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
   9 #include <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "crypt.h"
  21 #include "audiod.cmdline.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "ggo.h"
  25 #include "buffer_tree.h"
  26 #include "recv.h"
  27 #include "filter.h"
  28 #include "grab_client.h"
  29 #include "client.cmdline.h"
  30 #include "client.h"
  31 #include "audiod.h"
  32 #include "net.h"
  33 #include "daemon.h"
  34 #include "string.h"
  35 #include "fd.h"
  36 #include "write.h"
  37 #include "write_common.h"
  38 #include "signal.h"
  39 #include "version.h"
  40
  41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  46
  47 DEFINE_RECEIVER_ARRAY;
  48
  49 /** Defines how audiod handles one supported audio format. */
  50 struct audio_format_info {
  51         /** pointer to the receiver for this audio format */
  52         struct receiver *receiver;
  53         /** the receiver configuration */
  54         void *receiver_conf;
  55         /** the number of filters that should be activated for this audio format */
  56         unsigned int num_filters;
  57         /** Array of filter numbers to be activated. */
  58         unsigned *filter_nums;
  59         /** Pointer to the array of filter configurations. */
  60         void **filter_conf;
  61         /** the number of filters that should be activated for this audio format */
  62         unsigned int num_writers;
  63         /** Array of writer numbers to be activated. */
  64         int *writer_nums;
  65         /** pointer to the array of writer configurations */
  66         void **writer_conf;
  67         /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  73  * be associated with a receiver/filter/writer triple. This array holds all
  74  * information on the status of these slots.
  75  *
  76  * \sa struct slot_info
  77  * */
  78 struct slot_info slot[MAX_STREAM_SLOTS];
  79
  80 /** The vss status flags audiod is interested in. */
  81 enum vss_status_flags {
  82         /** Whether the 'N' flag is set. */
  83         VSS_STATUS_FLAG_NEXT = 1,
  84         /** The 'P' flag is set. */
  85         VSS_STATUS_FLAG_PLAYING = 2,
  86 };
  87
  88 /**
  89  * The scheduler instance of para_audiod.
  90  *
  91  * This is needed also in audiod_command.c (for the tasks command), so it can
  92  * not be made static.
  93  */
  94 struct sched sched = {.max_fileno = 0};
  95
  96 /**
  97  * The task for obtaining para_server's status (para_client stat).
  98  *
  99  * \sa struct task, struct sched.
 100  */
 101 struct status_task {
 102         /** The associated task structure of audiod. */
 103         struct task task;
 104         /** Client data associated with the stat task. */
 105         struct client_task *ct;
 106         /** Do not restart client command until this time. */
 107         struct timeval restart_barrier;
 108         /** Last time we received status data from para_server. */
 109         struct timeval last_status_read;
 110         size_t min_iqs;
 111         /** The offset value announced by para_server. */
 112         int offset_seconds;
 113         /** The length of the current audio file as announced by para_server. */
 114         int length_seconds;
 115         /** The start of the current stream from the view of para_server. */
 116         struct timeval server_stream_start;
 117         /** The average time deviation between para_server and para_audiod. */
 118         struct timeval sa_time_diff;
 119         /** Whether client time is ahead of server time. */
 120         int sa_time_diff_sign;
 121         /** The 'P' and the 'N' flags as announced by para_server. */
 122         enum vss_status_flags vss_status;
 123         /** Number of times the clock difference is to be checked. */
 124         unsigned clock_diff_count;
 125         /** When to start the next check for clock difference. */
 126         struct timeval clock_diff_barrier;
 127         /** Number of the audio format as announced by para_server. */
 128         int current_audio_format_num;
 129         /* The status task btrn is the child of the client task. */
 130         struct btr_node *btrn;
 131 };
 132
 133 /** The array of status items sent by para_server. */
 134 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 135
 136 /**
 137  * the current mode of operation of which can be changed by the on/off/cycle
 138  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 139  */
 140 int audiod_status = AUDIOD_ON;
 141
 142 /**
 143  * the gengetopt args_info struct that holds information on all command line
 144  * arguments
 145  */
 146 struct audiod_args_info conf;
 147
 148 static char *socket_name;
 149 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 150
 151 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 152
 153 static struct status_task status_task_struct;
 154
 155 /**
 156  * the task that calls the status command of para_server
 157  *
 158  * \sa struct status_task
 159  */
 160 static struct status_task *stat_task = &status_task_struct;
 161
 162 /**
 163  * the task for handling audiod commands
 164  *
 165  * \sa struct task, struct sched
 166  */
 167 struct command_task {
 168         /** the local listening socket */
 169         int fd;
 170         /** the associated task structure */
 171         struct task task;
 172 };
 173
 174 /** iterate over all supported audio formats */
 175 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 176
 177 /**
 178  * Get the audio format number.
 179  *
 180  * \param name The name of the audio format.
 181  *
 182  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 183  * \a name is not a supported audio format.
 184  */
 185 static int get_audio_format_num(const char *name)
 186 {
 187         int i;
 188
 189         while (para_isspace(*name))
 190                 name++;
 191         FOR_EACH_AUDIO_FORMAT(i)
 192                 if (!strcmp(name, audio_formats[i]))
 193                         return i;
 194         return -E_UNSUPPORTED_AUDIO_FORMAT;
 195 }
 196
 197 static int get_matching_audio_format_nums(const char *re)
 198 {
 199         int i, ret;
 200         regex_t preg;
 201
 202         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 203         if (ret < 0)
 204                 return ret;
 205         ret = 0;
 206         FOR_EACH_AUDIO_FORMAT(i)
 207                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 208                         ret |= (1 << i);
 209         regfree(&preg);
 210         return ret;
 211 }
 212
 213 /**
 214  * Compute the play time based on information of the given slot.
