audiod.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8 #include <regex.h>
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11 #include <signal.h>
  12 #include <openssl/rc4.h>
  13 #include <stdbool.h>
  14
  15 #include "para.h"
  16 #include "error.h"
  17 #include "crypt.h"
  18 #include "audiod.cmdline.h"
  19 #include "list.h"
  20 #include "sched.h"
  21 #include "ggo.h"
  22 #include "recv.h"
  23 #include "buffer_tree.h"
  24 #include "filter.h"
  25 #include "grab_client.h"
  26 #include "client.cmdline.h"
  27 #include "client.h"
  28 #include "audiod.h"
  29 #include "net.h"
  30 #include "daemon.h"
  31 #include "string.h"
  32 #include "fd.h"
  33 #include "write.h"
  34 #include "write_common.h"
  35 #include "signal.h"
  36
  37 /** define the array of error lists needed by para_audiod */
  38 INIT_AUDIOD_ERRLISTS;
  39 /** define the array containing all supported audio formats */
  40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  41
  42 /** Defines how audiod handles one supported audio format. */
  43 struct audio_format_info {
  44         /** pointer to the receiver for this audio format */
  45         struct receiver *receiver;
  46         /** the receiver configuration */
  47         void *receiver_conf;
  48         /** the number of filters that should be activated for this audio format */
  49         unsigned int num_filters;
  50         /** Array of filter numbers to be activated. */
  51         unsigned *filter_nums;
  52         /** Pointer to the array of filter configurations. */
  53         void **filter_conf;
  54         /** the number of filters that should be activated for this audio format */
  55         unsigned int num_writers;
  56         /** Array of writer numbers to be activated. */
  57         int *writer_nums;
  58         /** pointer to the array of writer configurations */
  59         void **writer_conf;
  60         /** do not start receiver/filters/writer before this time */
  61         struct timeval restart_barrier;
  62 };
  63
  64 /**
  65  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  66  * be associated with a receiver/filter/writer triple. This array holds all
  67  * information on the status of these slots.
  68  *
  69  * \sa struct slot_info
  70  * */
  71 struct slot_info slot[MAX_STREAM_SLOTS];
  72
  73 /** The vss status flags audiod is interested in. */
  74 enum vss_status_flags {
  75         /** Whether the 'N' flag is set. */
  76         VSS_STATUS_FLAG_NEXT = 1,
  77         /** The 'P' flag is set. */
  78         VSS_STATUS_FLAG_PLAYING = 2,
  79 };
  80
  81 /**
  82  * The task for obtaining para_server's status (para_client stat).
  83  *
  84  * \sa struct task, struct sched.
  85  */
  86 struct status_task {
  87         /** The associated task structure of audiod. */
  88         struct task task;
  89         /** Client data associated with the stat task. */
  90         struct client_task *ct;
  91         /** Do not restart client command until this time. */
  92         struct timeval restart_barrier;
  93         /** Last time we received status data from para_server. */
  94         struct timeval last_status_read;
  95         /** The offset value announced by para_server. */
  96         int offset_seconds;
  97         /** The length of the current audio file as announced by para_server. */
  98         int length_seconds;
  99         /** The start of the current stream from the view of para_server. */
 100         struct timeval server_stream_start;
 101         /** The average time deviation between para_server and para_audiod. */
 102         struct timeval sa_time_diff;
 103         /** Whether client time is ahead of server time. */
 104         int sa_time_diff_sign;
 105         /** The 'P' and the 'N' flags as announced by para_server. */
 106         enum vss_status_flags vss_status;
 107         /** Number of times the clock difference is to be checked. */
 108         unsigned clock_diff_count;
 109         /** When to start the next check for clock difference. */
 110         struct timeval clock_diff_barrier;
 111         /** Number of the audio format as announced by para_server. */
 112         int current_audio_format_num;
 113         /* The status task btrn is the child of the client task. */
 114         struct btr_node *btrn;
 115 };
 116
 117 /** The array of status items sent by para_server. */
 118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 119
 120 /**
 121  * the current mode of operation of which can be changed by the on/off/cycle
 122  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 123  */
 124 int audiod_status = AUDIOD_ON;
 125
 126 /**
 127  * the gengetopt args_info struct that holds information on all command line
 128  * arguments
 129  */
 130 struct audiod_args_info conf;
 131
 132 static char *socket_name;
 133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 134
 135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 136
 137 static struct status_task status_task_struct;
 138
 139 /**
 140  * the task that calls the status command of para_server
 141  *
 142  * \sa struct status_task
 143  */
 144 static struct status_task *stat_task = &status_task_struct;
 145 static struct timeval initial_delay_barrier;
 146
 147 /**
 148  * the task for handling audiod commands
 149  *
 150  * \sa struct task, struct sched
 151  */
 152 struct command_task {
 153         /** the local listening socket */
 154         int fd;
 155         /** the associated task structure */
 156         struct task task;
 157 };
 158
 159 /** iterate over all supported audio formats */
 160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 161
 162 /**
 163  * get the audio format number
 164  * \param name the name of the audio format
 165  *
 166  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 167  * \a name is not a supported audio format.
