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         free(config_file);
 349         daemon_set_loglevel(conf.loglevel_arg);
 350         return;
 351 err:
 352         free(config_file);
 353         exit(EXIT_FAILURE);
 354 }
 355
 356 static void setup_signal_handling(void)
 357 {
 358         sig_task->fd = para_signal_init();
 359         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 360         para_install_sighandler(SIGINT);
 361         para_install_sighandler(SIGTERM);
 362         para_install_sighandler(SIGHUP);
 363         para_sigaction(SIGPIPE, SIG_IGN);
 364 }
 365
 366 static void clear_slot(int slot_num)
 367 {
 368         struct slot_info *s = &slot[slot_num];
 369
 370         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 371         memset(s, 0, sizeof(struct slot_info));
 372         s->format = -1;
 373 }
 374
 375 static void close_receiver(int slot_num)
 376 {
 377         struct slot_info *s = &slot[slot_num];
 378         struct audio_format_info *a;
 379
 380         if (s->format < 0 || !s->receiver_node)
 381                 return;
 382         a = &afi[s->format];
 383         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 384                 audio_formats[s->format], slot_num);
 385         a->receiver->close(s->receiver_node);
 386         btr_remove_node(&s->receiver_node->btrn);
 387         free(s->receiver_node);
 388         s->receiver_node = NULL;
 389         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 390                 &a->restart_barrier);
 391 }
 392
 393 static void writer_cleanup(struct writer_node *wn)
 394 {
 395         struct writer *w;
 396
 397         if (!wn)
 398                 return;
 399         w = writers + wn->writer_num;
 400         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 401         w->close(wn);
 402         btr_remove_node(&wn->btrn);
 403 }
 404
 405 static void close_writers(struct slot_info *s)
 406 {
 407         struct audio_format_info *a;
 408         int i;
 409
 410         if (s->format < 0)
 411                 return;
 412         assert(s->wns);
 413         a = afi + s->format;
 414         if (a->num_writers == 0)
 415                 writer_cleanup(s->wns);
 416         else {
 417                 for (i = 0; i < a->num_writers; i++)
 418                         writer_cleanup(s->wns + i);
 419         }
 420         free(s->wns);
 421         s->wns = NULL;
 422 }
 423
 424 static void close_filters(struct slot_info *s)
 425 {
 426         int i;
 427         struct audio_format_info *a = afi + s->format;
 428         if (a->num_filters == 0)
 429                 return;
 430         for (i = 0; i < a->num_filters; i++) {
 431                 struct filter_node *fn = s->fns + i;
 432                 struct filter *f;
 433
 434                 if (!fn)
 435                         continue;
 436                 f = filters + fn->filter_num;
 437                 if (f->close)
 438                         f->close(fn);
 439                 btr_remove_node(&fn->btrn);
 440         }
 441         free(s->fns);
 442         s->fns = NULL;
 443 }
 444
 445 static void notify_receivers(int error)
 446 {
 447         int i;
 448
 449         FOR_EACH_SLOT(i) {
 450                 struct slot_info *s = slot + i;
 451                 if (s->format < 0)
 452                         continue;
 453                 if (!s->receiver_node)
 454                         continue;
 455                 task_notify(&s->receiver_node->task, error);
 456         }
 457 }
 458
 459 static int get_empty_slot(void)
 460 {
 461         int i;
 462         struct slot_info *s;
 463
 464         FOR_EACH_SLOT(i) {
 465                 s = &slot[i];
 466                 if (s->format < 0) {
 467                         clear_slot(i);
 468                         return i;
 469                 }
 470                 if (s->wns || s->receiver_node || s->fns)
 471                         continue;
 472                 clear_slot(i);
 473                 return i;
 474         }
 475         return -E_NO_MORE_SLOTS;
 476 }
 477
 478 static void open_filters(struct slot_info *s)
 479 {
 480         struct audio_format_info *a = afi + s->format;
 481         struct filter_node *fn;
 482         int nf = a->num_filters;
 483         struct btr_node *parent;
 484         int i;
 485
 486         if (nf == 0)
 487                 return;
 488         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 489         assert(s->fns == NULL);
 490         s->fns = para_calloc(nf * sizeof(struct filter_node));
 491         parent = s->receiver_node->btrn;
