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         stat_task->current_audio_format_num = -1;
 394         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 395                 &a->restart_barrier);
 396 }
 397
 398 static void writer_cleanup(struct writer_node *wn)
 399 {
 400         struct writer *w;
 401
 402         if (!wn)
 403                 return;
 404         w = writers + wn->writer_num;
 405         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 406         w->close(wn);
 407         btr_remove_node(&wn->btrn);
 408         task_reap(&wn->task);
 409 }
 410
 411 static void close_writers(struct slot_info *s)
 412 {
 413         struct audio_format_info *a;
 414         int i;
 415
 416         if (s->format < 0)
 417                 return;
 418         assert(s->wns);
 419         a = afi + s->format;
 420         if (a->num_writers == 0)
 421                 writer_cleanup(s->wns);
 422         else {
 423                 for (i = 0; i < a->num_writers; i++)
 424                         writer_cleanup(s->wns + i);
 425         }
 426         free(s->wns);
 427         s->wns = NULL;
 428 }
 429
 430 static void close_filters(struct slot_info *s)
 431 {
 432         int i;
 433         struct audio_format_info *a = afi + s->format;
 434         if (a->num_filters == 0)
 435                 return;
 436         for (i = a->num_filters - 1; i >= 0; i--) {
 437                 struct filter_node *fn = s->fns + i;
 438                 struct filter *f;
 439
 440                 if (!fn)
 441                         continue;
 442                 f = filters + fn->filter_num;
 443                 if (f->close)
 444                         f->close(fn);
 445                 btr_remove_node(&fn->btrn);
 446                 task_reap(&fn->task);
 447         }
 448         free(s->fns);
 449         s->fns = NULL;
 450 }
 451
 452 static void notify_receivers(int error)
 453 {
 454         int i;
 455
 456         FOR_EACH_SLOT(i) {
 457                 struct slot_info *s = slot + i;
 458                 if (s->format < 0)
 459                         continue;
 460                 if (!s->receiver_node)
 461                         continue;
 462                 task_notify(s->receiver_node->task, error);
 463         }
 464 }
 465
 466 static int get_empty_slot(void)
 467 {
 468         int i;
 469         struct slot_info *s;
 470
 471         FOR_EACH_SLOT(i) {
 472                 s = &slot[i];
 473                 if (s->format < 0) {
 474                         clear_slot(i);
 475                         return i;
 476                 }
 477                 if (s->wns || s->receiver_node || s->fns)
 478                         continue;
 479                 clear_slot(i);
 480                 return i;
 481         }
 482         return -E_NO_MORE_SLOTS;
 483 }
 484
 485 static void open_filters(struct slot_info *s)
 486 {
 487         struct audio_format_info *a = afi + s->format;
 488         struct filter_node *fn;
 489         int nf = a->num_filters;
 490         struct btr_node *parent;
 491         int i;
 492
 493         if (nf == 0)
 494                 return;
 495         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 496         assert(s->fns == NULL);
 497         s->fns = para_calloc(nf * sizeof(struct filter_node));
 498         parent = s->receiver_node->btrn;
 499         for (i = 0; i < nf; i++) {
 500                 char buf[20];
 501                 struct filter *f = filters + a->filter_nums[i];
 502                 fn = s->fns + i;
 503                 fn->filter_num = a->filter_nums[i];
 504                 fn->conf = a->filter_conf[i];
 505                 fn->btrn = btr_new_node(&(struct btr_node_description)
 506                         EMBRACE(.name = f->name, .parent = parent,
 507                                 .handler = f->execute, .context = fn));
 508
 509                 f->open(fn);
 510                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 511                 fn->task = task_register(&(struct task_info) {
 512                         .name = buf,
 513                         .pre_select = f->pre_select,
 514                         .post_select = f->post_select,
 515                         .context = fn,
 516                 }, &sched);
 517                 parent = fn->btrn;
 518                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 519                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 520         }
 521 }
 522
 523 static void open_writers(struct slot_info *s)
 524 {
 525         int i;
 526         struct audio_format_info *a = afi + s->format;
 527         struct writer_node *wn;
 528         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 529
 530         assert(s->wns == NULL);
