 345         exit(EXIT_FAILURE);
 346 }
 347
 348 static void setup_signal_handling(void)
 349 {
 350         sig_task->fd = para_signal_init();
 351         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 352         para_install_sighandler(SIGINT);
 353         para_install_sighandler(SIGTERM);
 354         para_install_sighandler(SIGHUP);
 355         para_sigaction(SIGPIPE, SIG_IGN);
 356 }
 357
 358 static void clear_slot(int slot_num)
 359 {
 360         struct slot_info *s = &slot[slot_num];
 361
 362         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 363         memset(s, 0, sizeof(struct slot_info));
 364         s->format = -1;
 365 }
 366
 367 static void close_receiver(int slot_num)
 368 {
 369         struct slot_info *s = &slot[slot_num];
 370         struct audio_format_info *a;
 371
 372         if (s->format < 0 || !s->receiver_node)
 373                 return;
 374         a = &afi[s->format];
 375         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 376                 audio_formats[s->format], slot_num);
 377         a->receiver->close(s->receiver_node);
 378         btr_remove_node(&s->receiver_node->btrn);
 379         task_reap(&s->receiver_node->task);
 380         free(s->receiver_node);
 381         s->receiver_node = NULL;
 382         stat_task->current_audio_format_num = -1;
 383         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 384                 &a->restart_barrier);
 385 }
 386
 387 static void writer_cleanup(struct writer_node *wn)
 388 {
 389         struct writer *w;
 390
 391         if (!wn)
 392                 return;
 393         w = writers + wn->writer_num;
 394         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 395         w->close(wn);
 396         btr_remove_node(&wn->btrn);
 397         task_reap(&wn->task);
 398 }
 399
 400 static void close_writers(struct slot_info *s)
 401 {
 402         struct audio_format_info *a;
 403         int i;
 404
 405         if (s->format < 0)
 406                 return;
 407         assert(s->wns);
 408         a = afi + s->format;
 409         if (a->num_writers == 0)
 410                 writer_cleanup(s->wns);
 411         else {
 412                 for (i = 0; i < a->num_writers; i++)
 413                         writer_cleanup(s->wns + i);
 414         }
 415         free(s->wns);
 416         s->wns = NULL;
 417 }
 418
 419 static void close_filters(struct slot_info *s)
 420 {
 421         int i;
 422         struct audio_format_info *a = afi + s->format;
 423         if (a->num_filters == 0)
 424                 return;
 425         for (i = a->num_filters - 1; i >= 0; i--) {
 426                 struct filter_node *fn = s->fns + i;
 427                 struct filter *f;
 428
 429                 if (!fn)
 430                         continue;
 431                 f = filters + fn->filter_num;
 432                 if (f->close)
 433                         f->close(fn);
 434                 btr_remove_node(&fn->btrn);
 435                 task_reap(&fn->task);
 436         }
 437         free(s->fns);
 438         s->fns = NULL;
 439 }
 440
 441 static void notify_receivers(int error)
 442 {
 443         int i;
 444
 445         FOR_EACH_SLOT(i) {
 446                 struct slot_info *s = slot + i;
 447                 if (s->format < 0)
 448                         continue;
 449                 if (!s->receiver_node)
 450                         continue;
 451                 task_notify(s->receiver_node->task, error);
 452         }
 453 }
 454
 455 static int get_empty_slot(void)
 456 {
 457         int i;
 458         struct slot_info *s;
 459
 460         FOR_EACH_SLOT(i) {
 461                 s = &slot[i];
 462                 if (s->format < 0) {
 463                         clear_slot(i);
 464                         return i;
 465                 }
 466                 if (s->wns || s->receiver_node || s->fns)
 467                         continue;
 468                 clear_slot(i);
 469                 return i;
 470         }
 471         return -E_NO_MORE_SLOTS;
 472 }
 473
 474 static void open_filters(struct slot_info *s)
 475 {
 476         struct audio_format_info *a = afi + s->format;
 477         struct filter_node *fn;
 478         int nf = a->num_filters;
 479         struct btr_node *parent;
 480         int i;
 481
 482         if (nf == 0)
 483                 return;
 484         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 485         assert(s->fns == NULL);