 492         for (i = 0; i < nf; i++) {
 493                 struct filter *f = filters + a->filter_nums[i];
 494                 fn = s->fns + i;
 495                 fn->filter_num = a->filter_nums[i];
 496                 fn->conf = a->filter_conf[i];
 497                 fn->task.pre_select = f->pre_select;
 498                 if (f->new_post_select) {
 499                         fn->task.new_post_select = f->new_post_select;
 500                         fn->task.post_select = NULL;
 501                 } else {
 502                         fn->task.new_post_select = NULL;
 503                         fn->task.post_select = f->post_select;
 504                 }
 505                 fn->btrn = btr_new_node(&(struct btr_node_description)
 506                         EMBRACE(.name = f->name, .parent = parent,
 507                                 .handler = f->execute, .context = fn));
 508
 509                 f->open(fn);
 510                 register_task(&sched, &fn->task);
 511                 parent = fn->btrn;
 512                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 513                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 514                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 515         }
 516 }
 517
 518 static void open_writers(struct slot_info *s)
 519 {
 520         int i;
 521         struct audio_format_info *a = afi + s->format;
 522         struct writer_node *wn;
 523         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 524
 525         assert(s->wns == NULL);
 526         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 527                 * sizeof(struct writer_node));
 528         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 529         for (i = 0; i < a->num_writers; i++) {
 530                 wn = s->wns + i;
 531                 wn->conf = a->writer_conf[i];
 532                 wn->writer_num = a->writer_nums[i];
 533                 register_writer_node(wn, parent, &sched);
 534         }
 535 }
 536
 537 /* returns slot num on success */
 538 static int open_receiver(int format)
 539 {
 540         struct audio_format_info *a = &afi[format];
 541         struct slot_info *s;
 542         int ret, slot_num;
 543         struct receiver *r = a->receiver;
 544         struct receiver_node *rn;
 545
 546         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 547         ret = get_empty_slot();
 548         if (ret < 0)
 549                 return ret;
 550         slot_num = ret;
 551         rn = para_calloc(sizeof(*rn));
 552         rn->receiver = r;
 553         rn->conf = a->receiver_conf;
 554         rn->btrn = btr_new_node(&(struct btr_node_description)
 555                 EMBRACE(.name = r->name, .context = rn));
 556         ret = r->open(rn);
 557         if (ret < 0) {
 558                 btr_remove_node(&rn->btrn);
 559                 free(rn);
 560                 return ret;
 561         }
 562         s = &slot[slot_num];
 563         s->format = format;
 564         s->receiver_node = rn;
 565         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 566                 audio_formats[format], r->name, slot_num);
 567         rn->task.pre_select = r->pre_select;
 568         if (r->new_post_select) {
 569                 rn->task.new_post_select = r->new_post_select;
 570                 rn->task.post_select = NULL;
 571         } else {
 572                 rn->task.new_post_select = NULL;
 573                 rn->task.post_select = r->post_select;
 574         }
 575         sprintf(rn->task.status, "%s receiver node", r->name);
 576         register_task(&sched, &rn->task);
 577         return slot_num;
 578 }
 579
 580 static bool receiver_running(void)
 581 {
 582         int i;
 583         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 584
 585         FOR_EACH_SLOT(i) {
 586                 struct slot_info *s = &slot[i];
 587                 long unsigned ss2 = s->server_stream_start.tv_sec;
 588
 589                 if (!s->receiver_node)
 590                         continue;
 591                 if (s->receiver_node->task.error >= 0)
 592                         return true;
 593                 if (ss1 == ss2)
 594                         return true;
 595         }
 596         return false;
 597 }
 598
 599 /**
 600  * Return the root node of the current buffer tree.
 601  *
 602  * This is only used for stream grabbing.
 603  *
 604  * \return \p NULL if no slot is currently active. If more than one buffer tree
 605  * exists, the node corresponding to the most recently started receiver is
 606  * returned.
