audiod.c

   1 /*
   2  * Copyright (C) 2005-2014 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c The paraslash's audio daemon. */
   8
   9 #include <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "crypt.h"
  21 #include "audiod.cmdline.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "ggo.h"
  25 #include "buffer_tree.h"
  26 #include "recv.h"
  27 #include "filter.h"
  28 #include "grab_client.h"
  29 #include "client.cmdline.h"
  30 #include "client.h"
  31 #include "audiod.h"
  32 #include "net.h"
  33 #include "daemon.h"
  34 #include "string.h"
  35 #include "fd.h"
  36 #include "write.h"
  37 #include "write_common.h"
  38 #include "signal.h"
  39 #include "version.h"
  40
  41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  46
  47 DEFINE_RECEIVER_ARRAY;
  48
  49 /** Defines how audiod handles one supported audio format. */
  50 struct audio_format_info {
  51         /** pointer to the receiver for this audio format */
  52         struct receiver *receiver;
  53         /** the receiver configuration */
  54         void *receiver_conf;
  55         /** the number of filters that should be activated for this audio format */
  56         unsigned int num_filters;
  57         /** Array of filter numbers to be activated. */
  58         unsigned *filter_nums;
  59         /** Pointer to the array of filter configurations. */
  60         void **filter_conf;
  61         /** the number of filters that should be activated for this audio format */
  62         unsigned int num_writers;
  63         /** Array of writer numbers to be activated. */
  64         int *writer_nums;
  65         /** pointer to the array of writer configurations */
  66         void **writer_conf;
  67         /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  73  * be associated with a receiver/filter/writer triple. This array holds all
  74  * information on the status of these slots.
  75  *
  76  * \sa struct slot_info
  77  * */
  78 struct slot_info slot[MAX_STREAM_SLOTS];
  79
  80 /** The vss status flags audiod is interested in. */
  81 enum vss_status_flags {
  82         /** Whether the 'N' flag is set. */
  83         VSS_STATUS_FLAG_NEXT = 1,
  84         /** The 'P' flag is set. */
  85         VSS_STATUS_FLAG_PLAYING = 2,
  86 };
  87
  88 /**
  89  * The scheduler instance of para_audiod.
  90  *
  91  * This is needed also in audiod_command.c (for the tasks command), so it can
  92  * not be made static.
  93  */
  94 struct sched sched = {.max_fileno = 0};
  95
  96 /* The task for obtaining para_server's status (para_client stat). */
  97 struct status_task {
  98         /** The associated task structure of audiod. */
  99         struct task *task;
 100         /** Client data associated with the stat task. */
 101         struct client_task *ct;
 102         /** Do not restart client command until this time. */
 103         struct timeval restart_barrier;
 104         /** Last time we received status data from para_server. */
 105         struct timeval last_status_read;
 106         size_t min_iqs;
 107         /** The offset value announced by para_server. */
 108         int offset_seconds;
 109         /** The length of the current audio file as announced by para_server. */
 110         int length_seconds;
 111         /** The start of the current stream from the view of para_server. */
 112         struct timeval server_stream_start;
 113         /** The average time deviation between para_server and para_audiod. */
 114         struct timeval sa_time_diff;
 115         /** Whether client time is ahead of server time. */
 116         int sa_time_diff_sign;
 117         /** The 'P' and the 'N' flags as announced by para_server. */
 118         enum vss_status_flags vss_status;
 119         /** Number of times the clock difference is to be checked. */
 120         unsigned clock_diff_count;
 121         /** When to start the next check for clock difference. */
 122         struct timeval clock_diff_barrier;
 123         /** Number of the audio format as announced by para_server. */
 124         int current_audio_format_num;
 125         /* The status task btrn is the child of the client task. */
 126         struct btr_node *btrn;
 127 };
 128
 129 /** The array of status items sent by para_server. */
 130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 131
 132 /**
 133  * the current mode of operation of which can be changed by the on/off/cycle
 134  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 135  */
 136 int audiod_status = AUDIOD_ON;
 137
 138 /**
 139  * the gengetopt args_info struct that holds information on all command line
 140  * arguments
 141  */
 142 struct audiod_args_info conf;
 143
 144 static char *socket_name;
 145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 146
 147 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 148
 149 static struct status_task status_task_struct;
 150
 151 /**
 152  * the task that calls the status command of para_server
 153  *
 154  * \sa struct status_task
 155  */
 156 static struct status_task *stat_task = &status_task_struct;
 157
 158 /**
 159  * the task for handling audiod commands
 160  *
 161  * \sa struct task, struct sched
 162  */
 163 struct command_task {
 164         /** the local listening socket */
 165         int fd;
 166         /** the associated task structure */
 167         struct task *task;
 168 };
 169
 170 /** iterate over all supported audio formats */
 171 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 172
 173 /**
 174  * Get the audio format number.
 175  *
 176  * \param name The name of the audio format.
 177  *
 178  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 179  * \a name is not a supported audio format.
 180  */
 181 static int get_audio_format_num(const char *name)
 182 {
 183         int i;
 184
 185         while (para_isspace(*name))
 186                 name++;
 187         FOR_EACH_AUDIO_FORMAT(i)
 188                 if (!strcmp(name, audio_formats[i]))
 189                         return i;
 190         return -E_UNSUPPORTED_AUDIO_FORMAT;
 191 }
 192
 193 static int get_matching_audio_format_nums(const char *re)
 194 {
 195         int i, ret;
 196         regex_t preg;
 197
 198         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 199         if (ret < 0)
 200                 return ret;
 201         ret = 0;
 202         FOR_EACH_AUDIO_FORMAT(i)
 203                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 204                         ret |= (1 << i);
 205         regfree(&preg);
 206         return ret;
 207 }
 208
 209 /**
 210  * Compute the play time based on information of the given slot.