 486         s->fns = para_calloc(nf * sizeof(struct filter_node));
 487         parent = s->receiver_node->btrn;
 488         for (i = 0; i < nf; i++) {
 489                 char buf[20];
 490                 struct filter *f = filters + a->filter_nums[i];
 491                 fn = s->fns + i;
 492                 fn->filter_num = a->filter_nums[i];
 493                 fn->conf = a->filter_conf[i];
 494                 fn->btrn = btr_new_node(&(struct btr_node_description)
 495                         EMBRACE(.name = f->name, .parent = parent,
 496                                 .handler = f->execute, .context = fn));
 497
 498                 f->open(fn);
 499                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 500                 fn->task = task_register(&(struct task_info) {
 501                         .name = buf,
 502                         .pre_select = f->pre_select,
 503                         .post_select = f->post_select,
 504                         .context = fn,
 505                 }, &sched);
 506                 parent = fn->btrn;
 507                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 508                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 509         }
 510 }
 511
 512 static void open_writers(struct slot_info *s)
 513 {
 514         int i;
 515         struct audio_format_info *a = afi + s->format;
 516         struct writer_node *wn;
 517         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 518
 519         assert(s->wns == NULL);
 520         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 521                 * sizeof(struct writer_node));
 522         for (i = 0; i < a->num_writers; i++) {
 523                 wn = s->wns + i;
 524                 wn->conf = a->writer_conf[i];
 525                 wn->writer_num = a->writer_nums[i];
 526                 register_writer_node(wn, parent, &sched);
 527                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 528                         writer_names[a->writer_nums[i]], (int)(s - slot));
 529         }
 530 }
 531
 532 /* returns slot num on success */
 533 static int open_receiver(int format)
 534 {
 535         struct audio_format_info *a = &afi[format];
 536         struct slot_info *s;
 537         int ret, slot_num;
 538         struct receiver *r = a->receiver;
 539         struct receiver_node *rn;
 540
 541         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 542         ret = get_empty_slot();
 543         if (ret < 0)
 544                 return ret;
 545         slot_num = ret;
 546         rn = para_calloc(sizeof(*rn));
 547         rn->receiver = r;
 548         rn->conf = a->receiver_conf;
 549         rn->btrn = btr_new_node(&(struct btr_node_description)
 550                 EMBRACE(.name = r->name, .context = rn));
 551         ret = r->open(rn);
 552         if (ret < 0) {
 553                 btr_remove_node(&rn->btrn);
 554                 free(rn);
 555                 return ret;
 556         }
 557         s = &slot[slot_num];
 558         s->format = format;
 559         s->receiver_node = rn;
 560         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 561                 audio_formats[format], r->name, slot_num);
 562         rn->task = task_register(&(struct task_info) {
 563                 .name = r->name,
 564                 .pre_select = r->pre_select,
 565                 .post_select = r->post_select,
 566                 .context = rn,
 567         }, &sched);
 568         return slot_num;
 569 }
 570
 571 static bool receiver_running(void)
 572 {
 573         int i;
 574         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 575
 576         FOR_EACH_SLOT(i) {
 577                 struct slot_info *s = &slot[i];
 578                 long unsigned ss2 = s->server_stream_start.tv_sec;
 579
 580                 if (!s->receiver_node)
 581                         continue;
 582                 if (task_status(s->receiver_node->task) >= 0)
 583                         return true;
 584                 if (ss1 == ss2)
 585                         return true;
 586         }
 587         return false;
 588 }
 589
 590 /**
 591  * Return the root node of the current buffer tree.
 592  *
 593  * This is only used for stream grabbing.
 594  *
 595  * \return \p NULL if no slot is currently active. If more than one buffer tree
 596  * exists, the node corresponding to the most recently started receiver is
 597  * returned.