 215  *
 216  * \param slot_num The slot number (negative means: no slot).
 217  *
 218  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 219  * from the status items received from para_server and the start time of the
 220  * (first) writer of the given slot.
 221  *
 222  * It has to to take into account that probably the stream was not started at
 223  * the beginning of the file, that the clock between the server and the client
 224  * host may differ and that playback of the stream was delayed, e.g. because
 225  * the prebuffer filter is used in the filter configuration of the given slot.
 226  *
 227  * If no writer is active in the given slot, or \a slot_num is negative
 228  * (indicating that para_audiod runs in standby mode), an approximation based
 229  * only on the status items is computed and the returned string is prefixed
 230  * with "~".
 231  *
 232  * \return A string that must be freed by the caller.
 233  */
 234 char *get_time_string(int slot_num)
 235 {
 236         int ret, seconds = 0, length;
 237         struct timeval *tmp, sum, sss, /* server stream start */
 238                 rstime, /* receiver start time */
 239                 wstime, /* writer start time */
 240                 wtime, /* now - writer start */
 241                 rskip; /* receiver start - sss */
 242         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 243         char *msg;
 244
 245         if (audiod_status == AUDIOD_OFF)
 246                 goto empty;
 247         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 248                 if (stat_task->length_seconds) /* paused */
 249                         return NULL;
 250                 goto empty; /* stopped */
 251         }
 252         if (audiod_status == AUDIOD_ON && !s)
 253                 goto empty;
 254         /*
 255          * Valid status items and playing, set length and tmp to the stream
 256          * start. We use the slot info and fall back to the info from current
 257          * status items if no slot info is available.
 258          */
 259         length = stat_task->length_seconds;
 260         tmp = &stat_task->server_stream_start;
 261         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 262                 btr_get_node_start(s->wns[0].btrn, &wstime);
 263                 if (wstime.tv_sec != 0) { /* writer wrote something */
 264                         if (s->server_stream_start.tv_sec == 0) {
 265                                 /* copy status info to slot */
 266                                 s->server_stream_start = stat_task->server_stream_start;
 267                                 s->offset_seconds = stat_task->offset_seconds;
 268                                 s->seconds_total = stat_task->length_seconds;
 269                         }
 270                         length = s->seconds_total;
 271                         tmp = &s->server_stream_start;
 272                 }
 273         }
 274         if (stat_task->sa_time_diff_sign > 0)
 275                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 276         else
 277                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 278         if (!s || !s->wns || !s->wns[0].btrn) {
 279                 struct timeval diff;
 280                 tv_diff(now, &sss, &diff);
 281                 seconds = diff.tv_sec + stat_task->offset_seconds;
 282                 goto out;
 283         }
 284         tv_diff(now, &wstime, &wtime);
 285         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 286         seconds = s->offset_seconds;
 287         if (s->receiver_node->btrn) {
 288                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 289                 ret = tv_diff(&rstime, &sss, &rskip);
 290                 if (ret > 0) { /* audiod was started in the middle of the stream */
 291                         tv_add(&wtime, &rskip, &sum);
 292                         seconds += sum.tv_sec;
 293                 } else
 294                         seconds += wtime.tv_sec;
 295         } else
 296                 seconds += wtime.tv_sec;
 297 out:
 298         seconds = PARA_MIN(seconds, length);
 299         seconds = PARA_MAX(seconds, 0);
 300         msg = make_message(
 301                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 302                 s? "" : "~",
 303                 seconds / 60,
 304                 seconds % 60,
 305                 (length - seconds) / 60,
 306                 (length - seconds) % 60,
 307                 length? (seconds * 100 + length / 2) / length : 0,
 308                 length / 60,
 309                 length % 60
 310         );
 311         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 312         return msg;
 313 empty:
 314         return para_strdup(NULL);
 315 }
 316
 317 static int want_colors(void)
 318 {
 319         if (conf.color_arg == color_arg_no)
 320                 return 0;
 321         if (conf.color_arg == color_arg_yes)
 322                 return 1;
 323         if (conf.logfile_given)
 324                 return 0;
 325         return isatty(STDERR_FILENO);
 326 }
 327
 328 static void parse_config_or_die(void)
 329 {
 330         int ret;
 331         char *config_file;
 332         struct audiod_cmdline_parser_params params = {
 333                 .override = 0,
 334                 .initialize = 0,
 335                 .check_required = 1,
 336                 .check_ambiguity = 0,
 337                 .print_errors = 1
 338         };
 339
 340         if (conf.config_file_given)
 341                 config_file = para_strdup(conf.config_file_arg);
 342         else {
 343                 char *home = para_homedir();
 344                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 345                 free(home);
 346         }
 347         ret = file_exists(config_file);
 348         if (conf.config_file_given && !ret) {
 349                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 350                 goto err;
 351         }
 352         if (ret) {
 353                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 354                 daemon_set_loglevel(conf.loglevel_arg);
 355         }
 356         free(config_file);
 357         return;
 358 err:
 359         free(config_file);
 360         exit(EXIT_FAILURE);
 361 }
 362
 363 static void setup_signal_handling(void)
 364 {
 365         sig_task->fd = para_signal_init();
 366         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 367         para_install_sighandler(SIGINT);
 368         para_install_sighandler(SIGTERM);
 369         para_install_sighandler(SIGHUP);
 370         para_sigaction(SIGPIPE, SIG_IGN);
 371 }
 372
 373 static void clear_slot(int slot_num)
 374 {
 375         struct slot_info *s = &slot[slot_num];
 376
 377         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 378         memset(s, 0, sizeof(struct slot_info));
 379         s->format = -1;
 380 }
 381
 382 static void close_receiver(int slot_num)
 383 {
 384         struct slot_info *s = &slot[slot_num];
 385         struct audio_format_info *a;
 386
 387         if (s->format < 0 || !s->receiver_node)
 388                 return;