 211  *
 212  * \param slot_num The slot number (negative means: no slot).
 213  *
 214  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 215  * from the status items received from para_server and the start time of the
 216  * (first) writer of the given slot.
 217  *
 218  * It has to take into account that the stream was probably not started at
 219  * the beginning of the file, that the clock between the server and the client
 220  * host may differ and that playback of the stream was delayed, e.g. because
 221  * the prebuffer filter is used in the filter configuration of the given slot.
 222  *
 223  * If no writer is active in the given slot, or \a slot_num is negative
 224  * (indicating that para_audiod runs in standby mode), an approximation based
 225  * only on the status items is computed and the returned string is prefixed
 226  * with "~".
 227  *
 228  * \return A string that must be freed by the caller.
 229  */
 230 char *get_time_string(int slot_num)
 231 {
 232         int ret, seconds = 0, length;
 233         struct timeval *tmp, sum, sss, /* server stream start */
 234                 rstime, /* receiver start time */
 235                 wstime, /* writer start time */
 236                 wtime, /* now - writer start */
 237                 rskip; /* receiver start - sss */
 238         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 239         char *msg;
 240
 241         if (audiod_status == AUDIOD_OFF)
 242                 goto empty;
 243         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 244                 if (stat_task->length_seconds) /* paused */
 245                         return NULL;
 246                 goto empty; /* stopped */
 247         }
 248         if (audiod_status == AUDIOD_ON && !s)
 249                 goto empty;
 250         /*
 251          * Valid status items and playing, set length and tmp to the stream
 252          * start. We use the slot info and fall back to the info from current
 253          * status items if no slot info is available.
 254          */
 255         length = stat_task->length_seconds;
 256         tmp = &stat_task->server_stream_start;
 257         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 258                 btr_get_node_start(s->wns[0].btrn, &wstime);
 259                 if (wstime.tv_sec != 0) { /* writer wrote something */
 260                         if (s->server_stream_start.tv_sec == 0) {
 261                                 /* copy status info to slot */
 262                                 s->server_stream_start = stat_task->server_stream_start;
 263                                 s->offset_seconds = stat_task->offset_seconds;
 264                                 s->seconds_total = stat_task->length_seconds;
 265                         }
 266                         length = s->seconds_total;
 267                         tmp = &s->server_stream_start;
 268                 }
 269         }
 270         if (stat_task->sa_time_diff_sign > 0)
 271                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 272         else
 273                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 274         if (!s || !s->wns || !s->wns[0].btrn) {
 275                 struct timeval diff;
 276                 tv_diff(now, &sss, &diff);
 277                 seconds = diff.tv_sec + stat_task->offset_seconds;
 278                 goto out;
 279         }
 280         tv_diff(now, &wstime, &wtime);
 281         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 282         seconds = s->offset_seconds;
 283         if (s->receiver_node->btrn) {
 284                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 285                 ret = tv_diff(&rstime, &sss, &rskip);
 286                 if (ret > 0) { /* audiod was started in the middle of the stream */
 287                         tv_add(&wtime, &rskip, &sum);
 288                         seconds += sum.tv_sec;
 289                 } else
 290                         seconds += wtime.tv_sec;
 291         } else
 292                 seconds += wtime.tv_sec;
 293 out:
 294         seconds = PARA_MIN(seconds, length);
 295         seconds = PARA_MAX(seconds, 0);
 296         msg = make_message(
 297                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 298                 s? "" : "~",
 299                 seconds / 60,
 300                 seconds % 60,
 301                 (length - seconds) / 60,
 302                 (length - seconds) % 60,
 303                 length? (seconds * 100 + length / 2) / length : 0,
 304                 length / 60,
 305                 length % 60
 306         );
 307         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 308         return msg;
 309 empty:
 310         return para_strdup(NULL);
 311 }
 312
 313 static int want_colors(void)
 314 {
 315         if (conf.color_arg == color_arg_no)
 316                 return 0;
 317         if (conf.color_arg == color_arg_yes)
 318                 return 1;
 319         if (conf.logfile_given)
 320                 return 0;
 321         return isatty(STDERR_FILENO);
 322 }
 323
 324 static void parse_config_or_die(void)
 325 {
 326         int ret;
 327         char *config_file;
 328         struct audiod_cmdline_parser_params params = {
 329                 .override = 0,
 330                 .initialize = 0,
 331                 .check_required = 1,
 332                 .check_ambiguity = 0,
 333                 .print_errors = 1
 334         };
 335
 336         if (conf.config_file_given)
 337                 config_file = para_strdup(conf.config_file_arg);
 338         else {
 339                 char *home = para_homedir();
 340                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 341                 free(home);
 342         }
 343         ret = file_exists(config_file);
 344         if (conf.config_file_given && !ret) {
 345                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 346                 goto err;
 347         }
 348         if (ret) {
 349                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 350                 daemon_set_loglevel(conf.loglevel_arg);
 351         }
 352         free(config_file);
 353         return;
 354 err:
 355         free(config_file);
 356         exit(EXIT_FAILURE);
