audiod.c

   1 /*
   2  * Copyright (C) 2005 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 #include <pwd.h>
  18
  19 #include "para.h"
  20 #include "error.h"
  21 #include "crypt.h"
  22 #include "audiod.cmdline.h"
  23 #include "list.h"
  24 #include "sched.h"
  25 #include "ggo.h"
  26 #include "buffer_tree.h"
  27 #include "recv.h"
  28 #include "filter.h"
  29 #include "grab_client.h"
  30 #include "client.cmdline.h"
  31 #include "client.h"
  32 #include "audiod.h"
  33 #include "net.h"
  34 #include "daemon.h"
  35 #include "string.h"
  36 #include "fd.h"
  37 #include "write.h"
  38 #include "write_common.h"
  39 #include "signal.h"
  40 #include "version.h"
  41
  42 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  43 /** define the array of error lists needed by para_audiod */
  44 INIT_AUDIOD_ERRLISTS;
  45 /** define the array containing all supported audio formats */
  46 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  47
  48 DEFINE_RECEIVER_ARRAY;
  49
  50 /** Defines how audiod handles one supported audio format. */
  51 struct audio_format_info {
  52         /** pointer to the receiver for this audio format */
  53         struct receiver *receiver;
  54         /** the receiver configuration */
  55         void *receiver_conf;
  56         /** the number of filters that should be activated for this audio format */
  57         unsigned int num_filters;
  58         /** Array of filter numbers to be activated. */
  59         unsigned *filter_nums;
  60         /** Pointer to the array of filter configurations. */
  61         void **filter_conf;
  62         /** the number of filters that should be activated for this audio format */
  63         unsigned int num_writers;
  64         /** Array of writer numbers to be activated. */
  65         int *writer_nums;
  66         /** pointer to the array of writer configurations */
  67         void **writer_conf;
  68         /** do not start receiver/filters/writer before this time */
  69         struct timeval restart_barrier;
  70 };
  71
  72 /**
  73  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  74  * be associated with a receiver/filter/writer triple. This array holds all
  75  * information on the status of these slots.
  76  *
  77  * \sa struct slot_info
  78  * */
  79 struct slot_info slot[MAX_STREAM_SLOTS];
  80
  81 /** The vss status flags audiod is interested in. */
  82 enum vss_status_flags {
  83         /** Whether the 'N' flag is set. */
  84         VSS_STATUS_FLAG_NEXT = 1,
  85         /** The 'P' flag is set. */
  86         VSS_STATUS_FLAG_PLAYING = 2,
  87 };
  88
  89 /**
  90  * The scheduler instance of para_audiod.
  91  *
  92  * This is needed also in audiod_command.c (for the tasks command), so it can
  93  * not be made static.
  94  */
  95 struct sched sched = {.max_fileno = 0};
  96
  97 /* The task for obtaining para_server's status (para_client stat). */
  98 struct status_task {
  99         /** The associated task structure of audiod. */
 100         struct task *task;
 101         /** Client data associated with the stat task. */
 102         struct client_task *ct;
 103         /** Do not restart client command until this time. */
 104         struct timeval restart_barrier;
 105         /** Last time we received status data from para_server. */
 106         struct timeval last_status_read;
 107         size_t min_iqs;
 108         /** The offset value announced by para_server. */
 109         int offset_seconds;
 110         /** The length of the current audio file as announced by para_server. */
 111         int length_seconds;
 112         /** The start of the current stream from the view of para_server. */
 113         struct timeval server_stream_start;
 114         /** The average time deviation between para_server and para_audiod. */
 115         struct timeval sa_time_diff;
 116         /** Whether client time is ahead of server time. */
 117         int sa_time_diff_sign;
 118         /** The 'P' and the 'N' flags as announced by para_server. */
 119         enum vss_status_flags vss_status;
 120         /** Number of times the clock difference is to be checked. */
 121         unsigned clock_diff_count;
 122         /** When to start the next check for clock difference. */
 123         struct timeval clock_diff_barrier;
 124         /** Number of the audio format as announced by para_server. */
 125         int current_audio_format_num;
 126         /* The status task btrn is the child of the client task. */
 127         struct btr_node *btrn;
 128 };
 129
 130 /** The array of status items sent by para_server. */
 131 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 132
 133 /**
 134  * the current mode of operation of which can be changed by the on/off/cycle
 135  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 136  */
 137 int audiod_status = AUDIOD_ON;
 138
 139 /**
 140  * the gengetopt args_info struct that holds information on all command line
 141  * arguments
 142  */
 143 struct audiod_args_info conf;
 144
 145 static char *socket_name;
 146 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 147
 148 static struct signal_task *signal_task;
 149
 150 static struct status_task status_task_struct;
 151
 152 static uid_t *uid_whitelist;
 153
 154 /**
 155  * the task that calls the status command of para_server
 156  *
 157  * \sa struct status_task
 158  */
 159 static struct status_task *stat_task = &status_task_struct;
 160
 161 /*
 162  * The task for handling audiod commands.
 163  *
 164  * We need two listening sockets for backward compability: on Linux systems
 165  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 166  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 167  * systems, fd[0] is negative, and only the pathname socket is used.
 168  *
 169  * For 0.5.x we accept connections on both sockets to make sure that old
 170  * para_audioc versions can still connect. New versions use only the abstract
 171  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 172  * abstract one (Linux) or a pathname socket (all other systems).
 173  */
 174 struct command_task {
 175         /** The local listening sockets. */
 176         int fd[2];
 177         /** the associated task structure */
 178         struct task *task;
 179 };
 180
 181 /** iterate over all supported audio formats */
 182 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 183
 184 /**
 185  * Get the audio format number.
 186  *
 187  * \param name The name of the audio format.
 188  *
 189  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 190  * \a name is not a supported audio format.
