audiod.c

   1 /*
   2  * Copyright (C) 2005-2012 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 "recv.h"
  20 #include "buffer_tree.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 /** Defines how audiod handles one supported audio format. */
  42 struct audio_format_info {
  43         /** pointer to the receiver for this audio format */
  44         struct receiver *receiver;
  45         /** the receiver configuration */
  46         void *receiver_conf;
  47         /** the number of filters that should be activated for this audio format */
  48         unsigned int num_filters;
  49         /** Array of filter numbers to be activated. */
  50         unsigned *filter_nums;
  51         /** Pointer to the array of filter configurations. */
  52         void **filter_conf;
  53         /** the number of filters that should be activated for this audio format */
  54         unsigned int num_writers;
  55         /** Array of writer numbers to be activated. */
  56         int *writer_nums;
  57         /** pointer to the array of writer configurations */
  58         void **writer_conf;
  59         /** do not start receiver/filters/writer before this time */
  60         struct timeval restart_barrier;
  61 };
  62
  63 /**
  64  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  65  * be associated with a receiver/filter/writer triple. This array holds all
  66  * information on the status of these slots.
  67  *
  68  * \sa struct slot_info
  69  * */
  70 struct slot_info slot[MAX_STREAM_SLOTS];
  71
  72 /** The vss status flags audiod is interested in. */
  73 enum vss_status_flags {
  74         /** Whether the 'N' flag is set. */
  75         VSS_STATUS_FLAG_NEXT = 1,
  76         /** The 'P' flag is set. */
  77         VSS_STATUS_FLAG_PLAYING = 2,
  78 };
  79
  80 /**
  81  * The scheduler instance of para_audiod.
  82  *
  83  * This is needed also in audiod_command.c (for the tasks command), so it can
  84  * not be made static.
  85  */
  86 struct sched sched = {.max_fileno = 0};
  87
  88 /**
  89  * The task for obtaining para_server's status (para_client stat).
  90  *
  91  * \sa struct task, struct sched.
  92  */
  93 struct status_task {
  94         /** The associated task structure of audiod. */
  95         struct task task;
  96         /** Client data associated with the stat task. */
  97         struct client_task *ct;
  98         /** Do not restart client command until this time. */
  99         struct timeval restart_barrier;
 100         /** Last time we received status data from para_server. */
 101         struct timeval last_status_read;
 102         size_t min_iqs;
 103         /** The offset value announced by para_server. */
 104         int offset_seconds;
 105         /** The length of the current audio file as announced by para_server. */
 106         int length_seconds;
 107         /** The start of the current stream from the view of para_server. */
 108         struct timeval server_stream_start;
 109         /** The average time deviation between para_server and para_audiod. */
 110         struct timeval sa_time_diff;
 111         /** Whether client time is ahead of server time. */
 112         int sa_time_diff_sign;
 113         /** The 'P' and the 'N' flags as announced by para_server. */
 114         enum vss_status_flags vss_status;
 115         /** Number of times the clock difference is to be checked. */
 116         unsigned clock_diff_count;
 117         /** When to start the next check for clock difference. */
 118         struct timeval clock_diff_barrier;
 119         /** Number of the audio format as announced by para_server. */
 120         int current_audio_format_num;
 121         /* The status task btrn is the child of the client task. */
 122         struct btr_node *btrn;
 123 };
 124
 125 /** The array of status items sent by para_server. */
 126 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 127
 128 /**
 129  * the current mode of operation of which can be changed by the on/off/cycle
 130  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 131  */
 132 int audiod_status = AUDIOD_ON;
 133
 134 /**
 135  * the gengetopt args_info struct that holds information on all command line
 136  * arguments
 137  */
 138 struct audiod_args_info conf;
 139
 140 static char *socket_name;
 141 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 142
 143 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 144
 145 static struct status_task status_task_struct;
 146
 147 /**
 148  * the task that calls the status command of para_server
 149  *
 150  * \sa struct status_task
 151  */
 152 static struct status_task *stat_task = &status_task_struct;
 153
 154 /**
 155  * the task for handling audiod commands
 156  *
 157  * \sa struct task, struct sched
 158  */
 159 struct command_task {
 160         /** the local listening socket */
 161         int fd;
 162         /** the associated task structure */
 163         struct task task;
 164 };
 165
 166 /** iterate over all supported audio formats */
 167 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 168
 169 /**
 170  * Get the audio format number.
 171  *
 172  * \param name The name of the audio format.
 173  *
 174  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 175  * \a name is not a supported audio format.