 531         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 532                 * sizeof(struct writer_node));
 533         for (i = 0; i < a->num_writers; i++) {
 534                 wn = s->wns + i;
 535                 wn->conf = a->writer_conf[i];
 536                 wn->writer_num = a->writer_nums[i];
 537                 register_writer_node(wn, parent, &sched);
 538                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 539                         writer_names[a->writer_nums[i]], (int)(s - slot));
 540         }
 541 }
 542
 543 /* returns slot num on success */
 544 static int open_receiver(int format)
 545 {
 546         struct audio_format_info *a = &afi[format];
 547         struct slot_info *s;
 548         int ret, slot_num;
 549         struct receiver *r = a->receiver;
 550         struct receiver_node *rn;
 551
 552         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 553         ret = get_empty_slot();
 554         if (ret < 0)
 555                 return ret;
 556         slot_num = ret;
 557         rn = para_calloc(sizeof(*rn));
 558         rn->receiver = r;
 559         rn->conf = a->receiver_conf;
 560         rn->btrn = btr_new_node(&(struct btr_node_description)
 561                 EMBRACE(.name = r->name, .context = rn));
 562         ret = r->open(rn);
 563         if (ret < 0) {
 564                 btr_remove_node(&rn->btrn);
 565                 free(rn);
 566                 return ret;
 567         }
 568         s = &slot[slot_num];
 569         s->format = format;
 570         s->receiver_node = rn;
 571         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 572                 audio_formats[format], r->name, slot_num);
 573         rn->task = task_register(&(struct task_info) {
 574                 .name = r->name,
 575                 .pre_select = r->pre_select,
 576                 .post_select = r->post_select,
 577                 .context = rn,
 578         }, &sched);
 579         return slot_num;
 580 }
 581
 582 static bool receiver_running(void)
 583 {
 584         int i;
 585         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 586
 587         FOR_EACH_SLOT(i) {
 588                 struct slot_info *s = &slot[i];
 589                 long unsigned ss2 = s->server_stream_start.tv_sec;
 590
 591                 if (!s->receiver_node)
 592                         continue;
 593                 if (task_status(s->receiver_node->task) >= 0)
 594                         return true;
 595                 if (ss1 == ss2)
 596                         return true;
 597         }
 598         return false;
 599 }
 600
 601 /**
 602  * Return the root node of the current buffer tree.
 603  *
 604  * This is only used for stream grabbing.
 605  *
 606  * \return \p NULL if no slot is currently active. If more than one buffer tree
 607  * exists, the node corresponding to the most recently started receiver is
 608  * returned.
 609  */
 610 struct btr_node *audiod_get_btr_root(void)
 611 {
 612         int i, newest_slot = -1;
 613         struct timeval newest_rstime = {0, 0};
 614
 615         FOR_EACH_SLOT(i) {
 616                 struct slot_info *s = &slot[i];
 617                 struct timeval rstime;
 618                 if (!s->receiver_node)
 619                         continue;
 620                 if (task_status(s->receiver_node->task) < 0)
 621                         continue;
 622                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 623                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 624                         continue;
 625                 newest_rstime = rstime;
 626                 newest_slot = i;
 627         }
 628         if (newest_slot == -1)
 629                 return NULL;
 630         return slot[newest_slot].receiver_node->btrn;
 631 }
 632
 633 /* whether a new instance of a decoder should be started. */
 634 static bool must_start_decoder(void)
 635 {
 636         int cafn = stat_task->current_audio_format_num;
 637         unsigned vs = stat_task->vss_status;
 638
 639         if (audiod_status != AUDIOD_ON)
 640                 return false;
 641         if (cafn < 0)
 642                 return false;
 643         if (!stat_task->ct)
 644                 return false;
 645         if (vs & VSS_STATUS_FLAG_NEXT)
 646                 return false;
 647         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 648                 return false;
 649         if (receiver_running())
 650                 return false;
 651         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 652                 return false;
 653         return true;
 654 }
 655
 656 static void compute_time_diff(const struct timeval *status_time)
 657 {
 658         struct timeval tmp, diff;
 659         static unsigned count;