 607  */
 608 struct btr_node *audiod_get_btr_root(void)
 609 {
 610         int i, newest_slot = -1;
 611         struct timeval newest_rstime = {0, 0};
 612
 613         FOR_EACH_SLOT(i) {
 614                 struct slot_info *s = &slot[i];
 615                 struct timeval rstime;
 616                 if (!s->receiver_node)
 617                         continue;
 618                 if (s->receiver_node->task.error < 0)
 619                         continue;
 620                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 621                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 622                         continue;
 623                 newest_rstime = rstime;
 624                 newest_slot = i;
 625         }
 626         if (newest_slot == -1)
 627                 return NULL;
 628         return slot[newest_slot].receiver_node->btrn;
 629 }
 630
 631 /* whether a new instance of a decoder should be started. */
 632 static bool must_start_decoder(void)
 633 {
 634         int cafn = stat_task->current_audio_format_num;
 635         unsigned vs = stat_task->vss_status;
 636
 637         if (audiod_status != AUDIOD_ON)
 638                 return false;
 639         if (cafn < 0)
 640                 return false;
 641         if (!stat_task->ct)
 642                 return false;
 643         if (vs & VSS_STATUS_FLAG_NEXT)
 644                 return false;
 645         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 646                 return false;
 647         if (receiver_running())
 648                 return false;
 649         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 650                 return false;
 651         return true;
 652 }
 653
 654 static unsigned compute_time_diff(const struct timeval *status_time)
 655 {
 656         struct timeval tmp, diff;
 657         static unsigned count;
 658         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 659         const struct timeval max_deviation = {0, 500 * 1000};
 660         const int time_smooth = 5;
 661
 662         if (!status_time)
 663                 return count;
 664         sign = tv_diff(status_time, now, &diff);
 665 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 666 //                      sign, sa_time_diff_sign);
 667         if (!count) {
 668                 sa_time_diff_sign = sign;
 669                 stat_task->sa_time_diff = diff;
 670                 count++;
 671                 goto out;
 672         }
 673         if (count > 5) {
 674                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 675                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 676                         PARA_WARNING_LOG("time diff jump: %lims\n",
 677                                 s * tv2ms(&tmp));
 678         }
 679         count++;
 680         sa_time_diff_sign = tv_convex_combination(
 681                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 682                 count > 10? sign : sign * time_smooth, &diff,
 683                 &tmp);
 684         stat_task->sa_time_diff = tmp;
 685         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 686                 sign < 0? "-" : "+",
 687                 tv2ms(&diff),
 688                 sa_time_diff_sign < 0? "-" : "+",
 689                 tv2ms(&stat_task->sa_time_diff)
 690         );
 691 out:
 692         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 693         return count;
 694 }
 695
 696 static int update_item(int itemnum, char *buf)
 697 {
 698         long unsigned sec, usec;
 699
 700         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 701                 return 1;
 702         free(stat_item_values[itemnum]);
 703         stat_item_values[itemnum] = para_strdup(buf);
 704         stat_client_write_item(itemnum);
 705         switch (itemnum) {
 706         case SI_STATUS_FLAGS:
 707                 stat_task->vss_status = 0;
 708                 if (strchr(buf, 'N'))
 709                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 710                 if (strchr(buf, 'P'))
 711                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 712                 break;
 713         case SI_OFFSET:
 714                 stat_task->offset_seconds = atoi(buf);
 715                 break;
 716         case SI_SECONDS_TOTAL:
 717                 stat_task->length_seconds = atoi(buf);
 718                 break;
 719         case SI_STREAM_START:
 720                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 721                         stat_task->server_stream_start.tv_sec = sec;
 722                         stat_task->server_stream_start.tv_usec = usec;
 723                 }
 724                 break;
 725         case SI_CURRENT_TIME:
 726                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 727                         struct timeval tv = {sec, usec};
 728                         compute_time_diff(&tv);
 729                 }
 730                 break;
 731         case SI_FORMAT:
 732                 stat_task->current_audio_format_num
 733                         = get_audio_format_num(buf);
 734         }
 735         return 1;
 736 }
 737
 738 static int parse_stream_command(const char *txt, char **cmd)
 739 {
 740         int ret, len;
 741         char *re, *p = strchr(txt, ':');
 742
 743         if (!p)
 744                 return -E_MISSING_COLON;
 745         *cmd = p + 1;
 746         len = p - txt;
 747         re = malloc(len + 1);
 748         strncpy(re, txt, len);
 749         re[len] = '\0';
 750         ret = get_matching_audio_format_nums(re);
 751         free(re);
 752         return ret;
 753 }
 754
 755 static int add_filter(int format, char *cmdline)
 756 {
 757         struct audio_format_info *a = &afi[format];
 758         int filter_num, nf = a->num_filters;