 598  */
 599 struct btr_node *audiod_get_btr_root(void)
 600 {
 601         int i, newest_slot = -1;
 602         struct timeval newest_rstime = {0, 0};
 603
 604         FOR_EACH_SLOT(i) {
 605                 struct slot_info *s = &slot[i];
 606                 struct timeval rstime;
 607                 if (!s->receiver_node)
 608                         continue;
 609                 if (task_status(s->receiver_node->task) < 0)
 610                         continue;
 611                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 612                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 613                         continue;
 614                 newest_rstime = rstime;
 615                 newest_slot = i;
 616         }
 617         if (newest_slot == -1)
 618                 return NULL;
 619         return slot[newest_slot].receiver_node->btrn;
 620 }
 621
 622 /* whether a new instance of a decoder should be started. */
 623 static bool must_start_decoder(void)
 624 {
 625         int cafn = stat_task->current_audio_format_num;
 626         unsigned vs = stat_task->vss_status;
 627
 628         if (audiod_status != AUDIOD_ON)
 629                 return false;
 630         if (cafn < 0)
 631                 return false;
 632         if (!stat_task->ct)
 633                 return false;
 634         if (vs & VSS_STATUS_FLAG_NEXT)
 635                 return false;
 636         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 637                 return false;
 638         if (receiver_running())
 639                 return false;
 640         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 641                 return false;
 642         return true;
 643 }
 644
 645 static void compute_time_diff(const struct timeval *status_time)
 646 {
 647         struct timeval tmp, diff;
 648         static unsigned count;
 649         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 650         const struct timeval max_deviation = {0, 500 * 1000};
 651         const int time_smooth = 5;
 652
 653         sign = tv_diff(status_time, now, &diff);
 654 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 655 //                      sign, sa_time_diff_sign);
 656         if (!count) {
 657                 sa_time_diff_sign = sign;
 658                 stat_task->sa_time_diff = diff;
 659                 count++;
 660                 goto out;
 661         }
 662         if (count > 5) {
 663                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 664                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 665                         PARA_WARNING_LOG("time diff jump: %lims\n",
 666                                 s * tv2ms(&tmp));
 667         }
 668         count++;
 669         sa_time_diff_sign = tv_convex_combination(
 670                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 671                 count > 10? sign : sign * time_smooth, &diff,
 672                 &tmp);
 673         stat_task->sa_time_diff = tmp;
 674         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 675                 sign < 0? "-" : "+",
 676                 tv2ms(&diff),
 677                 sa_time_diff_sign < 0? "-" : "+",
 678                 tv2ms(&stat_task->sa_time_diff)
 679         );
 680 out:
 681         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 682 }
 683
 684 static int update_item(int itemnum, char *buf)
 685 {
 686         long unsigned sec, usec;
 687
 688         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 689                 return 1;
 690         free(stat_item_values[itemnum]);
 691         stat_item_values[itemnum] = para_strdup(buf);
 692         stat_client_write_item(itemnum);
 693         switch (itemnum) {
 694         case SI_STATUS_FLAGS:
 695                 stat_task->vss_status = 0;
 696                 if (strchr(buf, 'N'))
 697                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 698                 if (strchr(buf, 'P'))
 699                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 700                 break;
 701         case SI_OFFSET:
 702                 stat_task->offset_seconds = atoi(buf);
 703                 break;
 704         case SI_SECONDS_TOTAL:
 705                 stat_task->length_seconds = atoi(buf);
 706                 break;
 707         case SI_STREAM_START:
 708                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 709                         stat_task->server_stream_start.tv_sec = sec;
 710                         stat_task->server_stream_start.tv_usec = usec;
 711                 }
 712                 break;
 713         case SI_CURRENT_TIME:
 714                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 715                         struct timeval tv = {sec, usec};
 716                         compute_time_diff(&tv);
 717                 }
 718                 break;
 719         case SI_FORMAT:
 720                 stat_task->current_audio_format_num
 721                         = get_audio_format_num(buf);
 722         }
 723         return 1;
 724 }
 725
 726 static int parse_stream_command(const char *txt, char **cmd)
 727 {
 728         int ret, len;
 729         char *re, *p = strchr(txt, ':');
 730
 731         if (!p)
 732                 return -E_MISSING_COLON;
 733         *cmd = p + 1;
 734         len = p - txt;
 735         re = malloc(len + 1);
 736         strncpy(re, txt, len);
 737         re[len] = '\0';
 738         ret = get_matching_audio_format_nums(re);
 739         free(re);
 740         return ret;
 741 }
 742
 743 static int add_filter(int format, char *cmdline)
 744 {
 745         struct audio_format_info *a = &afi[format];
 746         int filter_num, nf = a->num_filters;
 747         void *cfg;
 748