 660         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 661         const struct timeval max_deviation = {0, 500 * 1000};
 662         const int time_smooth = 5;
 663
 664         sign = tv_diff(status_time, now, &diff);
 665 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 666 //                      sign, sa_time_diff_sign);
 667         if (!count) {
 668                 sa_time_diff_sign = sign;
 669                 stat_task->sa_time_diff = diff;
 670                 count++;
 671                 goto out;
 672         }
 673         if (count > 5) {
 674                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 675                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 676                         PARA_WARNING_LOG("time diff jump: %lims\n",
 677                                 s * tv2ms(&tmp));
 678         }
 679         count++;
 680         sa_time_diff_sign = tv_convex_combination(
 681                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 682                 count > 10? sign : sign * time_smooth, &diff,
 683                 &tmp);
 684         stat_task->sa_time_diff = tmp;
 685         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 686                 sign < 0? "-" : "+",
 687                 tv2ms(&diff),
 688                 sa_time_diff_sign < 0? "-" : "+",
 689                 tv2ms(&stat_task->sa_time_diff)
 690         );
 691 out:
 692         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 693 }
 694
 695 static int update_item(int itemnum, char *buf)
 696 {
 697         long unsigned sec, usec;
 698
 699         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 700                 return 1;
 701         free(stat_item_values[itemnum]);
 702         stat_item_values[itemnum] = para_strdup(buf);
 703         stat_client_write_item(itemnum);
 704         switch (itemnum) {
 705         case SI_STATUS_FLAGS:
 706                 stat_task->vss_status = 0;
 707                 if (strchr(buf, 'N'))
 708                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 709                 if (strchr(buf, 'P'))
 710                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 711                 break;
 712         case SI_OFFSET:
 713                 stat_task->offset_seconds = atoi(buf);
 714                 break;
 715         case SI_SECONDS_TOTAL:
 716                 stat_task->length_seconds = atoi(buf);
 717                 break;
 718         case SI_STREAM_START:
 719                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 720                         stat_task->server_stream_start.tv_sec = sec;
 721                         stat_task->server_stream_start.tv_usec = usec;
 722                 }
 723                 break;
 724         case SI_CURRENT_TIME:
 725                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 726                         struct timeval tv = {sec, usec};
 727                         compute_time_diff(&tv);
 728                 }
 729                 break;
 730         case SI_FORMAT:
 731                 stat_task->current_audio_format_num
 732                         = get_audio_format_num(buf);
 733         }
 734         return 1;
 735 }
 736
 737 static int parse_stream_command(const char *txt, char **cmd)
 738 {
 739         int ret, len;
 740         char *re, *p = strchr(txt, ':');
 741
 742         if (!p)
 743                 return -E_MISSING_COLON;
 744         *cmd = p + 1;
 745         len = p - txt;
 746         re = malloc(len + 1);
 747         strncpy(re, txt, len);
 748         re[len] = '\0';
 749         ret = get_matching_audio_format_nums(re);
 750         free(re);
 751         return ret;
 752 }
 753
 754 static int add_filter(int format, char *cmdline)
 755 {
 756         struct audio_format_info *a = &afi[format];
 757         int filter_num, nf = a->num_filters;
 758         void *cfg;
 759
 760         filter_num = check_filter_arg(cmdline, &cfg);
 761         if (filter_num < 0)
 762                 return filter_num;
 763         a->filter_conf = para_realloc(a->filter_conf,
 764                 (nf + 1) * sizeof(void *));
 765         a->filter_nums = para_realloc(a->filter_nums,
 766                 (nf + 1) * sizeof(unsigned));
 767         a->filter_nums[nf] = filter_num;
 768         a->filter_conf[nf] = cfg;
 769         a->num_filters++;
 770         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 771                 filters[filter_num].name);
 772         return filter_num;
 773 }
 774
 775 static int parse_writer_args(void)
 776 {
 777         int i, ret;
 778         char *cmd;
 779         struct audio_format_info *a;
 780
 781         for (i = 0; i < conf.writer_given; i++) {
 782                 void *wconf;
 783                 int j, nw, writer_num, af_mask;
 784
 785                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 786                 if (ret < 0)