 389         a = &afi[s->format];
 390         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 391                 audio_formats[s->format], slot_num);
 392         a->receiver->close(s->receiver_node);
 393         btr_remove_node(&s->receiver_node->btrn);
 394         free(s->receiver_node);
 395         s->receiver_node = NULL;
 396         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 397                 &a->restart_barrier);
 398 }
 399
 400 static void writer_cleanup(struct writer_node *wn)
 401 {
 402         struct writer *w;
 403
 404         if (!wn)
 405                 return;
 406         w = writers + wn->writer_num;
 407         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 408         w->close(wn);
 409         btr_remove_node(&wn->btrn);
 410 }
 411
 412 static void close_writers(struct slot_info *s)
 413 {
 414         struct audio_format_info *a;
 415         int i;
 416
 417         if (s->format < 0)
 418                 return;
 419         assert(s->wns);
 420         a = afi + s->format;
 421         if (a->num_writers == 0)
 422                 writer_cleanup(s->wns);
 423         else {
 424                 for (i = 0; i < a->num_writers; i++)
 425                         writer_cleanup(s->wns + i);
 426         }
 427         free(s->wns);
 428         s->wns = NULL;
 429 }
 430
 431 static void close_filters(struct slot_info *s)
 432 {
 433         int i;
 434         struct audio_format_info *a = afi + s->format;
 435         if (a->num_filters == 0)
 436                 return;
 437         for (i = a->num_filters - 1; i >= 0; i--) {
 438                 struct filter_node *fn = s->fns + i;
 439                 struct filter *f;
 440
 441                 if (!fn)
 442                         continue;
 443                 f = filters + fn->filter_num;
 444                 if (f->close)
 445                         f->close(fn);
 446                 btr_remove_node(&fn->btrn);
 447         }
 448         free(s->fns);
 449         s->fns = NULL;
 450 }
 451
 452 static void notify_receivers(int error)
 453 {
 454         int i;
 455
 456         FOR_EACH_SLOT(i) {
 457                 struct slot_info *s = slot + i;
 458                 if (s->format < 0)
 459                         continue;
 460                 if (!s->receiver_node)
 461                         continue;
 462                 task_notify(&s->receiver_node->task, error);
 463         }
 464 }
 465
 466 static int get_empty_slot(void)
 467 {
 468         int i;
 469         struct slot_info *s;
 470
 471         FOR_EACH_SLOT(i) {
 472                 s = &slot[i];
 473                 if (s->format < 0) {
 474                         clear_slot(i);
 475                         return i;
 476                 }
 477                 if (s->wns || s->receiver_node || s->fns)
 478                         continue;
 479                 clear_slot(i);
 480                 return i;
 481         }
 482         return -E_NO_MORE_SLOTS;
 483 }
 484
 485 static void open_filters(struct slot_info *s)
 486 {
 487         struct audio_format_info *a = afi + s->format;
 488         struct filter_node *fn;
 489         int nf = a->num_filters;
 490         struct btr_node *parent;
 491         int i;
 492
 493         if (nf == 0)
 494                 return;
 495         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 496         assert(s->fns == NULL);
 497         s->fns = para_calloc(nf * sizeof(struct filter_node));
 498         parent = s->receiver_node->btrn;
 499         for (i = 0; i < nf; i++) {
 500                 struct filter *f = filters + a->filter_nums[i];
 501                 fn = s->fns + i;
 502                 fn->filter_num = a->filter_nums[i];
 503                 fn->conf = a->filter_conf[i];
 504                 fn->task.pre_select = f->pre_select;
 505                 fn->task.post_select = f->post_select;
 506                 fn->btrn = btr_new_node(&(struct btr_node_description)
 507                         EMBRACE(.name = f->name, .parent = parent,
 508                                 .handler = f->execute, .context = fn));
 509
 510                 f->open(fn);
 511                 register_task(&sched, &fn->task);
 512                 parent = fn->btrn;
 513                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 514                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 515                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 516         }
 517 }
 518
 519 static void open_writers(struct slot_info *s)
 520 {
 521         int i;
 522         struct audio_format_info *a = afi + s->format;
 523         struct writer_node *wn;
 524         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 525
 526         assert(s->wns == NULL);
 527         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 528                 * sizeof(struct writer_node));
 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                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 535                         writer_names[a->writer_nums[i]], (int)(s - slot));
 536         }
 537 }
 538
 539 /* returns slot num on success */
 540 static int open_receiver(int format)
 541 {
 542         struct audio_format_info *a = &afi[format];
 543         struct slot_info *s;
 544         int ret, slot_num;
 545         struct receiver *r = a->receiver;
 546         struct receiver_node *rn;
 547
 548         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 549         ret = get_empty_slot();
 550         if (ret < 0)
 551                 return ret;
 552         slot_num = ret;
 553         rn = para_calloc(sizeof(*rn));
 554         rn->receiver = r;
 555         rn->conf = a->receiver_conf;
 556         rn->btrn = btr_new_node(&(struct btr_node_description)
 557                 EMBRACE(.name = r->name, .context = rn));
 558         ret = r->open(rn);
 559         if (ret < 0) {
 560                 btr_remove_node(&rn->btrn);
 561                 free(rn);
 562                 return ret;
 563         }
 564         s = &slot[slot_num];
 565         s->format = format;
 566         s->receiver_node = rn;
 567         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 568                 audio_formats[format], r->name, slot_num);
 569         rn->task.pre_select = r->pre_select;
 570         rn->task.post_select = r->post_select;
 571         sprintf(rn->task.status, "%s receiver node", r->name);
 572         register_task(&sched, &rn->task);
 573         return slot_num;
 574 }
 575
 576 static bool receiver_running(void)
 577 {
 578         int i;
 579         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 580
 581         FOR_EACH_SLOT(i) {
 582                 struct slot_info *s = &slot[i];
 583                 long unsigned ss2 = s->server_stream_start.tv_sec;
 584
 585                 if (!s->receiver_node)
 586                         continue;
 587                 if (s->receiver_node->task.error >= 0)
 588                         return true;
 589                 if (ss1 == ss2)
 590                         return true;
 591         }
 592         return false;
 593 }
 594
 595 /**
 596  * Return the root node of the current buffer tree.
