audiod.c

   1 /*
   2  * Copyright (C) 2005-2013 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c The paraslash's audio daemon. */
   8 #include <regex.h>
   9 #include <sys/types.h>
  10 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "crypt.h"
  15 #include "audiod.cmdline.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "buffer_tree.h"
  20 #include "recv.h"
  21 #include "filter.h"
  22 #include "grab_client.h"
  23 #include "client.cmdline.h"
  24 #include "client.h"
  25 #include "audiod.h"
  26 #include "net.h"
  27 #include "daemon.h"
  28 #include "string.h"
  29 #include "fd.h"
  30 #include "write.h"
  31 #include "write_common.h"
  32 #include "signal.h"
  33 #include "version.h"
  34
  35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  36 /** define the array of error lists needed by para_audiod */
  37 INIT_AUDIOD_ERRLISTS;
  38 /** define the array containing all supported audio formats */
  39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  40
  41 DEFINE_RECEIVER_ARRAY;
  42
  43 /** Defines how audiod handles one supported audio format. */
  44 struct audio_format_info {
  45         /** pointer to the receiver for this audio format */
  46         struct receiver *receiver;
  47         /** the receiver configuration */
  48         void *receiver_conf;
  49         /** the number of filters that should be activated for this audio format */
  50         unsigned int num_filters;
  51         /** Array of filter numbers to be activated. */
  52         unsigned *filter_nums;
  53         /** Pointer to the array of filter configurations. */
  54         void **filter_conf;
  55         /** the number of filters that should be activated for this audio format */
  56         unsigned int num_writers;
  57         /** Array of writer numbers to be activated. */
  58         int *writer_nums;
  59         /** pointer to the array of writer configurations */
  60         void **writer_conf;
  61         /** do not start receiver/filters/writer before this time */
  62         struct timeval restart_barrier;
  63 };
  64
  65 /**
  66  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  67  * be associated with a receiver/filter/writer triple. This array holds all
  68  * information on the status of these slots.
  69  *
  70  * \sa struct slot_info
  71  * */
  72 struct slot_info slot[MAX_STREAM_SLOTS];
  73
  74 /** The vss status flags audiod is interested in. */
  75 enum vss_status_flags {
  76         /** Whether the 'N' flag is set. */
  77         VSS_STATUS_FLAG_NEXT = 1,
  78         /** The 'P' flag is set. */
  79         VSS_STATUS_FLAG_PLAYING = 2,
  80 };
  81
  82 /**
  83  * The scheduler instance of para_audiod.
  84  *
  85  * This is needed also in audiod_command.c (for the tasks command), so it can
  86  * not be made static.
  87  */
  88 struct sched sched = {.max_fileno = 0};
  89
  90 /**
  91  * The task for obtaining para_server's status (para_client stat).
  92  *
  93  * \sa struct task, struct sched.
  94  */
  95 struct status_task {
  96         /** The associated task structure of audiod. */
  97         struct task task;
  98         /** Client data associated with the stat task. */
  99         struct client_task *ct;
 100         /** Do not restart client command until this time. */
 101         struct timeval restart_barrier;
 102         /** Last time we received status data from para_server. */
 103         struct timeval last_status_read;
 104         size_t min_iqs;
 105         /** The offset value announced by para_server. */
 106         int offset_seconds;
 107         /** The length of the current audio file as announced by para_server. */
 108         int length_seconds;
 109         /** The start of the current stream from the view of para_server. */
 110         struct timeval server_stream_start;
 111         /** The average time deviation between para_server and para_audiod. */
 112         struct timeval sa_time_diff;
 113         /** Whether client time is ahead of server time. */
 114         int sa_time_diff_sign;
 115         /** The 'P' and the 'N' flags as announced by para_server. */
 116         enum vss_status_flags vss_status;
 117         /** Number of times the clock difference is to be checked. */
 118         unsigned clock_diff_count;
 119         /** When to start the next check for clock difference. */
 120         struct timeval clock_diff_barrier;
 121         /** Number of the audio format as announced by para_server. */
 122         int current_audio_format_num;
 123         /* The status task btrn is the child of the client task. */
 124         struct btr_node *btrn;
 125 };
 126
 127 /** The array of status items sent by para_server. */
 128 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 129
 130 /**
 131  * the current mode of operation of which can be changed by the on/off/cycle
 132  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 133  */
 134 int audiod_status = AUDIOD_ON;
 135
 136 /**
 137  * the gengetopt args_info struct that holds information on all command line
 138  * arguments
 139  */
 140 struct audiod_args_info conf;
 141
 142 static char *socket_name;
 143 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 144
 145 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 146
 147 static struct status_task status_task_struct;
 148
 149 /**
 150  * the task that calls the status command of para_server
 151  *
 152  * \sa struct status_task
 153  */
 154 static struct status_task *stat_task = &status_task_struct;
 155
 156 /**
 157  * the task for handling audiod commands
 158  *
 159  * \sa struct task, struct sched
 160  */
 161 struct command_task {
 162         /** the local listening socket */
 163         int fd;
 164         /** the associated task structure */
 165         struct task task;
 166 };
 167
 168 /** iterate over all supported audio formats */
 169 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 170
 171 /**
 172  * Get the audio format number.
 173  *
 174  * \param name The name of the audio format.
 175  *
 176  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 177  * \a name is not a supported audio format.