 168  */
 169 int get_audio_format_num(const char *name)
 170 {
 171         int i;
 172
 173         while (para_isspace(*name))
 174                 name++;
 175         FOR_EACH_AUDIO_FORMAT(i)
 176                 if (!strcmp(name, audio_formats[i]))
 177                         return i;
 178         return -E_UNSUPPORTED_AUDIO_FORMAT;
 179 }
 180
 181 char *get_time_string(int slot_num)
 182 {
 183         int ret, seconds = 0, length;
 184         struct timeval *tmp, sum, sss, /* server stream start */
 185                 rstime, /* receiver start time */
 186                 wstime, /* writer start time */
 187                 wtime, /* now - writer start */
 188                 rskip; /* receiver start - sss */
 189         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 190         char *msg;
 191
 192         if (audiod_status == AUDIOD_OFF)
 193                 goto empty;
 194         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 195                 if (stat_task->length_seconds) /* paused */
 196                         return NULL;
 197                 goto empty; /* stopped */
 198         }
 199         if (audiod_status == AUDIOD_ON && !s)
 200                 goto empty;
 201         /*
 202          * Valid status items and playing, set length and tmp to the stream
 203          * start. We use the slot info and fall back to the info from current
 204          * status items if no slot info is available.
 205          */
 206         length = stat_task->length_seconds;
 207         tmp = &stat_task->server_stream_start;
 208         if (s && s->wns) { /* writer active in this slot */
 209                 btr_get_node_start(s->wns[0].btrn, &wstime);
 210                 if (wstime.tv_sec != 0) { /* writer wrote something */
 211                         if (s->server_stream_start.tv_sec == 0) {
 212                                 /* copy status info to slot */
 213                                 s->server_stream_start = stat_task->server_stream_start;
 214                                 s->offset_seconds = stat_task->offset_seconds;
 215                                 s->seconds_total = stat_task->length_seconds;
 216                         }
 217                         length = s->seconds_total;
 218                         tmp = &s->server_stream_start;
 219                 }
 220         }
 221         if (stat_task->sa_time_diff_sign > 0)
 222                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 223         else
 224                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 225         if (!s || !s->wns) {
 226                 struct timeval diff;
 227                 tv_diff(now, &sss, &diff);
 228                 seconds = diff.tv_sec + stat_task->offset_seconds;
 229                 goto out;
 230         }
 231         tv_diff(now, &wstime, &wtime);
 232         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 233         seconds = s->offset_seconds;
 234         btr_get_node_start(s->receiver_node->btrn, &rstime);
 235         ret = tv_diff(&rstime, &sss, &rskip);
 236         if (ret > 0) { /* audiod was started in the middle of the stream */
 237                 tv_add(&wtime, &rskip, &sum);
 238                 seconds += sum.tv_sec;
 239         } else
 240                 seconds += wtime.tv_sec;
 241 out:
 242         seconds = PARA_MIN(seconds, length);
 243         seconds = PARA_MAX(seconds, 0);
 244         msg = make_message(
 245                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 246                 s? "" : "~",
 247                 seconds / 60,
 248                 seconds % 60,
 249                 (length - seconds) / 60,
 250                 (length - seconds) % 60,
 251                 length? (seconds * 100 + length / 2) / length : 0,
 252                 length / 60,
 253                 length % 60
 254         );
 255         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 256         return msg;
 257 empty:
 258         return para_strdup(NULL);
 259 }
 260
 261 static int want_colors(void)
 262 {
 263         if (conf.color_arg == color_arg_no)
 264                 return 0;
 265         if (conf.color_arg == color_arg_yes)
 266                 return 1;
 267         if (conf.logfile_given)
 268                 return 0;
 269         return isatty(STDERR_FILENO);
 270 }
 271
 272 static void parse_config_or_die(void)
 273 {
 274         int ret;
 275         char *config_file;
 276         struct audiod_cmdline_parser_params params = {
 277                 .override = 0,
 278                 .initialize = 0,
 279                 .check_required = 1,
 280                 .check_ambiguity = 0,
 281                 .print_errors = 1
 282         };
 283
 284         if (conf.config_file_given)
 285                 config_file = para_strdup(conf.config_file_arg);
 286         else {
 287                 char *home = para_homedir();
 288                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 289                 free(home);
 290         }
 291         ret = file_exists(config_file);
 292         if (conf.config_file_given && !ret) {
 293                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 294                 goto err;
 295         }
 296         if (ret)
 297                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 298         free(config_file);
 299         daemon_set_loglevel(conf.loglevel_arg);
 300         return;
 301 err:
 302         free(config_file);
 303         exit(EXIT_FAILURE);
 304 }
 305
 306 static void setup_signal_handling(void)
 307 {
 308         sig_task->fd = para_signal_init();
 309         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 310         para_install_sighandler(SIGINT);
 311         para_install_sighandler(SIGTERM);
 312         para_install_sighandler(SIGHUP);
 313         para_sigaction(SIGPIPE, SIG_IGN);
 314 }
 315
 316 static void clear_slot(int slot_num)
 317 {
 318         struct slot_info *s = &slot[slot_num];
 319
 320         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 321         memset(s, 0, sizeof(struct slot_info));
 322         s->format = -1;
 323 }
 324
 325 static void close_receiver(int slot_num)
 326 {
 327         struct slot_info *s = &slot[slot_num];
 328         struct audio_format_info *a;
 329         struct timeval restart_delay = {0, 200 * 1000};
 330
 331         if (s->format < 0 || !s->receiver_node)
 332                 return;
 333         a = &afi[s->format];
 334         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 335                 audio_formats[s->format], slot_num);