 357 }
 358
 359 static void setup_signal_handling(void)
 360 {
 361         sig_task->fd = para_signal_init();
 362         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 363         para_install_sighandler(SIGINT);
 364         para_install_sighandler(SIGTERM);
 365         para_install_sighandler(SIGHUP);
 366         para_sigaction(SIGPIPE, SIG_IGN);
 367 }
 368
 369 static void clear_slot(int slot_num)
 370 {
 371         struct slot_info *s = &slot[slot_num];
 372
 373         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 374         memset(s, 0, sizeof(struct slot_info));
 375         s->format = -1;
 376 }
 377
 378 static void close_receiver(int slot_num)
 379 {
 380         struct slot_info *s = &slot[slot_num];
 381         struct audio_format_info *a;
 382
 383         if (s->format < 0 || !s->receiver_node)
 384                 return;
 385         a = &afi[s->format];
 386         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 387                 audio_formats[s->format], slot_num);
 388         a->receiver->close(s->receiver_node);
 389         btr_remove_node(&s->receiver_node->btrn);
 390         task_reap(&s->receiver_node->task);
 391         free(s->receiver_node);
 392         s->receiver_node = NULL;
 393         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 394                 &a->restart_barrier);
 395 }
 396
 397 static void writer_cleanup(struct writer_node *wn)
 398 {
 399         struct writer *w;
 400
 401         if (!wn)
 402                 return;
 403         w = writers + wn->writer_num;
 404         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 405         w->close(wn);
 406         btr_remove_node(&wn->btrn);
 407         task_reap(&wn->task);
 408 }
 409
 410 static void close_writers(struct slot_info *s)
 411 {
 412         struct audio_format_info *a;
 413         int i;
 414
 415         if (s->format < 0)
 416                 return;
 417         assert(s->wns);
 418         a = afi + s->format;
 419         if (a->num_writers == 0)
 420                 writer_cleanup(s->wns);
 421         else {
 422                 for (i = 0; i < a->num_writers; i++)
 423                         writer_cleanup(s->wns + i);
 424         }
 425         free(s->wns);
 426         s->wns = NULL;
 427 }
 428
 429 static void close_filters(struct slot_info *s)
 430 {
 431         int i;
 432         struct audio_format_info *a = afi + s->format;
 433         if (a->num_filters == 0)
 434                 return;
 435         for (i = a->num_filters - 1; i >= 0; i--) {
 436                 struct filter_node *fn = s->fns + i;
 437                 struct filter *f;
 438
 439                 if (!fn)
 440                         continue;
 441                 f = filters + fn->filter_num;
 442                 if (f->close)
 443                         f->close(fn);
 444                 btr_remove_node(&fn->btrn);
 445                 task_reap(&fn->task);
 446         }
 447         free(s->fns);
 448         s->fns = NULL;
 449 }
 450
 451 static void notify_receivers(int error)
 452 {
 453         int i;
 454
 455         FOR_EACH_SLOT(i) {
 456                 struct slot_info *s = slot + i;
 457                 if (s->format < 0)
 458                         continue;
 459                 if (!s->receiver_node)
 460                         continue;
 461                 task_notify(s->receiver_node->task, error);
 462         }
 463 }
 464
 465 static int get_empty_slot(void)
 466 {
 467         int i;
 468         struct slot_info *s;
 469
 470         FOR_EACH_SLOT(i) {
 471                 s = &slot[i];
 472                 if (s->format < 0) {
 473                         clear_slot(i);
 474                         return i;
 475                 }
 476                 if (s->wns || s->receiver_node || s->fns)
 477                         continue;
 478                 clear_slot(i);
 479                 return i;
 480         }
 481         return -E_NO_MORE_SLOTS;
 482 }
 483
 484 static void open_filters(struct slot_info *s)
 485 {
 486         struct audio_format_info *a = afi + s->format;
 487         struct filter_node *fn;
 488         int nf = a->num_filters;
 489         struct btr_node *parent;
 490         int i;
 491
 492         if (nf == 0)
 493                 return;
 494         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 495         assert(s->fns == NULL);
 496         s->fns = para_calloc(nf * sizeof(struct filter_node));
 497         parent = s->receiver_node->btrn;
 498         for (i = 0; i < nf; i++) {
 499                 char buf[20];
 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->btrn = btr_new_node(&(struct btr_node_description)
 505                         EMBRACE(.name = f->name, .parent = parent,
 506                                 .handler = f->execute, .context = fn));
 507
 508                 f->open(fn);
 509                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 510                 fn->task = task_register(&(struct task_info) {
 511                         .name = buf,
 512                         .pre_select = f->pre_select,
 513                         .post_select = f->post_select,
 514                         .context = fn,
 515                 }, &sched);
 516                 parent = fn->btrn;
 517                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 518                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 519         }
 520 }
 521
 522 static void open_writers(struct slot_info *s)
 523 {
 524         int i;
 525         struct audio_format_info *a = afi + s->format;
 526         struct writer_node *wn;
 527         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 528
 529         assert(s->wns == NULL);
 530         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 531                 * sizeof(struct writer_node));
 532         for (i = 0; i < a->num_writers; i++) {
 533                 wn = s->wns + i;
 534                 wn->conf = a->writer_conf[i];
 535                 wn->writer_num = a->writer_nums[i];
 536                 register_writer_node(wn, parent, &sched);
 537                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 538                         writer_names[a->writer_nums[i]], (int)(s - slot));
 539         }
 540 }
 541
 542 /* returns slot num on success */