 178  */
 179 static int get_audio_format_num(const char *name)
 180 {
 181         int i;
 182
 183         while (para_isspace(*name))
 184                 name++;
 185         FOR_EACH_AUDIO_FORMAT(i)
 186                 if (!strcmp(name, audio_formats[i]))
 187                         return i;
 188         return -E_UNSUPPORTED_AUDIO_FORMAT;
 189 }
 190
 191 static int get_matching_audio_format_nums(const char *re)
 192 {
 193         int i, ret;
 194         regex_t preg;
 195
 196         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 197         if (ret < 0)
 198                 return ret;
 199         ret = 0;
 200         FOR_EACH_AUDIO_FORMAT(i)
 201                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 202                         ret |= (1 << i);
 203         regfree(&preg);
 204         return ret;
 205 }
 206
 207 /**
 208  * Compute the play time based on information of the given slot.
 209  *
 210  * \param slot_num The slot number (negative means: no slot).
 211  *
 212  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 213  * from the status items received from para_server and the start time of the
 214  * (first) writer of the given slot.
 215  *
 216  * It has to to take into account that probably the stream was not started at
 217  * the beginning of the file, that the clock between the server and the client
 218  * host may differ and that playback of the stream was delayed, e.g. because
 219  * the prebuffer filter is used in the filter configuration of the given slot.
 220  *
 221  * If no writer is active in the given slot, or \a slot_num is negative
 222  * (indicating that para_audiod runs in standby mode), an approximation based
 223  * only on the status items is computed and the returned string is prefixed
 224  * with "~".
 225  *
 226  * \return A string that must be freed by the caller.
 227  */
 228 char *get_time_string(int slot_num)
 229 {
 230         int ret, seconds = 0, length;
 231         struct timeval *tmp, sum, sss, /* server stream start */
 232                 rstime, /* receiver start time */
 233                 wstime, /* writer start time */
 234                 wtime, /* now - writer start */
 235                 rskip; /* receiver start - sss */
 236         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 237         char *msg;
 238
 239         if (audiod_status == AUDIOD_OFF)
 240                 goto empty;
 241         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 242                 if (stat_task->length_seconds) /* paused */
 243                         return NULL;
 244                 goto empty; /* stopped */
 245         }
 246         if (audiod_status == AUDIOD_ON && !s)
 247                 goto empty;
 248         /*
 249          * Valid status items and playing, set length and tmp to the stream
 250          * start. We use the slot info and fall back to the info from current
 251          * status items if no slot info is available.
 252          */
 253         length = stat_task->length_seconds;
 254         tmp = &stat_task->server_stream_start;
 255         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 256                 btr_get_node_start(s->wns[0].btrn, &wstime);
 257                 if (wstime.tv_sec != 0) { /* writer wrote something */
 258                         if (s->server_stream_start.tv_sec == 0) {
 259                                 /* copy status info to slot */
 260                                 s->server_stream_start = stat_task->server_stream_start;
 261                                 s->offset_seconds = stat_task->offset_seconds;
 262                                 s->seconds_total = stat_task->length_seconds;
 263                         }
 264                         length = s->seconds_total;
 265                         tmp = &s->server_stream_start;
 266                 }
 267         }
 268         if (stat_task->sa_time_diff_sign > 0)
 269                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 270         else
 271                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 272         if (!s || !s->wns || !s->wns[0].btrn) {
 273                 struct timeval diff;
 274                 tv_diff(now, &sss, &diff);
 275                 seconds = diff.tv_sec + stat_task->offset_seconds;
 276                 goto out;
 277         }
 278         tv_diff(now, &wstime, &wtime);
 279         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 280         seconds = s->offset_seconds;
 281         if (s->receiver_node->btrn) {
 282                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 283                 ret = tv_diff(&rstime, &sss, &rskip);
 284                 if (ret > 0) { /* audiod was started in the middle of the stream */
 285                         tv_add(&wtime, &rskip, &sum);
 286                         seconds += sum.tv_sec;
 287                 } else
 288                         seconds += wtime.tv_sec;
 289         } else
 290                 seconds += wtime.tv_sec;
 291 out:
 292         seconds = PARA_MIN(seconds, length);
 293         seconds = PARA_MAX(seconds, 0);
 294         msg = make_message(
 295                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 296                 s? "" : "~",
 297                 seconds / 60,
 298                 seconds % 60,
 299                 (length - seconds) / 60,
 300                 (length - seconds) % 60,
 301                 length? (seconds * 100 + length / 2) / length : 0,
 302                 length / 60,
 303                 length % 60
 304         );
 305         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 306         return msg;
 307 empty:
 308         return para_strdup(NULL);
 309 }
 310
 311 static int want_colors(void)
 312 {
 313         if (conf.color_arg == color_arg_no)
 314                 return 0;
 315         if (conf.color_arg == color_arg_yes)
 316                 return 1;
 317         if (conf.logfile_given)
 318                 return 0;
 319         return isatty(STDERR_FILENO);
 320 }
 321
 322 static void parse_config_or_die(void)
 323 {
 324         int ret;
 325         char *config_file;
 326         struct audiod_cmdline_parser_params params = {
 327                 .override = 0,
 328                 .initialize = 0,
 329                 .check_required = 1,
 330                 .check_ambiguity = 0,
 331                 .print_errors = 1
 332         };
 333
 334         if (conf.config_file_given)
 335                 config_file = para_strdup(conf.config_file_arg);
 336         else {
 337                 char *home = para_homedir();
 338                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 339                 free(home);
 340         }
 341         ret = file_exists(config_file);
 342         if (conf.config_file_given && !ret) {
 343                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 344                 goto err;
 345         }
 346         if (ret) {
 347                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 348                 daemon_set_loglevel(conf.loglevel_arg);
 349         }
 350         free(config_file);
 351         return;
 352 err:
 353         free(config_file);
 354         exit(EXIT_FAILURE);
 355 }
 356
 357 static void setup_signal_handling(void)
 358 {
 359         sig_task->fd = para_signal_init();
 360         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 361         para_install_sighandler(SIGINT);
 362         para_install_sighandler(SIGTERM);
 363         para_install_sighandler(SIGHUP);
 364         para_sigaction(SIGPIPE, SIG_IGN);
 365 }
 366
 367 static void clear_slot(int slot_num)
 368 {
 369         struct slot_info *s = &slot[slot_num];