 787                         return ret;
 788                 af_mask = ret;
 789                 FOR_EACH_AUDIO_FORMAT(j) {
 790                         a = afi + j;
 791                         if ((af_mask & (1 << j)) == 0) /* no match */
 792                                 continue;
 793                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 794                         nw = a->num_writers;
 795                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 796                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 797                         a->writer_nums[nw] = writer_num;
 798                         a->writer_conf[nw] = wconf;
 799                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 800                                 nw, writer_names[writer_num]);
 801                         a->num_writers++;
 802                 }
 803         }
 804         /* Use default writer for audio formats which are not yet set up. */
 805         FOR_EACH_AUDIO_FORMAT(i) {
 806                 void *writer_conf;
 807                 int writer_num;
 808                 a = afi + i;
 809                 if (a->num_writers > 0)
 810                         continue; /* already set up */
 811                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 812                 a->writer_nums = para_malloc(sizeof(int));
 813                 a->writer_nums[0] = writer_num;
 814                 a->writer_conf = para_malloc(sizeof(void *));
 815                 a->writer_conf[0] = writer_conf;
 816                 a->num_writers = 1;
 817                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 818                         writer_names[writer_num]);
 819         }
 820         return 1;
 821 }
 822
 823 static int parse_receiver_args(void)
 824 {
 825         int i, ret, receiver_num;
 826         char *cmd = NULL;
 827         struct audio_format_info *a;
 828
 829         for (i = conf.receiver_given - 1; i >= 0; i--) {
 830                 char *arg;
 831                 int j, af_mask;
 832
 833                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 834                 if (ret < 0)
 835                         goto out;
 836                 af_mask = ret;
 837                 FOR_EACH_AUDIO_FORMAT(j) {
 838                         a = afi + j;
 839                         if ((af_mask & (1 << j)) == 0) /* no match */
 840                                 continue;
 841                         /*
 842                          * If multiple receivers are given for this audio format, the
 843                          * last one wins and we have to free the previous receiver
 844                          * config here. Since we are iterating backwards, the winning
 845                          * receiver arg is in fact the first one given.
 846                          */
 847                         if (a->receiver_conf)
 848                                 a->receiver->free_config(a->receiver_conf);
 849                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 850                         ret = -E_RECV_SYNTAX;
 851                         if (!a->receiver_conf)
 852                                 goto out;
 853                         a->receiver = receivers + receiver_num;
 854                 }
 855         }
 856         /*
 857          * Use the first available receiver with no arguments for those audio
 858          * formats for which no receiver was specified.
 859          */
 860         cmd = para_strdup(receivers[0].name);
 861         FOR_EACH_AUDIO_FORMAT(i) {
 862                 a = &afi[i];
 863                 if (a->receiver_conf)
 864                         continue;
 865                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 866                 if (!a->receiver_conf)
 867                         return -E_RECV_SYNTAX;
 868                 a->receiver = &receivers[receiver_num];
 869         }
 870         FOR_EACH_AUDIO_FORMAT(i) {
 871                 a = afi + i;
 872                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 873                         audio_formats[i], a->receiver->name);
 874         }
 875         ret = 1;
 876 out:
 877         free(cmd);
 878         return ret;
 879 }
 880
 881 static int init_default_filters(void)
 882 {
 883         int i, ret = 1;
 884
 885         FOR_EACH_AUDIO_FORMAT(i) {
 886                 struct audio_format_info *a = &afi[i];
 887                 char *tmp;
 888                 int j;
 889
 890                 if (a->num_filters)
 891                         continue; /* no default -- nothing to to */
 892                 /*
 893                  * udp and dccp streams are fec-encoded, so add fecdec as the
 894                  * first filter.