 749         filter_num = check_filter_arg(cmdline, &cfg);
 750         if (filter_num < 0)
 751                 return filter_num;
 752         a->filter_conf = para_realloc(a->filter_conf,
 753                 (nf + 1) * sizeof(void *));
 754         a->filter_nums = para_realloc(a->filter_nums,
 755                 (nf + 1) * sizeof(unsigned));
 756         a->filter_nums[nf] = filter_num;
 757         a->filter_conf[nf] = cfg;
 758         a->num_filters++;
 759         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 760                 filters[filter_num].name);
 761         return filter_num;
 762 }
 763
 764 static int parse_writer_args(void)
 765 {
 766         int i, ret;
 767         char *cmd;
 768         struct audio_format_info *a;
 769
 770         for (i = 0; i < conf.writer_given; i++) {
 771                 void *wconf;
 772                 int j, nw, writer_num, af_mask;
 773
 774                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 775                 if (ret < 0)
 776                         return ret;
 777                 af_mask = ret;
 778                 FOR_EACH_AUDIO_FORMAT(j) {
 779                         a = afi + j;
 780                         if ((af_mask & (1 << j)) == 0) /* no match */
 781                                 continue;
 782                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 783                         nw = a->num_writers;
 784                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 785                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 786                         a->writer_nums[nw] = writer_num;
 787                         a->writer_conf[nw] = wconf;
 788                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 789                                 nw, writer_names[writer_num]);
 790                         a->num_writers++;
 791                 }
 792         }
 793         /* Use default writer for audio formats which are not yet set up. */
 794         FOR_EACH_AUDIO_FORMAT(i) {
 795                 void *writer_conf;
 796                 int writer_num;
 797                 a = afi + i;
 798                 if (a->num_writers > 0)
 799                         continue; /* already set up */
 800                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 801                 a->writer_nums = para_malloc(sizeof(int));
 802                 a->writer_nums[0] = writer_num;
 803                 a->writer_conf = para_malloc(sizeof(void *));
 804                 a->writer_conf[0] = writer_conf;
 805                 a->num_writers = 1;
 806                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 807                         writer_names[writer_num]);
 808         }
 809         return 1;
 810 }
 811
 812 static int parse_receiver_args(void)
 813 {
 814         int i, ret, receiver_num;
 815         char *cmd = NULL;
 816         struct audio_format_info *a;
 817
 818         for (i = conf.receiver_given - 1; i >= 0; i--) {
 819                 char *arg;
 820                 int j, af_mask;
 821
 822                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 823                 if (ret < 0)
 824                         goto out;
 825                 af_mask = ret;
 826                 FOR_EACH_AUDIO_FORMAT(j) {
 827                         a = afi + j;
 828                         if ((af_mask & (1 << j)) == 0) /* no match */
 829                                 continue;
 830                         /*
 831                          * If multiple receivers are given for this audio format, the
 832                          * last one wins and we have to free the previous receiver
 833                          * config here. Since we are iterating backwards, the winning
 834                          * receiver arg is in fact the first one given.
 835                          */
 836                         if (a->receiver_conf)
 837                                 a->receiver->free_config(a->receiver_conf);
 838                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 839                         ret = -E_RECV_SYNTAX;
 840                         if (!a->receiver_conf)
 841                                 goto out;
 842                         a->receiver = receivers + receiver_num;
 843                 }
 844         }
 845         /*
 846          * Use the first available receiver with no arguments for those audio
 847          * formats for which no receiver was specified.
 848          */
 849         cmd = para_strdup(receivers[0].name);
 850         FOR_EACH_AUDIO_FORMAT(i) {
 851                 a = &afi[i];
 852                 if (a->receiver_conf)
 853                         continue;
 854                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 855                 if (!a->receiver_conf)
 856                         return -E_RECV_SYNTAX;
 857                 a->receiver = &receivers[receiver_num];
 858         }
 859         FOR_EACH_AUDIO_FORMAT(i) {
 860                 a = afi + i;
 861                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 862                         audio_formats[i], a->receiver->name);
 863         }
 864         ret = 1;
 865 out:
 866         free(cmd);
 867         return ret;
 868 }
 869
 870 static int init_default_filters(void)
 871 {
 872         int i, ret = 1;
 873
 874         FOR_EACH_AUDIO_FORMAT(i) {
 875                 struct audio_format_info *a = &afi[i];
 876                 char *tmp;
 877                 int j;
 878
 879                 if (a->num_filters)
 880                         continue; /* no default -- nothing to to */
 881                 /*
 882                  * udp and dccp streams are fec-encoded, so add fecdec as the
 883                  * first filter.