 370
 371         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 372         memset(s, 0, sizeof(struct slot_info));
 373         s->format = -1;
 374 }
 375
 376 static void close_receiver(int slot_num)
 377 {
 378         struct slot_info *s = &slot[slot_num];
 379         struct audio_format_info *a;
 380
 381         if (s->format < 0 || !s->receiver_node)
 382                 return;
 383         a = &afi[s->format];
 384         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 385                 audio_formats[s->format], slot_num);
 386         a->receiver->close(s->receiver_node);
 387         btr_remove_node(&s->receiver_node->btrn);
 388         free(s->receiver_node);
 389         s->receiver_node = NULL;
 390         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 391                 &a->restart_barrier);
 392 }
 393
 394 static void writer_cleanup(struct writer_node *wn)
 395 {
 396         struct writer *w;
 397
 398         if (!wn)
 399                 return;
 400         w = writers + wn->writer_num;
 401         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 402         w->close(wn);
 403         btr_remove_node(&wn->btrn);
 404 }
 405
 406 static void close_writers(struct slot_info *s)
 407 {
 408         struct audio_format_info *a;
 409         int i;
 410
 411         if (s->format < 0)
 412                 return;
 413         assert(s->wns);
 414         a = afi + s->format;
 415         if (a->num_writers == 0)
 416                 writer_cleanup(s->wns);
 417         else {
 418                 for (i = 0; i < a->num_writers; i++)
 419                         writer_cleanup(s->wns + i);
 420         }
 421         free(s->wns);
 422         s->wns = NULL;
 423 }
 424
 425 static void close_filters(struct slot_info *s)
 426 {
 427         int i;
 428         struct audio_format_info *a = afi + s->format;
 429         if (a->num_filters == 0)
 430                 return;
 431         for (i = a->num_filters - 1; i >= 0; i--) {
 432                 struct filter_node *fn = s->fns + i;
 433                 struct filter *f;
 434
 435                 if (!fn)
 436                         continue;
 437                 f = filters + fn->filter_num;
 438                 if (f->close)
 439                         f->close(fn);
 440                 btr_remove_node(&fn->btrn);
 441         }
 442         free(s->fns);
 443         s->fns = NULL;
 444 }
 445
 446 static void notify_receivers(int error)
 447 {
 448         int i;
 449
 450         FOR_EACH_SLOT(i) {
 451                 struct slot_info *s = slot + i;
 452                 if (s->format < 0)
 453                         continue;
 454                 if (!s->receiver_node)
 455                         continue;
 456                 task_notify(&s->receiver_node->task, error);
 457         }
 458 }
 459
 460 static int get_empty_slot(void)
 461 {
 462         int i;
 463         struct slot_info *s;
 464
 465         FOR_EACH_SLOT(i) {
 466                 s = &slot[i];
 467                 if (s->format < 0) {
 468                         clear_slot(i);
 469                         return i;
 470                 }
 471                 if (s->wns || s->receiver_node || s->fns)
 472                         continue;
 473                 clear_slot(i);
 474                 return i;
 475         }
 476         return -E_NO_MORE_SLOTS;
 477 }
 478
 479 static void open_filters(struct slot_info *s)
 480 {
 481         struct audio_format_info *a = afi + s->format;
 482         struct filter_node *fn;
 483         int nf = a->num_filters;
 484         struct btr_node *parent;
 485         int i;
 486
 487         if (nf == 0)
 488                 return;
 489         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 490         assert(s->fns == NULL);
 491         s->fns = para_calloc(nf * sizeof(struct filter_node));
 492         parent = s->receiver_node->btrn;
 493         for (i = 0; i < nf; i++) {
 494                 struct filter *f = filters + a->filter_nums[i];
 495                 fn = s->fns + i;
 496                 fn->filter_num = a->filter_nums[i];
 497                 fn->conf = a->filter_conf[i];
 498                 fn->task.pre_select = f->pre_select;
 499                 fn->task.post_select = f->post_select;
 500                 fn->btrn = btr_new_node(&(struct btr_node_description)
 501                         EMBRACE(.name = f->name, .parent = parent,
 502                                 .handler = f->execute, .context = fn));
 503
 504                 f->open(fn);
 505                 register_task(&sched, &fn->task);
 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                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 510         }
 511 }
 512
 513 static void open_writers(struct slot_info *s)
 514 {
 515         int i;
 516         struct audio_format_info *a = afi + s->format;
 517         struct writer_node *wn;
 518         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 519
 520         assert(s->wns == NULL);
 521         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 522                 * sizeof(struct writer_node));
 523         for (i = 0; i < a->num_writers; i++) {
 524                 wn = s->wns + i;
 525                 wn->conf = a->writer_conf[i];
 526                 wn->writer_num = a->writer_nums[i];
 527                 register_writer_node(wn, parent, &sched);
 528                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 529                         writer_names[a->writer_nums[i]], (int)(s - slot));
 530         }
 531 }
 532
 533 /* returns slot num on success */
 534 static int open_receiver(int format)
 535 {
 536         struct audio_format_info *a = &afi[format];
 537         struct slot_info *s;
 538         int ret, slot_num;
 539         struct receiver *r = a->receiver;
 540         struct receiver_node *rn;
 541
 542         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 543         ret = get_empty_slot();
 544         if (ret < 0)
 545                 return ret;
 546         slot_num = ret;
 547         rn = para_calloc(sizeof(*rn));
 548         rn->receiver = r;
 549         rn->conf = a->receiver_conf;
 550         rn->btrn = btr_new_node(&(struct btr_node_description)
 551                 EMBRACE(.name = r->name, .context = rn));
 552         ret = r->open(rn);
 553         if (ret < 0) {
 554                 btr_remove_node(&rn->btrn);
 555                 free(rn);
 556                 return ret;
 557         }
 558         s = &slot[slot_num];
 559         s->format = format;
 560         s->receiver_node = rn;
 561         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 562                 audio_formats[format], r->name, slot_num);
 563         rn->task.pre_select = r->pre_select;
 564         rn->task.post_select = r->post_select;
 565         sprintf(rn->task.status, "%s receiver node", r->name);
 566         register_task(&sched, &rn->task);
 567         return slot_num;
 568 }
 569
 570 static bool receiver_running(void)
 571 {
 572         int i;
 573         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 574
 575         FOR_EACH_SLOT(i) {
 576                 struct slot_info *s = &slot[i];
 577                 long unsigned ss2 = s->server_stream_start.tv_sec;
 578
 579                 if (!s->receiver_node)
 580                         continue;
 581                 if (s->receiver_node->task.error >= 0)
 582                         return true;
 583                 if (ss1 == ss2)
 584                         return true;
 585         }
 586         return false;
 587 }
 588
 589 /**
 590  * Return the root node of the current buffer tree.