 597  *
 598  * This is only used for stream grabbing.
 599  *
 600  * \return \p NULL if no slot is currently active. If more than one buffer tree
 601  * exists, the node corresponding to the most recently started receiver is
 602  * returned.
 603  */
 604 struct btr_node *audiod_get_btr_root(void)
 605 {
 606         int i, newest_slot = -1;
 607         struct timeval newest_rstime = {0, 0};
 608
 609         FOR_EACH_SLOT(i) {
 610                 struct slot_info *s = &slot[i];
 611                 struct timeval rstime;
 612                 if (!s->receiver_node)
 613                         continue;
 614                 if (s->receiver_node->task.error < 0)
 615                         continue;
 616                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 617                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 618                         continue;
 619                 newest_rstime = rstime;
 620                 newest_slot = i;
 621         }
 622         if (newest_slot == -1)
 623                 return NULL;
 624         return slot[newest_slot].receiver_node->btrn;
 625 }
 626
 627 /* whether a new instance of a decoder should be started. */
 628 static bool must_start_decoder(void)
 629 {
 630         int cafn = stat_task->current_audio_format_num;
 631         unsigned vs = stat_task->vss_status;
 632
 633         if (audiod_status != AUDIOD_ON)
 634                 return false;
 635         if (cafn < 0)
 636                 return false;
 637         if (!stat_task->ct)
 638                 return false;
 639         if (vs & VSS_STATUS_FLAG_NEXT)
 640                 return false;
 641         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 642                 return false;
 643         if (receiver_running())
 644                 return false;
 645         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 646                 return false;
 647         return true;
 648 }
 649
 650 static unsigned compute_time_diff(const struct timeval *status_time)
 651 {
 652         struct timeval tmp, diff;
 653         static unsigned count;
 654         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 655         const struct timeval max_deviation = {0, 500 * 1000};
 656         const int time_smooth = 5;
 657
 658         if (!status_time)
 659                 return count;
 660         sign = tv_diff(status_time, now, &diff);
 661 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 662 //                      sign, sa_time_diff_sign);
 663         if (!count) {
 664                 sa_time_diff_sign = sign;
 665                 stat_task->sa_time_diff = diff;
 666                 count++;
 667                 goto out;
 668         }
 669         if (count > 5) {
 670                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 671                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 672                         PARA_WARNING_LOG("time diff jump: %lims\n",
 673                                 s * tv2ms(&tmp));
 674         }
 675         count++;
 676         sa_time_diff_sign = tv_convex_combination(
 677                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 678                 count > 10? sign : sign * time_smooth, &diff,
 679                 &tmp);
 680         stat_task->sa_time_diff = tmp;
 681         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 682                 sign < 0? "-" : "+",
 683                 tv2ms(&diff),
 684                 sa_time_diff_sign < 0? "-" : "+",
 685                 tv2ms(&stat_task->sa_time_diff)
 686         );
 687 out:
 688         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 689         return count;
 690 }
 691
 692 static int update_item(int itemnum, char *buf)
 693 {
 694         long unsigned sec, usec;
 695
 696         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 697                 return 1;
 698         free(stat_item_values[itemnum]);
 699         stat_item_values[itemnum] = para_strdup(buf);
 700         stat_client_write_item(itemnum);
 701         switch (itemnum) {
 702         case SI_STATUS_FLAGS:
 703                 stat_task->vss_status = 0;
 704                 if (strchr(buf, 'N'))
 705                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 706                 if (strchr(buf, 'P'))
 707                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 708                 break;
 709         case SI_OFFSET:
 710                 stat_task->offset_seconds = atoi(buf);
 711                 break;
 712         case SI_SECONDS_TOTAL:
 713                 stat_task->length_seconds = atoi(buf);
 714                 break;
 715         case SI_STREAM_START:
 716                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 717                         stat_task->server_stream_start.tv_sec = sec;
 718                         stat_task->server_stream_start.tv_usec = usec;
 719                 }
 720                 break;
 721         case SI_CURRENT_TIME:
 722                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 723                         struct timeval tv = {sec, usec};
 724                         compute_time_diff(&tv);
 725                 }
 726                 break;
 727         case SI_FORMAT:
 728                 stat_task->current_audio_format_num
 729                         = get_audio_format_num(buf);
 730         }
 731         return 1;
 732 }
 733
 734 static int parse_stream_command(const char *txt, char **cmd)
 735 {
 736         int ret, len;
 737         char *re, *p = strchr(txt, ':');
 738
 739         if (!p)
 740                 return -E_MISSING_COLON;
 741         *cmd = p + 1;
 742         len = p - txt;
 743         re = malloc(len + 1);
 744         strncpy(re, txt, len);
 745         re[len] = '\0';
 746         ret = get_matching_audio_format_nums(re);
 747         free(re);
 748         return ret;
 749 }
 750
 751 static int add_filter(int format, char *cmdline)