 176  */
 177 static int get_audio_format_num(const char *name)
 178 {
 179         int i;
 180
 181         while (para_isspace(*name))
 182                 name++;
 183         FOR_EACH_AUDIO_FORMAT(i)
 184                 if (!strcmp(name, audio_formats[i]))
 185                         return i;
 186         return -E_UNSUPPORTED_AUDIO_FORMAT;
 187 }
 188
 189 static int get_matching_audio_format_nums(const char *re)
 190 {
 191         int i, ret;
 192         regex_t preg;
 193
 194         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 195         if (ret < 0)
 196                 return ret;
 197         ret = 0;
 198         FOR_EACH_AUDIO_FORMAT(i)
 199                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 200                         ret |= (1 << i);
 201         regfree(&preg);
 202         return ret;
 203 }
 204
 205 /**
 206  * Compute the play time based on information of the given slot.
 207  *
 208  * \param slot_num The slot number (negative means: no slot).
 209  *
 210  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 211  * from the status items received from para_server and the start time of the
 212  * (first) writer of the given slot.
 213  *
 214  * It has to to take into account that probably the stream was not started at
 215  * the beginning of the file, that the clock between the server and the client
 216  * host may differ and that playback of the stream was delayed, e.g. because
 217  * the prebuffer filter is used in the filter configuration of the given slot.
 218  *
 219  * If no writer is active in the given slot, or \a slot_num is negative
 220  * (indicating that para_audiod runs in standby mode), an approximation based
 221  * only on the status items is computed and the returned string is prefixed
 222  * with "~".
 223  *
 224  * \return A string that must be freed by the caller.
 225  */
 226 char *get_time_string(int slot_num)
 227 {
 228         int ret, seconds = 0, length;
 229         struct timeval *tmp, sum, sss, /* server stream start */
 230                 rstime, /* receiver start time */
 231                 wstime, /* writer start time */
 232                 wtime, /* now - writer start */
 233                 rskip; /* receiver start - sss */
 234         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 235         char *msg;
 236
 237         if (audiod_status == AUDIOD_OFF)
 238                 goto empty;
 239         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 240                 if (stat_task->length_seconds) /* paused */
 241                         return NULL;
 242                 goto empty; /* stopped */
 243         }
 244         if (audiod_status == AUDIOD_ON && !s)
 245                 goto empty;
 246         /*
 247          * Valid status items and playing, set length and tmp to the stream
 248          * start. We use the slot info and fall back to the info from current
 249          * status items if no slot info is available.
 250          */
 251         length = stat_task->length_seconds;
 252         tmp = &stat_task->server_stream_start;
 253         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 254                 btr_get_node_start(s->wns[0].btrn, &wstime);
 255                 if (wstime.tv_sec != 0) { /* writer wrote something */
 256                         if (s->server_stream_start.tv_sec == 0) {
 257                                 /* copy status info to slot */
 258                                 s->server_stream_start = stat_task->server_stream_start;
 259                                 s->offset_seconds = stat_task->offset_seconds;
 260                                 s->seconds_total = stat_task->length_seconds;
 261                         }
 262                         length = s->seconds_total;
 263                         tmp = &s->server_stream_start;
 264                 }
 265         }
 266         if (stat_task->sa_time_diff_sign > 0)
 267                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 268         else
 269                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 270         if (!s || !s->wns || !s->wns[0].btrn) {
 271                 struct timeval diff;
 272                 tv_diff(now, &sss, &diff);
 273                 seconds = diff.tv_sec + stat_task->offset_seconds;
 274                 goto out;
 275         }
 276         tv_diff(now, &wstime, &wtime);
 277         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 278         seconds = s->offset_seconds;
 279         if (s->receiver_node->btrn) {
 280                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 281                 ret = tv_diff(&rstime, &sss, &rskip);
 282                 if (ret > 0) { /* audiod was started in the middle of the stream */
 283                         tv_add(&wtime, &rskip, &sum);
 284                         seconds += sum.tv_sec;
 285                 } else
 286                         seconds += wtime.tv_sec;
 287         } else
 288                 seconds += wtime.tv_sec;
 289 out:
 290         seconds = PARA_MIN(seconds, length);
 291         seconds = PARA_MAX(seconds, 0);
 292         msg = make_message(