 336         a->receiver->close(s->receiver_node);
 337         btr_free_node(s->receiver_node->btrn);
 338         free(s->receiver_node);
 339         s->receiver_node = NULL;
 340         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 341 }
 342
 343 static void writer_cleanup(struct writer_node *wn)
 344 {
 345         struct writer *w;
 346
 347         if (!wn)
 348                 return;
 349         w = writers + wn->writer_num;
 350         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 351         w->close(wn);
 352         btr_free_node(wn->btrn);
 353 }
 354
 355 static void close_writers(struct slot_info *s)
 356 {
 357         struct audio_format_info *a;
 358         int i;
 359
 360         if (s->format < 0)
 361                 return;
 362         assert(s->wns);
 363         a = afi + s->format;
 364         if (a->num_writers == 0)
 365                 writer_cleanup(s->wns);
 366         else {
 367                 for (i = 0; i < a->num_writers; i++)
 368                         writer_cleanup(s->wns + i);
 369         }
 370         free(s->wns);
 371         s->wns = NULL;
 372 }
 373
 374 static void close_filters(struct slot_info *s)
 375 {
 376         int i;
 377         struct audio_format_info *a = afi + s->format;
 378         if (a->num_filters == 0)
 379                 return;
 380         for (i = 0; i < a->num_filters; i++) {
 381                 struct filter_node *fn = s->fns + i;
 382                 struct filter *f;
 383
 384                 if (!fn)
 385                         continue;
 386                 f = filters + fn->filter_num;
 387                 if (f->close)
 388                         f->close(fn);
 389                 btr_free_node(fn->btrn);
 390         }
 391         free(s->fns);
 392         s->fns = NULL;
 393 }
 394
 395 /*
 396  * Whenever a task commits suicide by returning from post_select with t->error
 397  * < 0, it also removes its btr node. We do exactly that to kill a running
 398  * task. Note that the scheduler checks t->error also _before_ each pre/post
 399  * select call, so the victim will never be scheduled again.
 400  */
 401 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
 402 {
 403         if (t->error < 0)
 404                 return;
 405         t->error = error;
 406         btr_remove_node(btrn);
 407 }
 408
 409 static void kill_all_decoders(int error)
 410 {
 411         int i, j;
 412
 413         FOR_EACH_SLOT(i) {
 414                 struct slot_info *s = &slot[i];
 415                 struct audio_format_info *a;
 416                 if (s->format < 0)
 417                         continue;
 418                 a = afi + s->format;
 419                 if (s->wns)
 420                         for (j = 0; j < a->num_writers; j++)
 421                                 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
 422                 if (s->fns)
 423                         for (j = 0; j < a->num_writers; j++)
 424                                 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
 425                 if (s->receiver_node)
 426                         kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
 427                                 error);
 428         }
 429 }
 430
 431 static int get_empty_slot(void)
 432 {
 433         int i;
 434         struct slot_info *s;
 435
 436         FOR_EACH_SLOT(i) {
 437                 s = &slot[i];
 438                 if (s->format < 0) {
 439                         clear_slot(i);
 440                         return i;
 441                 }
 442                 if (s->wns || s->receiver_node || s->fns)
 443                         continue;
 444                 clear_slot(i);
 445                 return i;
 446         }
 447         return -E_NO_MORE_SLOTS;
 448 }
 449
 450 /**
 451  * get the number of filters
 452  *
 453  * \param audio_format_num the number identifying the audio format
 454  *
 455  * \return the number of filters for the given audio format
 456  *
 457  * \sa struct filter;
 458  */
 459 int num_filters(int audio_format_num)
 460 {
 461         return afi[audio_format_num].num_filters;
 462 }
 463
 464 static void open_filters(struct slot_info *s)
 465 {
 466         struct audio_format_info *a = afi + s->format;
 467         struct filter_node *fn;
 468         int nf = a->num_filters;
 469         struct btr_node *parent;
 470         int i;
 471
 472         if (nf == 0)
 473                 return;
 474         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 475         assert(s->fns == NULL);
 476         s->fns = para_calloc(nf * sizeof(struct filter_node));
 477         parent = s->receiver_node->btrn;
 478         for (i = 0; i < nf; i++) {
 479                 struct filter *f = filters + a->filter_nums[i];
 480                 fn = s->fns + i;
 481                 fn->filter_num = a->filter_nums[i];
 482                 fn->conf = a->filter_conf[i];
 483                 fn->task.pre_select = f->pre_select;
 484                 fn->task.post_select = f->post_select;
 485
 486                 fn->btrn = btr_new_node(&(struct btr_node_description)
 487                         EMBRACE(.name = f->name, .parent = parent,
 488                                 .handler = f->execute, .context = fn));
 489
 490                 f->open(fn);
 491                 register_task(&fn->task);
 492                 parent = fn->btrn;
 493                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 494                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 495                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
 496         }
 497 }
 498
 499 static void open_writers(struct slot_info *s)
 500 {
 501         int i;
 502         struct audio_format_info *a = afi + s->format;
 503         struct writer_node *wn;
 504         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 505
 506         assert(s->wns == NULL);
 507         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 508                 * sizeof(struct writer_node));
 509         if (a->num_writers == 0)
 510                 setup_writer_node(NULL, parent, s->wns);
 511         else {
 512                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 513                 for (i = 0; i < a->num_writers; i++) {
 514                         wn = s->wns + i;
 515                         wn->conf = a->writer_conf[i];
 516                         wn->writer_num = a->writer_nums[i];