 752 {
 753         struct audio_format_info *a = &afi[format];
 754         int filter_num, nf = a->num_filters;
 755         void *cfg;
 756
 757         filter_num = check_filter_arg(cmdline, &cfg);
 758         if (filter_num < 0)
 759                 return filter_num;
 760         a->filter_conf = para_realloc(a->filter_conf,
 761                 (nf + 1) * sizeof(void *));
 762         a->filter_nums = para_realloc(a->filter_nums,
 763                 (nf + 1) * sizeof(unsigned));
 764         a->filter_nums[nf] = filter_num;
 765         a->filter_conf[nf] = cfg;
 766         a->num_filters++;
 767         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 768                 filters[filter_num].name);
 769         return filter_num;
 770 }
 771
 772 static int parse_writer_args(void)
 773 {
 774         int i, ret;
 775         char *cmd;
 776         struct audio_format_info *a;
 777
 778         for (i = 0; i < conf.writer_given; i++) {
 779                 void *wconf;
 780                 int j, nw, writer_num, af_mask;
 781
 782                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 783                 if (ret < 0)
 784                         return ret;
 785                 af_mask = ret;
 786                 FOR_EACH_AUDIO_FORMAT(j) {
 787                         a = afi + j;
 788                         if ((af_mask & (1 << j)) == 0) /* no match */
 789                                 continue;
 790                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 791                         nw = a->num_writers;
 792                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 793                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 794                         a->writer_nums[nw] = writer_num;
 795                         a->writer_conf[nw] = wconf;
 796                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 797                                 nw, writer_names[writer_num]);
 798                         a->num_writers++;
 799                 }
 800         }
 801         /* Use default writer for audio formats which are not yet set up. */
 802         FOR_EACH_AUDIO_FORMAT(i) {
 803                 void *writer_conf;
 804                 int writer_num;
 805                 a = afi + i;
 806                 if (a->num_writers > 0)
 807                         continue; /* already set up */
 808                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 809                 a->writer_nums = para_malloc(sizeof(int));
 810                 a->writer_nums[0] = writer_num;
 811                 a->writer_conf = para_malloc(sizeof(void *));
 812                 a->writer_conf[0] = writer_conf;
 813                 a->num_writers = 1;
 814                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 815                         writer_names[writer_num]);
 816         }
 817         return 1;
 818 }
 819
 820 static int parse_receiver_args(void)
 821 {
 822         int i, ret, receiver_num;
 823         char *cmd = NULL;
 824         struct audio_format_info *a;
 825
 826         for (i = conf.receiver_given - 1; i >= 0; i--) {
 827                 char *arg;
 828                 int j, af_mask;
 829
 830                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 831                 if (ret < 0)
 832                         goto out;
 833                 af_mask = ret;
 834                 FOR_EACH_AUDIO_FORMAT(j) {
 835                         a = afi + j;
 836                         if ((af_mask & (1 << j)) == 0) /* no match */
 837                                 continue;
 838                         /*
 839                          * If multiple receivers are given for this audio format, the
 840                          * last one wins and we have to free the previous receiver
 841                          * config here. Since we are iterating backwards, the winning
 842                          * receiver arg is in fact the first one given.
 843                          */
 844                         if (a->receiver_conf)
 845                                 a->receiver->free_config(a->receiver_conf);
 846                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 847                         ret = -E_RECV_SYNTAX;
 848                         if (!a->receiver_conf)
 849                                 goto out;
 850                         a->receiver = receivers + receiver_num;
 851                 }
 852         }
 853         /*
 854          * Use the first available receiver with no arguments for those audio
 855          * formats for which no receiver was specified.
 856          */
 857         cmd = para_strdup(receivers[0].name);
 858         FOR_EACH_AUDIO_FORMAT(i) {
 859                 a = &afi[i];
 860                 if (a->receiver_conf)
 861                         continue;
 862                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 863                 if (!a->receiver_conf)
 864                         return -E_RECV_SYNTAX;
 865                 a->receiver = &receivers[receiver_num];
 866         }
 867         FOR_EACH_AUDIO_FORMAT(i) {
 868                 a = afi + i;
 869                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 870                         audio_formats[i], a->receiver->name);
 871         }
 872         ret = 1;
 873 out:
 874         free(cmd);
 875         return ret;
 876 }
 877
 878 static int init_default_filters(void)
 879 {
 880         int i, ret = 1;
 881
 882         FOR_EACH_AUDIO_FORMAT(i) {
 883                 struct audio_format_info *a = &afi[i];
 884                 char *tmp;
 885                 int j;
 886
 887                 if (a->num_filters)
 888                         continue; /* no default -- nothing to to */
 889                 /*
 890                  * udp and dccp streams are fec-encoded, so add fecdec as the
 891                  * first filter.