 293                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 294                 s? "" : "~",
 295                 seconds / 60,
 296                 seconds % 60,
 297                 (length - seconds) / 60,
 298                 (length - seconds) % 60,
 299                 length? (seconds * 100 + length / 2) / length : 0,
 300                 length / 60,
 301                 length % 60
 302         );
 303         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 304         return msg;
 305 empty:
 306         return para_strdup(NULL);
 307 }
 308
 309 static int want_colors(void)
 310 {
 311         if (conf.color_arg == color_arg_no)
 312                 return 0;
 313         if (conf.color_arg == color_arg_yes)
 314                 return 1;
 315         if (conf.logfile_given)
 316                 return 0;
 317         return isatty(STDERR_FILENO);
 318 }
 319
 320 static void parse_config_or_die(void)
 321 {
 322         int ret;
 323         char *config_file;
 324         struct audiod_cmdline_parser_params params = {
 325                 .override = 0,
 326                 .initialize = 0,
 327                 .check_required = 1,
 328                 .check_ambiguity = 0,
 329                 .print_errors = 1
 330         };
 331
 332         if (conf.config_file_given)
 333                 config_file = para_strdup(conf.config_file_arg);
 334         else {
 335                 char *home = para_homedir();
 336                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 337                 free(home);
 338         }
 339         ret = file_exists(config_file);
 340         if (conf.config_file_given && !ret) {
 341                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 342                 goto err;
 343         }
 344         if (ret)
 345                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 346         free(config_file);
 347         daemon_set_loglevel(conf.loglevel_arg);
 348         return;
 349 err:
 350         free(config_file);
 351         exit(EXIT_FAILURE);
 352 }
 353
 354 static void setup_signal_handling(void)
 355 {
 356         sig_task->fd = para_signal_init();
 357         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 358         para_install_sighandler(SIGINT);
 359         para_install_sighandler(SIGTERM);
 360         para_install_sighandler(SIGHUP);
 361         para_sigaction(SIGPIPE, SIG_IGN);
 362 }
 363
 364 static void clear_slot(int slot_num)
 365 {
 366         struct slot_info *s = &slot[slot_num];
 367
 368         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 369         memset(s, 0, sizeof(struct slot_info));
 370         s->format = -1;
 371 }
 372
 373 static void close_receiver(int slot_num)
 374 {
 375         struct slot_info *s = &slot[slot_num];
 376         struct audio_format_info *a;
 377
 378         if (s->format < 0 || !s->receiver_node)
 379                 return;
 380         a = &afi[s->format];
 381         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 382                 audio_formats[s->format], slot_num);
 383         a->receiver->close(s->receiver_node);
 384         btr_free_node(s->receiver_node->btrn);
 385         free(s->receiver_node);
 386         s->receiver_node = NULL;
 387         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 388                 &a->restart_barrier);
 389 }
 390
 391 static void writer_cleanup(struct writer_node *wn)
 392 {
 393         struct writer *w;
 394
 395         if (!wn)
 396                 return;
 397         w = writers + wn->writer_num;
 398         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 399         w->close(wn);
 400         btr_free_node(wn->btrn);
 401 }
 402
 403 static void close_writers(struct slot_info *s)
 404 {
 405         struct audio_format_info *a;
 406         int i;
 407
 408         if (s->format < 0)
 409                 return;
 410         assert(s->wns);
 411         a = afi + s->format;
 412         if (a->num_writers == 0)
 413                 writer_cleanup(s->wns);
 414         else {
 415                 for (i = 0; i < a->num_writers; i++)
 416                         writer_cleanup(s->wns + i);
 417         }
 418         free(s->wns);
 419         s->wns = NULL;
 420 }
 421
 422 static void close_filters(struct slot_info *s)
 423 {
 424         int i;
 425         struct audio_format_info *a = afi + s->format;
 426         if (a->num_filters == 0)
 427                 return;
 428         for (i = 0; i < a->num_filters; i++) {
 429                 struct filter_node *fn = s->fns + i;
 430                 struct filter *f;
 431
 432                 if (!fn)
 433                         continue;
 434                 f = filters + fn->filter_num;
 435                 if (f->close)
 436                         f->close(fn);
 437                 btr_free_node(fn->btrn);
 438         }
 439         free(s->fns);
 440         s->fns = NULL;
 441 }
 442
 443 /*
 444  * Whenever a task commits suicide by returning from post_select with t->error
 445  * < 0, it also removes its btr node. We do exactly that to kill a running
 446  * task. Note that the scheduler checks t->error also _before_ each pre/post
 447  * select call, so the victim will never be scheduled again.