 543 static int open_receiver(int format)
 544 {
 545         struct audio_format_info *a = &afi[format];
 546         struct slot_info *s;
 547         int ret, slot_num;
 548         struct receiver *r = a->receiver;
 549         struct receiver_node *rn;
 550
 551         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 552         ret = get_empty_slot();
 553         if (ret < 0)
 554                 return ret;
 555         slot_num = ret;
 556         rn = para_calloc(sizeof(*rn));
 557         rn->receiver = r;
 558         rn->conf = a->receiver_conf;
 559         rn->btrn = btr_new_node(&(struct btr_node_description)
 560                 EMBRACE(.name = r->name, .context = rn));
 561         ret = r->open(rn);
 562         if (ret < 0) {
 563                 btr_remove_node(&rn->btrn);
 564                 free(rn);
 565                 return ret;
 566         }
 567         s = &slot[slot_num];
 568         s->format = format;
 569         s->receiver_node = rn;
 570         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 571                 audio_formats[format], r->name, slot_num);
 572         rn->task = task_register(&(struct task_info) {
 573                 .name = r->name,
 574                 .pre_select = r->pre_select,
 575                 .post_select = r->post_select,
 576                 .context = rn,
 577         }, &sched);
 578         return slot_num;
 579 }
 580
 581 static bool receiver_running(void)
 582 {
 583         int i;
 584         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 585
 586         FOR_EACH_SLOT(i) {
 587                 struct slot_info *s = &slot[i];
 588                 long unsigned ss2 = s->server_stream_start.tv_sec;
 589
 590                 if (!s->receiver_node)
 591                         continue;
 592                 if (task_status(s->receiver_node->task) >= 0)
 593                         return true;
 594                 if (ss1 == ss2)
 595                         return true;
 596         }
 597         return false;
 598 }
 599
 600 /**
 601  * Return the root node of the current buffer tree.
 602  *
 603  * This is only used for stream grabbing.
 604  *
 605  * \return \p NULL if no slot is currently active. If more than one buffer tree
 606  * exists, the node corresponding to the most recently started receiver is
 607  * returned.
 608  */
 609 struct btr_node *audiod_get_btr_root(void)
 610 {
 611         int i, newest_slot = -1;
 612         struct timeval newest_rstime = {0, 0};
 613
 614         FOR_EACH_SLOT(i) {
 615                 struct slot_info *s = &slot[i];
 616                 struct timeval rstime;
 617                 if (!s->receiver_node)
 618                         continue;
 619                 if (task_status(s->receiver_node->task) < 0)
 620                         continue;
 621                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 622                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 623                         continue;
 624                 newest_rstime = rstime;
 625                 newest_slot = i;
 626         }
 627         if (newest_slot == -1)
 628                 return NULL;
 629         return slot[newest_slot].receiver_node->btrn;
 630 }
 631
 632 /* whether a new instance of a decoder should be started. */
 633 static bool must_start_decoder(void)
 634 {
 635         int cafn = stat_task->current_audio_format_num;
 636         unsigned vs = stat_task->vss_status;
 637
 638         if (audiod_status != AUDIOD_ON)
 639                 return false;
 640         if (cafn < 0)
 641                 return false;
 642         if (!stat_task->ct)
 643                 return false;
 644         if (vs & VSS_STATUS_FLAG_NEXT)
 645                 return false;
 646         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 647                 return false;
 648         if (receiver_running())
 649                 return false;
 650         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 651                 return false;
 652         return true;
 653 }
 654
 655 static void compute_time_diff(const struct timeval *status_time)
 656 {
 657         struct timeval tmp, diff;
 658         static unsigned count;
 659         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 660         const struct timeval max_deviation = {0, 500 * 1000};
 661         const int time_smooth = 5;
 662
 663         sign = tv_diff(status_time, now, &diff);
 664 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 665 //                      sign, sa_time_diff_sign);
 666         if (!count) {
 667                 sa_time_diff_sign = sign;
 668                 stat_task->sa_time_diff = diff;
 669                 count++;
 670                 goto out;
 671         }
 672         if (count > 5) {
 673                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 674                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 675                         PARA_WARNING_LOG("time diff jump: %lims\n",
 676                                 s * tv2ms(&tmp));
 677         }
 678         count++;
 679         sa_time_diff_sign = tv_convex_combination(
 680                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 681                 count > 10? sign : sign * time_smooth, &diff,
 682                 &tmp);
 683         stat_task->sa_time_diff = tmp;
 684         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 685                 sign < 0? "-" : "+",
 686                 tv2ms(&diff),
 687                 sa_time_diff_sign < 0? "-" : "+",
 688                 tv2ms(&stat_task->sa_time_diff)
 689         );
 690 out:
 691         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 692 }
 693
 694 static int update_item(int itemnum, char *buf)
 695 {
 696         long unsigned sec, usec;
 697
 698         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 699                 return 1;
 700         free(stat_item_values[itemnum]);
 701         stat_item_values[itemnum] = para_strdup(buf);
 702         stat_client_write_item(itemnum);
 703         switch (itemnum) {
 704         case SI_STATUS_FLAGS:
 705                 stat_task->vss_status = 0;
 706                 if (strchr(buf, 'N'))
 707                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 708                 if (strchr(buf, 'P'))