 517                         register_writer_node(wn, parent);
 518                 }
 519         }
 520 }
 521
 522 /* returns slot num on success */
 523 static int open_receiver(int format)
 524 {
 525         struct audio_format_info *a = &afi[format];
 526         struct slot_info *s;
 527         int ret, slot_num;
 528         struct receiver *r = a->receiver;
 529         struct receiver_node *rn;
 530         const struct timeval restart_delay = {2, 0};
 531
 532         ret = get_empty_slot();
 533         if (ret < 0)
 534                 goto err;
 535         slot_num = ret;
 536         s = &slot[slot_num];
 537         s->format = format;
 538         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 539         rn = s->receiver_node;
 540         rn->receiver = r;
 541         rn->conf = a->receiver_conf;
 542         rn->btrn = btr_new_node(&(struct btr_node_description)
 543                 EMBRACE(.name = r->name, .context = rn));
 544         ret = r->open(rn);
 545         if (ret < 0) {
 546                 btr_free_node(rn->btrn);
 547                 free(rn);
 548                 s->receiver_node = NULL;
 549                 goto err;
 550         }
 551         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 552                 audio_formats[s->format], r->name, slot_num);
 553         rn->task.pre_select = r->pre_select;
 554         rn->task.post_select = r->post_select;
 555         sprintf(rn->task.status, "%s receiver node", r->name);
 556         register_task(&rn->task);
 557         ret = slot_num;
 558 err:
 559         if (ret < 0)
 560                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 561         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 562         return ret;
 563 }
 564
 565 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 566 static int receiver_running(int format)
 567 {
 568         int i, ret = 0;
 569
 570         FOR_EACH_SLOT(i) {
 571                 struct slot_info *s = &slot[i];
 572                 if (s->format != format)
 573                         continue;
 574                 if (!s->receiver_node)
 575                         continue;
 576                 if (s->receiver_node->task.error >= 0)
 577                         return 1;
 578                 ret = -1;
 579         }
 580         return ret;
 581 }
 582
 583 struct btr_node *audiod_get_btr_root(void)
 584 {
 585         int i, newest_slot = -1;
 586         struct timeval newest_rstime = {0, 0};
 587
 588         FOR_EACH_SLOT(i) {
 589                 struct slot_info *s = &slot[i];
 590                 struct timeval rstime;
 591                 if (!s->receiver_node)
 592                         continue;
 593                 if (s->receiver_node->task.error < 0)
 594                         continue;
 595                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 596                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 597                         continue;
 598                 newest_rstime = rstime;
 599                 newest_slot = i;
 600         }
 601         if (newest_slot == -1)
 602                 return NULL;
 603         return slot[newest_slot].receiver_node->btrn;
 604 }
 605
 606 /* whether a new instance of a decoder should be started. */
 607 static bool must_start_decoder(void)
 608 {
 609         int ret, cafn = stat_task->current_audio_format_num;
 610
 611         if (cafn < 0 || !stat_task->ct)
 612                 return false;
 613         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 614         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 615                 return false;
 616         ret = receiver_running(cafn);
 617         if (ret != 0) /* already running */
 618                 return false;
 619         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 620                 return false;
 621         return true;
 622 }
 623
 624 static unsigned compute_time_diff(const struct timeval *status_time)
 625 {
 626         struct timeval tmp, diff;
 627         static unsigned count;
 628         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 629         const struct timeval max_deviation = {0, 500 * 1000};
 630         const int time_smooth = 5;
 631
 632         if (!status_time)
 633                 return count;
 634         sign = tv_diff(status_time, now, &diff);
 635 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 636 //                      sign, sa_time_diff_sign);
 637         if (!count) {
 638                 sa_time_diff_sign = sign;
 639                 stat_task->sa_time_diff = diff;
 640                 count++;
 641                 goto out;
 642         }
 643         if (count > 5) {
 644                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 645                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 646                         PARA_WARNING_LOG("time diff jump: %lims\n",
 647                                 s * tv2ms(&tmp));
 648         }
 649         count++;
 650         sa_time_diff_sign = tv_convex_combination(
 651                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 652                 count > 10? sign : sign * time_smooth, &diff,
 653                 &tmp);
 654         stat_task->sa_time_diff = tmp;
 655         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 656                 sign < 0? "-" : "+",
 657                 tv2ms(&diff),
 658                 sa_time_diff_sign < 0? "-" : "+",
 659                 tv2ms(&stat_task->sa_time_diff)
 660         );
 661 out:
 662         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 663         return count;
 664 }
 665
 666 static int update_item(int itemnum, char *buf)
 667 {
 668         long unsigned sec, usec;
 669
 670         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 671                 return 1;
 672         free(stat_item_values[itemnum]);
 673         stat_item_values[itemnum] = para_strdup(buf);
 674         stat_client_write_item(itemnum);
 675         switch (itemnum) {
 676         case SI_STATUS_FLAGS:
 677                 stat_task->vss_status = 0;
 678                 if (strchr(buf, 'N'))
 679                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 680                 if (strchr(buf, 'P'))
 681                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 682                 break;
 683         case SI_OFFSET:
 684                 stat_task->offset_seconds = atoi(buf);
 685                 break;
 686         case SI_SECONDS_TOTAL:
 687                 stat_task->length_seconds = atoi(buf);