 448  */
 449 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
 450 {
 451         if (t->error < 0)
 452                 return;
 453         t->error = error;
 454         btr_remove_node(btrn);
 455 }
 456
 457 static void kill_all_decoders(int error)
 458 {
 459         int i;
 460
 461         FOR_EACH_SLOT(i) {
 462                 struct slot_info *s = slot + i;
 463                 if (s->format < 0)
 464                         continue;
 465                 if (!s->receiver_node)
 466                         continue;
 467                 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
 468                                 error);
 469         }
 470 }
 471
 472 static int get_empty_slot(void)
 473 {
 474         int i;
 475         struct slot_info *s;
 476
 477         FOR_EACH_SLOT(i) {
 478                 s = &slot[i];
 479                 if (s->format < 0) {
 480                         clear_slot(i);
 481                         return i;
 482                 }
 483                 if (s->wns || s->receiver_node || s->fns)
 484                         continue;
 485                 clear_slot(i);
 486                 return i;
 487         }
 488         return -E_NO_MORE_SLOTS;
 489 }
 490
 491 static void open_filters(struct slot_info *s)
 492 {
 493         struct audio_format_info *a = afi + s->format;
 494         struct filter_node *fn;
 495         int nf = a->num_filters;
 496         struct btr_node *parent;
 497         int i;
 498
 499         if (nf == 0)
 500                 return;
 501         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 502         assert(s->fns == NULL);
 503         s->fns = para_calloc(nf * sizeof(struct filter_node));
 504         parent = s->receiver_node->btrn;
 505         for (i = 0; i < nf; i++) {
 506                 struct filter *f = filters + a->filter_nums[i];
 507                 fn = s->fns + i;
 508                 fn->filter_num = a->filter_nums[i];
 509                 fn->conf = a->filter_conf[i];
 510                 fn->task.pre_select = f->pre_select;
 511                 fn->task.post_select = f->post_select;
 512
 513                 fn->btrn = btr_new_node(&(struct btr_node_description)
 514                         EMBRACE(.name = f->name, .parent = parent,
 515                                 .handler = f->execute, .context = fn));
 516
 517                 f->open(fn);
 518                 register_task(&sched, &fn->task);
 519                 parent = fn->btrn;
 520                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 521                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 522                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 523         }
 524 }
 525
 526 static void open_writers(struct slot_info *s)
 527 {
 528         int i;
 529         struct audio_format_info *a = afi + s->format;
 530         struct writer_node *wn;
 531         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 532
 533         assert(s->wns == NULL);
 534         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 535                 * sizeof(struct writer_node));
 536         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 537         for (i = 0; i < a->num_writers; i++) {
 538                 wn = s->wns + i;
 539                 wn->conf = a->writer_conf[i];
 540                 wn->writer_num = a->writer_nums[i];
 541                 register_writer_node(wn, parent, &sched);
 542         }
 543 }
 544
 545 /* returns slot num on success */
 546 static int open_receiver(int format)
 547 {
 548         struct audio_format_info *a = &afi[format];
 549         struct slot_info *s;
 550         int ret, slot_num;
 551         struct receiver *r = a->receiver;
 552         struct receiver_node *rn;
 553
 554         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 555         ret = get_empty_slot();
 556         if (ret < 0)
 557                 return ret;
 558         slot_num = ret;
 559         rn = para_calloc(sizeof(*rn));
 560         rn->receiver = r;
 561         rn->conf = a->receiver_conf;
 562         rn->btrn = btr_new_node(&(struct btr_node_description)
 563                 EMBRACE(.name = r->name, .context = rn));
 564         ret = r->open(rn);
 565         if (ret < 0) {
 566                 btr_free_node(rn->btrn);
 567                 free(rn);
 568                 return ret;
 569         }
 570         s = &slot[slot_num];
 571         s->format = format;
 572         s->receiver_node = rn;
 573         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 574                 audio_formats[format], r->name, slot_num);
 575         rn->task.pre_select = r->pre_select;
 576         rn->task.post_select = r->post_select;
 577         sprintf(rn->task.status, "%s receiver node", r->name);
 578         register_task(&sched, &rn->task);
 579         return slot_num;
 580 }
 581
 582 static bool receiver_running(void)
 583 {
 584         int i;
 585         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 586
 587         FOR_EACH_SLOT(i) {
 588                 struct slot_info *s = &slot[i];
 589                 long unsigned ss2 = s->server_stream_start.tv_sec;
 590
 591                 if (!s->receiver_node)
 592                         continue;
 593                 if (s->receiver_node->task.error >= 0)
 594                         return true;
 595                 if (ss1 == ss2)
 596                         return true;
 597         }
 598         return false;
 599 }
 600
 601 /**
 602  * Return the root node of the current buffer tree.
 603  *
 604  * This is only used for stream grabbing.
 605  *
 606  * \return \p NULL if no slot is currently active. If more than one buffer tree
 607  * exists, the node corresponding to the most recently started receiver is
 608  * returned.