 884                  */
 885                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 886                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 887                         tmp = para_strdup("fecdec");
 888                         add_filter(i, tmp);
 889                         free(tmp);
 890                         if (ret < 0)
 891                                 goto out;
 892                 }
 893                 /* add "dec" to audio format name */
 894                 tmp = make_message("%sdec", audio_formats[i]);
 895                 for (j = 0; filters[j].name; j++)
 896                         if (!strcmp(tmp, filters[j].name))
 897                                 break;
 898                 free(tmp);
 899                 ret = -E_UNSUPPORTED_FILTER;
 900                 if (!filters[j].name)
 901                         goto out;
 902                 tmp = para_strdup(filters[j].name);
 903                 ret = add_filter(i, tmp);
 904                 free(tmp);
 905                 if (ret < 0)
 906                         goto out;
 907                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 908                         filters[j].name);
 909         }
 910 out:
 911         return ret;
 912 }
 913
 914 static int parse_filter_args(void)
 915 {
 916         int i, j, ret, af_mask, num_matches;
 917
 918         for (i = 0; i < conf.filter_given; i++) {
 919                 char *arg;
 920                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 921                 if (ret < 0)
 922                         goto out;
 923                 af_mask = ret;
 924                 num_matches = 0;
 925                 FOR_EACH_AUDIO_FORMAT(j) {
 926                         if ((af_mask & (1 << j)) == 0) /* no match */
 927                                 continue;
 928                         ret = add_filter(j, arg);
 929                         if (ret < 0)
 930                                 goto out;
 931                         num_matches++;
 932                 }
 933                 if (num_matches == 0)
 934                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 935                                 conf.filter_arg[i]);
 936         }
 937         ret = init_default_filters(); /* use default values for the rest */
 938 out:
 939         return ret;
 940 }
 941
 942 static int parse_stream_args(void)
 943 {
 944         int ret;
 945
 946         ret = parse_receiver_args();
 947         if (ret < 0)
 948                 return ret;
 949         ret = parse_filter_args();
 950         if (ret < 0)
 951                 return ret;
 952         ret = parse_writer_args();
 953         if (ret < 0)
 954                 return ret;
 955         return 1;
 956 }
 957
 958 /* does not unlink socket on errors */
 959 static int audiod_get_socket(void)
 960 {
 961         int ret, fd;
 962
 963         if (conf.socket_given)
 964                 socket_name = para_strdup(conf.socket_arg);
 965         else {
 966                 char *hn = para_hostname();
 967                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 968                         hn);
 969                 free(hn);
 970         }
 971         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 972         if (conf.force_given)
 973                 unlink(socket_name);
 974         ret = create_local_socket(socket_name,
 975                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 976         if (ret < 0)
 977                 goto err;
 978         fd = ret;
 979         if (listen(fd , 5) < 0) {
 980                 ret = -ERRNO_TO_PARA_ERROR(errno);
 981                 goto err;
 982         }
 983         ret = mark_fd_nonblocking(fd);
 984         if (ret < 0)
 985                 goto err;
 986         return fd;
 987 err:
 988         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 989         exit(EXIT_FAILURE);
 990 }
 991
 992 static void signal_pre_select(struct sched *s, void *context)
 993 {
 994         struct signal_task *st = context;
 995         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 996 }
 997
 998 static int signal_post_select(struct sched *s, void *context)
 999 {
1000         struct signal_task *st = context;
1001         int ret, signum;
1002
1003         ret = task_get_notification(st->task);
1004         if (ret < 0)
1005                 return ret;
1006         signum = para_next_signal(&s->rfds);
1007         switch (signum) {
1008         case SIGINT:
1009         case SIGTERM:
1010         case SIGHUP:
1011                 PARA_NOTICE_LOG("received signal %d\n", signum);
1012                 task_notify_all(s, E_AUDIOD_SIGNAL);
1013                 return -E_AUDIOD_SIGNAL;
1014         }
1015         return 0;
1016 }
1017
1018 static void command_pre_select(struct sched *s, void *context)
1019 {
1020         struct command_task *ct = context;
1021         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1022 }
1023
1024 static int command_post_select(struct sched *s, void *context)
1025 {
1026         int ret;
1027         struct command_task *ct = context;
1028         static struct timeval last_status_dump;
1029         struct timeval tmp, delay;
1030         bool force = true;
1031
1032         ret = task_get_notification(ct->task);
1033         if (ret < 0)
1034                 return ret;
1035         ret = handle_connect(ct->fd, &s->rfds);
1036         if (ret < 0) {
1037                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1038                 if (ret == -E_AUDIOD_TERM) {
1039                         task_notify_all(s, -ret);
1040                         return ret;
1041                 }
1042         } else if (ret > 0)
1043                 goto dump;
1044
1045         /* if last status dump was less than 500ms ago, do nothing */
1046         delay.tv_sec = 0;
1047         delay.tv_usec = 500 * 1000;
1048         tv_add(&last_status_dump, &delay, &tmp);
1049         if (tv_diff(now, &tmp, NULL) < 0)
1050                 return 0;
1051
1052         /*
1053          * If last status dump was more than 5s ago, force update. Otherwise,
1054          * update only those items that have changed.
