audiod.c

   1 /*
   2  * Copyright (C) 2005-2014 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 take into account that the stream was probably 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         task_reap(&s->receiver_node->task);
 395         free(s->receiver_node);
 396         s->receiver_node = NULL;
 397         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 398                 &a->restart_barrier);
 399 }
 400
 401 static void writer_cleanup(struct writer_node *wn)
 402 {
 403         struct writer *w;
 404
 405         if (!wn)
 406                 return;
 407         w = writers + wn->writer_num;
 408         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 409         w->close(wn);
 410         btr_remove_node(&wn->btrn);
 411         task_reap(&wn->task);
 412 }
 413
 414 static void close_writers(struct slot_info *s)
 415 {
 416         struct audio_format_info *a;
 417         int i;
 418
 419         if (s->format < 0)
 420                 return;
 421         assert(s->wns);
 422         a = afi + s->format;
 423         if (a->num_writers == 0)
 424                 writer_cleanup(s->wns);
 425         else {
 426                 for (i = 0; i < a->num_writers; i++)
 427                         writer_cleanup(s->wns + i);
 428         }
 429         free(s->wns);
 430         s->wns = NULL;
 431 }
 432
 433 static void close_filters(struct slot_info *s)
 434 {
 435         int i;
 436         struct audio_format_info *a = afi + s->format;
 437         if (a->num_filters == 0)
 438                 return;
 439         for (i = a->num_filters - 1; i >= 0; i--) {
 440                 struct filter_node *fn = s->fns + i;
 441                 struct filter *f;
 442
 443                 if (!fn)
 444                         continue;
 445                 f = filters + fn->filter_num;
 446                 if (f->close)
 447                         f->close(fn);
 448                 btr_remove_node(&fn->btrn);
 449                 task_reap(&fn->task);
 450         }
 451         free(s->fns);
 452         s->fns = NULL;
 453 }
 454
 455 static void notify_receivers(int error)
 456 {
 457         int i;
 458
 459         FOR_EACH_SLOT(i) {
 460                 struct slot_info *s = slot + i;
 461                 if (s->format < 0)
 462                         continue;
 463                 if (!s->receiver_node)
 464                         continue;
 465                 task_notify(s->receiver_node->task, error);
 466         }
 467 }
 468
 469 static int get_empty_slot(void)
 470 {
 471         int i;
 472         struct slot_info *s;
 473
 474         FOR_EACH_SLOT(i) {
 475                 s = &slot[i];
 476                 if (s->format < 0) {
 477                         clear_slot(i);
 478                         return i;
 479                 }
 480                 if (s->wns || s->receiver_node || s->fns)
 481                         continue;
 482                 clear_slot(i);
 483                 return i;
 484         }
 485         return -E_NO_MORE_SLOTS;
 486 }
 487
 488 static void open_filters(struct slot_info *s)
 489 {
 490         struct audio_format_info *a = afi + s->format;
 491         struct filter_node *fn;
 492         int nf = a->num_filters;
 493         struct btr_node *parent;
 494         int i;
 495
 496         if (nf == 0)
 497                 return;
 498         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 499         assert(s->fns == NULL);
 500         s->fns = para_calloc(nf * sizeof(struct filter_node));
 501         parent = s->receiver_node->btrn;
 502         for (i = 0; i < nf; i++) {
 503                 char buf[20];
 504                 struct filter *f = filters + a->filter_nums[i];
 505                 fn = s->fns + i;
 506                 fn->filter_num = a->filter_nums[i];
 507                 fn->conf = a->filter_conf[i];
 508                 fn->btrn = btr_new_node(&(struct btr_node_description)