 191  */
 192 static int get_audio_format_num(const char *name)
 193 {
 194         int i;
 195
 196         while (para_isspace(*name))
 197                 name++;
 198         FOR_EACH_AUDIO_FORMAT(i)
 199                 if (!strcmp(name, audio_formats[i]))
 200                         return i;
 201         return -E_UNSUPPORTED_AUDIO_FORMAT;
 202 }
 203
 204 static int get_matching_audio_format_nums(const char *re)
 205 {
 206         int i, ret;
 207         regex_t preg;
 208
 209         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 210         if (ret < 0)
 211                 return ret;
 212         ret = 0;
 213         FOR_EACH_AUDIO_FORMAT(i)
 214                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 215                         ret |= (1 << i);
 216         regfree(&preg);
 217         return ret;
 218 }
 219
 220 /**
 221  * Compute the play time based on information of the given slot.
 222  *
 223  * \param slot_num The slot number (negative means: no slot).
 224  *
 225  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 226  * from the status items received from para_server and the start time of the
 227  * (first) writer of the given slot.
 228  *
 229  * It has to take into account that the stream was probably not started at
 230  * the beginning of the file, that the clock between the server and the client
 231  * host may differ and that playback of the stream was delayed, e.g. because
 232  * the prebuffer filter is used in the filter configuration of the given slot.
 233  *
 234  * If no writer is active in the given slot, or \a slot_num is negative
 235  * (indicating that para_audiod runs in standby mode), an approximation based
 236  * only on the status items is computed and the returned string is prefixed
 237  * with "~".
 238  *
 239  * \return A string that must be freed by the caller.
 240  */
 241 char *get_time_string(int slot_num)
 242 {
 243         int ret, seconds = 0, length;
 244         struct timeval *tmp, sum, sss, /* server stream start */
 245                 rstime, /* receiver start time */
 246                 wstime, /* writer start time */
 247                 wtime, /* now - writer start */
 248                 rskip; /* receiver start - sss */
 249         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 250         char *msg;
 251
 252         if (audiod_status == AUDIOD_OFF)
 253                 goto empty;
 254         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 255                 if (stat_task->length_seconds) /* paused */
 256                         return NULL;
 257                 goto empty; /* stopped */
 258         }
 259         if (audiod_status == AUDIOD_ON && !s)
 260                 goto empty;
 261         /*
 262          * Valid status items and playing, set length and tmp to the stream
 263          * start. We use the slot info and fall back to the info from current
 264          * status items if no slot info is available.
 265          */
 266         length = stat_task->length_seconds;
 267         tmp = &stat_task->server_stream_start;
 268         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 269                 btr_get_node_start(s->wns[0].btrn, &wstime);
 270                 if (wstime.tv_sec != 0) { /* writer wrote something */
 271                         if (s->server_stream_start.tv_sec == 0) {
 272                                 /* copy status info to slot */
 273                                 s->server_stream_start = stat_task->server_stream_start;
 274                                 s->offset_seconds = stat_task->offset_seconds;
 275                                 s->seconds_total = stat_task->length_seconds;
 276                         }
 277                         length = s->seconds_total;
 278                         tmp = &s->server_stream_start;
 279                 }
 280         }
 281         if (stat_task->sa_time_diff_sign > 0)
 282                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 283         else
 284                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 285         if (!s || !s->wns || !s->wns[0].btrn) {
 286                 struct timeval diff;
 287                 tv_diff(now, &sss, &diff);
 288                 seconds = diff.tv_sec + stat_task->offset_seconds;
 289                 goto out;
 290         }
 291         tv_diff(now, &wstime, &wtime);
 292         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 293         seconds = s->offset_seconds;
 294         if (s->receiver_node->btrn) {
 295                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 296                 ret = tv_diff(&rstime, &sss, &rskip);
 297                 if (ret > 0) { /* audiod was started in the middle of the stream */
 298                         tv_add(&wtime, &rskip, &sum);
 299                         seconds += sum.tv_sec;
 300                 } else
 301                         seconds += wtime.tv_sec;
 302         } else
 303                 seconds += wtime.tv_sec;
 304 out:
 305         seconds = PARA_MIN(seconds, length);
 306         seconds = PARA_MAX(seconds, 0);
 307         msg = make_message(
 308                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 309                 s? "" : "~",
 310                 seconds / 60,
 311                 seconds % 60,
 312                 (length - seconds) / 60,
 313                 (length - seconds) % 60,
 314                 length? (seconds * 100 + length / 2) / length : 0,
 315                 length / 60,
 316                 length % 60
 317         );
 318         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 319         return msg;
 320 empty:
 321         return para_strdup(NULL);
 322 }
 323
 324 static void parse_config_or_die(void)
 325 {
 326         int ret, i;
 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                 free(config_file);
 347                 goto err;
 348         }
 349         if (ret) {
 350                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 351                 daemon_set_loglevel(conf.loglevel_arg);
 352         }
 353         free(config_file);
 354         if (conf.user_allow_given > 0) {
 355                 uid_whitelist = para_malloc(conf.user_allow_given
 356                         * sizeof(uid_t));
 357                 for (i = 0; i < conf.user_allow_given; i++) {
 358                         int32_t val;
 359                         struct passwd *pw;
 360                         ret = para_atoi32(conf.user_allow_arg[i], &val);
 361                         if (ret >= 0) {
 362                                 uid_whitelist[i] = val;
 363                                 continue;
 364                         }
 365                         errno = 0; /* see getpwnam(3) */
 366                         pw = getpwnam(conf.user_allow_arg[i]);
 367                         if (!pw) {