 591  *
 592  * This is only used for stream grabbing.
 593  *
 594  * \return \p NULL if no slot is currently active. If more than one buffer tree
 595  * exists, the node corresponding to the most recently started receiver is
 596  * returned.
 597  */
 598 struct btr_node *audiod_get_btr_root(void)
 599 {
 600         int i, newest_slot = -1;
 601         struct timeval newest_rstime = {0, 0};
 602
 603         FOR_EACH_SLOT(i) {
 604                 struct slot_info *s = &slot[i];
 605                 struct timeval rstime;
 606                 if (!s->receiver_node)
 607                         continue;
 608                 if (s->receiver_node->task.error < 0)
 609                         continue;
 610                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 611                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 612                         continue;
 613                 newest_rstime = rstime;
 614                 newest_slot = i;
 615         }
 616         if (newest_slot == -1)
 617                 return NULL;
 618         return slot[newest_slot].receiver_node->btrn;
 619 }
 620
 621 /* whether a new instance of a decoder should be started. */
 622 static bool must_start_decoder(void)
 623 {
 624         int cafn = stat_task->current_audio_format_num;
 625         unsigned vs = stat_task->vss_status;
 626
 627         if (audiod_status != AUDIOD_ON)
 628                 return false;
 629         if (cafn < 0)
 630                 return false;
 631         if (!stat_task->ct)
 632                 return false;
 633         if (vs & VSS_STATUS_FLAG_NEXT)
 634                 return false;
 635         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 636                 return false;
 637         if (receiver_running())
 638                 return false;
 639         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 640                 return false;
 641         return true;
 642 }
 643
 644 static unsigned compute_time_diff(const struct timeval *status_time)
 645 {
 646         struct timeval tmp, diff;
 647         static unsigned count;
 648         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 649         const struct timeval max_deviation = {0, 500 * 1000};
 650         const int time_smooth = 5;
 651
 652         if (!status_time)
 653                 return count;
 654         sign = tv_diff(status_time, now, &diff);
 655 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 656 //                      sign, sa_time_diff_sign);
 657         if (!count) {
 658                 sa_time_diff_sign = sign;
 659                 stat_task->sa_time_diff = diff;
 660                 count++;
 661                 goto out;
 662         }
 663         if (count > 5) {
 664                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 665                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 666                         PARA_WARNING_LOG("time diff jump: %lims\n",
 667                                 s * tv2ms(&tmp));
 668         }
 669         count++;
 670         sa_time_diff_sign = tv_convex_combination(
 671                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 672                 count > 10? sign : sign * time_smooth, &diff,
 673                 &tmp);
 674         stat_task->sa_time_diff = tmp;
 675         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 676                 sign < 0? "-" : "+",
 677                 tv2ms(&diff),
 678                 sa_time_diff_sign < 0? "-" : "+",
 679                 tv2ms(&stat_task->sa_time_diff)
 680         );
 681 out:
 682         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 683         return count;
 684 }
 685
 686 static int update_item(int itemnum, char *buf)
 687 {
 688         long unsigned sec, usec;
 689
 690         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 691                 return 1;
 692         free(stat_item_values[itemnum]);
 693         stat_item_values[itemnum] = para_strdup(buf);
 694         stat_client_write_item(itemnum);
 695         switch (itemnum) {
 696         case SI_STATUS_FLAGS:
 697                 stat_task->vss_status = 0;
 698                 if (strchr(buf, 'N'))
 699                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 700                 if (strchr(buf, 'P'))
 701                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 702                 break;
 703         case SI_OFFSET:
 704                 stat_task->offset_seconds = atoi(buf);
 705                 break;
 706         case SI_SECONDS_TOTAL:
 707                 stat_task->length_seconds = atoi(buf);
 708                 break;
 709         case SI_STREAM_START:
 710                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 711                         stat_task->server_stream_start.tv_sec = sec;
 712                         stat_task->server_stream_start.tv_usec = usec;
 713                 }
 714                 break;
 715         case SI_CURRENT_TIME:
 716                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 717                         struct timeval tv = {sec, usec};
 718                         compute_time_diff(&tv);
 719                 }
 720                 break;
 721         case SI_FORMAT:
 722                 stat_task->current_audio_format_num
 723                         = get_audio_format_num(buf);
 724         }
 725         return 1;
 726 }
 727
 728 static int parse_stream_command(const char *txt, char **cmd)
 729 {
 730         int ret, len;
 731         char *re, *p = strchr(txt, ':');
 732
 733         if (!p)
 734                 return -E_MISSING_COLON;
 735         *cmd = p + 1;
 736         len = p - txt;
 737         re = malloc(len + 1);
 738         strncpy(re, txt, len);
 739         re[len] = '\0';
 740         ret = get_matching_audio_format_nums(re);
 741         free(re);
 742         return ret;
 743 }
 744
 745 static int add_filter(int format, char *cmdline)