 509                         EMBRACE(.name = f->name, .parent = parent,
 510                                 .handler = f->execute, .context = fn));
 511
 512                 f->open(fn);
 513                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 514                 fn->task = task_register(&(struct task_info) {
 515                         .name = buf,
 516                         .pre_select = f->pre_select,
 517                         .post_select = f->post_select,
 518                         .context = fn,
 519                 }, &sched);
 520                 parent = fn->btrn;
 521                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 522                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 523         }
 524 }
 525
 526 static void open_writers(struct slot_info *s)
 527 {
 528         int i;
 529         struct audio_format_info *a = afi + s->format;
 530         struct writer_node *wn;
 531         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 532
 533         assert(s->wns == NULL);
 534         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 535                 * sizeof(struct writer_node));
 536         for (i = 0; i < a->num_writers; i++) {
 537                 wn = s->wns + i;
 538                 wn->conf = a->writer_conf[i];
 539                 wn->writer_num = a->writer_nums[i];
 540                 register_writer_node(wn, parent, &sched);
 541                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 542                         writer_names[a->writer_nums[i]], (int)(s - slot));
 543         }
 544 }
 545
 546 /* returns slot num on success */
 547 static int open_receiver(int format)
 548 {
 549         struct audio_format_info *a = &afi[format];
 550         struct slot_info *s;
 551         int ret, slot_num;
 552         struct receiver *r = a->receiver;
 553         struct receiver_node *rn;
 554
 555         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 556         ret = get_empty_slot();
 557         if (ret < 0)
 558                 return ret;
 559         slot_num = ret;
 560         rn = para_calloc(sizeof(*rn));
 561         rn->receiver = r;
 562         rn->conf = a->receiver_conf;
 563         rn->btrn = btr_new_node(&(struct btr_node_description)
 564                 EMBRACE(.name = r->name, .context = rn));
 565         ret = r->open(rn);
 566         if (ret < 0) {
 567                 btr_remove_node(&rn->btrn);
 568                 free(rn);
 569                 return ret;
 570         }
 571         s = &slot[slot_num];
 572         s->format = format;
 573         s->receiver_node = rn;
 574         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 575                 audio_formats[format], r->name, slot_num);
 576         rn->task = task_register(&(struct task_info) {
 577                 .name = r->name,
 578                 .pre_select = r->pre_select,
 579                 .post_select = r->post_select,
 580                 .context = rn,
 581         }, &sched);
 582         return slot_num;
 583 }
 584
 585 static bool receiver_running(void)
 586 {
 587         int i;
 588         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 589
 590         FOR_EACH_SLOT(i) {
 591                 struct slot_info *s = &slot[i];
 592                 long unsigned ss2 = s->server_stream_start.tv_sec;
 593
 594                 if (!s->receiver_node)
 595                         continue;
 596                 if (s->receiver_node->task->error >= 0)
 597                         return true;
 598                 if (ss1 == ss2)
 599                         return true;
 600         }
 601         return false;
 602 }
 603
 604 /**
 605  * Return the root node of the current buffer tree.
 606  *
 607  * This is only used for stream grabbing.
 608  *
 609  * \return \p NULL if no slot is currently active. If more than one buffer tree
 610  * exists, the node corresponding to the most recently started receiver is
 611  * returned.