 688                 break;
 689         case SI_STREAM_START:
 690                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 691                         struct timeval a_start, delay;
 692                         delay.tv_sec = conf.stream_delay_arg / 1000;
 693                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 694                         stat_task->server_stream_start.tv_sec = sec;
 695                         stat_task->server_stream_start.tv_usec = usec;
 696                         if (compute_time_diff(NULL) > 2) {
 697                                 if (stat_task->sa_time_diff_sign < 0)
 698                                         tv_add(&stat_task->server_stream_start,
 699                                                 &stat_task->sa_time_diff, &a_start);
 700                                 else
 701                                         tv_diff(&stat_task->server_stream_start,
 702                                                 &stat_task->sa_time_diff, &a_start);
 703                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 704                         }
 705                 }
 706                 break;
 707         case SI_CURRENT_TIME:
 708                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 709                         struct timeval tv = {sec, usec};
 710                         compute_time_diff(&tv);
 711                 }
 712                 break;
 713         case SI_FORMAT:
 714                 stat_task->current_audio_format_num
 715                         = get_audio_format_num(buf);
 716         }
 717         return 1;
 718 }
 719
 720 static int parse_stream_command(const char *txt, char **cmd)
 721 {
 722         char *p = strchr(txt, ':');
 723         int i;
 724
 725         if (!p)
 726                 return -E_MISSING_COLON;
 727         p++;
 728         FOR_EACH_AUDIO_FORMAT(i) {
 729                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 730                         continue;
 731                 *cmd = p;
 732                 return i;
 733         }
 734         return -E_UNSUPPORTED_AUDIO_FORMAT;
 735 }
 736
 737 static int add_filter(int format, char *cmdline)
 738 {
 739         struct audio_format_info *a = &afi[format];
 740         int filter_num, nf = a->num_filters;
 741
 742         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 743         if (filter_num < 0)
 744                 return filter_num;
 745         a->filter_nums[nf] = filter_num;
 746         a->num_filters++;
 747         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 748                 filters[filter_num].name);
 749         return filter_num;
 750 }
 751
 752 static int parse_writer_args(void)
 753 {
 754         int i, ret, nw;
 755         char *cmd;
 756         struct audio_format_info *a;
 757
 758         nw = PARA_MAX(1U, conf.writer_given);
 759         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 760         FOR_EACH_AUDIO_FORMAT(i) {
 761                 a = &afi[i];
 762                 a->writer_conf = para_malloc(nw * sizeof(void *));
 763                 a->writer_nums = para_malloc(nw * sizeof(int));
 764                 a->num_writers = 0;
 765         }
 766         for (i = 0; i < conf.writer_given; i++) {
 767                 void *wconf;
 768                 int writer_num;
 769                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 770                 if (ret < 0)
 771                         goto out;
 772                 a = &afi[ret];
 773                 nw = a->num_writers;
 774                 wconf = check_writer_arg(cmd, &writer_num);
 775                 if (!wconf) {
 776                         ret = writer_num;
 777                         goto out;
 778                 }
 779                 a->writer_nums[nw] = writer_num;
 780                 a->writer_conf[nw] = wconf;
 781                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 782                         nw, writer_names[writer_num]);
 783                 a->num_writers++;
 784         }
 785         ret = 1;
 786 out:
 787         return ret;
 788 }
 789
 790 static int parse_receiver_args(void)
 791 {
 792         int i, ret, receiver_num;
 793         char *cmd = NULL;
 794         struct audio_format_info *a;
 795
 796         for (i = conf.receiver_given - 1; i >= 0; i--) {
 797                 char *arg = conf.receiver_arg[i];
 798                 char *recv_arg = strchr(arg, ':');
 799                 ret = -E_MISSING_COLON;
 800                 if (!recv_arg)
 801                         goto out;
 802                 *recv_arg = '\0';
 803                 recv_arg++;
 804                 ret = get_audio_format_num(arg);
 805                 if (ret < 0)
 806                         goto out;
 807                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 808                 if (!afi[ret].receiver_conf) {
 809                         ret = -E_RECV_SYNTAX;
 810                         goto out;
 811                 }
 812                 afi[ret].receiver = &receivers[receiver_num];
 813         }
 814         /* use the first available receiver with no arguments
 815          * for those audio formats for which no receiver
 816          * was specified
 817          */
 818         cmd = para_strdup(receivers[0].name);
 819         FOR_EACH_AUDIO_FORMAT(i) {
 820                 a = &afi[i];
 821                 if (a->receiver_conf)
 822                         continue;
 823                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 824                 if (!a->receiver_conf)
 825                         return -E_RECV_SYNTAX;
 826                 a->receiver = &receivers[receiver_num];
 827         }
 828         ret = 1;
 829 out:
 830         free(cmd);
 831         return ret;
 832 }
 833
 834 static int init_default_filters(void)
 835 {
 836         int i, ret = 1;
 837
 838         FOR_EACH_AUDIO_FORMAT(i) {
 839                 struct audio_format_info *a = &afi[i];
 840                 char *tmp;
 841                 int j;
 842
 843                 if (a->num_filters)
 844                         continue; /* no default -- nothing to to */
 845                 /* add "dec" to audio format name */
 846                 tmp = make_message("%sdec", audio_formats[i]);
 847                 for (j = 0; filters[j].name; j++)
 848                         if (!strcmp(tmp, filters[j].name))
 849                                 break;
 850                 free(tmp);
 851                 ret = -E_UNSUPPORTED_FILTER;