 368                                 PARA_EMERG_LOG("invalid username: %s\n",
 369                                         conf.user_allow_arg[i]);
 370                                 goto err;
 371                         }
 372                         uid_whitelist[i] = pw->pw_uid;
 373                 }
 374         }
 375         return;
 376 err:
 377         exit(EXIT_FAILURE);
 378 }
 379
 380 static void setup_signal_handling(void)
 381 {
 382         signal_task = signal_init_or_die();
 383         para_install_sighandler(SIGINT);
 384         para_install_sighandler(SIGTERM);
 385         para_install_sighandler(SIGHUP);
 386         para_sigaction(SIGPIPE, SIG_IGN);
 387 }
 388
 389 static void clear_slot(int slot_num)
 390 {
 391         struct slot_info *s = &slot[slot_num];
 392
 393         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 394         memset(s, 0, sizeof(struct slot_info));
 395         s->format = -1;
 396 }
 397
 398 static void close_receiver(int slot_num)
 399 {
 400         struct slot_info *s = &slot[slot_num];
 401         struct audio_format_info *a;
 402
 403         if (s->format < 0 || !s->receiver_node)
 404                 return;
 405         a = &afi[s->format];
 406         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 407                 audio_formats[s->format], slot_num);
 408         a->receiver->close(s->receiver_node);
 409         btr_remove_node(&s->receiver_node->btrn);
 410         task_reap(&s->receiver_node->task);
 411         free(s->receiver_node);
 412         s->receiver_node = NULL;
 413         stat_task->current_audio_format_num = -1;
 414         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 415                 &a->restart_barrier);
 416 }
 417
 418 static void writer_cleanup(struct writer_node *wn)
 419 {
 420         struct writer *w;
 421
 422         if (!wn)
 423                 return;
 424         w = writers + wn->writer_num;
 425         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 426         w->close(wn);
 427         btr_remove_node(&wn->btrn);
 428         task_reap(&wn->task);
 429 }
 430
 431 static void close_writers(struct slot_info *s)
 432 {
 433         struct audio_format_info *a;
 434         int i;
 435
 436         if (s->format < 0)
 437                 return;
 438         assert(s->wns);
 439         a = afi + s->format;
 440         if (a->num_writers == 0)
 441                 writer_cleanup(s->wns);
 442         else {
 443                 for (i = 0; i < a->num_writers; i++)
 444                         writer_cleanup(s->wns + i);
 445         }
 446         free(s->wns);
 447         s->wns = NULL;
 448 }
 449
 450 static void close_filters(struct slot_info *s)
 451 {
 452         int i;
 453         struct audio_format_info *a = afi + s->format;
 454         if (a->num_filters == 0)
 455                 return;
 456         for (i = a->num_filters - 1; i >= 0; i--) {
 457                 struct filter_node *fn = s->fns + i;
 458                 struct filter *f;
 459
 460                 if (!fn)
 461                         continue;
 462                 f = filters + fn->filter_num;
 463                 if (f->close)
 464                         f->close(fn);
 465                 btr_remove_node(&fn->btrn);
 466                 task_reap(&fn->task);
 467         }
 468         free(s->fns);
 469         s->fns = NULL;
 470 }
 471
 472 static void notify_receivers(int error)
 473 {
 474         int i;
 475
 476         FOR_EACH_SLOT(i) {
 477                 struct slot_info *s = slot + i;
 478                 if (s->format < 0)
 479                         continue;
 480                 if (!s->receiver_node)
 481                         continue;
 482                 task_notify(s->receiver_node->task, error);
 483         }
 484 }
 485
 486 static int get_empty_slot(void)
 487 {
 488         int i;
 489         struct slot_info *s;
 490
 491         FOR_EACH_SLOT(i) {
 492                 s = &slot[i];
 493                 if (s->format < 0) {
 494                         clear_slot(i);
 495                         return i;
 496                 }
 497                 if (s->wns || s->receiver_node || s->fns)
 498                         continue;
 499                 clear_slot(i);
 500                 return i;
 501         }
 502         return -E_NO_MORE_SLOTS;
 503 }
 504
 505 static void open_filters(struct slot_info *s)
 506 {
 507         struct audio_format_info *a = afi + s->format;
 508         struct filter_node *fn;
 509         int nf = a->num_filters;
 510         struct btr_node *parent;
 511         int i;
 512
 513         if (nf == 0)
 514                 return;
 515         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 516         assert(s->fns == NULL);
 517         s->fns = para_calloc(nf * sizeof(struct filter_node));
 518         parent = s->receiver_node->btrn;
 519         for (i = 0; i < nf; i++) {
 520                 char buf[20];
 521                 struct filter *f = filters + a->filter_nums[i];
 522                 fn = s->fns + i;
 523                 fn->filter_num = a->filter_nums[i];
 524                 fn->conf = a->filter_conf[i];
 525                 fn->btrn = btr_new_node(&(struct btr_node_description)
 526                         EMBRACE(.name = f->name, .parent = parent,
 527                                 .handler = f->execute, .context = fn));
 528
 529                 f->open(fn);
 530                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 531                 fn->task = task_register(&(struct task_info) {
 532                         .name = buf,
 533                         .pre_select = f->pre_select,
 534                         .post_select = f->post_select,
 535                         .context = fn,
 536                 }, &sched);
 537                 parent = fn->btrn;
 538                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 539                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 540         }
 541 }
 542
 543 static void open_writers(struct slot_info *s)
 544 {
 545         int i;
 546         struct audio_format_info *a = afi + s->format;
 547         struct writer_node *wn;
 548         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 549
 550         assert(s->wns == NULL);
 551         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 552                 * sizeof(struct writer_node));
 553         for (i = 0; i < a->num_writers; i++) {
 554                 wn = s->wns + i;
 555                 wn->conf = a->writer_conf[i];
 556                 wn->writer_num = a->writer_nums[i];
 557                 register_writer_node(wn, parent, &sched);
 558                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 559                         writer_names[a->writer_nums[i]], (int)(s - slot));
 560         }
 561 }
 562
 563 /* returns slot num on success */
 564 static int open_receiver(int format)
 565 {