 759         void *cfg;
 760
 761         filter_num = check_filter_arg(cmdline, &cfg);
 762         if (filter_num < 0)
 763                 return filter_num;
 764         a->filter_conf = para_realloc(a->filter_conf,
 765                 (nf + 1) * sizeof(void *));
 766         a->filter_nums = para_realloc(a->filter_nums,
 767                 (nf + 1) * sizeof(unsigned));
 768         a->filter_nums[nf] = filter_num;
 769         a->filter_conf[nf] = cfg;
 770         a->num_filters++;
 771         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 772                 filters[filter_num].name);
 773         return filter_num;
 774 }
 775
 776 static int parse_writer_args(void)
 777 {
 778         int i, ret;
 779         char *cmd;
 780         struct audio_format_info *a;
 781
 782         for (i = 0; i < conf.writer_given; i++) {
 783                 void *wconf;
 784                 int j, nw, writer_num, af_mask;
 785
 786                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 787                 if (ret < 0)
 788                         return ret;
 789                 af_mask = ret;
 790                 FOR_EACH_AUDIO_FORMAT(j) {
 791                         a = afi + j;
 792                         if ((af_mask & (1 << j)) == 0) /* no match */
 793                                 continue;
 794                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 795                         nw = a->num_writers;
 796                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 797                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 798                         a->writer_nums[nw] = writer_num;
 799                         a->writer_conf[nw] = wconf;
 800                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 801                                 nw, writer_names[writer_num]);
 802                         a->num_writers++;
 803                 }
 804         }
 805         /* Use default writer for audio formats which are not yet set up. */
 806         FOR_EACH_AUDIO_FORMAT(i) {
 807                 void *writer_conf;
 808                 int writer_num;
 809                 a = afi + i;
 810                 if (a->num_writers > 0)
 811                         continue; /* already set up */
 812                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 813                 a->writer_nums = para_malloc(sizeof(int));
 814                 a->writer_nums[0] = writer_num;
 815                 a->writer_conf = para_malloc(sizeof(void *));
 816                 a->writer_conf[0] = writer_conf;
 817                 a->num_writers = 1;
 818                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 819                         writer_names[writer_num]);
 820         }
 821         return 1;
 822 }
 823
 824 static int parse_receiver_args(void)
 825 {
 826         int i, ret, receiver_num;
 827         char *cmd = NULL;
 828         struct audio_format_info *a;
 829
 830         for (i = conf.receiver_given - 1; i >= 0; i--) {
 831                 char *arg;
 832                 int j, af_mask;
 833
 834                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 835                 if (ret < 0)
 836                         goto out;
 837                 af_mask = ret;
 838                 FOR_EACH_AUDIO_FORMAT(j) {
 839                         a = afi + j;
 840                         if ((af_mask & (1 << j)) == 0) /* no match */
 841                                 continue;
 842                         /*
 843                          * If multiple receivers are given for this audio format, the
 844                          * last one wins and we have to free the previous receiver
 845                          * config here. Since we are iterating backwards, the winning
 846                          * receiver arg is in fact the first one given.
 847                          */
 848                         if (a->receiver_conf)
 849                                 a->receiver->free_config(a->receiver_conf);
 850                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 851                         ret = -E_RECV_SYNTAX;
 852                         if (!a->receiver_conf)
 853                                 goto out;
 854                         a->receiver = receivers + receiver_num;
 855                 }
 856         }
 857         /*
 858          * Use the first available receiver with no arguments for those audio
 859          * formats for which no receiver was specified.
 860          */
 861         cmd = para_strdup(receivers[0].name);
 862         FOR_EACH_AUDIO_FORMAT(i) {
 863                 a = &afi[i];
 864                 if (a->receiver_conf)
 865                         continue;
 866                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 867                 if (!a->receiver_conf)
 868                         return -E_RECV_SYNTAX;
 869                 a->receiver = &receivers[receiver_num];
 870         }
 871         FOR_EACH_AUDIO_FORMAT(i) {
 872                 a = afi + i;
 873                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 874                         audio_formats[i], a->receiver->name);
 875         }
 876         ret = 1;
 877 out:
 878         free(cmd);
 879         return ret;
 880 }
 881
 882 static int init_default_filters(void)
 883 {
 884         int i, ret = 1;
 885
 886         FOR_EACH_AUDIO_FORMAT(i) {
 887                 struct audio_format_info *a = &afi[i];
 888                 char *tmp;
 889                 int j;
 890
 891                 if (a->num_filters)
 892                         continue; /* no default -- nothing to to */
 893                 /*
 894                  * udp and dccp streams are fec-encoded, so add fecdec as the
 895                  * first filter.