 892                  */
 893                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 894                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 895                         tmp = para_strdup("fecdec");
 896                         add_filter(i, tmp);
 897                         free(tmp);
 898                         if (ret < 0)
 899                                 goto out;
 900                 }
 901                 /* add "dec" to audio format name */
 902                 tmp = make_message("%sdec", audio_formats[i]);
 903                 for (j = 0; filters[j].name; j++)
 904                         if (!strcmp(tmp, filters[j].name))
 905                                 break;
 906                 free(tmp);
 907                 ret = -E_UNSUPPORTED_FILTER;
 908                 if (!filters[j].name)
 909                         goto out;
 910                 tmp = para_strdup(filters[j].name);
 911                 ret = add_filter(i, tmp);
 912                 free(tmp);
 913                 if (ret < 0)
 914                         goto out;
 915                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 916                         filters[j].name);
 917         }
 918 out:
 919         return ret;
 920 }
 921
 922 static int parse_filter_args(void)
 923 {
 924         int i, j, ret, af_mask, num_matches;
 925
 926         for (i = 0; i < conf.filter_given; i++) {
 927                 char *arg;
 928                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 929                 if (ret < 0)
 930                         goto out;
 931                 af_mask = ret;
 932                 num_matches = 0;
 933                 FOR_EACH_AUDIO_FORMAT(j) {
 934                         if ((af_mask & (1 << j)) == 0) /* no match */
 935                                 continue;
 936                         ret = add_filter(j, arg);
 937                         if (ret < 0)
 938                                 goto out;
 939                         num_matches++;
 940                 }
 941                 if (num_matches == 0)
 942                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 943                                 conf.filter_arg[i]);
 944         }
 945         ret = init_default_filters(); /* use default values for the rest */
 946 out:
 947         return ret;
 948 }
 949
 950 static int parse_stream_args(void)
 951 {
 952         int ret;
 953
 954         ret = parse_receiver_args();
 955         if (ret < 0)
 956                 return ret;
 957         ret = parse_filter_args();
 958         if (ret < 0)
 959                 return ret;
 960         ret = parse_writer_args();
 961         if (ret < 0)
 962                 return ret;
 963         return 1;
 964 }
 965
 966 /* does not unlink socket on errors */
 967 static int audiod_get_socket(void)
 968 {
 969         struct sockaddr_un unix_addr;
 970         int ret, fd;
 971
 972         if (conf.socket_given)
 973                 socket_name = para_strdup(conf.socket_arg);
 974         else {
 975                 char *hn = para_hostname();
 976                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 977                         hn);
 978                 free(hn);
 979         }
 980         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 981         if (conf.force_given)
 982                 unlink(socket_name);
 983         ret = create_local_socket(socket_name, &unix_addr,
 984                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 985         if (ret < 0)
 986                 goto err;
 987         fd = ret;
 988         if (listen(fd , 5) < 0) {
 989                 ret = -ERRNO_TO_PARA_ERROR(errno);
 990                 goto err;
 991         }
 992         ret = mark_fd_nonblocking(fd);
 993         if (ret < 0)
 994                 goto err;
 995         return fd;
 996 err:
 997         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 998         exit(EXIT_FAILURE);
 999 }
1000
1001 static void signal_pre_select(struct sched *s, struct task *t)
1002 {
1003         struct signal_task *st = container_of(t, struct signal_task, task);
1004         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1005 }
1006
1007 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1008 {
1009         int signum;
1010
1011         signum = para_next_signal(&s->rfds);
1012         switch (signum) {
1013         case SIGINT:
1014         case SIGTERM:
1015         case SIGHUP:
1016                 PARA_NOTICE_LOG("received signal %d\n", signum);
1017                 clean_exit(EXIT_FAILURE, "caught deadly signal");
1018         }
1019         return 0;
1020 }
1021
1022 static void signal_setup_default(struct signal_task *st)
1023 {
1024         st->task.pre_select = signal_pre_select;
1025         st->task.post_select = signal_post_select;
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;
1041         bool force = true;
1042
1043         ret = handle_connect(ct->fd, &s->rfds);
1044         if (ret < 0)
1045                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1046         else if (ret > 0)
1047                 goto dump;
1048
1049         /* if last status dump was less than 500ms ago, do nothing */
1050         delay.tv_sec = 0;
1051         delay.tv_usec = 500 * 1000;
1052         tv_add(&last_status_dump, &delay, &tmp);
1053         if (tv_diff(now, &tmp, NULL) < 0)
1054                 return 0;
1055
1056         /*
1057          * If last status dump was more than 5s ago, force update. Otherwise,
1058          * update only those items that have changed.