 746 {
 747         struct audio_format_info *a = &afi[format];
 748         int filter_num, nf = a->num_filters;
 749         void *cfg;
 750
 751         filter_num = check_filter_arg(cmdline, &cfg);
 752         if (filter_num < 0)
 753                 return filter_num;
 754         a->filter_conf = para_realloc(a->filter_conf,
 755                 (nf + 1) * sizeof(void *));
 756         a->filter_nums = para_realloc(a->filter_nums,
 757                 (nf + 1) * sizeof(unsigned));
 758         a->filter_nums[nf] = filter_num;
 759         a->filter_conf[nf] = cfg;
 760         a->num_filters++;
 761         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 762                 filters[filter_num].name);
 763         return filter_num;
 764 }
 765
 766 static int parse_writer_args(void)
 767 {
 768         int i, ret;
 769         char *cmd;
 770         struct audio_format_info *a;
 771
 772         for (i = 0; i < conf.writer_given; i++) {
 773                 void *wconf;
 774                 int j, nw, writer_num, af_mask;
 775
 776                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 777                 if (ret < 0)
 778                         return ret;
 779                 af_mask = ret;
 780                 FOR_EACH_AUDIO_FORMAT(j) {
 781                         a = afi + j;
 782                         if ((af_mask & (1 << j)) == 0) /* no match */
 783                                 continue;
 784                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 785                         nw = a->num_writers;
 786                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 787                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 788                         a->writer_nums[nw] = writer_num;
 789                         a->writer_conf[nw] = wconf;
 790                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 791                                 nw, writer_names[writer_num]);
 792                         a->num_writers++;
 793                 }
 794         }
 795         /* Use default writer for audio formats which are not yet set up. */
 796         FOR_EACH_AUDIO_FORMAT(i) {
 797                 void *writer_conf;
 798                 int writer_num;
 799                 a = afi + i;
 800                 if (a->num_writers > 0)
 801                         continue; /* already set up */
 802                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 803                 a->writer_nums = para_malloc(sizeof(int));
 804                 a->writer_nums[0] = writer_num;
 805                 a->writer_conf = para_malloc(sizeof(void *));
 806                 a->writer_conf[0] = writer_conf;
 807                 a->num_writers = 1;
 808                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 809                         writer_names[writer_num]);
 810         }
 811         return 1;
 812 }
 813
 814 static int parse_receiver_args(void)
 815 {
 816         int i, ret, receiver_num;
 817         char *cmd = NULL;
 818         struct audio_format_info *a;
 819
 820         for (i = conf.receiver_given - 1; i >= 0; i--) {
 821                 char *arg;
 822                 int j, af_mask;
 823
 824                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 825                 if (ret < 0)
 826                         goto out;
 827                 af_mask = ret;
 828                 FOR_EACH_AUDIO_FORMAT(j) {
 829                         a = afi + j;
 830                         if ((af_mask & (1 << j)) == 0) /* no match */
 831                                 continue;
 832                         /*
 833                          * If multiple receivers are given for this audio format, the
 834                          * last one wins and we have to free the previous receiver
 835                          * config here. Since we are iterating backwards, the winning
 836                          * receiver arg is in fact the first one given.
 837                          */
 838                         if (a->receiver_conf)
 839                                 a->receiver->free_config(a->receiver_conf);
 840                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 841                         ret = -E_RECV_SYNTAX;
 842                         if (!a->receiver_conf)
 843                                 goto out;
 844                         a->receiver = receivers + receiver_num;
 845                 }
 846         }
 847         /*
 848          * Use the first available receiver with no arguments for those audio
 849          * formats for which no receiver was specified.
 850          */
 851         cmd = para_strdup(receivers[0].name);
 852         FOR_EACH_AUDIO_FORMAT(i) {
 853                 a = &afi[i];
 854                 if (a->receiver_conf)
 855                         continue;
 856                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 857                 if (!a->receiver_conf)
 858                         return -E_RECV_SYNTAX;
 859                 a->receiver = &receivers[receiver_num];
 860         }
 861         FOR_EACH_AUDIO_FORMAT(i) {
 862                 a = afi + i;
 863                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 864                         audio_formats[i], a->receiver->name);
 865         }
 866         ret = 1;
 867 out:
 868         free(cmd);
 869         return ret;
 870 }
 871
 872 static int init_default_filters(void)
 873 {
 874         int i, ret = 1;
 875
 876         FOR_EACH_AUDIO_FORMAT(i) {
 877                 struct audio_format_info *a = &afi[i];
 878                 char *tmp;
 879                 int j;
 880
 881                 if (a->num_filters)
 882                         continue; /* no default -- nothing to to */
 883                 /*
 884                  * udp and dccp streams are fec-encoded, so add fecdec as the
 885                  * first filter.