 852                 if (!filters[j].name)
 853                         goto out;
 854                 tmp = para_strdup(filters[j].name);
 855                 ret = add_filter(i, tmp);
 856                 free(tmp);
 857                 if (ret < 0)
 858                         goto out;
 859                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 860                         filters[j].name);
 861         }
 862 out:
 863         return ret;
 864 }
 865
 866 static int parse_filter_args(void)
 867 {
 868         int i, ret, nf;
 869
 870         nf = PARA_MAX(1U, conf.filter_given);
 871         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 872         FOR_EACH_AUDIO_FORMAT(i) {
 873                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 874                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 875         }
 876         if (!conf.no_default_filters_given)
 877                 return init_default_filters();
 878         for (i = 0; i < conf.filter_given; i++) {
 879                 char *arg = conf.filter_arg[i];
 880                 char *filter_name = strchr(arg, ':');
 881                 ret = -E_MISSING_COLON;
 882                 if (!filter_name)
 883                         goto out;
 884                 *filter_name = '\0';
 885                 filter_name++;
 886                 ret = get_audio_format_num(arg);
 887                 if (ret < 0)
 888                         goto out;
 889                 ret = add_filter(ret, filter_name);
 890                 if (ret < 0)
 891                         goto out;
 892         }
 893         ret = init_default_filters(); /* use default values for the rest */
 894 out:
 895         return ret;
 896 }
 897
 898 static int parse_stream_args(void)
 899 {
 900         int ret;
 901
 902         ret = parse_receiver_args();
 903         if (ret < 0)
 904                 return ret;
 905         ret = parse_filter_args();
 906         if (ret < 0)
 907                 return ret;
 908         ret = parse_writer_args();
 909         if (ret < 0)
 910                 return ret;
 911         return 1;
 912 }
 913
 914 /* does not unlink socket on errors */
 915 static int audiod_get_socket(void)
 916 {
 917         struct sockaddr_un unix_addr;
 918         int ret, fd;
 919
 920         if (conf.socket_given)
 921                 socket_name = para_strdup(conf.socket_arg);
 922         else {
 923                 char *hn = para_hostname();
 924                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 925                         hn);
 926                 free(hn);
 927         }
 928         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 929         if (conf.force_given)
 930                 unlink(socket_name);
 931         ret = create_local_socket(socket_name, &unix_addr,
 932                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 933         if (ret < 0)
 934                 goto err;
 935         fd = ret;
 936         if (listen(fd , 5) < 0) {
 937                 ret = -ERRNO_TO_PARA_ERROR(errno);
 938                 goto err;
 939         }
 940         ret = mark_fd_nonblocking(fd);
 941         if (ret < 0)
 942                 goto err;
 943         return fd;
 944 err:
 945         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 946         exit(EXIT_FAILURE);
 947 }
 948
 949 static void signal_pre_select(struct sched *s, struct task *t)
 950 {
 951         struct signal_task *st = container_of(t, struct signal_task, task);
 952         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 953 }
 954
 955 static void signal_post_select(struct sched *s, struct task *t)
 956 {
 957         struct signal_task *st = container_of(t, struct signal_task, task);
 958
 959         if (!FD_ISSET(st->fd, &s->rfds))
 960                 return;
 961
 962         st->signum = para_next_signal();
 963         switch (st->signum) {
 964         case SIGINT:
 965         case SIGTERM:
 966         case SIGHUP:
 967                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 968                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 969         }
 970 }
 971
 972 static void signal_setup_default(struct signal_task *st)
 973 {
 974         st->task.pre_select = signal_pre_select;
 975         st->task.post_select = signal_post_select;
 976         sprintf(st->task.status, "signal task");
 977 }
 978
 979 static void command_pre_select(struct sched *s, struct task *t)
 980 {
 981         struct command_task *ct = container_of(t, struct command_task, task);
 982         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 983 }
 984
 985 static void command_post_select(struct sched *s, struct task *t)
 986 {
 987         int ret;
 988         struct command_task *ct = container_of(t, struct command_task, task);
 989         static struct timeval last_status_dump;
 990         struct timeval tmp, delay = {0, 500 * 1000};
 991
 992         tv_add(&last_status_dump, &delay, &tmp);
 993         if (tv_diff(&tmp, now, NULL) < 0) {
 994                 audiod_status_dump();
 995                 last_status_dump = *now;
 996         }
 997
 998         if (!FD_ISSET(ct->fd, &s->rfds))
 999                 return;
1000         ret = handle_connect(ct->fd);
1001         if (ret < 0)
1002                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1003 }
1004
1005 static void init_command_task(struct command_task *ct)
1006 {
1007         ct->task.pre_select = command_pre_select;
1008         ct->task.post_select = command_post_select;
1009         ct->task.error = 0;
1010         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1011         sprintf(ct->task.status, "command task");
1012 }
1013
1014 static void close_stat_pipe(void)
1015 {
1016         if (!stat_task->ct)
1017                 return;
1018         btr_free_node(stat_task->ct->btrn);
1019         client_close(stat_task->ct);
1020         stat_task->ct = NULL;
1021         clear_and_dump_items();
1022         stat_task->length_seconds = 0;
1023         stat_task->offset_seconds = 0;
1024         stat_task->vss_status = 0;
1025         stat_task->current_audio_format_num = -1;
1026         audiod_status_dump();
1027 }
1028
1029 /**
1030  * close the connection to para_server and exit
1031  *
1032  * \param status the exit status which is passed to exit(3)
1033  * \param msg the log message
1034  *
1035  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1036  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1037  * EXIT_FAILURE.