 895                  */
 896                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 897                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 898                         tmp = para_strdup("fecdec");
 899                         add_filter(i, tmp);
 900                         free(tmp);
 901                         if (ret < 0)
 902                                 goto out;
 903                 }
 904                 /* add "dec" to audio format name */
 905                 tmp = make_message("%sdec", audio_formats[i]);
 906                 for (j = 0; filters[j].name; j++)
 907                         if (!strcmp(tmp, filters[j].name))
 908                                 break;
 909                 free(tmp);
 910                 ret = -E_UNSUPPORTED_FILTER;
 911                 if (!filters[j].name)
 912                         goto out;
 913                 tmp = para_strdup(filters[j].name);
 914                 ret = add_filter(i, tmp);
 915                 free(tmp);
 916                 if (ret < 0)
 917                         goto out;
 918                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 919                         filters[j].name);
 920         }
 921 out:
 922         return ret;
 923 }
 924
 925 static int parse_filter_args(void)
 926 {
 927         int i, j, ret, af_mask, num_matches;
 928
 929         for (i = 0; i < conf.filter_given; i++) {
 930                 char *arg;
 931                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 932                 if (ret < 0)
 933                         goto out;
 934                 af_mask = ret;
 935                 num_matches = 0;
 936                 FOR_EACH_AUDIO_FORMAT(j) {
 937                         if ((af_mask & (1 << j)) == 0) /* no match */
 938                                 continue;
 939                         ret = add_filter(j, arg);
 940                         if (ret < 0)
 941                                 goto out;
 942                         num_matches++;
 943                 }
 944                 if (num_matches == 0)
 945                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 946                                 conf.filter_arg[i]);
 947         }
 948         ret = init_default_filters(); /* use default values for the rest */
 949 out:
 950         return ret;
 951 }
 952
 953 static int parse_stream_args(void)
 954 {
 955         int ret;
 956
 957         ret = parse_receiver_args();
 958         if (ret < 0)
 959                 return ret;
 960         ret = parse_filter_args();
 961         if (ret < 0)
 962                 return ret;
 963         ret = parse_writer_args();
 964         if (ret < 0)
 965                 return ret;
 966         return 1;
 967 }
 968
 969 /* does not unlink socket on errors */
 970 static int audiod_get_socket(void)
 971 {
 972         struct sockaddr_un unix_addr;
 973         int ret, fd;
 974
 975         if (conf.socket_given)
 976                 socket_name = para_strdup(conf.socket_arg);
 977         else {
 978                 char *hn = para_hostname();
 979                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 980                         hn);
 981                 free(hn);
 982         }
 983         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 984         if (conf.force_given)
 985                 unlink(socket_name);
 986         ret = create_local_socket(socket_name, &unix_addr,
 987                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 988         if (ret < 0)
 989                 goto err;
 990         fd = ret;
 991         if (listen(fd , 5) < 0) {
 992                 ret = -ERRNO_TO_PARA_ERROR(errno);
 993                 goto err;
 994         }
 995         ret = mark_fd_nonblocking(fd);
 996         if (ret < 0)
 997                 goto err;
 998         return fd;
 999 err:
1000         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1001         exit(EXIT_FAILURE);
1002 }
1003
1004 static void signal_pre_select(struct sched *s, void *context)
1005 {
1006         struct signal_task *st = context;
1007         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1008 }
1009
1010 static int signal_post_select(struct sched *s, void *context)
1011 {
1012         struct signal_task *st = context;
1013         int ret, signum;
1014
1015         ret = task_get_notification(st->task);
1016         if (ret < 0)
1017                 return ret;
1018         signum = para_next_signal(&s->rfds);
1019         switch (signum) {
1020         case SIGINT:
1021         case SIGTERM:
1022         case SIGHUP:
1023                 PARA_NOTICE_LOG("received signal %d\n", signum);
1024                 task_notify_all(s, E_AUDIOD_SIGNAL);
1025                 return -E_AUDIOD_SIGNAL;
1026         }
1027         return 0;
1028 }
1029
1030 static void command_pre_select(struct sched *s, void *context)
1031 {
1032         struct command_task *ct = context;
1033         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1034 }
1035
1036 static int command_post_select(struct sched *s, void *context)
1037 {
1038         int ret;
1039         struct command_task *ct = context;
1040         static struct timeval last_status_dump;
1041         struct timeval tmp, delay;
1042         bool force = true;
1043
1044         ret = task_get_notification(ct->task);
1045         if (ret < 0)
1046                 return ret;
1047         ret = handle_connect(ct->fd, &s->rfds);
1048         if (ret < 0) {
1049                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1050                 if (ret == -E_AUDIOD_TERM) {
1051                         task_notify_all(s, -ret);
1052                         return ret;
1053                 }
1054         } else if (ret > 0)
1055                 goto dump;
1056
1057         /* if last status dump was less than 500ms ago, do nothing */
1058         delay.tv_sec = 0;
1059         delay.tv_usec = 500 * 1000;
1060         tv_add(&last_status_dump, &delay, &tmp);
1061         if (tv_diff(now, &tmp, NULL) < 0)
1062                 return 0;
1063
1064         /*
1065          * If last status dump was more than 5s ago, force update. Otherwise,
1066          * update only those items that have changed.