 612  */
 613 struct btr_node *audiod_get_btr_root(void)
 614 {
 615         int i, newest_slot = -1;
 616         struct timeval newest_rstime = {0, 0};
 617
 618         FOR_EACH_SLOT(i) {
 619                 struct slot_info *s = &slot[i];
 620                 struct timeval rstime;
 621                 if (!s->receiver_node)
 622                         continue;
 623                 if (s->receiver_node->task->error < 0)
 624                         continue;
 625                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 626                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 627                         continue;
 628                 newest_rstime = rstime;
 629                 newest_slot = i;
 630         }
 631         if (newest_slot == -1)
 632                 return NULL;
 633         return slot[newest_slot].receiver_node->btrn;
 634 }
 635
 636 /* whether a new instance of a decoder should be started. */
 637 static bool must_start_decoder(void)
 638 {
 639         int cafn = stat_task->current_audio_format_num;
 640         unsigned vs = stat_task->vss_status;
 641
 642         if (audiod_status != AUDIOD_ON)
 643                 return false;
 644         if (cafn < 0)
 645                 return false;
 646         if (!stat_task->ct)
 647                 return false;
 648         if (vs & VSS_STATUS_FLAG_NEXT)
 649                 return false;
 650         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 651                 return false;
 652         if (receiver_running())
 653                 return false;
 654         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 655                 return false;
 656         return true;
 657 }
 658
 659 static void compute_time_diff(const struct timeval *status_time)
 660 {
 661         struct timeval tmp, diff;
 662         static unsigned count;
 663         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 664         const struct timeval max_deviation = {0, 500 * 1000};
 665         const int time_smooth = 5;
 666
 667         sign = tv_diff(status_time, now, &diff);
 668 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 669 //                      sign, sa_time_diff_sign);
 670         if (!count) {
 671                 sa_time_diff_sign = sign;
 672                 stat_task->sa_time_diff = diff;
 673                 count++;
 674                 goto out;
 675         }
 676         if (count > 5) {
 677                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 678                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 679                         PARA_WARNING_LOG("time diff jump: %lims\n",
 680                                 s * tv2ms(&tmp));
 681         }
 682         count++;
 683         sa_time_diff_sign = tv_convex_combination(
 684                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 685                 count > 10? sign : sign * time_smooth, &diff,
 686                 &tmp);
 687         stat_task->sa_time_diff = tmp;
 688         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 689                 sign < 0? "-" : "+",
 690                 tv2ms(&diff),
 691                 sa_time_diff_sign < 0? "-" : "+",
 692                 tv2ms(&stat_task->sa_time_diff)
 693         );
 694 out:
 695         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 696 }
 697
 698 static int update_item(int itemnum, char *buf)
 699 {
 700         long unsigned sec, usec;
 701
 702         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 703                 return 1;
 704         free(stat_item_values[itemnum]);
 705         stat_item_values[itemnum] = para_strdup(buf);
 706         stat_client_write_item(itemnum);
 707         switch (itemnum) {
 708         case SI_STATUS_FLAGS:
 709                 stat_task->vss_status = 0;
 710                 if (strchr(buf, 'N'))
 711                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 712                 if (strchr(buf, 'P'))
 713                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 714                 break;
 715         case SI_OFFSET:
 716                 stat_task->offset_seconds = atoi(buf);
 717                 break;
 718         case SI_SECONDS_TOTAL:
 719                 stat_task->length_seconds = atoi(buf);
 720                 break;
 721         case SI_STREAM_START:
 722                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 723                         stat_task->server_stream_start.tv_sec = sec;
 724                         stat_task->server_stream_start.tv_usec = usec;
 725                 }
 726                 break;
 727         case SI_CURRENT_TIME:
 728                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 729                         struct timeval tv = {sec, usec};
 730                         compute_time_diff(&tv);
 731                 }
 732                 break;
 733         case SI_FORMAT:
 734                 stat_task->current_audio_format_num
 735                         = get_audio_format_num(buf);
 736         }
 737         return 1;
 738 }
 739
 740 static int parse_stream_command(const char *txt, char **cmd)