1038  *
1039  * \sa exit(3)
1040  */
1041 void __noreturn clean_exit(int status, const char *msg)
1042 {
1043         PARA_EMERG_LOG("%s\n", msg);
1044         if (socket_name)
1045                 unlink(socket_name);
1046         close_stat_pipe();
1047         exit(status);
1048 }
1049
1050 /* avoid busy loop if server is down */
1051 static void set_stat_task_restart_barrier(unsigned seconds)
1052 {
1053         struct timeval delay = {seconds, 0};
1054         tv_add(now, &delay, &stat_task->restart_barrier);
1055 }
1056
1057 static void try_to_close_slot(int slot_num)
1058 {
1059         struct slot_info *s = &slot[slot_num];
1060         struct audio_format_info *a = afi + s->format;
1061         int i;
1062
1063         if (s->format < 0)
1064                 return;
1065         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1066                 return;
1067         for (i = 0; i < a->num_filters; i++)
1068                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1069                         return;
1070         if (a->num_writers > 0) {
1071                 for (i = 0; i < a->num_writers; i++)
1072                         if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1073                                 return;
1074         } else {
1075                 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1076                         return;
1077         }
1078         PARA_INFO_LOG("closing slot %d\n", slot_num);
1079         close_writers(s);
1080         close_filters(s);
1081         close_receiver(slot_num);
1082         clear_slot(slot_num);
1083 }
1084
1085 /*
1086  * Check if any receivers/filters/writers need to be started and do so if
1087  * necessary.
1088  */
1089 static void start_stop_decoders(void)
1090 {
1091         int i, ret;
1092         struct slot_info *sl;
1093         struct audio_format_info *a;
1094
1095         FOR_EACH_SLOT(i)
1096                 try_to_close_slot(i);
1097         if (audiod_status != AUDIOD_ON ||
1098                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1099                 return kill_all_decoders(-E_NOT_PLAYING);
1100         if (!must_start_decoder())
1101                 return;
1102         ret = open_receiver(stat_task->current_audio_format_num);
1103         if (ret < 0)
1104                 return;
1105         sl = slot + ret;
1106         a = afi + sl->format;
1107         if (a->num_filters)
1108                 open_filters(sl);
1109         open_writers(sl);
1110         activate_grab_clients();
1111         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1112 }
1113
1114 static void status_pre_select(struct sched *s, struct task *t)
1115 {
1116         struct status_task *st = container_of(t, struct status_task, task);
1117         int ret, cafn = stat_task->current_audio_format_num;
1118
1119         if (must_start_decoder())
1120                 goto min_delay;
1121         ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1122         if (ret > 0)
1123                 goto min_delay;
1124         if (!st->ct)
1125                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1126         if (cafn >= 0)
1127                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1128         return;
1129 min_delay:
1130         sched_min_delay(s);
1131 }
1132
1133 /* restart the client task if necessary */
1134 static void status_post_select(__a_unused struct sched *s, struct task *t)
1135 {
1136         struct status_task *st = container_of(t, struct status_task, task);
1137
1138         if (audiod_status == AUDIOD_OFF) {
1139                 if (!st->ct)
1140                         goto out;
1141                 if (st->ct->task.error >= 0) {
1142                         kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1143                         goto out;
1144                 }
1145                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1146                         goto out;
1147                 close_stat_pipe();
1148                 st->clock_diff_count = conf.clock_diff_count_arg;
1149                 goto out;
1150         }
1151         if (st->ct) {
1152                 char *buf;
1153                 size_t sz;
1154                 int ret;
1155                 if (st->ct->task.error < 0) {
1156                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1157                                 goto out;
1158                         close_stat_pipe();
1159                         goto out;
1160                 }
1161                 if (st->ct->status != CL_RECEIVING)
1162                         goto out;
1163                 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1164                 if (ret <= 0)
1165                         goto out;
1166                 sz = btr_next_buffer(st->btrn, &buf);
1167                 ret = for_each_stat_item(buf, sz, update_item);
1168                 if (ret < 0) {
1169                         kill_btrn(st->ct->btrn, &st->ct->task, ret);
1170                         goto out;
1171                 }
1172                 if (sz != ret)
1173                         st->last_status_read = *now;
1174                 else {
1175                         struct timeval diff;
1176                         tv_diff(now, &st->last_status_read, &diff);
1177                         if (diff.tv_sec > 61)
1178                                 kill_btrn(st->ct->btrn, &st->ct->task,
1179                                         -E_STATUS_TIMEOUT);
1180                 }
1181                 btr_consume(st->btrn, sz - ret);
1182                 goto out;
1183         }
1184         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1185                 goto out;
1186         if (st->clock_diff_count) { /* get status only one time */