1067          */
1068         delay.tv_sec = 5;
1069         delay.tv_usec = 0;
1070         tv_add(&last_status_dump, &delay, &tmp);
1071         if (tv_diff(now, &tmp, NULL) < 0)
1072                 force = false;
1073 dump:
1074         audiod_status_dump(force);
1075         last_status_dump = *now;
1076         return 1;
1077 }
1078
1079 static void init_command_task(struct command_task *ct)
1080 {
1081         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1082
1083         ct->task = task_register(&(struct task_info) {
1084                 .name = "command",
1085                 .pre_select = command_pre_select,
1086                 .post_select = command_post_select,
1087                 .context = ct,
1088         }, &sched);
1089 }
1090
1091 static void close_stat_pipe(void)
1092 {
1093         if (!stat_task->ct)
1094                 return;
1095         task_reap(&stat_task->ct->task);
1096         client_close(stat_task->ct);
1097         stat_task->ct = NULL;
1098         clear_and_dump_items();
1099         stat_task->length_seconds = 0;
1100         stat_task->offset_seconds = 0;
1101         stat_task->vss_status = 0;
1102         stat_task->current_audio_format_num = -1;
1103         audiod_status_dump(true);
1104 }
1105
1106 /* avoid busy loop if server is down */
1107 static void set_stat_task_restart_barrier(unsigned seconds)
1108 {
1109         struct timeval delay = {seconds, 0};
1110         tv_add(now, &delay, &stat_task->restart_barrier);
1111 }
1112
1113 static bool must_close_slot(int slot_num)
1114 {
1115         struct slot_info *s = &slot[slot_num];
1116         struct audio_format_info *a = afi + s->format;
1117         int i;
1118
1119         if (s->format < 0)
1120                 return false;
1121         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1122                 return false;
1123         for (i = 0; i < a->num_filters; i++)
1124                 if (s->fns && task_status(s->fns[i].task) >= 0)
1125                         return false;
1126         if (a->num_writers > 0) {
1127                 for (i = 0; i < a->num_writers; i++)
1128                         if (s->wns && task_status(s->wns[i].task) >= 0)
1129                                 return false;
1130         } else {
1131                 if (s->wns && task_status(s->wns[0].task) >= 0)
1132                         return false;
1133         }
1134         return true;
1135 }
1136
1137 static void close_slot(int slot_num)
1138 {
1139         struct slot_info *s = slot + slot_num;
1140
1141         PARA_INFO_LOG("closing slot %d\n", slot_num);
1142         close_writers(s);
1143         close_filters(s);
1144         close_receiver(slot_num);
1145         clear_slot(slot_num);
1146 }
1147
1148 static void close_unused_slots(void)
1149 {
1150         int i;
1151
1152         FOR_EACH_SLOT(i)
1153                 if (must_close_slot(i))
1154                         close_slot(i);
1155 }
1156
1157 /*
1158  * Cleanup all resources.
1159  *
1160  * This performs various cleanups, removes the audiod socket and closes the
1161  * connection to para_server.
1162  */
1163 static void audiod_cleanup(void)
1164 {
1165         if (socket_name)
1166                 unlink(socket_name);
1167         close_stat_pipe();
1168         close_unused_slots();
1169         audiod_cmdline_parser_free(&conf);
1170         close_stat_clients();
1171 }
1172
1173 /*
1174  * Check if any receivers/filters/writers need to be started and do so if
1175  * necessary.