 566         struct audio_format_info *a = &afi[format];
 567         struct slot_info *s;
 568         int ret, slot_num;
 569         struct receiver *r = a->receiver;
 570         struct receiver_node *rn;
 571
 572         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 573         ret = get_empty_slot();
 574         if (ret < 0)
 575                 return ret;
 576         slot_num = ret;
 577         rn = para_calloc(sizeof(*rn));
 578         rn->receiver = r;
 579         rn->conf = a->receiver_conf;
 580         rn->btrn = btr_new_node(&(struct btr_node_description)
 581                 EMBRACE(.name = r->name, .context = rn));
 582         ret = r->open(rn);
 583         if (ret < 0) {
 584                 btr_remove_node(&rn->btrn);
 585                 free(rn);
 586                 return ret;
 587         }
 588         s = &slot[slot_num];
 589         s->format = format;
 590         s->receiver_node = rn;
 591         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 592                 audio_formats[format], r->name, slot_num);
 593         rn->task = task_register(&(struct task_info) {
 594                 .name = r->name,
 595                 .pre_select = r->pre_select,
 596                 .post_select = r->post_select,
 597                 .context = rn,
 598         }, &sched);
 599         return slot_num;
 600 }
 601
 602 static bool receiver_running(void)
 603 {
 604         int i;
 605         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 606
 607         FOR_EACH_SLOT(i) {
 608                 struct slot_info *s = &slot[i];
 609                 long unsigned ss2 = s->server_stream_start.tv_sec;
 610
 611                 if (!s->receiver_node)
 612                         continue;
 613                 if (task_status(s->receiver_node->task) >= 0)
 614                         return true;
 615                 if (ss1 == ss2)
 616                         return true;
 617         }
 618         return false;
 619 }
 620
 621 /**
 622  * Return the root node of the current buffer tree.
 623  *
 624  * This is only used for stream grabbing.
 625  *
 626  * \return \p NULL if no slot is currently active. If more than one buffer tree
 627  * exists, the node corresponding to the most recently started receiver is
 628  * returned.
 629  */
 630 struct btr_node *audiod_get_btr_root(void)
 631 {
 632         int i, newest_slot = -1;
 633         struct timeval newest_rstime = {0, 0};
 634
 635         FOR_EACH_SLOT(i) {
 636                 struct slot_info *s = &slot[i];
 637                 struct timeval rstime;
 638                 if (!s->receiver_node)
 639                         continue;
 640                 if (task_status(s->receiver_node->task) < 0)
 641                         continue;
 642                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 643                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 644                         continue;
 645                 newest_rstime = rstime;
 646                 newest_slot = i;
 647         }
 648         if (newest_slot == -1)
 649                 return NULL;
 650         return slot[newest_slot].receiver_node->btrn;
 651 }
 652
 653 /* whether a new instance of a decoder should be started. */
 654 static bool must_start_decoder(void)
 655 {
 656         int cafn = stat_task->current_audio_format_num;
 657         unsigned vs = stat_task->vss_status;
 658
 659         if (audiod_status != AUDIOD_ON)
 660                 return false;
 661         if (cafn < 0)
 662                 return false;
 663         if (!stat_task->ct)
 664                 return false;
 665         if (vs & VSS_STATUS_FLAG_NEXT)
 666                 return false;
 667         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 668                 return false;
 669         if (receiver_running())
 670                 return false;
 671         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 672                 return false;
 673         return true;
 674 }
 675
 676 static void compute_time_diff(const struct timeval *status_time)
 677 {
 678         struct timeval tmp, diff;
 679         static unsigned count;
 680         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 681         const struct timeval max_deviation = {0, 500 * 1000};
 682         const int time_smooth = 5;
 683
 684         sign = tv_diff(status_time, now, &diff);
 685 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 686 //                      sign, sa_time_diff_sign);
 687         if (!count) {
 688                 sa_time_diff_sign = sign;
 689                 stat_task->sa_time_diff = diff;
 690                 count++;
 691                 goto out;
 692         }
 693         if (count > 5) {
 694                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 695                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 696                         PARA_WARNING_LOG("time diff jump: %lims\n",
 697                                 s * tv2ms(&tmp));
 698         }
 699         count++;
 700         sa_time_diff_sign = tv_convex_combination(
 701                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 702                 count > 10? sign : sign * time_smooth, &diff,
 703                 &tmp);
 704         stat_task->sa_time_diff = tmp;
 705         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 706                 sign < 0? "-" : "+",
 707                 tv2ms(&diff),
 708                 sa_time_diff_sign < 0? "-" : "+",
 709                 tv2ms(&stat_task->sa_time_diff)
 710         );
 711 out:
 712         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 713 }
 714
 715 static int update_item(int itemnum, char *buf)
 716 {
 717         long unsigned sec, usec;
 718
 719         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 720                 return 1;
 721         free(stat_item_values[itemnum]);
 722         stat_item_values[itemnum] = para_strdup(buf);
 723         stat_client_write_item(itemnum);
 724         switch (itemnum) {
 725         case SI_STATUS_FLAGS:
 726                 stat_task->vss_status = 0;
 727                 if (strchr(buf, 'N'))
 728                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 729                 if (strchr(buf, 'P'))
 730                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 731                 break;
 732         case SI_OFFSET:
 733                 stat_task->offset_seconds = atoi(buf);
 734                 break;
 735         case SI_SECONDS_TOTAL:
 736                 stat_task->length_seconds = atoi(buf);
 737                 break;
 738         case SI_STREAM_START:
 739                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 740                         stat_task->server_stream_start.tv_sec = sec;
 741                         stat_task->server_stream_start.tv_usec = usec;
 742                 }
 743                 break;