 709                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 710                 break;
 711         case SI_OFFSET:
 712                 stat_task->offset_seconds = atoi(buf);
 713                 break;
 714         case SI_SECONDS_TOTAL:
 715                 stat_task->length_seconds = atoi(buf);
 716                 break;
 717         case SI_STREAM_START:
 718                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 719                         stat_task->server_stream_start.tv_sec = sec;
 720                         stat_task->server_stream_start.tv_usec = usec;
 721                 }
 722                 break;
 723         case SI_CURRENT_TIME:
 724                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 725                         struct timeval tv = {sec, usec};
 726                         compute_time_diff(&tv);
 727                 }
 728                 break;
 729         case SI_FORMAT:
 730                 stat_task->current_audio_format_num
 731                         = get_audio_format_num(buf);
 732         }
 733         return 1;
 734 }
 735
 736 static int parse_stream_command(const char *txt, char **cmd)
 737 {
 738         int ret, len;
 739         char *re, *p = strchr(txt, ':');
 740
 741         if (!p)
 742                 return -E_MISSING_COLON;
 743         *cmd = p + 1;
 744         len = p - txt;
 745         re = malloc(len + 1);
 746         strncpy(re, txt, len);
 747         re[len] = '\0';
 748         ret = get_matching_audio_format_nums(re);
 749         free(re);
 750         return ret;
 751 }
 752
 753 static int add_filter(int format, char *cmdline)
 754 {
 755         struct audio_format_info *a = &afi[format];
 756         int filter_num, nf = a->num_filters;
 757         void *cfg;
 758
 759         filter_num = check_filter_arg(cmdline, &cfg);
 760         if (filter_num < 0)
 761                 return filter_num;
 762         a->filter_conf = para_realloc(a->filter_conf,
 763                 (nf + 1) * sizeof(void *));
 764         a->filter_nums = para_realloc(a->filter_nums,
 765                 (nf + 1) * sizeof(unsigned));
 766         a->filter_nums[nf] = filter_num;
 767         a->filter_conf[nf] = cfg;
 768         a->num_filters++;
 769         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 770                 filters[filter_num].name);
 771         return filter_num;
 772 }
 773
 774 static int parse_writer_args(void)
 775 {
 776         int i, ret;
 777         char *cmd;
 778         struct audio_format_info *a;
 779
 780         for (i = 0; i < conf.writer_given; i++) {
 781                 void *wconf;
 782                 int j, nw, writer_num, af_mask;
 783
 784                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 785                 if (ret < 0)
 786                         return ret;
 787                 af_mask = ret;
 788                 FOR_EACH_AUDIO_FORMAT(j) {
 789                         a = afi + j;
 790                         if ((af_mask & (1 << j)) == 0) /* no match */
 791                                 continue;
 792                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 793                         nw = a->num_writers;
 794                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 795                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 796                         a->writer_nums[nw] = writer_num;
 797                         a->writer_conf[nw] = wconf;
 798                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 799                                 nw, writer_names[writer_num]);
 800                         a->num_writers++;
 801                 }
 802         }
 803         /* Use default writer for audio formats which are not yet set up. */
 804         FOR_EACH_AUDIO_FORMAT(i) {
 805                 void *writer_conf;
 806                 int writer_num;
 807                 a = afi + i;
 808                 if (a->num_writers > 0)
 809                         continue; /* already set up */
 810                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 811                 a->writer_nums = para_malloc(sizeof(int));
 812                 a->writer_nums[0] = writer_num;
 813                 a->writer_conf = para_malloc(sizeof(void *));
 814                 a->writer_conf[0] = writer_conf;
 815                 a->num_writers = 1;
 816                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 817                         writer_names[writer_num]);
 818         }
 819         return 1;
 820 }
 821
 822 static int parse_receiver_args(void)
 823 {
 824         int i, ret, receiver_num;
 825         char *cmd = NULL;
 826         struct audio_format_info *a;
 827
 828         for (i = conf.receiver_given - 1; i >= 0; i--) {
 829                 char *arg;
 830                 int j, af_mask;
 831
 832                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 833                 if (ret < 0)
 834                         goto out;
 835                 af_mask = ret;
 836                 FOR_EACH_AUDIO_FORMAT(j) {
 837                         a = afi + j;
 838                         if ((af_mask & (1 << j)) == 0) /* no match */
 839                                 continue;
 840                         /*
 841                          * If multiple receivers are given for this audio format, the
 842                          * last one wins and we have to free the previous receiver
 843                          * config here. Since we are iterating backwards, the winning
 844                          * receiver arg is in fact the first one given.
 845                          */
 846                         if (a->receiver_conf)
 847                                 a->receiver->free_config(a->receiver_conf);
 848                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 849                         ret = -E_RECV_SYNTAX;
 850                         if (!a->receiver_conf)
 851                                 goto out;
 852                         a->receiver = receivers + receiver_num;
 853                 }
 854         }
 855         /*
 856          * Use the first available receiver with no arguments for those audio
 857          * formats for which no receiver was specified.