1059          */
1060         delay.tv_sec = 5;
1061         delay.tv_usec = 0;
1062         tv_add(&last_status_dump, &delay, &tmp);
1063         if (tv_diff(now, &tmp, NULL) < 0)
1064                 force = false;
1065 dump:
1066         audiod_status_dump(force);
1067         last_status_dump = *now;
1068         return 1;
1069 }
1070
1071 static void init_command_task(struct command_task *ct)
1072 {
1073         ct->task.pre_select = command_pre_select;
1074         ct->task.post_select = command_post_select;
1075         ct->task.error = 0;
1076         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1077         sprintf(ct->task.status, "command task");
1078 }
1079
1080 static void close_stat_pipe(void)
1081 {
1082         if (!stat_task->ct)
1083                 return;
1084         client_close(stat_task->ct);
1085         stat_task->ct = NULL;
1086         clear_and_dump_items();
1087         stat_task->length_seconds = 0;
1088         stat_task->offset_seconds = 0;
1089         stat_task->vss_status = 0;
1090         stat_task->current_audio_format_num = -1;
1091         audiod_status_dump(true);
1092 }
1093
1094 /* avoid busy loop if server is down */
1095 static void set_stat_task_restart_barrier(unsigned seconds)
1096 {
1097         struct timeval delay = {seconds, 0};
1098         tv_add(now, &delay, &stat_task->restart_barrier);
1099 }
1100
1101 static bool must_close_slot(int slot_num)
1102 {
1103         struct slot_info *s = &slot[slot_num];
1104         struct audio_format_info *a = afi + s->format;
1105         int i;
1106
1107         if (s->format < 0)
1108                 return false;
1109         if (s->receiver_node && s->receiver_node->task.error >= 0)
1110                 return false;
1111         for (i = 0; i < a->num_filters; i++)
1112                 if (s->fns && s->fns[i].task.error >= 0)
1113                         return false;
1114         if (a->num_writers > 0) {
1115                 for (i = 0; i < a->num_writers; i++)
1116                         if (s->wns && s->wns[i].task.error >= 0)
1117                                 return false;
1118         } else {
1119                 if (s->wns && s->wns[0].task.error >= 0)
1120                         return false;
1121         }
1122         return true;
1123 }
1124
1125 static void close_slot(int slot_num)
1126 {
1127         struct slot_info *s = slot + slot_num;
1128
1129         PARA_INFO_LOG("closing slot %d\n", slot_num);
1130         close_writers(s);
1131         close_filters(s);
1132         close_receiver(slot_num);
1133         clear_slot(slot_num);
1134 }
1135
1136 static void close_unused_slots(void)
1137 {
1138         int i;
1139
1140         FOR_EACH_SLOT(i)
1141                 if (must_close_slot(i))
1142                         close_slot(i);
1143 }
1144
1145 /**
1146  * Close the connection to para_server and exit.
1147  *
1148  * \param status The exit status which is passed to exit(3).
1149  * \param msg The log message
1150  *
1151  * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1152  * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1153  * or EXIT_FAILURE.
1154  *
1155  * \sa exit(3).
1156  */
1157 void __noreturn clean_exit(int status, const char *msg)
1158 {
1159         int i;
1160
1161         if (socket_name)
1162                 unlink(socket_name);
1163         close_stat_pipe();
1164         FOR_EACH_SLOT(i)
1165                 close_slot(i);
1166         audiod_cmdline_parser_free(&conf);
1167         close_stat_clients();
1168         PARA_EMERG_LOG("%s\n", msg);
1169         exit(status);
1170 }
1171
1172 /*
1173  * Check if any receivers/filters/writers need to be started and do so if
1174  * necessary.
1175  */
1176 static void start_stop_decoders(void)
1177 {
1178         int ret;
1179         struct slot_info *sl;
1180         struct audio_format_info *a;
1181
1182         close_unused_slots();
1183         if (audiod_status != AUDIOD_ON ||
1184                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1185                 return notify_receivers(E_NOT_PLAYING);
1186         if (!must_start_decoder())
1187                 return;
1188         ret = open_receiver(stat_task->current_audio_format_num);
1189         if (ret < 0) {
1190                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1191                 return;
1192         }
1193         sl = slot + ret;
1194         a = afi + sl->format;
1195         if (a->num_filters)
1196                 open_filters(sl);
1197         open_writers(sl);
1198         activate_grab_clients(&sched);
1199         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1200 }
1201
1202 static void status_pre_select(struct sched *s, struct task *t)
1203 {
1204         struct status_task *st = container_of(t, struct status_task, task);
1205         int i, ret, cafn = stat_task->current_audio_format_num;
1206
1207         if (must_start_decoder())
1208                 goto min_delay;
1209         FOR_EACH_SLOT(i)
1210                 if (must_close_slot(i))
1211                         goto min_delay;
1212         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1213         if (ret > 0)
1214                 goto min_delay;
1215         if (st->ct && audiod_status == AUDIOD_OFF)
1216                 goto min_delay;
1217         if (!st->ct && audiod_status != AUDIOD_OFF)
1218                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1219         if (cafn >= 0)
1220                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1221         /*
1222          * If para_server is playing we'd like to have a smooth time display
1223          * even if we are running in standby mode. So we request a timeout that
1224          * expires at the next full second.