 886                  */
 887                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 888                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 889                         tmp = para_strdup("fecdec");
 890                         add_filter(i, tmp);
 891                         free(tmp);
 892                         if (ret < 0)
 893                                 goto out;
 894                 }
 895                 /* add "dec" to audio format name */
 896                 tmp = make_message("%sdec", audio_formats[i]);
 897                 for (j = 0; filters[j].name; j++)
 898                         if (!strcmp(tmp, filters[j].name))
 899                                 break;
 900                 free(tmp);
 901                 ret = -E_UNSUPPORTED_FILTER;
 902                 if (!filters[j].name)
 903                         goto out;
 904                 tmp = para_strdup(filters[j].name);
 905                 ret = add_filter(i, tmp);
 906                 free(tmp);
 907                 if (ret < 0)
 908                         goto out;
 909                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 910                         filters[j].name);
 911         }
 912 out:
 913         return ret;
 914 }
 915
 916 static int parse_filter_args(void)
 917 {
 918         int i, j, ret, af_mask, num_matches;
 919
 920         for (i = 0; i < conf.filter_given; i++) {
 921                 char *arg;
 922                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 923                 if (ret < 0)
 924                         goto out;
 925                 af_mask = ret;
 926                 num_matches = 0;
 927                 FOR_EACH_AUDIO_FORMAT(j) {
 928                         if ((af_mask & (1 << j)) == 0) /* no match */
 929                                 continue;
 930                         ret = add_filter(j, arg);
 931                         if (ret < 0)
 932                                 goto out;
 933                         num_matches++;
 934                 }
 935                 if (num_matches == 0)
 936                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 937                                 conf.filter_arg[i]);
 938         }
 939         ret = init_default_filters(); /* use default values for the rest */
 940 out:
 941         return ret;
 942 }
 943
 944 static int parse_stream_args(void)
 945 {
 946         int ret;
 947
 948         ret = parse_receiver_args();
 949         if (ret < 0)
 950                 return ret;
 951         ret = parse_filter_args();
 952         if (ret < 0)
 953                 return ret;
 954         ret = parse_writer_args();
 955         if (ret < 0)
 956                 return ret;
 957         return 1;
 958 }
 959
 960 /* does not unlink socket on errors */
 961 static int audiod_get_socket(void)
 962 {
 963         struct sockaddr_un unix_addr;
 964         int ret, fd;
 965
 966         if (conf.socket_given)
 967                 socket_name = para_strdup(conf.socket_arg);
 968         else {
 969                 char *hn = para_hostname();
 970                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 971                         hn);
 972                 free(hn);
 973         }
 974         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 975         if (conf.force_given)
 976                 unlink(socket_name);
 977         ret = create_local_socket(socket_name, &unix_addr,
 978                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 979         if (ret < 0)
 980                 goto err;
 981         fd = ret;
 982         if (listen(fd , 5) < 0) {
 983                 ret = -ERRNO_TO_PARA_ERROR(errno);
 984                 goto err;
 985         }
 986         ret = mark_fd_nonblocking(fd);
 987         if (ret < 0)
 988                 goto err;
 989         return fd;
 990 err:
 991         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 992         exit(EXIT_FAILURE);
 993 }
 994
 995 static void signal_pre_select(struct sched *s, struct task *t)
 996 {
 997         struct signal_task *st = container_of(t, struct signal_task, task);
 998         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 999 }
1000
1001 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1002 {
1003         int signum;
1004
1005         signum = para_next_signal(&s->rfds);
1006         switch (signum) {
1007         case SIGINT:
1008         case SIGTERM:
1009         case SIGHUP:
1010                 PARA_NOTICE_LOG("received signal %d\n", signum);
1011                 clean_exit(EXIT_FAILURE, "caught deadly signal");
1012         }
1013         return 0;
1014 }
1015
1016 static void signal_setup_default(struct signal_task *st)
1017 {
1018         st->task.pre_select = signal_pre_select;
1019         st->task.post_select = signal_post_select;
1020         sprintf(st->task.status, "signal task");
1021 }
1022
1023 static void command_pre_select(struct sched *s, struct task *t)
1024 {
1025         struct command_task *ct = container_of(t, struct command_task, task);
1026         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1027 }
1028
1029 static int command_post_select(struct sched *s, struct task *t)
1030 {
1031         int ret;
1032         struct command_task *ct = container_of(t, struct command_task, task);
1033         static struct timeval last_status_dump;
1034         struct timeval tmp, delay;
1035         bool force = true;
1036
1037         ret = handle_connect(ct->fd, &s->rfds);
1038         if (ret < 0)
1039                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1040         else if (ret > 0)
1041                 goto dump;
1042
1043         /* if last status dump was less than 500ms ago, do nothing */
1044         delay.tv_sec = 0;
1045         delay.tv_usec = 500 * 1000;
1046         tv_add(&last_status_dump, &delay, &tmp);
1047         if (tv_diff(now, &tmp, NULL) < 0)
1048                 return 0;
1049
1050         /*
1051          * If last status dump was more than 5s ago, force update. Otherwise,
1052          * update only those items that have changed.