 741 {
 742         int ret, len;
 743         char *re, *p = strchr(txt, ':');
 744
 745         if (!p)
 746                 return -E_MISSING_COLON;
 747         *cmd = p + 1;
 748         len = p - txt;
 749         re = malloc(len + 1);
 750         strncpy(re, txt, len);
 751         re[len] = '\0';
 752         ret = get_matching_audio_format_nums(re);
 753         free(re);
 754         return ret;
 755 }
 756
 757 static int add_filter(int format, char *cmdline)
 758 {
 759         struct audio_format_info *a = &afi[format];
 760         int filter_num, nf = a->num_filters;
 761         void *cfg;
 762
 763         filter_num = check_filter_arg(cmdline, &cfg);
 764         if (filter_num < 0)
 765                 return filter_num;
 766         a->filter_conf = para_realloc(a->filter_conf,
 767                 (nf + 1) * sizeof(void *));
 768         a->filter_nums = para_realloc(a->filter_nums,
 769                 (nf + 1) * sizeof(unsigned));
 770         a->filter_nums[nf] = filter_num;
 771         a->filter_conf[nf] = cfg;
 772         a->num_filters++;
 773         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 774                 filters[filter_num].name);
 775         return filter_num;
 776 }
 777
 778 static int parse_writer_args(void)
 779 {
 780         int i, ret;
 781         char *cmd;
 782         struct audio_format_info *a;
 783
 784         for (i = 0; i < conf.writer_given; i++) {
 785                 void *wconf;
 786                 int j, nw, writer_num, af_mask;
 787
 788                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 789                 if (ret < 0)
 790                         return ret;
 791                 af_mask = ret;
 792                 FOR_EACH_AUDIO_FORMAT(j) {
 793                         a = afi + j;
 794                         if ((af_mask & (1 << j)) == 0) /* no match */
 795                                 continue;
 796                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 797                         nw = a->num_writers;
 798                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 799                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 800                         a->writer_nums[nw] = writer_num;
 801                         a->writer_conf[nw] = wconf;
 802                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 803                                 nw, writer_names[writer_num]);
 804                         a->num_writers++;
 805                 }
 806         }
 807         /* Use default writer for audio formats which are not yet set up. */
 808         FOR_EACH_AUDIO_FORMAT(i) {
 809                 void *writer_conf;
 810                 int writer_num;
 811                 a = afi + i;
 812                 if (a->num_writers > 0)
 813                         continue; /* already set up */
 814                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 815                 a->writer_nums = para_malloc(sizeof(int));
 816                 a->writer_nums[0] = writer_num;
 817                 a->writer_conf = para_malloc(sizeof(void *));
 818                 a->writer_conf[0] = writer_conf;
 819                 a->num_writers = 1;
 820                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 821                         writer_names[writer_num]);
 822         }
 823         return 1;
 824 }
 825
 826 static int parse_receiver_args(void)
 827 {
 828         int i, ret, receiver_num;
 829         char *cmd = NULL;
 830         struct audio_format_info *a;
 831
 832         for (i = conf.receiver_given - 1; i >= 0; i--) {
 833                 char *arg;
 834                 int j, af_mask;
 835
 836                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 837                 if (ret < 0)
 838                         goto out;
 839                 af_mask = ret;
 840                 FOR_EACH_AUDIO_FORMAT(j) {
 841                         a = afi + j;
 842                         if ((af_mask & (1 << j)) == 0) /* no match */
 843                                 continue;
 844                         /*
 845                          * If multiple receivers are given for this audio format, the
 846                          * last one wins and we have to free the previous receiver
 847                          * config here. Since we are iterating backwards, the winning
 848                          * receiver arg is in fact the first one given.
 849                          */
 850                         if (a->receiver_conf)
 851                                 a->receiver->free_config(a->receiver_conf);
 852                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 853                         ret = -E_RECV_SYNTAX;
 854                         if (!a->receiver_conf)
 855                                 goto out;
 856                         a->receiver = receivers + receiver_num;
 857                 }
 858         }
 859         /*
 860          * Use the first available receiver with no arguments for those audio
 861          * formats for which no receiver was specified.