1225          */
1226         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1227                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1228         return;
1229 min_delay:
1230         sched_min_delay(s);
1231 }
1232
1233 /* restart the client task if necessary */
1234 static int status_post_select(struct sched *s, struct task *t)
1235 {
1236         struct status_task *st = container_of(t, struct status_task, task);
1237
1238         if (audiod_status == AUDIOD_OFF) {
1239                 if (!st->ct)
1240                         goto out;
1241                 if (st->ct->task.error >= 0) {
1242                         task_notify(&st->ct->task, E_AUDIOD_OFF);
1243                         goto out;
1244                 }
1245                 close_stat_pipe();
1246                 st->clock_diff_count = conf.clock_diff_count_arg;
1247                 goto out;
1248         }
1249         if (st->ct) {
1250                 char *buf;
1251                 size_t sz;
1252                 int ret;
1253
1254                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1255                 if (ret < 0) {
1256                         close_stat_pipe();
1257                         goto out;
1258                 }
1259                 if (st->ct->status != CL_EXECUTING)
1260                         goto out;
1261                 if (ret == 0) {
1262                         struct timeval diff;
1263                         tv_diff(now, &st->last_status_read, &diff);
1264                         if (diff.tv_sec > 61)
1265                                 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1266                         goto out;
1267                 }
1268                 btr_merge(st->btrn, st->min_iqs);
1269                 sz = btr_next_buffer(st->btrn, &buf);
1270                 ret = for_each_stat_item(buf, sz, update_item);
1271                 if (ret < 0) {
1272                         task_notify(&st->ct->task, -ret);
1273                         goto out;
1274                 }
1275                 if (sz != ret) {
1276                         btr_consume(st->btrn, sz - ret);
1277                         st->last_status_read = *now;
1278                         st->min_iqs = 0;
1279                 } else /* current status item crosses buffers */
1280                         st->min_iqs = sz + 1;
1281                 goto out;
1282         }
1283         btr_drain(st->btrn);
1284         st->current_audio_format_num = -1;
1285         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1286                 goto out;
1287         if (st->clock_diff_count) { /* get status only one time */
1288                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1289                 int argc = 5;
1290                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1291                 st->clock_diff_count--;
1292                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1293                 set_stat_task_restart_barrier(2);
1294
1295         } else {
1296                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1297                 int argc = 4;
1298                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1299                 set_stat_task_restart_barrier(5);
1300         }
1301         free(stat_item_values[SI_BASENAME]);
1302         stat_item_values[SI_BASENAME] = para_strdup(
1303                 "no connection to para_server");
1304         stat_client_write_item(SI_BASENAME);
1305         st->last_status_read = *now;
1306 out:
1307         start_stop_decoders();
1308         return 0;
1309 }
1310
1311 static void init_status_task(struct status_task *st)
1312 {
1313         memset(st, 0, sizeof(struct status_task));
1314         st->task.pre_select = status_pre_select;
1315         st->task.post_select = status_post_select;
1316         st->sa_time_diff_sign = 1;
1317         st->clock_diff_count = conf.clock_diff_count_arg;
1318         st->current_audio_format_num = -1;
1319         sprintf(st->task.status, "stat");
1320         st->btrn = btr_new_node(&(struct btr_node_description)
1321                 EMBRACE(.name = "stat"));
1322 }
1323
1324 static void set_initial_status(void)
1325 {
1326         audiod_status = AUDIOD_ON;
1327         if (!conf.mode_given)
1328                 return;
1329         if (!strcmp(conf.mode_arg, "sb")) {
1330                 audiod_status = AUDIOD_STANDBY;
1331                 return;
1332         }
1333         if (!strcmp(conf.mode_arg, "off")) {
1334                 audiod_status = AUDIOD_OFF;
1335                 return;
1336         }
1337         if (strcmp(conf.mode_arg, "on"))
1338                 PARA_WARNING_LOG("invalid mode\n");
1339 }
1340
1341 __noreturn static void print_help_and_die(void)
1342 {
1343         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1344         bool d = conf.detailed_help_given;
1345         unsigned flags;
1346
1347         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1348         ggo_print_help(&h, flags);
1349
1350         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1351         print_receiver_helps(flags);
1352         print_filter_helps(flags);
1353         print_writer_helps(flags);
1354         exit(0);
1355 }
1356
1357 static void init_colors_or_die(void)
1358 {
1359         int i;
1360
1361         if (!want_colors())
1362                 return;
1363         daemon_set_default_log_colors();
1364         daemon_set_flag(DF_COLOR_LOG);
1365         for (i = 0; i < conf.log_color_given; i++)
1366                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1367 }
1368
1369 /**
1370  * the main function of para_audiod
1371  *
1372  * \param argc usual argument count
1373  * \param argv usual argument vector
1374  *
1375  * \return EXIT_SUCCESS or EXIT_FAILURE
1376  *
1377  * \sa para_audiod(1)
1378  * */
1379 int main(int argc, char *argv[])
1380 {
1381         int ret, i;
1382         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1383         struct audiod_cmdline_parser_params params = {
1384                 .override = 0,
1385                 .initialize = 1,
1386                 .check_required = 0,
1387                 .check_ambiguity = 0,
1388                 .print_errors = 1
1389         };
1390
1391         valid_fd_012();
1392         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1393         daemon_set_loglevel(conf.loglevel_arg);
1394         version_handle_flag("audiod", conf.version_given);
1395         /* init receivers/filters/writers early to make help work */
1396         recv_init();
1397         filter_init();
1398         writer_init();
1399         if (conf.help_given || conf.detailed_help_given)
1400                 print_help_and_die();
1401         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1402         parse_config_or_die();
1403         init_colors_or_die();
1404         init_random_seed_or_die();
1405         daemon_set_flag(DF_LOG_TIME);
1406         daemon_set_flag(DF_LOG_HOSTNAME);
1407         daemon_set_flag(DF_LOG_LL);
1408         if (conf.log_timing_given)
1409                 daemon_set_flag(DF_LOG_TIMING);
1410         if (conf.logfile_given) {
1411                 daemon_set_logfile(conf.logfile_arg);
1412                 daemon_open_log_or_die();
1413         }
1414         ret = parse_stream_args();
1415         if (ret < 0) {
1416                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1417                 exit(EXIT_FAILURE);
1418         }
1419         log_welcome("para_audiod");
1420         set_server_start_time(NULL);
1421         set_initial_status();
1422         FOR_EACH_SLOT(i)
1423                 clear_slot(i);
1424         setup_signal_handling();
1425         signal_setup_default(sig_task);
1426
1427         init_status_task(stat_task);
1428         init_command_task(cmd_task);
1429
1430         if (conf.daemon_given)
1431                 daemonize(false /* parent exits immediately */);
1432
1433         register_task(&sched, &sig_task->task);
1434         register_task(&sched, &cmd_task->task);
1435         register_task(&sched, &stat_task->task);
1436         sched.default_timeout.tv_sec = 2;
1437         sched.default_timeout.tv_usec = 999 * 1000;
1438         ret = schedule(&sched);
1439
1440         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1441         return EXIT_FAILURE;
1442 }