 609  */
 610 struct btr_node *audiod_get_btr_root(void)
 611 {
 612         int i, newest_slot = -1;
 613         struct timeval newest_rstime = {0, 0};
 614
 615         FOR_EACH_SLOT(i) {
 616                 struct slot_info *s = &slot[i];
 617                 struct timeval rstime;
 618                 if (!s->receiver_node)
 619                         continue;
 620                 if (s->receiver_node->task.error < 0)
 621                         continue;
 622                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 623                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 624                         continue;
 625                 newest_rstime = rstime;
 626                 newest_slot = i;
 627         }
 628         if (newest_slot == -1)
 629                 return NULL;
 630         return slot[newest_slot].receiver_node->btrn;
 631 }
 632
 633 /* whether a new instance of a decoder should be started. */
 634 static bool must_start_decoder(void)
 635 {
 636         int cafn = stat_task->current_audio_format_num;
 637         unsigned vs = stat_task->vss_status;
 638
 639         if (audiod_status != AUDIOD_ON)
 640                 return false;
 641         if (cafn < 0)
 642                 return false;
 643         if (!stat_task->ct)
 644                 return false;
 645         if (vs & VSS_STATUS_FLAG_NEXT)
 646                 return false;
 647         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 648                 return false;
 649         if (receiver_running())
 650                 return false;
 651         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 652                 return false;
 653         return true;
 654 }
 655
 656 static unsigned compute_time_diff(const struct timeval *status_time)
 657 {
 658         struct timeval tmp, diff;
 659         static unsigned count;
 660         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 661         const struct timeval max_deviation = {0, 500 * 1000};
 662         const int time_smooth = 5;
 663
 664         if (!status_time)
 665                 return count;
 666         sign = tv_diff(status_time, now, &diff);
 667 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 668 //                      sign, sa_time_diff_sign);
 669         if (!count) {
 670                 sa_time_diff_sign = sign;
 671                 stat_task->sa_time_diff = diff;
 672                 count++;
 673                 goto out;
 674         }
 675         if (count > 5) {
 676                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 677                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 678                         PARA_WARNING_LOG("time diff jump: %lims\n",
 679                                 s * tv2ms(&tmp));
 680         }
 681         count++;
 682         sa_time_diff_sign = tv_convex_combination(
 683                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 684                 count > 10? sign : sign * time_smooth, &diff,
 685                 &tmp);
 686         stat_task->sa_time_diff = tmp;
 687         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 688                 sign < 0? "-" : "+",
 689                 tv2ms(&diff),
 690                 sa_time_diff_sign < 0? "-" : "+",
 691                 tv2ms(&stat_task->sa_time_diff)
 692         );
 693 out:
 694         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 695         return count;
 696 }
 697
 698 static int update_item(int itemnum, char *buf)
 699 {
 700         long unsigned sec, usec;
 701
 702         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 703                 return 1;
 704         free(stat_item_values[itemnum]);
 705         stat_item_values[itemnum] = para_strdup(buf);
 706         stat_client_write_item(itemnum);
 707         switch (itemnum) {
 708         case SI_STATUS_FLAGS:
 709                 stat_task->vss_status = 0;
 710                 if (strchr(buf, 'N'))
 711                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 712                 if (strchr(buf, 'P'))
 713                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 714                 break;
 715         case SI_OFFSET:
 716                 stat_task->offset_seconds = atoi(buf);
 717                 break;
 718         case SI_SECONDS_TOTAL:
 719                 stat_task->length_seconds = atoi(buf);
 720                 break;
 721         case SI_STREAM_START:
 722                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 723                         stat_task->server_stream_start.tv_sec = sec;
 724                         stat_task->server_stream_start.tv_usec = usec;
 725                 }
 726                 break;
 727         case SI_CURRENT_TIME:
 728                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 729                         struct timeval tv = {sec, usec};
 730                         compute_time_diff(&tv);
 731                 }
 732                 break;
 733         case SI_FORMAT:
 734                 stat_task->current_audio_format_num
 735                         = get_audio_format_num(buf);
 736         }
 737         return 1;
 738 }
 739
 740 static int parse_stream_command(const char *txt, char **cmd)
 741 {
 742         int ret, len;
 743         char *re, *p = strchr(txt, ':');
 744
 745         if (!p)
 746                 return -E_MISSING_COLON;
 747         *cmd = p + 1;
 748         len = p - txt;
 749         re = malloc(len + 1);
 750         strncpy(re, txt, len);
 751         re[len] = '\0';
 752         ret = get_matching_audio_format_nums(re);
 753         free(re);
 754         return ret;
 755 }
 756
 757 static int add_filter(int format, char *cmdline)
 758 {
 759         struct audio_format_info *a = &afi[format];
 760         int filter_num, nf = a->num_filters;
 761         void *cfg;
 762
 763         filter_num = check_filter_arg(cmdline, &cfg);
 764         if (filter_num < 0)
 765                 return filter_num;
 766         a->filter_conf = para_realloc(a->filter_conf,
 767                 (nf + 1) * sizeof(void *));
 768         a->filter_nums = para_realloc(a->filter_nums,
 769                 (nf + 1) * sizeof(unsigned));
 770         a->filter_nums[nf] = filter_num;
 771         a->filter_conf[nf] = cfg;