 896                  */
 897                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 898                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 899                         tmp = para_strdup("fecdec");
 900                         add_filter(i, tmp);
 901                         free(tmp);
 902                         if (ret < 0)
 903                                 goto out;
 904                 }
 905                 /* add "dec" to audio format name */
 906                 tmp = make_message("%sdec", audio_formats[i]);
 907                 for (j = 0; filters[j].name; j++)
 908                         if (!strcmp(tmp, filters[j].name))
 909                                 break;
 910                 free(tmp);
 911                 ret = -E_UNSUPPORTED_FILTER;
 912                 if (!filters[j].name)
 913                         goto out;
 914                 tmp = para_strdup(filters[j].name);
 915                 ret = add_filter(i, tmp);
 916                 free(tmp);
 917                 if (ret < 0)
 918                         goto out;
 919                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 920                         filters[j].name);
 921         }
 922 out:
 923         return ret;
 924 }
 925
 926 static int parse_filter_args(void)
 927 {
 928         int i, j, ret, af_mask;
 929
 930         for (i = 0; i < conf.filter_given; i++) {
 931                 char *arg;
 932                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 933                 if (ret < 0)
 934                         goto out;
 935                 af_mask = ret;
 936                 FOR_EACH_AUDIO_FORMAT(j) {
 937                         if ((af_mask & (1 << j)) == 0) /* no match */
 938                                 continue;
 939                         ret = add_filter(j, arg);
 940                         if (ret < 0)
 941                                 goto out;
 942                 }
 943         }
 944         ret = init_default_filters(); /* use default values for the rest */
 945 out:
 946         return ret;
 947 }
 948
 949 static int parse_stream_args(void)
 950 {
 951         int ret;
 952
 953         ret = parse_receiver_args();
 954         if (ret < 0)
 955                 return ret;
 956         ret = parse_filter_args();
 957         if (ret < 0)
 958                 return ret;
 959         ret = parse_writer_args();
 960         if (ret < 0)
 961                 return ret;
 962         return 1;
 963 }
 964
 965 /* does not unlink socket on errors */
 966 static int audiod_get_socket(void)
 967 {
 968         struct sockaddr_un unix_addr;
 969         int ret, fd;
 970
 971         if (conf.socket_given)
 972                 socket_name = para_strdup(conf.socket_arg);
 973         else {
 974                 char *hn = para_hostname();
 975                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 976                         hn);
 977                 free(hn);
 978         }
 979         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 980         if (conf.force_given)
 981                 unlink(socket_name);
 982         ret = create_local_socket(socket_name, &unix_addr,
 983                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 984         if (ret < 0)
 985                 goto err;
 986         fd = ret;
 987         if (listen(fd , 5) < 0) {
 988                 ret = -ERRNO_TO_PARA_ERROR(errno);
 989                 goto err;
 990         }
 991         ret = mark_fd_nonblocking(fd);
 992         if (ret < 0)
 993                 goto err;
 994         return fd;
 995 err:
 996         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 997         exit(EXIT_FAILURE);
 998 }
 999
1000 static void signal_pre_select(struct sched *s, struct task *t)
1001 {
1002         struct signal_task *st = container_of(t, struct signal_task, task);
1003         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1004 }
1005
1006 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1007 {
1008         int signum;
1009
1010         signum = para_next_signal(&s->rfds);
1011         switch (signum) {
1012         case SIGINT:
1013         case SIGTERM:
1014         case SIGHUP:
1015                 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1016                 clean_exit(EXIT_FAILURE, "caught deadly signal");
1017         }
1018         return 0;
1019 }
1020