1187                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1188                 int argc = 5;
1189                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1190                 st->clock_diff_count--;
1191                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1192                 set_stat_task_restart_barrier(2);
1193
1194         } else {
1195                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1196                 int argc = 4;
1197                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1198                 set_stat_task_restart_barrier(5);
1199         }
1200         free(stat_item_values[SI_BASENAME]);
1201         stat_item_values[SI_BASENAME] = para_strdup(
1202                 "no connection to para_server");
1203         stat_client_write_item(SI_BASENAME);
1204         st->last_status_read = *now;
1205 out:
1206         start_stop_decoders();
1207 }
1208
1209 static void init_status_task(struct status_task *st)
1210 {
1211         memset(st, 0, sizeof(struct status_task));
1212         st->task.pre_select = status_pre_select;
1213         st->task.post_select = status_post_select;
1214         st->sa_time_diff_sign = 1;
1215         st->clock_diff_count = conf.clock_diff_count_arg;
1216         st->current_audio_format_num = -1;
1217         sprintf(st->task.status, "stat");
1218         st->btrn = btr_new_node(&(struct btr_node_description)
1219                 EMBRACE(.name = "stat"));
1220 }
1221
1222 static void set_initial_status(void)
1223 {
1224         audiod_status = AUDIOD_ON;
1225         if (!conf.mode_given)
1226                 return;
1227         if (!strcmp(conf.mode_arg, "sb")) {
1228                 audiod_status = AUDIOD_STANDBY;
1229                 return;
1230         }
1231         if (!strcmp(conf.mode_arg, "off")) {
1232                 audiod_status = AUDIOD_OFF;
1233                 return;
1234         }
1235         if (strcmp(conf.mode_arg, "on"))
1236                 PARA_WARNING_LOG("invalid mode\n");
1237 }
1238
1239 __noreturn static void print_help_and_die(void)
1240 {
1241         int d = conf.detailed_help_given;
1242         const char **p = d? audiod_args_info_detailed_help
1243                 : audiod_args_info_help;
1244
1245         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1246                 AUDIOD_CMDLINE_PARSER_VERSION);
1247         printf_or_die("%s\n\n", audiod_args_info_usage);
1248         for (; *p; p++)
1249                 printf_or_die("%s\n", *p);
1250         print_receiver_helps(d);
1251         print_filter_helps(d);
1252         print_writer_helps(d);
1253         exit(0);
1254 }
1255
1256 static void init_colors_or_die(void)
1257 {
1258         int ret, i;
1259
1260         if (!want_colors())
1261                 return;
1262         daemon_set_default_log_colors();
1263         daemon_set_flag(DF_COLOR_LOG);
1264         for (i = 0; i < conf.log_color_given; i++) {
1265                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1266                 if (ret < 0)
1267                         exit(EXIT_FAILURE);
1268         }
1269 }
1270
1271 /**
1272  * the main function of para_audiod
1273  *
1274  * \param argc usual argument count
1275  * \param argv usual argument vector
1276  *
1277  * \return EXIT_SUCCESS or EXIT_FAILURE
1278  *
1279  * \sa para_audiod(1)
1280  * */
1281 int main(int argc, char *argv[])
1282 {
1283         int ret, i;
1284         static struct sched s;
1285         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1286         struct audiod_cmdline_parser_params params = {
1287                 .override = 0,
1288                 .initialize = 1,
1289                 .check_required = 0,
1290                 .check_ambiguity = 0,
1291                 .print_errors = 1
1292         };
1293
1294         valid_fd_012();
1295         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1296                 exit(EXIT_FAILURE);
1297         HANDLE_VERSION_FLAG("audiod", conf);
1298         /* init receivers/filters/writers early to make help work */
1299         recv_init();
1300         filter_init();
1301         writer_init();
1302         if (conf.help_given || conf.detailed_help_given)
1303                 print_help_and_die();
1304         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1305         parse_config_or_die();
1306         init_colors_or_die();
1307         init_random_seed_or_die();
1308         daemon_set_flag(DF_LOG_TIME);
1309         daemon_set_flag(DF_LOG_HOSTNAME);
1310         daemon_set_flag(DF_LOG_LL);
1311         if (conf.log_timing_given)
1312                 daemon_set_flag(DF_LOG_TIMING);
1313         if (conf.logfile_given) {
1314                 daemon_set_logfile(conf.logfile_arg);
1315                 daemon_open_log_or_die();
1316         }
1317         ret = parse_stream_args();
1318         if (ret < 0) {
1319                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1320                 exit(EXIT_FAILURE);
1321         }
1322         log_welcome("para_audiod");
1323         server_uptime(UPTIME_SET);
1324         set_initial_status();
1325         FOR_EACH_SLOT(i)
1326                 clear_slot(i);
1327         setup_signal_handling();
1328         signal_setup_default(sig_task);
1329
1330         init_status_task(stat_task);
1331         init_command_task(cmd_task);
1332
1333         if (conf.daemon_given)
1334                 daemonize();
1335
1336         register_task(&sig_task->task);
1337         register_task(&cmd_task->task);
1338         register_task(&stat_task->task);
1339         s.default_timeout.tv_sec = 2;
1340         s.default_timeout.tv_usec = 999 * 1000;
1341         ret = schedule(&s);
1342
1343         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1344         return EXIT_FAILURE;
1345 }