 744         case SI_CURRENT_TIME:
 745                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 746                         struct timeval tv = {sec, usec};
 747                         compute_time_diff(&tv);
 748                 }
 749                 break;
 750         case SI_FORMAT:
 751                 stat_task->current_audio_format_num
 752                         = get_audio_format_num(buf);
 753         }
 754         return 1;
 755 }
 756
 757 static int parse_stream_command(const char *txt, char **cmd)
 758 {
 759         int ret, len;
 760         char *re, *p = strchr(txt, ':');
 761
 762         if (!p)
 763                 return -E_MISSING_COLON;
 764         *cmd = p + 1;
 765         len = p - txt;
 766         re = malloc(len + 1);
 767         strncpy(re, txt, len);
 768         re[len] = '\0';
 769         ret = get_matching_audio_format_nums(re);
 770         free(re);
 771         return ret;
 772 }
 773
 774 static int add_filter(int format, char *cmdline)
 775 {
 776         struct audio_format_info *a = &afi[format];
 777         int filter_num, nf = a->num_filters;
 778         void *cfg;
 779
 780         filter_num = check_filter_arg(cmdline, &cfg);
 781         if (filter_num < 0)
 782                 return filter_num;
 783         a->filter_conf = para_realloc(a->filter_conf,
 784                 (nf + 1) * sizeof(void *));
 785         a->filter_nums = para_realloc(a->filter_nums,
 786                 (nf + 1) * sizeof(unsigned));
 787         a->filter_nums[nf] = filter_num;
 788         a->filter_conf[nf] = cfg;
 789         a->num_filters++;
 790         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 791                 filters[filter_num].name);
 792         return filter_num;
 793 }
 794
 795 static int parse_writer_args(void)
 796 {
 797         int i, ret;
 798         char *cmd;
 799         struct audio_format_info *a;
 800
 801         for (i = 0; i < conf.writer_given; i++) {
 802                 void *wconf;
 803                 int j, nw, writer_num, af_mask;
 804
 805                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 806                 if (ret < 0)
 807                         return ret;
 808                 af_mask = ret;
 809                 FOR_EACH_AUDIO_FORMAT(j) {
 810                         a = afi + j;
 811                         if ((af_mask & (1 << j)) == 0) /* no match */
 812                                 continue;
 813                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 814                         nw = a->num_writers;
 815                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 816                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 817                         a->writer_nums[nw] = writer_num;
 818                         a->writer_conf[nw] = wconf;
 819                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 820                                 nw, writer_names[writer_num]);
 821                         a->num_writers++;
 822                 }
 823         }
 824         /* Use default writer for audio formats which are not yet set up. */
 825         FOR_EACH_AUDIO_FORMAT(i) {
 826                 void *writer_conf;
 827                 int writer_num;
 828                 a = afi + i;
 829                 if (a->num_writers > 0)
 830                         continue; /* already set up */
 831                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 832                 a->writer_nums = para_malloc(sizeof(int));
 833                 a->writer_nums[0] = writer_num;
 834                 a->writer_conf = para_malloc(sizeof(void *));
 835                 a->writer_conf[0] = writer_conf;
 836                 a->num_writers = 1;
 837                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 838                         writer_names[writer_num]);
 839         }
 840         return 1;
 841 }
 842
 843 static int parse_receiver_args(void)
 844 {
 845         int i, ret, receiver_num;
 846         char *cmd = NULL;
 847         struct audio_format_info *a;
 848
 849         for (i = conf.receiver_given - 1; i >= 0; i--) {
 850                 char *arg;
 851                 int j, af_mask;
 852
 853                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 854                 if (ret < 0)
 855                         goto out;
 856                 af_mask = ret;
 857                 FOR_EACH_AUDIO_FORMAT(j) {
 858                         a = afi + j;
 859                         if ((af_mask & (1 << j)) == 0) /* no match */
 860                                 continue;
 861                         /*
 862                          * If multiple receivers are given for this audio format, the
 863                          * last one wins and we have to free the previous receiver
 864                          * config here. Since we are iterating backwards, the winning
 865                          * receiver arg is in fact the first one given.
 866                          */
 867                         if (a->receiver_conf)
 868                                 a->receiver->free_config(a->receiver_conf);
 869                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 870                         ret = -E_RECV_SYNTAX;
 871                         if (!a->receiver_conf)
 872                                 goto out;
 873                         a->receiver = receivers + receiver_num;
 874                 }
 875         }
 876         /*
 877          * Use the first available receiver with no arguments for those audio
 878          * formats for which no receiver was specified.
 879          */
 880         cmd = para_strdup(receivers[0].name);
 881         FOR_EACH_AUDIO_FORMAT(i) {
 882                 a = &afi[i];
 883                 if (a->receiver_conf)
 884                         continue;
 885                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 886                 if (!a->receiver_conf)
 887                         return -E_RECV_SYNTAX;
 888                 a->receiver = &receivers[receiver_num];
 889         }
 890         FOR_EACH_AUDIO_FORMAT(i) {
 891                 a = afi + i;
 892                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 893                         audio_formats[i], a->receiver->name);
 894         }
 895         ret = 1;
 896 out:
 897         free(cmd);
 898         return ret;
 899 }
 900
 901 static int init_default_filters(void)
 902 {
 903         int i, ret = 1;
 904
 905         FOR_EACH_AUDIO_FORMAT(i) {
 906                 struct audio_format_info *a = &afi[i];
 907                 char *tmp;
 908                 int j;
 909
 910                 if (a->num_filters)
 911                         continue; /* no default -- nothing to to */
 912                 /*
 913                  * udp and dccp streams are fec-encoded, so add fecdec as the
 914                  * first filter.