1055          */
1056         delay.tv_sec = 5;
1057         delay.tv_usec = 0;
1058         tv_add(&last_status_dump, &delay, &tmp);
1059         if (tv_diff(now, &tmp, NULL) < 0)
1060                 force = false;
1061 dump:
1062         audiod_status_dump(force);
1063         last_status_dump = *now;
1064         return 1;
1065 }
1066
1067 static void init_command_task(struct command_task *ct)
1068 {
1069         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1070
1071         ct->task = task_register(&(struct task_info) {
1072                 .name = "command",
1073                 .pre_select = command_pre_select,
1074                 .post_select = command_post_select,
1075                 .context = ct,
1076         }, &sched);
1077 }
1078
1079 static void close_stat_pipe(void)
1080 {
1081         if (!stat_task->ct)
1082                 return;
1083         task_reap(&stat_task->ct->task);
1084         client_close(stat_task->ct);
1085         stat_task->ct = NULL;
1086         clear_and_dump_items();
1087         stat_task->length_seconds = 0;
1088         stat_task->offset_seconds = 0;
1089         stat_task->vss_status = 0;
1090         stat_task->current_audio_format_num = -1;
1091         audiod_status_dump(true);
1092 }
1093
1094 /* avoid busy loop if server is down */
1095 static void set_stat_task_restart_barrier(unsigned seconds)
1096 {
1097         struct timeval delay = {seconds, 0};
1098         tv_add(now, &delay, &stat_task->restart_barrier);
1099 }
1100
1101 static bool must_close_slot(int slot_num)
1102 {
1103         struct slot_info *s = &slot[slot_num];
1104         struct audio_format_info *a = afi + s->format;
1105         int i;
1106
1107         if (s->format < 0)
1108                 return false;
1109         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1110                 return false;
1111         for (i = 0; i < a->num_filters; i++)
1112                 if (s->fns && task_status(s->fns[i].task) >= 0)
1113                         return false;
1114         if (a->num_writers > 0) {
1115                 for (i = 0; i < a->num_writers; i++)
1116                         if (s->wns && task_status(s->wns[i].task) >= 0)
1117                                 return false;
1118         } else {
1119                 if (s->wns && task_status(s->wns[0].task) >= 0)
1120                         return false;
1121         }
1122         return true;
1123 }
1124
1125 static void close_slot(int slot_num)
1126 {
1127         struct slot_info *s = slot + slot_num;
1128
1129         PARA_INFO_LOG("closing slot %d\n", slot_num);
1130         close_writers(s);
1131         close_filters(s);
1132         close_receiver(slot_num);
1133         clear_slot(slot_num);
1134 }
1135
1136 static void close_unused_slots(void)
1137 {
1138         int i;
1139
1140         FOR_EACH_SLOT(i)
1141                 if (must_close_slot(i))
1142                         close_slot(i);
1143 }
1144
1145 /*
1146  * Cleanup all resources.
1147  *
1148  * This performs various cleanups, removes the audiod socket and closes the
1149  * connection to para_server.
1150  */
1151 static void audiod_cleanup(void)
1152 {
1153         if (socket_name)
1154                 unlink(socket_name);
1155         close_stat_pipe();
1156         close_unused_slots();
1157         audiod_cmdline_parser_free(&conf);
1158         close_stat_clients();
1159 }
1160
1161 /*
1162  * Check if any receivers/filters/writers need to be started and do so if
1163  * necessary.