 772         a->num_filters++;
 773         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 774                 filters[filter_num].name);
 775         return filter_num;
 776 }
 777
 778 static int parse_writer_args(void)
 779 {
 780         int i, ret;
 781         char *cmd;
 782         struct audio_format_info *a;
 783
 784         for (i = 0; i < conf.writer_given; i++) {
 785                 void *wconf;
 786                 int j, nw, writer_num, af_mask;
 787
 788                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 789                 if (ret < 0)
 790                         return ret;
 791                 af_mask = ret;
 792                 FOR_EACH_AUDIO_FORMAT(j) {
 793                         a = afi + j;
 794                         if ((af_mask & (1 << j)) == 0) /* no match */
 795                                 continue;
 796                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 797                         nw = a->num_writers;
 798                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 799                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 800                         a->writer_nums[nw] = writer_num;
 801                         a->writer_conf[nw] = wconf;
 802                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 803                                 nw, writer_names[writer_num]);
 804                         a->num_writers++;
 805                 }
 806         }
 807         /* Use default writer for audio formats which are not yet set up. */
 808         FOR_EACH_AUDIO_FORMAT(i) {
 809                 struct writer *w = writers + DEFAULT_WRITER;
 810                 a = afi + i;
 811                 if (a->num_writers > 0)
 812                         continue; /* already set up */
 813                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 814                         writer_names[DEFAULT_WRITER]);
 815                 a->writer_nums = para_malloc(sizeof(int));
 816                 a->writer_nums[0] = DEFAULT_WRITER;
 817                 a->writer_conf = para_malloc(sizeof(void *));
 818                 a->writer_conf[0] = w->parse_config_or_die("");
 819                 a->num_writers = 1;
 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 void 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 }
1019
1020 static void signal_setup_default(struct signal_task *st)
1021 {
1022         st->task.pre_select = signal_pre_select;
1023         st->task.post_select = signal_post_select;
1024         sprintf(st->task.status, "signal task");
1025 }
1026
1027 static void command_pre_select(struct sched *s, struct task *t)
1028 {
1029         struct command_task *ct = container_of(t, struct command_task, task);
1030         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1031 }
1032
1033 static void command_post_select(struct sched *s, struct task *t)
1034 {
1035         int ret;
1036         struct command_task *ct = container_of(t, struct command_task, task);
1037         static struct timeval last_status_dump;
1038         struct timeval tmp, delay = {0, 500 * 1000};
1039
1040         tv_add(&last_status_dump, &delay, &tmp);
1041         if (tv_diff(&tmp, now, NULL) < 0) {
1042                 audiod_status_dump();
1043                 last_status_dump = *now;
1044         }
1045
1046         ret = handle_connect(ct->fd, &s->rfds);
1047         if (ret < 0)
1048                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1049         audiod_status_dump();
1050 }
1051
1052 static void init_command_task(struct command_task *ct)
1053 {
1054         ct->task.pre_select = command_pre_select;
1055         ct->task.post_select = command_post_select;
1056         ct->task.error = 0;
1057         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1058         sprintf(ct->task.status, "command task");
1059 }
1060
1061 static void close_stat_pipe(void)
1062 {
1063         if (!stat_task->ct)
1064                 return;
1065         client_close(stat_task->ct);
1066         stat_task->ct = NULL;
1067         clear_and_dump_items();
1068         stat_task->length_seconds = 0;
1069         stat_task->offset_seconds = 0;
1070         stat_task->vss_status = 0;
1071         stat_task->current_audio_format_num = -1;
1072         audiod_status_dump();
1073 }
1074
1075 /**
1076  * close the connection to para_server and exit
1077  *
1078  * \param status the exit status which is passed to exit(3)
1079  * \param msg the log message
1080  *
1081  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1082  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1083  * EXIT_FAILURE.
1084  *
1085  * \sa exit(3)
1086  */
1087 void __noreturn clean_exit(int status, const char *msg)
1088 {
1089         PARA_EMERG_LOG("%s\n", msg);
1090         if (socket_name)
1091                 unlink(socket_name);
1092         close_stat_pipe();
1093         exit(status);
1094 }
1095
1096 /* avoid busy loop if server is down */
1097 static void set_stat_task_restart_barrier(unsigned seconds)
1098 {
1099         struct timeval delay = {seconds, 0};
1100         tv_add(now, &delay, &stat_task->restart_barrier);
1101 }
1102
1103 static void try_to_close_slot(int slot_num)
1104 {
1105         struct slot_info *s = &slot[slot_num];
1106         struct audio_format_info *a = afi + s->format;
1107         int i;
1108
1109         if (s->format < 0)
1110                 return;
1111         if (s->receiver_node && s->receiver_node->task.error >= 0)
1112                 return;
1113         for (i = 0; i < a->num_filters; i++)
1114                 if (s->fns && s->fns[i].task.error >= 0)
1115                         return;
1116         if (a->num_writers > 0) {
1117                 for (i = 0; i < a->num_writers; i++)
1118                         if (s->wns && s->wns[i].task.error >= 0)
1119                                 return;
1120         } else {
1121                 if (s->wns && s->wns[0].task.error >= 0)
1122                         return;
1123         }
1124         PARA_INFO_LOG("closing slot %d\n", slot_num);
1125         close_writers(s);
1126         close_filters(s);
1127         close_receiver(slot_num);
1128         clear_slot(slot_num);
1129 }
1130
1131 /*
1132  * Check if any receivers/filters/writers need to be started and do so if
1133  * necessary.