 862          */
 863         cmd = para_strdup(receivers[0].name);
 864         FOR_EACH_AUDIO_FORMAT(i) {
 865                 a = &afi[i];
 866                 if (a->receiver_conf)
 867                         continue;
 868                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 869                 if (!a->receiver_conf)
 870                         return -E_RECV_SYNTAX;
 871                 a->receiver = &receivers[receiver_num];
 872         }
 873         FOR_EACH_AUDIO_FORMAT(i) {
 874                 a = afi + i;
 875                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 876                         audio_formats[i], a->receiver->name);
 877         }
 878         ret = 1;
 879 out:
 880         free(cmd);
 881         return ret;
 882 }
 883
 884 static int init_default_filters(void)
 885 {
 886         int i, ret = 1;
 887
 888         FOR_EACH_AUDIO_FORMAT(i) {
 889                 struct audio_format_info *a = &afi[i];
 890                 char *tmp;
 891                 int j;
 892
 893                 if (a->num_filters)
 894                         continue; /* no default -- nothing to to */
 895                 /*
 896                  * udp and dccp streams are fec-encoded, so add fecdec as the
 897                  * first filter.
 898                  */
 899                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 900                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 901                         tmp = para_strdup("fecdec");
 902                         add_filter(i, tmp);
 903                         free(tmp);
 904                         if (ret < 0)
 905                                 goto out;
 906                 }
 907                 /* add "dec" to audio format name */
 908                 tmp = make_message("%sdec", audio_formats[i]);
 909                 for (j = 0; filters[j].name; j++)
 910                         if (!strcmp(tmp, filters[j].name))
 911                                 break;
 912                 free(tmp);
 913                 ret = -E_UNSUPPORTED_FILTER;
 914                 if (!filters[j].name)
 915                         goto out;
 916                 tmp = para_strdup(filters[j].name);
 917                 ret = add_filter(i, tmp);
 918                 free(tmp);
 919                 if (ret < 0)
 920                         goto out;
 921                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 922                         filters[j].name);
 923         }
 924 out:
 925         return ret;
 926 }
 927
 928 static int parse_filter_args(void)
 929 {
 930         int i, j, ret, af_mask, num_matches;
 931
 932         for (i = 0; i < conf.filter_given; i++) {
 933                 char *arg;
 934                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 935                 if (ret < 0)
 936                         goto out;
 937                 af_mask = ret;
 938                 num_matches = 0;
 939                 FOR_EACH_AUDIO_FORMAT(j) {
 940                         if ((af_mask & (1 << j)) == 0) /* no match */
 941                                 continue;
 942                         ret = add_filter(j, arg);
 943                         if (ret < 0)
 944                                 goto out;
 945                         num_matches++;
 946                 }
 947                 if (num_matches == 0)
 948                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 949                                 conf.filter_arg[i]);
 950         }
 951         ret = init_default_filters(); /* use default values for the rest */
 952 out:
 953         return ret;
 954 }
 955
 956 static int parse_stream_args(void)
 957 {
 958         int ret;
 959
 960         ret = parse_receiver_args();
 961         if (ret < 0)
 962                 return ret;
 963         ret = parse_filter_args();
 964         if (ret < 0)
 965                 return ret;
 966         ret = parse_writer_args();
 967         if (ret < 0)
 968                 return ret;
 969         return 1;
 970 }
 971
 972 /* does not unlink socket on errors */
 973 static int audiod_get_socket(void)
 974 {
 975         struct sockaddr_un unix_addr;
 976         int ret, fd;
 977
 978         if (conf.socket_given)
 979                 socket_name = para_strdup(conf.socket_arg);
 980         else {
 981                 char *hn = para_hostname();
 982                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 983                         hn);
 984                 free(hn);
 985         }
 986         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 987         if (conf.force_given)
 988                 unlink(socket_name);
 989         ret = create_local_socket(socket_name, &unix_addr,
 990                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 991         if (ret < 0)
 992                 goto err;
 993         fd = ret;
 994         if (listen(fd , 5) < 0) {