1053          */
1054         delay.tv_sec = 5;
1055         delay.tv_usec = 0;
1056         tv_add(&last_status_dump, &delay, &tmp);
1057         if (tv_diff(now, &tmp, NULL) < 0)
1058                 force = false;
1059 dump:
1060         audiod_status_dump(force);
1061         last_status_dump = *now;
1062         return 1;
1063 }
1064
1065 static void init_command_task(struct command_task *ct)
1066 {
1067         ct->task.pre_select = command_pre_select;
1068         ct->task.post_select = command_post_select;
1069         ct->task.error = 0;
1070         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1071         sprintf(ct->task.status, "command task");
1072 }
1073
1074 static void close_stat_pipe(void)
1075 {
1076         if (!stat_task->ct)
1077                 return;
1078         client_close(stat_task->ct);
1079         stat_task->ct = NULL;
1080         clear_and_dump_items();
1081         stat_task->length_seconds = 0;
1082         stat_task->offset_seconds = 0;
1083         stat_task->vss_status = 0;
1084         stat_task->current_audio_format_num = -1;
1085         audiod_status_dump(true);
1086 }
1087
1088 /* avoid busy loop if server is down */
1089 static void set_stat_task_restart_barrier(unsigned seconds)
1090 {
1091         struct timeval delay = {seconds, 0};
1092         tv_add(now, &delay, &stat_task->restart_barrier);
1093 }
1094
1095 static bool must_close_slot(int slot_num)
1096 {
1097         struct slot_info *s = &slot[slot_num];
1098         struct audio_format_info *a = afi + s->format;
1099         int i;
1100
1101         if (s->format < 0)
1102                 return false;
1103         if (s->receiver_node && s->receiver_node->task.error >= 0)
1104                 return false;
1105         for (i = 0; i < a->num_filters; i++)
1106                 if (s->fns && s->fns[i].task.error >= 0)
1107                         return false;
1108         if (a->num_writers > 0) {
1109                 for (i = 0; i < a->num_writers; i++)
1110                         if (s->wns && s->wns[i].task.error >= 0)
1111                                 return false;
1112         } else {
1113                 if (s->wns && s->wns[0].task.error >= 0)
1114                         return false;
1115         }
1116         return true;
1117 }
1118
1119 static void close_slot(int slot_num)
1120 {
1121         struct slot_info *s = slot + slot_num;
1122
1123         PARA_INFO_LOG("closing slot %d\n", slot_num);
1124         close_writers(s);
1125         close_filters(s);
1126         close_receiver(slot_num);
1127         clear_slot(slot_num);
1128 }
1129
1130 static void close_unused_slots(void)
1131 {
1132         int i;
1133
1134         FOR_EACH_SLOT(i)
1135                 if (must_close_slot(i))
1136                         close_slot(i);
1137 }
1138
1139 /**
1140  * Close the connection to para_server and exit.
1141  *
1142  * \param status The exit status which is passed to exit(3).
1143  * \param msg The log message
1144  *
1145  * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1146  * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1147  * or EXIT_FAILURE.
1148  *
1149  * \sa exit(3).
1150  */
1151 void __noreturn clean_exit(int status, const char *msg)
1152 {
1153         int i;
1154
1155         if (socket_name)
1156                 unlink(socket_name);
1157         close_stat_pipe();
1158         FOR_EACH_SLOT(i)
1159                 close_slot(i);
1160         audiod_cmdline_parser_free(&conf);
1161         close_stat_clients();
1162         PARA_EMERG_LOG("%s\n", msg);
1163         exit(status);
1164 }
1165
1166 /*
1167  * Check if any receivers/filters/writers need to be started and do so if
1168  * necessary.
1169  */
1170 static void start_stop_decoders(void)
1171 {
1172         int ret;
1173         struct slot_info *sl;
1174         struct audio_format_info *a;
1175
1176         close_unused_slots();
1177         if (audiod_status != AUDIOD_ON ||
1178                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1179                 return notify_receivers(E_NOT_PLAYING);
1180         if (!must_start_decoder())
1181                 return;
1182         ret = open_receiver(stat_task->current_audio_format_num);
1183         if (ret < 0) {
1184                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1185                 return;
1186         }
1187         sl = slot + ret;
1188         a = afi + sl->format;
1189         if (a->num_filters)
1190                 open_filters(sl);
1191         open_writers(sl);
1192         activate_grab_clients(&sched);
1193         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1194 }
1195
1196 static void status_pre_select(struct sched *s, struct task *t)
1197 {
1198         struct status_task *st = container_of(t, struct status_task, task);
1199         int i, ret, cafn = stat_task->current_audio_format_num;
1200
1201         if (must_start_decoder())
1202                 goto min_delay;
1203         FOR_EACH_SLOT(i)
1204                 if (must_close_slot(i))
1205                         goto min_delay;
1206         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1207         if (ret > 0)
1208                 goto min_delay;
1209         if (st->ct && audiod_status == AUDIOD_OFF)
1210                 goto min_delay;
1211         if (!st->ct && audiod_status != AUDIOD_OFF)
1212                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1213         if (cafn >= 0)
1214                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1215         /*
1216          * If para_server is playing we'd like to have a smooth time display
1217          * even if we are running in standby mode. So we request a timeout that
1218          * expires at the next full second.