1134  */
1135 static void start_stop_decoders(void)
1136 {
1137         int i, ret;
1138         struct slot_info *sl;
1139         struct audio_format_info *a;
1140
1141         FOR_EACH_SLOT(i)
1142                 try_to_close_slot(i);
1143         if (audiod_status != AUDIOD_ON ||
1144                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1145                 return kill_all_decoders(-E_NOT_PLAYING);
1146         if (!must_start_decoder())
1147                 return;
1148         ret = open_receiver(stat_task->current_audio_format_num);
1149         if (ret < 0) {
1150                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1151                 return;
1152         }
1153         sl = slot + ret;
1154         a = afi + sl->format;
1155         if (a->num_filters)
1156                 open_filters(sl);
1157         open_writers(sl);
1158         activate_grab_clients(&sched);
1159         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1160 }
1161
1162 static void status_pre_select(struct sched *s, struct task *t)
1163 {
1164         struct status_task *st = container_of(t, struct status_task, task);
1165         int ret, cafn = stat_task->current_audio_format_num;
1166
1167         if (must_start_decoder())
1168                 goto min_delay;
1169         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1170         if (ret > 0)
1171                 goto min_delay;
1172         if (st->ct && audiod_status == AUDIOD_OFF)
1173                 goto min_delay;
1174         if (!st->ct && audiod_status != AUDIOD_OFF)
1175                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1176         if (cafn >= 0)
1177                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1178         /*
1179          * If para_server is playing we'd like to have a smooth time display
1180          * even if we are running in standby mode. So we request a timeout that
1181          * expires at the next full second.
1182          */
1183         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1184                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1185         return;
1186 min_delay:
1187         sched_min_delay(s);
1188 }
1189
1190 /* restart the client task if necessary */
1191 static void status_post_select(struct sched *s, struct task *t)
1192 {
1193         struct status_task *st = container_of(t, struct status_task, task);
1194
1195         if (audiod_status == AUDIOD_OFF) {
1196                 if (!st->ct)
1197                         goto out;
1198                 if (st->ct->task.error >= 0) {
1199                         kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1200                         goto out;
1201                 }
1202                 if (st->ct->task.error >= 0)
1203                         goto out;
1204                 close_stat_pipe();
1205                 st->clock_diff_count = conf.clock_diff_count_arg;
1206                 goto out;
1207         }
1208         if (st->ct) {
1209                 char *buf;
1210                 size_t sz;
1211                 int ret;
1212                 if (st->ct->task.error < 0) {
1213                         if (st->ct->task.error >= 0)
1214                                 goto out;
1215                         close_stat_pipe();
1216                         goto out;
1217                 }
1218                 if (st->ct->status != CL_RECEIVING)
1219                         goto out;
1220                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1221                 if (ret <= 0) {
1222                         struct timeval diff;
1223                         tv_diff(now, &st->last_status_read, &diff);
1224                         if (diff.tv_sec > 61)
1225                                 kill_btrn(st->ct->btrn, &st->ct->task,
1226                                         -E_STATUS_TIMEOUT);
1227                         goto out;
1228                 }
1229                 btr_merge(st->btrn, st->min_iqs);
1230                 sz = btr_next_buffer(st->btrn, &buf);
1231                 ret = for_each_stat_item(buf, sz, update_item);
1232                 if (ret < 0) {
1233                         kill_btrn(st->ct->btrn, &st->ct->task, ret);
1234                         goto out;
1235                 }
1236                 if (sz != ret) {
1237                         btr_consume(st->btrn, sz - ret);
1238                         st->last_status_read = *now;
1239                         st->min_iqs = 0;
1240                 } else /* current status item crosses buffers */
1241                         st->min_iqs = sz + 1;
1242                 goto out;
1243         }
1244         btr_drain(st->btrn);
1245         st->current_audio_format_num = -1;
1246         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1247                 goto out;
1248         if (st->clock_diff_count) { /* get status only one time */
1249                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1250                 int argc = 5;
1251                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1252                 st->clock_diff_count--;
1253                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1254                 set_stat_task_restart_barrier(2);
1255
1256         } else {