1021 static void signal_setup_default(struct signal_task *st)
1022 {
1023         st->task.pre_select = signal_pre_select;
1024         st->task.new_post_select = signal_post_select;
1025         st->task.post_select = NULL;
1026         sprintf(st->task.status, "signal task");
1027 }
1028
1029 static void command_pre_select(struct sched *s, struct task *t)
1030 {
1031         struct command_task *ct = container_of(t, struct command_task, task);
1032         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1033 }
1034
1035 static int command_post_select(struct sched *s, struct task *t)
1036 {
1037         int ret;
1038         struct command_task *ct = container_of(t, struct command_task, task);
1039         static struct timeval last_status_dump;
1040         struct timeval tmp, delay = {0, 500 * 1000};
1041
1042         tv_add(&last_status_dump, &delay, &tmp);
1043         if (tv_diff(&tmp, now, NULL) < 0) {
1044                 audiod_status_dump();
1045                 last_status_dump = *now;
1046         }
1047
1048         ret = handle_connect(ct->fd, &s->rfds);
1049         if (ret < 0)
1050                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1051         audiod_status_dump();
1052         return 0;
1053 }
1054
1055 static void init_command_task(struct command_task *ct)
1056 {
1057         ct->task.pre_select = command_pre_select;
1058         ct->task.new_post_select = command_post_select;
1059         ct->task.post_select = NULL;
1060         ct->task.error = 0;
1061         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1062         sprintf(ct->task.status, "command task");
1063 }
1064
1065 static void close_stat_pipe(void)
1066 {
1067         if (!stat_task->ct)
1068                 return;
1069         client_close(stat_task->ct);
1070         stat_task->ct = NULL;
1071         clear_and_dump_items();
1072         stat_task->length_seconds = 0;
1073         stat_task->offset_seconds = 0;
1074         stat_task->vss_status = 0;
1075         stat_task->current_audio_format_num = -1;
1076         audiod_status_dump();
1077 }
1078
1079 /**
1080  * close the connection to para_server and exit
1081  *
1082  * \param status the exit status which is passed to exit(3)
1083  * \param msg the log message
1084  *
1085  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1086  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1087  * EXIT_FAILURE.
1088  *
1089  * \sa exit(3)
1090  */
1091 void __noreturn clean_exit(int status, const char *msg)
1092 {
1093         PARA_EMERG_LOG("%s\n", msg);
1094         if (socket_name)
1095                 unlink(socket_name);
1096         close_stat_pipe();
1097         exit(status);
1098 }
1099
1100 /* avoid busy loop if server is down */
1101 static void set_stat_task_restart_barrier(unsigned seconds)
1102 {
1103         struct timeval delay = {seconds, 0};
1104         tv_add(now, &delay, &stat_task->restart_barrier);
1105 }
1106
1107 static bool must_close_slot(int slot_num)
1108 {
1109         struct slot_info *s = &slot[slot_num];
1110         struct audio_format_info *a = afi + s->format;
1111         int i;
1112
1113         if (s->format < 0)
1114                 return false;
1115         if (s->receiver_node && s->receiver_node->task.error >= 0)
1116                 return false;
1117         for (i = 0; i < a->num_filters; i++)
1118                 if (s->fns && s->fns[i].task.error >= 0)
1119                         return false;
1120         if (a->num_writers > 0) {
1121                 for (i = 0; i < a->num_writers; i++)
1122                         if (s->wns && s->wns[i].task.error >= 0)
1123                                 return false;
1124         } else {
1125                 if (s->wns && s->wns[0].task.error >= 0)
1126                         return false;
1127         }
1128         return true;
1129 }
1130
1131 static void close_unused_slots(void)
1132 {
1133         int i;
1134
1135         FOR_EACH_SLOT(i) {
1136                 struct slot_info *s = slot + i;
1137                 if (!must_close_slot(i))
1138                         continue;
1139                 PARA_INFO_LOG("closing slot %d\n", i);
1140                 close_writers(s);
1141                 close_filters(s);
1142                 close_receiver(i);
1143                 clear_slot(i);
1144         }
1145 }
1146
1147 /*
1148  * Check if any receivers/filters/writers need to be started and do so if
1149  * necessary.