 858          */
 859         cmd = para_strdup(receivers[0].name);
 860         FOR_EACH_AUDIO_FORMAT(i) {
 861                 a = &afi[i];
 862                 if (a->receiver_conf)
 863                         continue;
 864                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 865                 if (!a->receiver_conf)
 866                         return -E_RECV_SYNTAX;
 867                 a->receiver = &receivers[receiver_num];
 868         }
 869         FOR_EACH_AUDIO_FORMAT(i) {
 870                 a = afi + i;
 871                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 872                         audio_formats[i], a->receiver->name);
 873         }
 874         ret = 1;
 875 out:
 876         free(cmd);
 877         return ret;
 878 }
 879
 880 static int init_default_filters(void)
 881 {
 882         int i, ret = 1;
 883
 884         FOR_EACH_AUDIO_FORMAT(i) {
 885                 struct audio_format_info *a = &afi[i];
 886                 char *tmp;
 887                 int j;
 888
 889                 if (a->num_filters)
 890                         continue; /* no default -- nothing to to */
 891                 /*
 892                  * udp and dccp streams are fec-encoded, so add fecdec as the
 893                  * first filter.
 894                  */
 895                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 896                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 897                         tmp = para_strdup("fecdec");
 898                         add_filter(i, tmp);
 899                         free(tmp);
 900                         if (ret < 0)
 901                                 goto out;
 902                 }
 903                 /* add "dec" to audio format name */
 904                 tmp = make_message("%sdec", audio_formats[i]);
 905                 for (j = 0; filters[j].name; j++)
 906                         if (!strcmp(tmp, filters[j].name))
 907                                 break;
 908                 free(tmp);
 909                 ret = -E_UNSUPPORTED_FILTER;
 910                 if (!filters[j].name)
 911                         goto out;
 912                 tmp = para_strdup(filters[j].name);
 913                 ret = add_filter(i, tmp);
 914                 free(tmp);
 915                 if (ret < 0)
 916                         goto out;
 917                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 918                         filters[j].name);
 919         }
 920 out:
 921         return ret;
 922 }
 923
 924 static int parse_filter_args(void)
 925 {
 926         int i, j, ret, af_mask, num_matches;
 927
 928         for (i = 0; i < conf.filter_given; i++) {
 929                 char *arg;
 930                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 931                 if (ret < 0)
 932                         goto out;
 933                 af_mask = ret;
 934                 num_matches = 0;
 935                 FOR_EACH_AUDIO_FORMAT(j) {
 936                         if ((af_mask & (1 << j)) == 0) /* no match */
 937                                 continue;
 938                         ret = add_filter(j, arg);
 939                         if (ret < 0)
 940                                 goto out;
 941                         num_matches++;
 942                 }
 943                 if (num_matches == 0)
 944                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 945                                 conf.filter_arg[i]);
 946         }
 947         ret = init_default_filters(); /* use default values for the rest */
 948 out:
 949         return ret;
 950 }
 951
 952 static int parse_stream_args(void)
 953 {
 954         int ret;
 955
 956         ret = parse_receiver_args();
 957         if (ret < 0)
 958                 return ret;
 959         ret = parse_filter_args();
 960         if (ret < 0)
 961                 return ret;
 962         ret = parse_writer_args();
 963         if (ret < 0)
 964                 return ret;
 965         return 1;
 966 }
 967
 968 /* does not unlink socket on errors */
 969 static int audiod_get_socket(void)
 970 {
 971         struct sockaddr_un unix_addr;
 972         int ret, fd;
 973
 974         if (conf.socket_given)
 975                 socket_name = para_strdup(conf.socket_arg);
 976         else {
 977                 char *hn = para_hostname();
 978                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 979                         hn);
 980                 free(hn);
 981         }
 982         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 983         if (conf.force_given)
 984                 unlink(socket_name);
 985         ret = create_local_socket(socket_name, &unix_addr,
 986                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 987         if (ret < 0)
 988                 goto err;
 989         fd = ret;
 990         if (listen(fd , 5) < 0) {
 991                 ret = -ERRNO_TO_PARA_ERROR(errno);
 992                 goto err;
 993         }
 994         ret = mark_fd_nonblocking(fd);
 995         if (ret < 0)
 996                 goto err;
 997         return fd;
 998 err:
 999         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1000         exit(EXIT_FAILURE);
1001 }
1002
1003 static void signal_pre_select(struct sched *s, void *context)
1004 {
1005         struct signal_task *st = context;
1006         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1007 }
1008
1009 static int signal_post_select(struct sched *s, void *context)
1010 {
1011         struct signal_task *st = context;
1012         int ret, signum;
1013
1014         ret = task_get_notification(st->task);
1015         if (ret < 0)
1016                 return ret;
1017         signum = para_next_signal(&s->rfds);
1018         switch (signum) {
1019         case SIGINT:
1020         case SIGTERM:
1021         case SIGHUP:
1022                 PARA_NOTICE_LOG("received signal %d\n", signum);
1023                 task_notify_all(s, E_AUDIOD_SIGNAL);
1024                 return -E_AUDIOD_SIGNAL;
1025         }
1026         return 0;
1027 }
1028
1029 static void command_pre_select(struct sched *s, void *context)
1030 {
1031         struct command_task *ct = context;
1032         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1033 }
1034
1035 static int command_post_select(struct sched *s, void *context)
1036 {
1037         int ret;
1038         struct command_task *ct = context;
1039         static struct timeval last_status_dump;
1040         struct timeval tmp, delay;
1041         bool force = true;
1042
1043         ret = task_get_notification(ct->task);
1044         if (ret < 0)
1045                 return ret;
1046         ret = handle_connect(ct->fd, &s->rfds);
1047         if (ret < 0) {
1048                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1049                 if (ret == -E_AUDIOD_TERM) {
1050                         task_notify_all(s, -ret);
1051                         return ret;
1052                 }
1053         } else if (ret > 0)
1054                 goto dump;
1055
1056         /* if last status dump was less than 500ms ago, do nothing */
1057         delay.tv_sec = 0;
1058         delay.tv_usec = 500 * 1000;
1059         tv_add(&last_status_dump, &delay, &tmp);
1060         if (tv_diff(now, &tmp, NULL) < 0)
1061                 return 0;
1062
1063         /*
1064          * If last status dump was more than 5s ago, force update. Otherwise,
1065          * update only those items that have changed.