1164  */
1165 static void start_stop_decoders(void)
1166 {
1167         int ret;
1168         struct slot_info *sl;
1169
1170         close_unused_slots();
1171         if (audiod_status != AUDIOD_ON ||
1172                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1173                 return notify_receivers(E_NOT_PLAYING);
1174         if (!must_start_decoder())
1175                 return;
1176         ret = open_receiver(stat_task->current_audio_format_num);
1177         if (ret < 0) {
1178                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1179                 return;
1180         }
1181         sl = slot + ret;
1182         open_filters(sl);
1183         open_writers(sl);
1184         activate_grab_clients(&sched);
1185         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1186 }
1187
1188 static void status_pre_select(struct sched *s, void *context)
1189 {
1190         struct status_task *st = context;
1191         int i, ret, cafn = stat_task->current_audio_format_num;
1192
1193         if (must_start_decoder())
1194                 goto min_delay;
1195         FOR_EACH_SLOT(i)
1196                 if (must_close_slot(i))
1197                         goto min_delay;
1198         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1199         if (ret > 0)
1200                 goto min_delay;
1201         if (st->ct && audiod_status == AUDIOD_OFF)
1202                 goto min_delay;
1203         if (!st->ct && audiod_status != AUDIOD_OFF)
1204                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1205         if (cafn >= 0)
1206                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1207         /*
1208          * If para_server is playing we'd like to have a smooth time display
1209          * even if we are running in standby mode. So we request a timeout that
1210          * expires at the next full second.
1211          */
1212         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1213                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1214         return;
1215 min_delay:
1216         sched_min_delay(s);
1217 }
1218
1219 /* restart the client task if necessary */
1220 static int status_post_select(struct sched *s, void *context)
1221 {
1222         struct status_task *st = context;
1223         int ret;
1224
1225         ret = task_get_notification(st->task);
1226         if (ret < 0)
1227                 return ret;
1228         if (audiod_status == AUDIOD_OFF) {
1229                 if (!st->ct)
1230                         goto out;
1231                 if (task_status(st->ct->task) >= 0) {
1232                         task_notify(st->ct->task, E_AUDIOD_OFF);
1233                         goto out;
1234                 }
1235                 close_stat_pipe();
1236                 st->clock_diff_count = conf.clock_diff_count_arg;
1237                 goto out;
1238         }
1239         if (st->ct) {
1240                 char *buf;
1241                 size_t sz;
1242
1243                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1244                 if (ret < 0) {
1245                         close_stat_pipe();
1246                         goto out;
1247                 }
1248                 if (st->ct->status != CL_EXECUTING)
1249                         goto out;
1250                 if (ret == 0) {
1251                         struct timeval diff;
1252                         tv_diff(now, &st->last_status_read, &diff);
1253                         if (diff.tv_sec > 61)
1254                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1255                         goto out;
1256                 }
1257                 btr_merge(st->btrn, st->min_iqs);
1258                 sz = btr_next_buffer(st->btrn, &buf);
1259                 ret = for_each_stat_item(buf, sz, update_item);
1260                 if (ret < 0) {
1261                         task_notify(st->ct->task, -ret);
1262                         goto out;
1263                 }
1264                 if (sz != ret) {
1265                         btr_consume(st->btrn, sz - ret);
1266                         st->last_status_read = *now;
1267                         st->min_iqs = 0;
1268                 } else /* current status item crosses buffers */
1269                         st->min_iqs = sz + 1;
1270                 goto out;
1271         }
1272         btr_drain(st->btrn);
1273         st->current_audio_format_num = -1;
1274         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1275                 goto out;
1276         if (st->clock_diff_count) { /* get status only one time */
1277                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1278                 int argc = 5;
1279                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1280                 st->clock_diff_count--;
1281                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1282                 set_stat_task_restart_barrier(2);
1283
1284         } else {
1285                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1286                 int argc = 4;
1287                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1288                 set_stat_task_restart_barrier(5);