1219          */
1220         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1221                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1222         return;
1223 min_delay:
1224         sched_min_delay(s);
1225 }
1226
1227 /* restart the client task if necessary */
1228 static int status_post_select(struct sched *s, struct task *t)
1229 {
1230         struct status_task *st = container_of(t, struct status_task, task);
1231
1232         if (audiod_status == AUDIOD_OFF) {
1233                 if (!st->ct)
1234                         goto out;
1235                 if (st->ct->task.error >= 0) {
1236                         task_notify(&st->ct->task, E_AUDIOD_OFF);
1237                         goto out;
1238                 }
1239                 close_stat_pipe();
1240                 st->clock_diff_count = conf.clock_diff_count_arg;
1241                 goto out;
1242         }
1243         if (st->ct) {
1244                 char *buf;
1245                 size_t sz;
1246                 int ret;
1247
1248                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1249                 if (ret < 0) {
1250                         close_stat_pipe();
1251                         goto out;
1252                 }
1253                 if (st->ct->status != CL_EXECUTING)
1254                         goto out;
1255                 if (ret == 0) {
1256                         struct timeval diff;
1257                         tv_diff(now, &st->last_status_read, &diff);
1258                         if (diff.tv_sec > 61)
1259                                 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1260                         goto out;
1261                 }
1262                 btr_merge(st->btrn, st->min_iqs);
1263                 sz = btr_next_buffer(st->btrn, &buf);
1264                 ret = for_each_stat_item(buf, sz, update_item);
1265                 if (ret < 0) {
1266                         task_notify(&st->ct->task, -ret);
1267                         goto out;
1268                 }
1269                 if (sz != ret) {
1270                         btr_consume(st->btrn, sz - ret);
1271                         st->last_status_read = *now;
1272                         st->min_iqs = 0;
1273                 } else /* current status item crosses buffers */
1274                         st->min_iqs = sz + 1;
1275                 goto out;
1276         }
1277         btr_drain(st->btrn);
1278         st->current_audio_format_num = -1;
1279         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1280                 goto out;
1281         if (st->clock_diff_count) { /* get status only one time */
1282                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1283                 int argc = 5;
1284                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1285                 st->clock_diff_count--;
1286                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1287                 set_stat_task_restart_barrier(2);
1288
1289         } else {
1290                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1291                 int argc = 4;
1292                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1293                 set_stat_task_restart_barrier(5);
1294         }
1295         free(stat_item_values[SI_BASENAME]);
1296         stat_item_values[SI_BASENAME] = para_strdup(
1297                 "no connection to para_server");
1298         stat_client_write_item(SI_BASENAME);
1299         st->last_status_read = *now;
1300 out:
1301         start_stop_decoders();
1302         return 0;
1303 }
1304
1305 static void init_status_task(struct status_task *st)
1306 {
1307         memset(st, 0, sizeof(struct status_task));
1308         st->task.pre_select = status_pre_select;
1309         st->task.post_select = status_post_select;
1310         st->sa_time_diff_sign = 1;
1311         st->clock_diff_count = conf.clock_diff_count_arg;
1312         st->current_audio_format_num = -1;
1313         sprintf(st->task.status, "stat");
1314         st->btrn = btr_new_node(&(struct btr_node_description)
1315                 EMBRACE(.name = "stat"));
1316 }
1317
1318 static void set_initial_status(void)
1319 {
1320         audiod_status = AUDIOD_ON;
1321         if (!conf.mode_given)
1322                 return;
1323         if (!strcmp(conf.mode_arg, "sb")) {
1324                 audiod_status = AUDIOD_STANDBY;
1325                 return;
1326         }
1327         if (!strcmp(conf.mode_arg, "off")) {
1328                 audiod_status = AUDIOD_OFF;
1329                 return;
1330         }
1331         if (strcmp(conf.mode_arg, "on"))
1332                 PARA_WARNING_LOG("invalid mode\n");
1333 }
1334
1335 __noreturn static void print_help_and_die(void)
1336 {
1337         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1338         bool d = conf.detailed_help_given;
1339         unsigned flags;
1340
1341         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1342         ggo_print_help(&h, flags);
1343
1344         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1345         print_receiver_helps(flags);
1346         print_filter_helps(flags);
1347         print_writer_helps(flags);
1348         exit(0);
1349 }
1350
1351 static void init_colors_or_die(void)
1352 {
1353         int i;
1354
1355         if (!want_colors())
1356                 return;
1357         daemon_set_default_log_colors();
1358         daemon_set_flag(DF_COLOR_LOG);
1359         for (i = 0; i < conf.log_color_given; i++)
1360                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1361 }
1362
1363 /**
1364  * the main function of para_audiod
1365  *
1366  * \param argc usual argument count
1367  * \param argv usual argument vector
1368  *
1369  * \return EXIT_SUCCESS or EXIT_FAILURE
1370  *
1371  * \sa para_audiod(1)
1372  * */
1373 int main(int argc, char *argv[])
1374 {
1375         int ret, i;
1376         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1377         struct audiod_cmdline_parser_params params = {
1378                 .override = 0,
1379                 .initialize = 1,
1380                 .check_required = 0,
1381                 .check_ambiguity = 0,
1382                 .print_errors = 1
1383         };
1384
1385         valid_fd_012();
1386         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1387         daemon_set_loglevel(conf.loglevel_arg);
1388         version_handle_flag("audiod", conf.version_given);
1389         /* init receivers/filters/writers early to make help work */
1390         recv_init();
1391         filter_init();
1392         writer_init();
1393         if (conf.help_given || conf.detailed_help_given)
1394                 print_help_and_die();
1395         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1396         parse_config_or_die();
1397         init_colors_or_die();
1398         init_random_seed_or_die();
1399         daemon_set_flag(DF_LOG_TIME);
1400         daemon_set_flag(DF_LOG_HOSTNAME);
1401         daemon_set_flag(DF_LOG_LL);
1402         if (conf.log_timing_given)
1403                 daemon_set_flag(DF_LOG_TIMING);
1404         if (conf.logfile_given) {
1405                 daemon_set_logfile(conf.logfile_arg);
1406                 daemon_open_log_or_die();
1407         }
1408         ret = parse_stream_args();
1409         if (ret < 0) {
1410                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1411                 exit(EXIT_FAILURE);
1412         }
1413         log_welcome("para_audiod");
1414         set_server_start_time(NULL);
1415         set_initial_status();
1416         FOR_EACH_SLOT(i)
1417                 clear_slot(i);
1418         setup_signal_handling();
1419         signal_setup_default(sig_task);
1420
1421         init_status_task(stat_task);
1422         init_command_task(cmd_task);
1423
1424         if (conf.daemon_given)
1425                 daemonize(false /* parent exits immediately */);
1426
1427         register_task(&sched, &sig_task->task);
1428         register_task(&sched, &cmd_task->task);
1429         register_task(&sched, &stat_task->task);
1430         sched.default_timeout.tv_sec = 2;
1431         sched.default_timeout.tv_usec = 999 * 1000;
1432         ret = schedule(&sched);
1433
1434         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1435         return EXIT_FAILURE;
1436 }