 915                  */
 916                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 917                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 918                         tmp = para_strdup("fecdec");
 919                         add_filter(i, tmp);
 920                         free(tmp);
 921                         if (ret < 0)
 922                                 goto out;
 923                 }
 924                 /* add "dec" to audio format name */
 925                 tmp = make_message("%sdec", audio_formats[i]);
 926                 for (j = 0; filters[j].name; j++)
 927                         if (!strcmp(tmp, filters[j].name))
 928                                 break;
 929                 free(tmp);
 930                 ret = -E_UNSUPPORTED_FILTER;
 931                 if (!filters[j].name)
 932                         goto out;
 933                 tmp = para_strdup(filters[j].name);
 934                 ret = add_filter(i, tmp);
 935                 free(tmp);
 936                 if (ret < 0)
 937                         goto out;
 938                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 939                         filters[j].name);
 940         }
 941 out:
 942         return ret;
 943 }
 944
 945 static int parse_filter_args(void)
 946 {
 947         int i, j, ret, af_mask, num_matches;
 948
 949         for (i = 0; i < conf.filter_given; i++) {
 950                 char *arg;
 951                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 952                 if (ret < 0)
 953                         goto out;
 954                 af_mask = ret;
 955                 num_matches = 0;
 956                 FOR_EACH_AUDIO_FORMAT(j) {
 957                         if ((af_mask & (1 << j)) == 0) /* no match */
 958                                 continue;
 959                         ret = add_filter(j, arg);
 960                         if (ret < 0)
 961                                 goto out;
 962                         num_matches++;
 963                 }
 964                 if (num_matches == 0)
 965                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 966                                 conf.filter_arg[i]);
 967         }
 968         ret = init_default_filters(); /* use default values for the rest */
 969 out:
 970         return ret;
 971 }
 972
 973 static int parse_stream_args(void)
 974 {
 975         int ret;
 976
 977         ret = parse_receiver_args();
 978         if (ret < 0)
 979                 return ret;
 980         ret = parse_filter_args();
 981         if (ret < 0)
 982                 return ret;
 983         ret = parse_writer_args();
 984         if (ret < 0)
 985                 return ret;
 986         return 1;
 987 }
 988
 989 /* does not unlink socket on errors */
 990 static void init_local_sockets(struct command_task *ct)
 991 {
 992         if (conf.socket_given)
 993                 socket_name = para_strdup(conf.socket_arg);
 994         else {
 995                 char *hn = para_hostname();
 996                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 997                         hn);
 998                 free(hn);
 999         }
1000         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1001         if (conf.force_given)
1002                 unlink(socket_name);
1003         ct->fd[0] = create_local_socket(socket_name, 0);
1004         ct->fd[1] = create_local_socket(socket_name,
1005                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1006         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1007                 return;
1008         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1009         exit(EXIT_FAILURE);
1010 }
1011
1012 static int signal_post_select(struct sched *s, void *context)
1013 {
1014         struct signal_task *st = context;
1015         int ret, signum;
1016
1017         ret = task_get_notification(st->task);
1018         if (ret < 0)
1019                 return ret;
1020         signum = para_next_signal(&s->rfds);
1021         switch (signum) {
1022         case SIGINT:
1023         case SIGTERM:
1024         case SIGHUP:
1025                 PARA_NOTICE_LOG("received signal %d\n", signum);
1026                 task_notify_all(s, E_AUDIOD_SIGNAL);
1027                 return -E_AUDIOD_SIGNAL;
1028         }
1029         return 0;
1030 }
1031
1032 static void command_pre_select(struct sched *s, void *context)
1033 {
1034         struct command_task *ct = context;
1035         int i;
1036
1037         for (i = 0; i < 2; i++)
1038                 if (ct->fd[i] >= 0)
1039                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1040 }
1041
1042 static int command_post_select(struct sched *s, void *context)
1043 {
1044         int ret, i;
1045         struct command_task *ct = context;
1046         static struct timeval last_status_dump;
1047         struct timeval tmp, delay;
1048         bool force = false;
1049
1050         ret = task_get_notification(ct->task);
1051         if (ret < 0)
1052                 return ret;
1053         for (i = 0; i < 2; i++) {
1054                 if (ct->fd[i] < 0)
1055                         continue;
1056                 ret = handle_connect(ct->fd[i], &s->rfds, uid_whitelist);
1057                 if (ret < 0) {
1058                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1059                         if (ret == -E_AUDIOD_TERM) {
1060                                 task_notify_all(s, -ret);
1061                                 return ret;
1062                         }
1063                 } else if (ret > 0)
1064                         force = true;
1065         }
1066         if (force == true)
1067                 goto dump;
1068
1069         /* if last status dump was less than 500ms ago, do nothing */
1070         delay.tv_sec = 0;
1071         delay.tv_usec = 500 * 1000;
1072         tv_add(&last_status_dump, &delay, &tmp);
1073         if (tv_diff(now, &tmp, NULL) < 0)
1074                 return 0;
1075
1076         /*
1077          * If last status dump was more than 5s ago, force update. Otherwise,
1078          * update only those items that have changed.