1289         }
1290         free(stat_item_values[SI_BASENAME]);
1291         stat_item_values[SI_BASENAME] = para_strdup(
1292                 "no connection to para_server");
1293         stat_client_write_item(SI_BASENAME);
1294         st->last_status_read = *now;
1295 out:
1296         start_stop_decoders();
1297         return 0;
1298 }
1299
1300 static void init_status_task(struct status_task *st)
1301 {
1302         memset(st, 0, sizeof(struct status_task));
1303         st->sa_time_diff_sign = 1;
1304         st->clock_diff_count = conf.clock_diff_count_arg;
1305         st->current_audio_format_num = -1;
1306         st->btrn = btr_new_node(&(struct btr_node_description)
1307                 EMBRACE(.name = "stat"));
1308
1309         stat_task->task = task_register(&(struct task_info) {
1310                 .name = "stat",
1311                 .pre_select = status_pre_select,
1312                 .post_select = status_post_select,
1313                 .context = stat_task,
1314         }, &sched);
1315 }
1316
1317 static void set_initial_status(void)
1318 {
1319         audiod_status = AUDIOD_ON;
1320         if (!conf.mode_given)
1321                 return;
1322         if (!strcmp(conf.mode_arg, "sb")) {
1323                 audiod_status = AUDIOD_STANDBY;
1324                 return;
1325         }
1326         if (!strcmp(conf.mode_arg, "off")) {
1327                 audiod_status = AUDIOD_OFF;
1328                 return;
1329         }
1330         if (strcmp(conf.mode_arg, "on"))
1331                 PARA_WARNING_LOG("invalid mode\n");
1332 }
1333
1334 __noreturn static void print_help_and_die(void)
1335 {
1336         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1337         bool d = conf.detailed_help_given;
1338         unsigned flags;
1339
1340         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1341         ggo_print_help(&h, flags);
1342
1343         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1344         print_receiver_helps(flags);
1345         print_filter_helps(flags);
1346         print_writer_helps(flags);
1347         exit(0);
1348 }
1349
1350 /**
1351  * the main function of para_audiod
1352  *
1353  * \param argc usual argument count
1354  * \param argv usual argument vector
1355  *
1356  * \return EXIT_SUCCESS or EXIT_FAILURE
1357  *
1358  * \sa para_audiod(1)
1359  * */
1360 int main(int argc, char *argv[])
1361 {
1362         int ret, i;
1363         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1364         struct audiod_cmdline_parser_params params = {
1365                 .override = 0,
1366                 .initialize = 1,
1367                 .check_required = 0,
1368                 .check_ambiguity = 0,
1369                 .print_errors = 1
1370         };
1371
1372         valid_fd_012();
1373         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1374         daemon_set_loglevel(conf.loglevel_arg);
1375         version_handle_flag("audiod", conf.version_given);
1376         /* init receivers/filters/writers early to make help work */
1377         recv_init();
1378         filter_init();
1379         writer_init();
1380         if (conf.help_given || conf.detailed_help_given)
1381                 print_help_and_die();
1382         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1383         parse_config_or_die();
1384         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1385                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1386         init_random_seed_or_die();
1387         daemon_set_flag(DF_LOG_TIME);
1388         daemon_set_flag(DF_LOG_HOSTNAME);
1389         daemon_set_flag(DF_LOG_LL);
1390         if (conf.log_timing_given)
1391                 daemon_set_flag(DF_LOG_TIMING);
1392         if (conf.logfile_given) {
1393                 daemon_set_logfile(conf.logfile_arg);
1394                 daemon_open_log_or_die();
1395         }
1396         ret = parse_stream_args();
1397         if (ret < 0) {
1398                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399                 exit(EXIT_FAILURE);
1400         }
1401         daemon_log_welcome("para_audiod");
1402         daemon_set_start_time();
1403         set_initial_status();
1404         FOR_EACH_SLOT(i)
1405                 clear_slot(i);
1406         setup_signal_handling();
1407
1408         init_status_task(stat_task);
1409         init_command_task(cmd_task);
1410
1411         if (conf.daemon_given)
1412                 daemonize(false /* parent exits immediately */);
1413
1414         sig_task->task = task_register(&(struct task_info) {
1415                 .name = "signal",
1416                 .pre_select = signal_pre_select,
1417                 .post_select = signal_post_select,
1418                 .context = sig_task,
1419         }, &sched);
1420
1421         sched.default_timeout.tv_sec = 2;
1422         sched.default_timeout.tv_usec = 999 * 1000;
1423         ret = schedule(&sched);
1424         audiod_cleanup();
1425         sched_shutdown(&sched);
1426
1427         if (ret < 0)
1428                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1429         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1430 }