 995                 ret = -ERRNO_TO_PARA_ERROR(errno);
 996                 goto err;
 997         }
 998         ret = mark_fd_nonblocking(fd);
 999         if (ret < 0)
1000                 goto err;
1001         return fd;
1002 err:
1003         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1004         exit(EXIT_FAILURE);
1005 }
1006
1007 static void signal_pre_select(struct sched *s, struct task *t)
1008 {
1009         struct signal_task *st = task_context(t);
1010         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1011 }
1012
1013 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1014 {
1015         int signum;
1016
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                 clean_exit(EXIT_FAILURE, "caught deadly signal");
1024         }
1025         return 0;
1026 }
1027
1028 static void command_pre_select(struct sched *s, struct task *t)
1029 {
1030         struct command_task *ct = task_context(t);
1031         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1032 }
1033
1034 static int command_post_select(struct sched *s, struct task *t)
1035 {
1036         int ret;
1037         struct command_task *ct = task_context(t);
1038         static struct timeval last_status_dump;
1039         struct timeval tmp, delay;
1040         bool force = true;
1041
1042         ret = handle_connect(ct->fd, &s->rfds);
1043         if (ret < 0)
1044                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1045         else if (ret > 0)
1046                 goto dump;
1047
1048         /* if last status dump was less than 500ms ago, do nothing */
1049         delay.tv_sec = 0;
1050         delay.tv_usec = 500 * 1000;
1051         tv_add(&last_status_dump, &delay, &tmp);
1052         if (tv_diff(now, &tmp, NULL) < 0)
1053                 return 0;
1054
1055         /*
1056          * If last status dump was more than 5s ago, force update. Otherwise,
1057          * update only those items that have changed.
1058          */
1059         delay.tv_sec = 5;
1060         delay.tv_usec = 0;
1061         tv_add(&last_status_dump, &delay, &tmp);
1062         if (tv_diff(now, &tmp, NULL) < 0)
1063                 force = false;
1064 dump:
1065         audiod_status_dump(force);
1066         last_status_dump = *now;
1067         return 1;
1068 }
1069
1070 static void init_command_task(struct command_task *ct)
1071 {
1072         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1073
1074         ct->task = task_register(&(struct task_info) {
1075                 .name = "command",
1076                 .pre_select = command_pre_select,
1077                 .post_select = command_post_select,
1078                 .context = ct,
1079         }, &sched);
1080 }
1081
1082 static void close_stat_pipe(void)
1083 {
1084         if (!stat_task->ct)
1085                 return;
1086         client_close(stat_task->ct);
1087         task_reap(&stat_task->ct->task);
1088         stat_task->ct = NULL;
1089         clear_and_dump_items();
1090         stat_task->length_seconds = 0;
1091         stat_task->offset_seconds = 0;
1092         stat_task->vss_status = 0;
1093         stat_task->current_audio_format_num = -1;
1094         audiod_status_dump(true);
1095 }
1096
1097 /* avoid busy loop if server is down */
1098 static void set_stat_task_restart_barrier(unsigned seconds)
1099 {
1100         struct timeval delay = {seconds, 0};
1101         tv_add(now, &delay, &stat_task->restart_barrier);
1102 }
1103
1104 static bool must_close_slot(int slot_num)
1105 {
1106         struct slot_info *s = &slot[slot_num];
1107         struct audio_format_info *a = afi + s->format;
1108         int i;
1109
1110         if (s->format < 0)
1111                 return false;
1112         if (s->receiver_node && s->receiver_node->task->error >= 0)
1113                 return false;
1114         for (i = 0; i < a->num_filters; i++)
1115                 if (s->fns && s->fns[i].task->error >= 0)
1116                         return false;
1117         if (a->num_writers > 0) {
1118                 for (i = 0; i < a->num_writers; i++)
1119                         if (s->wns && s->wns[i].task->error >= 0)
1120                                 return false;
1121         } else {
1122                 if (s->wns && s->wns[0].task->error >= 0)
1123                         return false;
1124         }
1125         return true;
1126 }
1127
1128 static void close_slot(int slot_num)
1129 {
1130         struct slot_info *s = slot + slot_num;
1131
1132         PARA_INFO_LOG("closing slot %d\n", slot_num);
1133         close_writers(s);
1134         close_filters(s);
1135         close_receiver(slot_num);
1136         clear_slot(slot_num);
1137 }
1138
1139 static void close_unused_slots(void)
1140 {
1141         int i;
1142
1143         FOR_EACH_SLOT(i)
1144                 if (must_close_slot(i))
1145                         close_slot(i);
1146 }
1147
1148 /**
1149  * Close the connection to para_server and exit.