1066          */
1067         delay.tv_sec = 5;
1068         delay.tv_usec = 0;
1069         tv_add(&last_status_dump, &delay, &tmp);
1070         if (tv_diff(now, &tmp, NULL) < 0)
1071                 force = false;
1072 dump:
1073         audiod_status_dump(force);
1074         last_status_dump = *now;
1075         return 1;
1076 }
1077
1078 static void init_command_task(struct command_task *ct)
1079 {
1080         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1081
1082         ct->task = task_register(&(struct task_info) {
1083                 .name = "command",
1084                 .pre_select = command_pre_select,
1085                 .post_select = command_post_select,
1086                 .context = ct,
1087         }, &sched);
1088 }
1089
1090 static void close_stat_pipe(void)
1091 {
1092         if (!stat_task->ct)
1093                 return;
1094         task_reap(&stat_task->ct->task);
1095         client_close(stat_task->ct);
1096         stat_task->ct = NULL;
1097         clear_and_dump_items();
1098         stat_task->length_seconds = 0;
1099         stat_task->offset_seconds = 0;
1100         stat_task->vss_status = 0;
1101         stat_task->current_audio_format_num = -1;
1102         audiod_status_dump(true);
1103 }
1104
1105 /* avoid busy loop if server is down */
1106 static void set_stat_task_restart_barrier(unsigned seconds)
1107 {
1108         struct timeval delay = {seconds, 0};
1109         tv_add(now, &delay, &stat_task->restart_barrier);
1110 }
1111
1112 static bool must_close_slot(int slot_num)
1113 {
1114         struct slot_info *s = &slot[slot_num];
1115         struct audio_format_info *a = afi + s->format;
1116         int i;
1117
1118         if (s->format < 0)
1119                 return false;
1120         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1121                 return false;
1122         for (i = 0; i < a->num_filters; i++)
1123                 if (s->fns && task_status(s->fns[i].task) >= 0)
1124                         return false;
1125         if (a->num_writers > 0) {
1126                 for (i = 0; i < a->num_writers; i++)
1127                         if (s->wns && task_status(s->wns[i].task) >= 0)
1128                                 return false;
1129         } else {
1130                 if (s->wns && task_status(s->wns[0].task) >= 0)
1131                         return false;
1132         }
1133         return true;
1134 }
1135
1136 static void close_slot(int slot_num)
1137 {
1138         struct slot_info *s = slot + slot_num;
1139
1140         PARA_INFO_LOG("closing slot %d\n", slot_num);
1141         close_writers(s);
1142         close_filters(s);
1143         close_receiver(slot_num);
1144         clear_slot(slot_num);
1145 }
1146
1147 static void close_unused_slots(void)
1148 {
1149         int i;
1150
1151         FOR_EACH_SLOT(i)
1152                 if (must_close_slot(i))
1153                         close_slot(i);
1154 }
1155
1156 /*
1157  * Cleanup all resources.
1158  *
1159  * This performs various cleanups, removes the audiod socket and closes the
1160  * connection to para_server.
1161  */
1162 static void audiod_cleanup(void)
1163 {
1164         if (socket_name)
1165                 unlink(socket_name);
1166         close_stat_pipe();
1167         close_unused_slots();
1168         audiod_cmdline_parser_free(&conf);
1169         close_stat_clients();
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
1181         close_unused_slots();
1182         if (audiod_status != AUDIOD_ON ||
1183                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1184                 return notify_receivers(E_NOT_PLAYING);
1185         if (!must_start_decoder())
1186                 return;
1187         ret = open_receiver(stat_task->current_audio_format_num);
1188         if (ret < 0) {
1189                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1190                 return;
1191         }
1192         sl = slot + ret;
1193         open_filters(sl);
1194         open_writers(sl);
1195         activate_grab_clients(&sched);
1196         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1197 }
1198
1199 static void status_pre_select(struct sched *s, void *context)
1200 {
1201         struct status_task *st = context;
1202         int i, ret, cafn = stat_task->current_audio_format_num;
1203
1204         if (must_start_decoder())
1205                 goto min_delay;
1206         FOR_EACH_SLOT(i)
1207                 if (must_close_slot(i))
1208                         goto min_delay;
1209         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1210         if (ret > 0)
1211                 goto min_delay;
1212         if (st->ct && audiod_status == AUDIOD_OFF)
1213                 goto min_delay;
1214         if (!st->ct && audiod_status != AUDIOD_OFF)
1215                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1216         if (cafn >= 0)
1217                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1218         /*
1219          * If para_server is playing we'd like to have a smooth time display
1220          * even if we are running in standby mode. So we request a timeout that
1221          * expires at the next full second.