1176  */
1177 static void start_stop_decoders(void)
1178 {
1179         int ret;
1180         struct slot_info *sl;
1181
1182         close_unused_slots();
1183         if (audiod_status != AUDIOD_ON ||
1184                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1185                 return notify_receivers(E_NOT_PLAYING);
1186         if (!must_start_decoder())
1187                 return;
1188         ret = open_receiver(stat_task->current_audio_format_num);
1189         if (ret < 0) {
1190                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1191                 return;
1192         }
1193         sl = slot + ret;
1194         open_filters(sl);
1195         open_writers(sl);
1196         activate_grab_clients(&sched);
1197         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1198 }
1199
1200 static void status_pre_select(struct sched *s, void *context)
1201 {
1202         struct status_task *st = context;
1203         int i, ret, cafn = stat_task->current_audio_format_num;
1204
1205         if (must_start_decoder())
1206                 goto min_delay;
1207         FOR_EACH_SLOT(i)
1208                 if (must_close_slot(i))
1209                         goto min_delay;
1210         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1211         if (ret > 0)
1212                 goto min_delay;
1213         if (st->ct && audiod_status == AUDIOD_OFF)
1214                 goto min_delay;
1215         if (!st->ct && audiod_status != AUDIOD_OFF)
1216                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1217         if (cafn >= 0)
1218                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1219         /*
1220          * If para_server is playing we'd like to have a smooth time display
1221          * even if we are running in standby mode. So we request a timeout that
1222          * expires at the next full second.
1223          */
1224         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1225                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1226         return;
1227 min_delay:
1228         sched_min_delay(s);
1229 }
1230
1231 /* restart the client task if necessary */
1232 static int status_post_select(struct sched *s, void *context)
1233 {
1234         struct status_task *st = context;
1235         int ret;
1236
1237         ret = task_get_notification(st->task);
1238         if (ret < 0)
1239                 return ret;
1240         if (audiod_status == AUDIOD_OFF) {
1241                 if (!st->ct)
1242                         goto out;
1243                 if (task_status(st->ct->task) >= 0) {
1244                         task_notify(st->ct->task, E_AUDIOD_OFF);
1245                         goto out;
1246                 }
1247                 close_stat_pipe();
1248                 st->clock_diff_count = conf.clock_diff_count_arg;
1249                 goto out;
1250         }
1251         if (st->ct) {
1252                 char *buf;
1253                 size_t sz;
1254
1255                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1256                 if (ret < 0) {
1257                         close_stat_pipe();
1258                         goto out;
1259                 }
1260                 if (st->ct->status != CL_EXECUTING)
1261                         goto out;
1262                 if (ret == 0) {
1263                         struct timeval diff;
1264                         tv_diff(now, &st->last_status_read, &diff);
1265                         if (diff.tv_sec > 61)
1266                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1267                         goto out;
1268                 }
1269                 btr_merge(st->btrn, st->min_iqs);
1270                 sz = btr_next_buffer(st->btrn, &buf);
1271                 ret = for_each_stat_item(buf, sz, update_item);
1272                 if (ret < 0) {
1273                         task_notify(st->ct->task, -ret);
1274                         goto out;
1275                 }
1276                 if (sz != ret) {
1277                         btr_consume(st->btrn, sz - ret);
1278                         st->last_status_read = *now;
1279                         st->min_iqs = 0;
1280                 } else /* current status item crosses buffers */
1281                         st->min_iqs = sz + 1;
1282                 goto out;
1283         }
1284         btr_drain(st->btrn);
1285         st->current_audio_format_num = -1;
1286         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1287                 goto out;
1288         if (st->clock_diff_count) { /* get status only one time */
1289                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1290                 int argc = 5;
1291                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1292                 st->clock_diff_count--;
1293                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1294                 set_stat_task_restart_barrier(2);
1295
1296         } else {
1297                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1298                 int argc = 4;
1299                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1300                 set_stat_task_restart_barrier(5);
1301         }
1302         free(stat_item_values[SI_BASENAME]);
1303         stat_item_values[SI_BASENAME] = para_strdup(