1150  */
1151 static void start_stop_decoders(void)
1152 {
1153         int ret;
1154         struct slot_info *sl;
1155         struct audio_format_info *a;
1156
1157         close_unused_slots();
1158         if (audiod_status != AUDIOD_ON ||
1159                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1160                 return notify_receivers(E_NOT_PLAYING);
1161         if (!must_start_decoder())
1162                 return;
1163         ret = open_receiver(stat_task->current_audio_format_num);
1164         if (ret < 0) {
1165                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1166                 return;
1167         }
1168         sl = slot + ret;
1169         a = afi + sl->format;
1170         if (a->num_filters)
1171                 open_filters(sl);
1172         open_writers(sl);
1173         activate_grab_clients(&sched);
1174         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1175 }
1176
1177 static void status_pre_select(struct sched *s, struct task *t)
1178 {
1179         struct status_task *st = container_of(t, struct status_task, task);
1180         int i, ret, cafn = stat_task->current_audio_format_num;
1181
1182         if (must_start_decoder())
1183                 goto min_delay;
1184         FOR_EACH_SLOT(i)
1185                 if (must_close_slot(i))
1186                         goto min_delay;
1187         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1188         if (ret > 0)
1189                 goto min_delay;
1190         if (st->ct && audiod_status == AUDIOD_OFF)
1191                 goto min_delay;
1192         if (!st->ct && audiod_status != AUDIOD_OFF)
1193                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1194         if (cafn >= 0)
1195                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1196         /*
1197          * If para_server is playing we'd like to have a smooth time display
1198          * even if we are running in standby mode. So we request a timeout that
1199          * expires at the next full second.
1200          */
1201         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1202                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1203         return;
1204 min_delay:
1205         sched_min_delay(s);
1206 }
1207
1208 /* restart the client task if necessary */
1209 static int status_post_select(struct sched *s, struct task *t)
1210 {
1211         struct status_task *st = container_of(t, struct status_task, task);
1212
1213         if (audiod_status == AUDIOD_OFF) {
1214                 if (!st->ct)
1215                         goto out;
1216                 if (st->ct->task.error >= 0) {
1217                         task_notify(&st->ct->task, E_AUDIOD_OFF);
1218                         goto out;
1219                 }
1220                 close_stat_pipe();
1221                 st->clock_diff_count = conf.clock_diff_count_arg;
1222                 goto out;
1223         }
1224         if (st->ct) {
1225                 char *buf;
1226                 size_t sz;
1227                 int ret;
1228                 if (st->ct->task.error < 0) {
1229                         close_stat_pipe();
1230                         goto out;
1231                 }
1232                 if (st->ct->status != CL_RECEIVING)
1233                         goto out;
1234                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1235                 if (ret <= 0) {
1236                         struct timeval diff;
1237                         tv_diff(now, &st->last_status_read, &diff);
1238                         if (diff.tv_sec > 61)
1239                                 task_notify(&st->ct->task, E_AUDIOD_OFF);
1240                         goto out;
1241                 }
1242                 btr_merge(st->btrn, st->min_iqs);
1243                 sz = btr_next_buffer(st->btrn, &buf);
1244                 ret = for_each_stat_item(buf, sz, update_item);
1245                 if (ret < 0) {
1246                         task_notify(&st->ct->task, E_AUDIOD_OFF);
1247                         goto out;
1248                 }
1249                 if (sz != ret) {
1250                         btr_consume(st->btrn, sz - ret);
1251                         st->last_status_read = *now;
1252                         st->min_iqs = 0;
1253                 } else /* current status item crosses buffers */
1254                         st->min_iqs = sz + 1;
1255                 goto out;
1256         }
1257         btr_drain(st->btrn);
1258         st->current_audio_format_num = -1;
1259         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1260                 goto out;
1261         if (st->clock_diff_count) { /* get status only one time */
1262                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1263                 int argc = 5;
1264                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1265                 st->clock_diff_count--;
1266                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1267                 set_stat_task_restart_barrier(2);
1268
1269         } else {
1270                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1271                 int argc = 4;
1272                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1273                 set_stat_task_restart_barrier(5);