1222          */
1223         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1224                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1225         return;
1226 min_delay:
1227         sched_min_delay(s);
1228 }
1229
1230 /* restart the client task if necessary */
1231 static int status_post_select(struct sched *s, void *context)
1232 {
1233         struct status_task *st = context;
1234         int ret;
1235
1236         ret = task_get_notification(st->task);
1237         if (ret < 0)
1238                 return ret;
1239         if (audiod_status == AUDIOD_OFF) {
1240                 if (!st->ct)
1241                         goto out;
1242                 if (task_status(st->ct->task) >= 0) {
1243                         task_notify(st->ct->task, E_AUDIOD_OFF);
1244                         goto out;
1245                 }
1246                 close_stat_pipe();
1247                 st->clock_diff_count = conf.clock_diff_count_arg;
1248                 goto out;
1249         }
1250         if (st->ct) {
1251                 char *buf;
1252                 size_t sz;
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->sa_time_diff_sign = 1;
1315         st->clock_diff_count = conf.clock_diff_count_arg;
1316         st->current_audio_format_num = -1;
1317         st->btrn = btr_new_node(&(struct btr_node_description)
1318                 EMBRACE(.name = "stat"));
1319
1320         stat_task->task = task_register(&(struct task_info) {
1321                 .name = "stat",
1322                 .pre_select = status_pre_select,
1323                 .post_select = status_post_select,
1324                 .context = stat_task,
1325         }, &sched);
1326 }
1327
1328 static void set_initial_status(void)
1329 {
1330         audiod_status = AUDIOD_ON;
1331         if (!conf.mode_given)
1332                 return;
1333         if (!strcmp(conf.mode_arg, "sb")) {
1334                 audiod_status = AUDIOD_STANDBY;
1335                 return;
1336         }
1337         if (!strcmp(conf.mode_arg, "off")) {
1338                 audiod_status = AUDIOD_OFF;
1339                 return;
1340         }
1341         if (strcmp(conf.mode_arg, "on"))
1342                 PARA_WARNING_LOG("invalid mode\n");
1343 }
1344
1345 __noreturn static void print_help_and_die(void)
1346 {
1347         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1348         bool d = conf.detailed_help_given;
1349         unsigned flags;
1350
1351         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1352         ggo_print_help(&h, flags);
1353
1354         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1355         print_receiver_helps(flags);
1356         print_filter_helps(flags);
1357         print_writer_helps(flags);
1358         exit(0);
1359 }
1360
1361 static void init_colors_or_die(void)
1362 {
1363         int i;
1364
1365         if (!want_colors())
1366                 return;
1367         daemon_set_default_log_colors();
1368         daemon_set_flag(DF_COLOR_LOG);
1369         for (i = 0; i < conf.log_color_given; i++)
1370                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1371 }
1372
1373 /**
1374  * the main function of para_audiod
1375  *
1376  * \param argc usual argument count
1377  * \param argv usual argument vector
1378  *
1379  * \return EXIT_SUCCESS or EXIT_FAILURE
1380  *
1381  * \sa para_audiod(1)
1382  * */
1383 int main(int argc, char *argv[])
1384 {
1385         int ret, i;
1386         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1387         struct audiod_cmdline_parser_params params = {
1388                 .override = 0,
1389                 .initialize = 1,
1390                 .check_required = 0,
1391                 .check_ambiguity = 0,
1392                 .print_errors = 1
1393         };
1394
1395         valid_fd_012();
1396         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1397         daemon_set_loglevel(conf.loglevel_arg);
1398         version_handle_flag("audiod", conf.version_given);
1399         /* init receivers/filters/writers early to make help work */
1400         recv_init();
1401         filter_init();
1402         writer_init();
1403         if (conf.help_given || conf.detailed_help_given)
1404                 print_help_and_die();
1405         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1406         parse_config_or_die();
1407         init_colors_or_die();
1408         init_random_seed_or_die();
1409         daemon_set_flag(DF_LOG_TIME);
1410         daemon_set_flag(DF_LOG_HOSTNAME);
1411         daemon_set_flag(DF_LOG_LL);
1412         if (conf.log_timing_given)
1413                 daemon_set_flag(DF_LOG_TIMING);
1414         if (conf.logfile_given) {
1415                 daemon_set_logfile(conf.logfile_arg);
1416                 daemon_open_log_or_die();
1417         }
1418         ret = parse_stream_args();
1419         if (ret < 0) {
1420                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1421                 exit(EXIT_FAILURE);
1422         }
1423         daemon_log_welcome("para_audiod");
1424         daemon_set_start_time();
1425         set_initial_status();
1426         FOR_EACH_SLOT(i)
1427                 clear_slot(i);
1428         setup_signal_handling();
1429
1430         init_status_task(stat_task);
1431         init_command_task(cmd_task);
1432
1433         if (conf.daemon_given)
1434                 daemonize(false /* parent exits immediately */);
1435
1436         sig_task->task = task_register(&(struct task_info) {
1437                 .name = "signal",
1438                 .pre_select = signal_pre_select,
1439                 .post_select = signal_post_select,
1440                 .context = sig_task,
1441         }, &sched);
1442
1443         sched.default_timeout.tv_sec = 2;
1444         sched.default_timeout.tv_usec = 999 * 1000;
1445         ret = schedule(&sched);
1446         audiod_cleanup();
1447         sched_shutdown(&sched);
1448
1449         if (ret < 0)
1450                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1451         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1452 }