1079          */
1080         delay.tv_sec = 5;
1081         delay.tv_usec = 0;
1082         tv_add(&last_status_dump, &delay, &tmp);
1083         if (tv_diff(now, &tmp, NULL) > 0)
1084                 force = true;
1085 dump:
1086         audiod_status_dump(force);
1087         last_status_dump = *now;
1088         return 1;
1089 }
1090
1091 static void init_command_task(struct command_task *ct)
1092 {
1093         init_local_sockets(ct); /* doesn't return on errors */
1094
1095         ct->task = task_register(&(struct task_info) {
1096                 .name = "command",
1097                 .pre_select = command_pre_select,
1098                 .post_select = command_post_select,
1099                 .context = ct,
1100         }, &sched);
1101 }
1102
1103 static void close_stat_pipe(void)
1104 {
1105         if (!stat_task->ct)
1106                 return;
1107         task_reap(&stat_task->ct->task);
1108         client_close(stat_task->ct);
1109         stat_task->ct = NULL;
1110         clear_and_dump_items();
1111         stat_task->length_seconds = 0;
1112         stat_task->offset_seconds = 0;
1113         stat_task->vss_status = 0;
1114         stat_task->current_audio_format_num = -1;
1115         audiod_status_dump(true);
1116 }
1117
1118 /* avoid busy loop if server is down */
1119 static void set_stat_task_restart_barrier(unsigned seconds)
1120 {
1121         struct timeval delay = {seconds, 0};
1122         tv_add(now, &delay, &stat_task->restart_barrier);
1123 }
1124
1125 static bool must_close_slot(int slot_num)
1126 {
1127         struct slot_info *s = &slot[slot_num];
1128         struct audio_format_info *a = afi + s->format;
1129         int i;
1130
1131         if (s->format < 0)
1132                 return false;
1133         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1134                 return false;
1135         for (i = 0; i < a->num_filters; i++)
1136                 if (s->fns && task_status(s->fns[i].task) >= 0)
1137                         return false;
1138         if (a->num_writers > 0) {
1139                 for (i = 0; i < a->num_writers; i++)
1140                         if (s->wns && task_status(s->wns[i].task) >= 0)
1141                                 return false;
1142         } else {
1143                 if (s->wns && task_status(s->wns[0].task) >= 0)
1144                         return false;
1145         }
1146         return true;
1147 }
1148
1149 static void close_slot(int slot_num)
1150 {
1151         struct slot_info *s = slot + slot_num;
1152
1153         PARA_INFO_LOG("closing slot %d\n", slot_num);
1154         close_writers(s);
1155         close_filters(s);
1156         close_receiver(slot_num);
1157         clear_slot(slot_num);
1158 }
1159
1160 static void close_unused_slots(void)
1161 {
1162         int i;
1163
1164         FOR_EACH_SLOT(i)
1165                 if (must_close_slot(i))
1166                         close_slot(i);
1167 }
1168
1169 /*
1170  * Cleanup all resources.
1171  *
1172  * This performs various cleanups, removes the audiod socket and closes the
1173  * connection to para_server.
1174  */
1175 static void audiod_cleanup(void)
1176 {
1177         if (socket_name)
1178                 unlink(socket_name);
1179         close_stat_pipe();
1180         close_unused_slots();
1181         audiod_cmdline_parser_free(&conf);
1182         close_stat_clients();
1183         free(uid_whitelist);
1184 }
1185
1186 /*
1187  * Check if any receivers/filters/writers need to be started and do so if
1188  * necessary.
1189  */
1190 static void start_stop_decoders(void)
1191 {
1192         int ret;
1193         struct slot_info *sl;
1194
1195         close_unused_slots();
1196         if (audiod_status != AUDIOD_ON ||
1197                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1198                 return notify_receivers(E_NOT_PLAYING);
1199         if (!must_start_decoder())
1200                 return;
1201         ret = open_receiver(stat_task->current_audio_format_num);
1202         if (ret < 0) {
1203                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1204                 return;
1205         }
1206         sl = slot + ret;
1207         open_filters(sl);
1208         open_writers(sl);
1209         activate_grab_clients(&sched);
1210         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1211 }
1212
1213 static void status_pre_select(struct sched *s, void *context)
1214 {
1215         struct status_task *st = context;
1216         int i, ret, cafn = stat_task->current_audio_format_num;
1217
1218         if (must_start_decoder())
1219                 goto min_delay;
1220         FOR_EACH_SLOT(i)
1221                 if (must_close_slot(i))
1222                         goto min_delay;
1223         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1224         if (ret > 0)
1225                 goto min_delay;
1226         if (st->ct && audiod_status == AUDIOD_OFF)
1227                 goto min_delay;
1228         if (!st->ct && audiod_status != AUDIOD_OFF)
1229                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1230         if (cafn >= 0)
1231                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1232         /*
1233          * If para_server is playing we'd like to have a smooth time display
1234          * even if we are running in standby mode. So we request a timeout that
1235          * expires at the next full second.