1274         }
1275         free(stat_item_values[SI_BASENAME]);
1276         stat_item_values[SI_BASENAME] = para_strdup(
1277                 "no connection to para_server");
1278         stat_client_write_item(SI_BASENAME);
1279         st->last_status_read = *now;
1280 out:
1281         start_stop_decoders();
1282         return 0;
1283 }
1284
1285 static void init_status_task(struct status_task *st)
1286 {
1287         memset(st, 0, sizeof(struct status_task));
1288         st->task.pre_select = status_pre_select;
1289         st->task.new_post_select = status_post_select;
1290         st->task.post_select = NULL;
1291         st->sa_time_diff_sign = 1;
1292         st->clock_diff_count = conf.clock_diff_count_arg;
1293         st->current_audio_format_num = -1;
1294         sprintf(st->task.status, "stat");
1295         st->btrn = btr_new_node(&(struct btr_node_description)
1296                 EMBRACE(.name = "stat"));
1297 }
1298
1299 static void set_initial_status(void)
1300 {
1301         audiod_status = AUDIOD_ON;
1302         if (!conf.mode_given)
1303                 return;
1304         if (!strcmp(conf.mode_arg, "sb")) {
1305                 audiod_status = AUDIOD_STANDBY;
1306                 return;
1307         }
1308         if (!strcmp(conf.mode_arg, "off")) {
1309                 audiod_status = AUDIOD_OFF;
1310                 return;
1311         }
1312         if (strcmp(conf.mode_arg, "on"))
1313                 PARA_WARNING_LOG("invalid mode\n");
1314 }
1315
1316 __noreturn static void print_help_and_die(void)
1317 {
1318         int d = conf.detailed_help_given;
1319         const char **p = d? audiod_args_info_detailed_help
1320                 : audiod_args_info_help;
1321
1322         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1323                 AUDIOD_CMDLINE_PARSER_VERSION);
1324         printf_or_die("%s\n\n", audiod_args_info_usage);
1325         for (; *p; p++)
1326                 printf_or_die("%s\n", *p);
1327         print_receiver_helps(d);
1328         print_filter_helps(d);
1329         print_writer_helps(d);
1330         exit(0);
1331 }
1332
1333 static void init_colors_or_die(void)
1334 {
1335         int i;
1336
1337         if (!want_colors())
1338                 return;
1339         daemon_set_default_log_colors();
1340         daemon_set_flag(DF_COLOR_LOG);
1341         for (i = 0; i < conf.log_color_given; i++)
1342                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1343 }
1344
1345 /**
1346  * the main function of para_audiod
1347  *
1348  * \param argc usual argument count
1349  * \param argv usual argument vector
1350  *
1351  * \return EXIT_SUCCESS or EXIT_FAILURE
1352  *
1353  * \sa para_audiod(1)
1354  * */
1355 int main(int argc, char *argv[])
1356 {
1357         int ret, i;
1358         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1359         struct audiod_cmdline_parser_params params = {
1360                 .override = 0,
1361                 .initialize = 1,
1362                 .check_required = 0,
1363                 .check_ambiguity = 0,
1364                 .print_errors = 1
1365         };
1366
1367         valid_fd_012();
1368         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1369                 exit(EXIT_FAILURE);
1370         HANDLE_VERSION_FLAG("audiod", conf);
1371         /* init receivers/filters/writers early to make help work */
1372         recv_init();
1373         filter_init();
1374         writer_init();
1375         if (conf.help_given || conf.detailed_help_given)
1376                 print_help_and_die();
1377         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1378         parse_config_or_die();
1379         init_colors_or_die();
1380         init_random_seed_or_die();
1381         daemon_set_flag(DF_LOG_TIME);
1382         daemon_set_flag(DF_LOG_HOSTNAME);
1383         daemon_set_flag(DF_LOG_LL);
1384         if (conf.log_timing_given)
1385                 daemon_set_flag(DF_LOG_TIMING);
1386         if (conf.logfile_given) {
1387                 daemon_set_logfile(conf.logfile_arg);
1388                 daemon_open_log_or_die();
1389         }
1390         ret = parse_stream_args();
1391         if (ret < 0) {
1392                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1393                 exit(EXIT_FAILURE);
1394         }
1395         log_welcome("para_audiod");
1396         set_server_start_time(NULL);
1397         set_initial_status();
1398         FOR_EACH_SLOT(i)
1399                 clear_slot(i);
1400         setup_signal_handling();
1401         signal_setup_default(sig_task);
1402
1403         init_status_task(stat_task);
1404         init_command_task(cmd_task);
1405
1406         if (conf.daemon_given)
1407                 daemonize(false /* parent exits immediately */);
1408
1409         register_task(&sched, &sig_task->task);
1410         register_task(&sched, &cmd_task->task);
1411         register_task(&sched, &stat_task->task);
1412         sched.default_timeout.tv_sec = 2;
1413         sched.default_timeout.tv_usec = 999 * 1000;
1414         ret = schedule(&sched);
1415
1416         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1417         return EXIT_FAILURE;
1418 }