1304                 "no connection to para_server");
1305         stat_client_write_item(SI_BASENAME);
1306         st->last_status_read = *now;
1307 out:
1308         start_stop_decoders();
1309         return 0;
1310 }
1311
1312 static void init_status_task(struct status_task *st)
1313 {
1314         memset(st, 0, sizeof(struct status_task));
1315         st->sa_time_diff_sign = 1;
1316         st->clock_diff_count = conf.clock_diff_count_arg;
1317         st->current_audio_format_num = -1;
1318         st->btrn = btr_new_node(&(struct btr_node_description)
1319                 EMBRACE(.name = "stat"));
1320
1321         stat_task->task = task_register(&(struct task_info) {
1322                 .name = "stat",
1323                 .pre_select = status_pre_select,
1324                 .post_select = status_post_select,
1325                 .context = stat_task,
1326         }, &sched);
1327 }
1328
1329 static void set_initial_status(void)
1330 {
1331         audiod_status = AUDIOD_ON;
1332         if (!conf.mode_given)
1333                 return;
1334         if (!strcmp(conf.mode_arg, "sb")) {
1335                 audiod_status = AUDIOD_STANDBY;
1336                 return;
1337         }
1338         if (!strcmp(conf.mode_arg, "off")) {
1339                 audiod_status = AUDIOD_OFF;
1340                 return;
1341         }
1342         if (strcmp(conf.mode_arg, "on"))
1343                 PARA_WARNING_LOG("invalid mode\n");
1344 }
1345
1346 __noreturn static void print_help_and_die(void)
1347 {
1348         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1349         bool d = conf.detailed_help_given;
1350         unsigned flags;
1351
1352         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1353         ggo_print_help(&h, flags);
1354
1355         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1356         print_receiver_helps(flags);
1357         print_filter_helps(flags);
1358         print_writer_helps(flags);
1359         exit(0);
1360 }
1361
1362 static void init_colors_or_die(void)
1363 {
1364         int i;
1365
1366         if (!want_colors())
1367                 return;
1368         daemon_set_default_log_colors();
1369         daemon_set_flag(DF_COLOR_LOG);
1370         for (i = 0; i < conf.log_color_given; i++)
1371                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1372 }
1373
1374 /**
1375  * the main function of para_audiod
1376  *
1377  * \param argc usual argument count
1378  * \param argv usual argument vector
1379  *
1380  * \return EXIT_SUCCESS or EXIT_FAILURE
1381  *
1382  * \sa para_audiod(1)
1383  * */
1384 int main(int argc, char *argv[])
1385 {
1386         int ret, i;
1387         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1388         struct audiod_cmdline_parser_params params = {
1389                 .override = 0,
1390                 .initialize = 1,
1391                 .check_required = 0,
1392                 .check_ambiguity = 0,
1393                 .print_errors = 1
1394         };
1395
1396         valid_fd_012();
1397         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1398         daemon_set_loglevel(conf.loglevel_arg);
1399         version_handle_flag("audiod", conf.version_given);
1400         /* init receivers/filters/writers early to make help work */
1401         recv_init();
1402         filter_init();
1403         writer_init();
1404         if (conf.help_given || conf.detailed_help_given)
1405                 print_help_and_die();
1406         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1407         parse_config_or_die();
1408         init_colors_or_die();
1409         init_random_seed_or_die();
1410         daemon_set_flag(DF_LOG_TIME);
1411         daemon_set_flag(DF_LOG_HOSTNAME);
1412         daemon_set_flag(DF_LOG_LL);
1413         if (conf.log_timing_given)
1414                 daemon_set_flag(DF_LOG_TIMING);
1415         if (conf.logfile_given) {
1416                 daemon_set_logfile(conf.logfile_arg);
1417                 daemon_open_log_or_die();
1418         }
1419         ret = parse_stream_args();
1420         if (ret < 0) {
1421                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1422                 exit(EXIT_FAILURE);
1423         }
1424         daemon_log_welcome("para_audiod");
1425         daemon_set_start_time();
1426         set_initial_status();
1427         FOR_EACH_SLOT(i)
1428                 clear_slot(i);
1429         setup_signal_handling();
1430
1431         init_status_task(stat_task);
1432         init_command_task(cmd_task);
1433
1434         if (conf.daemon_given)
1435                 daemonize(false /* parent exits immediately */);
1436
1437         sig_task->task = task_register(&(struct task_info) {
1438                 .name = "signal",
1439                 .pre_select = signal_pre_select,
1440                 .post_select = signal_post_select,
1441                 .context = sig_task,
1442         }, &sched);
1443
1444         sched.default_timeout.tv_sec = 2;
1445         sched.default_timeout.tv_usec = 999 * 1000;
1446         ret = schedule(&sched);
1447         audiod_cleanup();
1448         sched_shutdown(&sched);
1449
1450         if (ret < 0)
1451                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1452         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1453 }