1150  *
1151  * \param status The exit status which is passed to exit(3).
1152  * \param msg The log message
1153  *
1154  * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1155  * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1156  * or EXIT_FAILURE.
1157  *
1158  * \sa exit(3).
1159  */
1160 void __noreturn clean_exit(int status, const char *msg)
1161 {
1162         if (socket_name)
1163                 unlink(socket_name);
1164         close_stat_pipe();
1165         close_unused_slots();
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
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, struct task *t)
1200 {
1201         struct status_task *st = task_context(t);
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, struct task *t)
1232 {
1233         struct status_task *st = task_context(t);
1234
1235         if (audiod_status == AUDIOD_OFF) {
1236                 if (!st->ct)
1237                         goto out;
1238                 if (st->ct->task->error >= 0) {
1239                         task_notify(st->ct->task, E_AUDIOD_OFF);
1240                         goto out;
1241                 }
1242                 close_stat_pipe();
1243                 st->clock_diff_count = conf.clock_diff_count_arg;
1244                 goto out;
1245         }
1246         if (st->ct) {
1247                 char *buf;
1248                 size_t sz;
1249                 int ret;
1250
1251                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1252                 if (ret < 0) {
1253                         close_stat_pipe();
1254                         goto out;
1255                 }
1256                 if (st->ct->status != CL_EXECUTING)
1257                         goto out;
1258                 if (ret == 0) {
1259                         struct timeval diff;
1260                         tv_diff(now, &st->last_status_read, &diff);
1261                         if (diff.tv_sec > 61)
1262                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1263                         goto out;
1264                 }
1265                 btr_merge(st->btrn, st->min_iqs);
1266                 sz = btr_next_buffer(st->btrn, &buf);
1267                 ret = for_each_stat_item(buf, sz, update_item);
1268                 if (ret < 0) {
1269                         task_notify(st->ct->task, -ret);
1270                         goto out;
1271                 }
1272                 if (sz != ret) {
1273                         btr_consume(st->btrn, sz - ret);
1274                         st->last_status_read = *now;
1275                         st->min_iqs = 0;
1276                 } else /* current status item crosses buffers */
1277                         st->min_iqs = sz + 1;
1278                 goto out;
1279         }
1280         btr_drain(st->btrn);
1281         st->current_audio_format_num = -1;
1282         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1283                 goto out;
1284         if (st->clock_diff_count) { /* get status only one time */
1285                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1286                 int argc = 5;
1287                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1288                 st->clock_diff_count--;
1289                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1290                 set_stat_task_restart_barrier(2);
1291
1292         } else {
1293                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1294                 int argc = 4;
1295                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1296                 set_stat_task_restart_barrier(5);
1297         }
1298         free(stat_item_values[SI_BASENAME]);
1299         stat_item_values[SI_BASENAME] = para_strdup(
1300                 "no connection to para_server");
1301         stat_client_write_item(SI_BASENAME);
1302         st->last_status_read = *now;
1303 out:
1304         start_stop_decoders();
1305         return 0;
1306 }
1307
1308 static void init_status_task(struct status_task *st)
1309 {
1310         memset(st, 0, sizeof(struct status_task));
1311         st->sa_time_diff_sign = 1;
1312         st->clock_diff_count = conf.clock_diff_count_arg;
1313         st->current_audio_format_num = -1;
1314         st->btrn = btr_new_node(&(struct btr_node_description)
1315                 EMBRACE(.name = "stat"));
1316
1317         stat_task->task = task_register(&(struct task_info) {