1257                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1258                 int argc = 4;
1259                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1260                 set_stat_task_restart_barrier(5);
1261         }
1262         free(stat_item_values[SI_BASENAME]);
1263         stat_item_values[SI_BASENAME] = para_strdup(
1264                 "no connection to para_server");
1265         stat_client_write_item(SI_BASENAME);
1266         st->last_status_read = *now;
1267 out:
1268         start_stop_decoders();
1269 }
1270
1271 static void init_status_task(struct status_task *st)
1272 {
1273         memset(st, 0, sizeof(struct status_task));
1274         st->task.pre_select = status_pre_select;
1275         st->task.post_select = status_post_select;
1276         st->sa_time_diff_sign = 1;
1277         st->clock_diff_count = conf.clock_diff_count_arg;
1278         st->current_audio_format_num = -1;
1279         sprintf(st->task.status, "stat");
1280         st->btrn = btr_new_node(&(struct btr_node_description)
1281                 EMBRACE(.name = "stat"));
1282 }
1283
1284 static void set_initial_status(void)
1285 {
1286         audiod_status = AUDIOD_ON;
1287         if (!conf.mode_given)
1288                 return;
1289         if (!strcmp(conf.mode_arg, "sb")) {
1290                 audiod_status = AUDIOD_STANDBY;
1291                 return;
1292         }
1293         if (!strcmp(conf.mode_arg, "off")) {
1294                 audiod_status = AUDIOD_OFF;
1295                 return;
1296         }
1297         if (strcmp(conf.mode_arg, "on"))
1298                 PARA_WARNING_LOG("invalid mode\n");
1299 }
1300
1301 __noreturn static void print_help_and_die(void)
1302 {
1303         int d = conf.detailed_help_given;
1304         const char **p = d? audiod_args_info_detailed_help
1305                 : audiod_args_info_help;
1306
1307         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1308                 AUDIOD_CMDLINE_PARSER_VERSION);
1309         printf_or_die("%s\n\n", audiod_args_info_usage);
1310         for (; *p; p++)
1311                 printf_or_die("%s\n", *p);
1312         print_receiver_helps(d);
1313         print_filter_helps(d);
1314         print_writer_helps(d);
1315         exit(0);
1316 }
1317
1318 static void init_colors_or_die(void)
1319 {
1320         int i;
1321
1322         if (!want_colors())
1323                 return;
1324         daemon_set_default_log_colors();
1325         daemon_set_flag(DF_COLOR_LOG);
1326         for (i = 0; i < conf.log_color_given; i++)
1327                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1328 }
1329
1330 /**
1331  * the main function of para_audiod
1332  *
1333  * \param argc usual argument count
1334  * \param argv usual argument vector
1335  *
1336  * \return EXIT_SUCCESS or EXIT_FAILURE
1337  *
1338  * \sa para_audiod(1)
1339  * */
1340 int main(int argc, char *argv[])
1341 {
1342         int ret, i;
1343         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1344         struct audiod_cmdline_parser_params params = {
1345                 .override = 0,
1346                 .initialize = 1,
1347                 .check_required = 0,
1348                 .check_ambiguity = 0,
1349                 .print_errors = 1
1350         };
1351
1352         valid_fd_012();
1353         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1354                 exit(EXIT_FAILURE);
1355         HANDLE_VERSION_FLAG("audiod", conf);
1356         /* init receivers/filters/writers early to make help work */
1357         recv_init();
1358         filter_init();
1359         writer_init();
1360         if (conf.help_given || conf.detailed_help_given)
1361                 print_help_and_die();
1362         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1363         parse_config_or_die();
1364         init_colors_or_die();
1365         init_random_seed_or_die();
1366         daemon_set_flag(DF_LOG_TIME);
1367         daemon_set_flag(DF_LOG_HOSTNAME);
1368         daemon_set_flag(DF_LOG_LL);
1369         if (conf.log_timing_given)
1370                 daemon_set_flag(DF_LOG_TIMING);
1371         if (conf.logfile_given) {
1372                 daemon_set_logfile(conf.logfile_arg);
1373                 daemon_open_log_or_die();
1374         }
1375         ret = parse_stream_args();
1376         if (ret < 0) {
1377                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1378                 exit(EXIT_FAILURE);
1379         }
1380         log_welcome("para_audiod");
1381         set_server_start_time(NULL);
1382         set_initial_status();
1383         FOR_EACH_SLOT(i)
1384                 clear_slot(i);
1385         setup_signal_handling();
1386         signal_setup_default(sig_task);
1387
1388         init_status_task(stat_task);
1389         init_command_task(cmd_task);
1390
1391         if (conf.daemon_given)
1392                 daemonize(false /* parent exits immediately */);
1393
1394         register_task(&sched, &sig_task->task);
1395         register_task(&sched, &cmd_task->task);
1396         register_task(&sched, &stat_task->task);
1397         sched.default_timeout.tv_sec = 2;
1398         sched.default_timeout.tv_usec = 999 * 1000;
1399         ret = schedule(&sched);
1400
1401         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1402         return EXIT_FAILURE;
1403 }