1236          */
1237         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1238                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1239         return;
1240 min_delay:
1241         sched_min_delay(s);
1242 }
1243
1244 /* restart the client task if necessary */
1245 static int status_post_select(struct sched *s, void *context)
1246 {
1247         struct status_task *st = context;
1248         int ret;
1249
1250         ret = task_get_notification(st->task);
1251         if (ret < 0)
1252                 return ret;
1253         if (audiod_status == AUDIOD_OFF) {
1254                 if (!st->ct)
1255                         goto out;
1256                 if (task_status(st->ct->task) >= 0) {
1257                         task_notify(st->ct->task, E_AUDIOD_OFF);
1258                         goto out;
1259                 }
1260                 close_stat_pipe();
1261                 st->clock_diff_count = conf.clock_diff_count_arg;
1262                 goto out;
1263         }
1264         if (st->ct) {
1265                 char *buf;
1266                 size_t sz;
1267
1268                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1269                 if (ret < 0) {
1270                         close_stat_pipe();
1271                         goto out;
1272                 }
1273                 if (st->ct->status != CL_EXECUTING)
1274                         goto out;
1275                 if (ret == 0) {
1276                         struct timeval diff;
1277                         tv_diff(now, &st->last_status_read, &diff);
1278                         if (diff.tv_sec > 61)
1279                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1280                         goto out;
1281                 }
1282                 btr_merge(st->btrn, st->min_iqs);
1283                 sz = btr_next_buffer(st->btrn, &buf);
1284                 ret = for_each_stat_item(buf, sz, update_item);
1285                 if (ret < 0) {
1286                         task_notify(st->ct->task, -ret);
1287                         goto out;
1288                 }
1289                 if (sz != ret) {
1290                         btr_consume(st->btrn, sz - ret);
1291                         st->last_status_read = *now;
1292                         st->min_iqs = 0;
1293                 } else /* current status item crosses buffers */
1294                         st->min_iqs = sz + 1;
1295                 goto out;
1296         }
1297         btr_drain(st->btrn);
1298         st->current_audio_format_num = -1;
1299         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1300                 goto out;
1301         if (st->clock_diff_count) { /* get status only one time */
1302                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1303                 int argc = 5;
1304                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1305                 st->clock_diff_count--;
1306                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1307                 set_stat_task_restart_barrier(2);
1308
1309         } else {
1310                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1311                 int argc = 4;
1312                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1313                 set_stat_task_restart_barrier(5);
1314         }
1315         free(stat_item_values[SI_BASENAME]);
1316         stat_item_values[SI_BASENAME] = para_strdup(
1317                 "no connection to para_server");
1318         stat_client_write_item(SI_BASENAME);
1319         st->last_status_read = *now;
1320 out:
1321         start_stop_decoders();
1322         return 0;
1323 }
1324
1325 static void init_status_task(struct status_task *st)
1326 {
1327         memset(st, 0, sizeof(struct status_task));
1328         st->sa_time_diff_sign = 1;
1329         st->clock_diff_count = conf.clock_diff_count_arg;
1330         st->current_audio_format_num = -1;
1331         st->btrn = btr_new_node(&(struct btr_node_description)
1332                 EMBRACE(.name = "stat"));
1333
1334         stat_task->task = task_register(&(struct task_info) {
1335                 .name = "stat",
1336                 .pre_select = status_pre_select,
1337                 .post_select = status_post_select,
1338                 .context = stat_task,
1339         }, &sched);
1340 }
1341
1342 static void set_initial_status(void)
1343 {
1344         audiod_status = AUDIOD_ON;
1345         if (!conf.mode_given)
1346                 return;
1347         if (!strcmp(conf.mode_arg, "sb")) {
1348                 audiod_status = AUDIOD_STANDBY;
1349                 return;
1350         }
1351         if (!strcmp(conf.mode_arg, "off")) {
1352                 audiod_status = AUDIOD_OFF;
1353                 return;
1354         }
1355         if (strcmp(conf.mode_arg, "on"))
1356                 PARA_WARNING_LOG("invalid mode\n");
1357 }
1358
1359 __noreturn static void print_help_and_die(void)
1360 {
1361         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1362         bool d = conf.detailed_help_given;
1363         unsigned flags;
1364
1365         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1366         ggo_print_help(&h, flags);
1367
1368         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1369         print_receiver_helps(flags);
1370         print_filter_helps(flags);
1371         print_writer_helps(flags);
1372         exit(0);
1373 }
1374
1375 /**
1376  * the main function of para_audiod
1377  *
1378  * \param argc usual argument count
1379  * \param argv usual argument vector
1380  *
1381  * \return EXIT_SUCCESS or EXIT_FAILURE
1382  *
1383  * \sa para_audiod(1)
1384  * */
1385 int main(int argc, char *argv[])
1386 {
1387         int ret, i;
1388         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1389         struct audiod_cmdline_parser_params params = {
1390                 .override = 0,
1391                 .initialize = 1,
1392                 .check_required = 0,
1393                 .check_ambiguity = 0,
1394                 .print_errors = 1
1395         };
1396
1397         valid_fd_012();
1398         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1399         daemon_set_loglevel(conf.loglevel_arg);
1400         version_handle_flag("audiod", conf.version_given);
1401         /* init receivers/filters/writers early to make help work */
1402         recv_init();
1403         filter_init();
1404         writer_init();
1405         if (conf.help_given || conf.detailed_help_given)
1406                 print_help_and_die();
1407         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1408         parse_config_or_die();
1409         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1410                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1411         init_random_seed_or_die();
1412         daemon_set_flag(DF_LOG_TIME);
1413         daemon_set_flag(DF_LOG_HOSTNAME);
1414         daemon_set_flag(DF_LOG_LL);
1415         if (conf.log_timing_given)
1416                 daemon_set_flag(DF_LOG_TIMING);
1417         if (conf.logfile_given) {
1418                 daemon_set_logfile(conf.logfile_arg);
1419                 daemon_open_log_or_die();
1420         }
1421         ret = parse_stream_args();
1422         if (ret < 0) {
1423                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1424                 exit(EXIT_FAILURE);
1425         }
1426         daemon_log_welcome("para_audiod");
1427         daemon_set_start_time();
1428         set_initial_status();
1429         FOR_EACH_SLOT(i)
1430                 clear_slot(i);
1431         setup_signal_handling();
1432
1433         init_status_task(stat_task);
1434         init_command_task(cmd_task);
1435
1436         if (conf.daemon_given)
1437                 daemonize(false /* parent exits immediately */);
1438
1439         signal_task->task = task_register(&(struct task_info) {
1440                 .name = "signal",
1441                 .pre_select = signal_pre_select,
1442                 .post_select = signal_post_select,
1443                 .context = signal_task,
1444         }, &sched);
1445
1446         sched.default_timeout.tv_sec = 2;
1447         sched.default_timeout.tv_usec = 999 * 1000;
1448         ret = schedule(&sched);
1449         audiod_cleanup();
1450         sched_shutdown(&sched);
1451         signal_shutdown(signal_task);
1452
1453         if (ret < 0)
1454                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1455         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1456 }