1318                 .name = "stat",
1319                 .pre_select = status_pre_select,
1320                 .post_select = status_post_select,
1321                 .context = stat_task,
1322         }, &sched);
1323 }
1324
1325 static void set_initial_status(void)
1326 {
1327         audiod_status = AUDIOD_ON;
1328         if (!conf.mode_given)
1329                 return;
1330         if (!strcmp(conf.mode_arg, "sb")) {
1331                 audiod_status = AUDIOD_STANDBY;
1332                 return;
1333         }
1334         if (!strcmp(conf.mode_arg, "off")) {
1335                 audiod_status = AUDIOD_OFF;
1336                 return;
1337         }
1338         if (strcmp(conf.mode_arg, "on"))
1339                 PARA_WARNING_LOG("invalid mode\n");
1340 }
1341
1342 __noreturn static void print_help_and_die(void)
1343 {
1344         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1345         bool d = conf.detailed_help_given;
1346         unsigned flags;
1347
1348         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1349         ggo_print_help(&h, flags);
1350
1351         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1352         print_receiver_helps(flags);
1353         print_filter_helps(flags);
1354         print_writer_helps(flags);
1355         exit(0);
1356 }
1357
1358 static void init_colors_or_die(void)
1359 {
1360         int i;
1361
1362         if (!want_colors())
1363                 return;
1364         daemon_set_default_log_colors();
1365         daemon_set_flag(DF_COLOR_LOG);
1366         for (i = 0; i < conf.log_color_given; i++)
1367                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1368 }
1369
1370 /**
1371  * the main function of para_audiod
1372  *
1373  * \param argc usual argument count
1374  * \param argv usual argument vector
1375  *
1376  * \return EXIT_SUCCESS or EXIT_FAILURE
1377  *
1378  * \sa para_audiod(1)
1379  * */
1380 int main(int argc, char *argv[])
1381 {
1382         int ret, i;
1383         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1384         struct audiod_cmdline_parser_params params = {
1385                 .override = 0,
1386                 .initialize = 1,
1387                 .check_required = 0,
1388                 .check_ambiguity = 0,
1389                 .print_errors = 1
1390         };
1391
1392         valid_fd_012();
1393         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1394         daemon_set_loglevel(conf.loglevel_arg);
1395         version_handle_flag("audiod", conf.version_given);
1396         /* init receivers/filters/writers early to make help work */
1397         recv_init();
1398         filter_init();
1399         writer_init();
1400         if (conf.help_given || conf.detailed_help_given)
1401                 print_help_and_die();
1402         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1403         parse_config_or_die();
1404         init_colors_or_die();
1405         init_random_seed_or_die();
1406         daemon_set_flag(DF_LOG_TIME);
1407         daemon_set_flag(DF_LOG_HOSTNAME);
1408         daemon_set_flag(DF_LOG_LL);
1409         if (conf.log_timing_given)
1410                 daemon_set_flag(DF_LOG_TIMING);
1411         if (conf.logfile_given) {
1412                 daemon_set_logfile(conf.logfile_arg);
1413                 daemon_open_log_or_die();
1414         }
1415         ret = parse_stream_args();
1416         if (ret < 0) {
1417                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1418                 exit(EXIT_FAILURE);
1419         }
1420         log_welcome("para_audiod");
1421         set_server_start_time(NULL);
1422         set_initial_status();
1423         FOR_EACH_SLOT(i)
1424                 clear_slot(i);
1425         setup_signal_handling();
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         sig_task->task = task_register(&(struct task_info) {
1434                 .name = "signal",
1435                 .pre_select = signal_pre_select,
1436                 .post_select = signal_post_select,
1437                 .context = sig_task,
1438         }, &sched);
1439
1440         sched.default_timeout.tv_sec = 2;
1441         sched.default_timeout.tv_usec = 999 * 1000;
1442         ret = schedule(&sched);
1443         sched_shutdown(&sched);
1444
1445         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1446         return EXIT_FAILURE;
1447 }