audiod.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file audiod.c the paraslash's audio daemon */
  20
  21 #include "para.h"
  22
  23 #include "audiod.cmdline.h"
  24 #include "list.h"
  25 #include "close_on_fork.h"
  26 #include "sched.h"
  27 #include "recv.h"
  28 #include "filter.h"
  29 #include "grab_client.cmdline.h"
  30 #include "grab_client.h"
  31
  32 #include "error.h"
  33 #include "audiod.h"
  34 #include "net.h"
  35 #include "daemon.h"
  36 #include "string.h"
  37 #include "fd.h"
  38 #include "write.h"
  39 #include "write_common.h"
  40
  41 /** define the array of error lists needed by para_audiod */
  42 INIT_AUDIOD_ERRLISTS;
  43 /** define the array containing all supported audio formats */
  44 DEFINE_AUDIO_FORMAT_ARRAY;
  45
  46 /**
  47  * the possible modes of operation
  48  *
  49  * - off: disconnect from para_server
  50  * - on: receive status information from para_server and play the audio stream
  51  * - sb: only receive status information but not the audio stream
  52 */
  53 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  54
  55 /** defines how to handle one supported audio format */
  56 struct audio_format_info {
  57         /** pointer to the receiver for this audio format */
  58         struct receiver *receiver;
  59         /** the receiver configuration */
  60         void *receiver_conf;
  61         /** the number of filters that should be activated for this audio format */
  62         unsigned int num_filters;
  63         /** pointer to the array of filters to be activated */
  64         struct filter **filters;
  65         /** pointer to the array of filter configurations */
  66         void **filter_conf;
  67         /** the number of filters that should be activated for this audio format */
  68         unsigned int num_writers;
  69         /** pointer to the array of writers to be activated */
  70         struct writer **writers;
  71         /** pointer to the array of writer configurations */
  72         void **writer_conf;
  73         /** do not start receiver/filters/writer before this time */
  74         struct timeval restart_barrier;
  75 };
  76
  77 /**
  78  * describes one instance of a receiver-filter-writer chain
  79  *
  80  * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
  81  * writer_node, writer_node_group.
  82   */
  83 struct slot_info {
  84         /** number of the audio format in this slot */
  85         int format;
  86         /** writer start time */
  87         struct timeval wstime;
  88         /** the receiver info associated with this slot */
  89         struct receiver_node *receiver_node;
  90         /** the active filter chain */
  91         struct filter_chain *fc;
  92         /** the active writer node group */
  93         struct writer_node_group *wng;
  94 };
  95 static struct slot_info slot[MAX_STREAM_SLOTS];
  96
  97 extern const char *status_item_list[NUM_STAT_ITEMS];
  98
  99 static struct gengetopt_args_info conf;
 100 static struct timeval server_stream_start, sa_time_diff;
 101 static int playing, current_decoder = -1,
 102         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 103         sa_time_diff_sign = 1;
 104 static char *af_status, /* the audio format announced in server status */
 105         *socket_name, *hostname;
 106 static char *stat_item_values[NUM_STAT_ITEMS];
 107 static FILE *logfile;
 108 static const struct timeval restart_delay = {0, 300 * 1000};
 109 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 110 static struct timeval *now;
 111
 112 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 113
 114 /**
 115  * the task for handling audiod commands
 116  *
 117  * \sa struct task, struct sched
 118  */
 119 struct command_task {
 120         /** the local listening socket */
 121         int fd;
 122         /** the associated task structure */
 123         struct task task;
 124 };
 125
 126 /**
 127  * the task for audiod's child (para_client stat)
 128  *
 129  * \sa struct task, struct sched
 130  */
 131 struct status_task {
 132         /** the output of the stat command is read from this fd */
 133         int fd;
 134         /** stat data is stored here */
 135         char buf[STRINGSIZE];
 136         /** number of bytes loaded in \a buf */
 137         unsigned loaded;
 138         /** the associated task structure */
 139         struct task task;
 140 };
 141 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 142
 143 struct signal_task {
 144         int fd;
 145         int signum;
 146         struct task task;
 147 };
 148
 149 /** defines one command of para_audiod */
 150 struct audiod_command {
 151         /** the name of the command */
 152         const char *name;
 153         /** pointer to the function that handles the command */
 154         int (*handler)(int, int, char**);
 155         /**
 156          * if the command prefers to handle the full line (rather than the usual
 157          * argv[] array), it stores a pointer to the corresponding line handling
 158          * function here. In this case, the above \a handler pointer must be NULL.
 159          */
 160         int (*line_handler)(int, char*);
 161         /** one-line description of the command */
 162         const char *description;
 163         /** summary of the command line options */
 164         const char *synopsis;
 165         /** the long help text */
 166         const char *help;
 167 };
 168 static int com_grab(int, char *);
 169 static int com_cycle(int, int, char **);
 170 static int com_help(int, int, char **);
 171 static int com_off(int, int, char **);
 172 static int com_on(int, int, char **);
 173 static int com_sb(int, int, char **);
 174 static int com_stat(int, int, char **);
 175 static int com_term(int, int, char **);
 176 static struct audiod_command cmds[] = {
 177 {
 178 .name = "cycle",
 179 .handler = com_cycle,
 180 .description = "switch to next mode",
 181 .synopsis = "cycle",
 182 .help =
 183
 184 "on -> standby -> off -> on\n"
 185
 186 },
 187 {
 188 .name = "grab",
 189 .line_handler = com_grab,
 190 .description = "grab the audio stream",
 191 .synopsis = "-- grab [grab_options]",
 192 .help =
 193
 194 "grab ('splice') the audio stream at any position in the filter      \n"
 195 "chain and send that data back to the client. Try\n"
 196 "\t para_audioc -- grab -h\n"
 197 "for the list of available options.\n"
 198 },
 199
 200 {
 201 .name = "help",
 202 .handler = com_help,
 203 .description = "display command list or help for given command",
 204 .synopsis = "help [command]",
 205 .help =
 206
 207 "When I was younger, so much younger than today, I never needed\n"
 208 "anybody's help in any way. But now these days are gone, I'm not so\n"
 209 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 210 "\n"
 211 "                               -- Beatles: Help\n"
 212
 213 },
 214 {
 215 .name = "off",
 216 .handler = com_off,
 217 .description = "deactivate para_audiod",
 218 .synopsis = "off",
 219 .help =
 220
 221 "Close connection to para_server and stop all decoders.\n"
 222
 223 },
 224 {
 225 .name = "on",
 226 .handler = com_on,
 227 .description = "activate para_audiod",
 228 .synopsis = "on",
 229 .help =
 230
 231 "Establish connection to para_server, retrieve para_server's current\n"
 232 "status. If playing, start corresponding decoder. Otherwise stop\n"
 233 "all decoders.\n"
 234
 235 },
 236 {
 237 .name = "sb",
 238 .handler = com_sb,
 239 .description = "enter standby mode",
 240 .synopsis = "sb",
 241 .help =
 242
 243 "Stop all decoders but leave connection to para_server open.\n"
 244
 245 },
 246 {
 247 .name = "stat",
 248 .handler = com_stat,
 249 .description = "print status information",
 250 .synopsis = "stat [item1 ...]",
 251 .help =
 252
 253 "Dump given status items (all if none given) to stdout.\n"
 254
 255 },
 256 {
 257 .name = "term",
 258 .handler = com_term,
 259 .description = "terminate audiod",
 260 .synopsis = "term",
 261 .help =
 262
 263 "Stop all decoders, shut down connection to para_server and exit.\n"
 264
 265 },
 266 {
 267 .name = NULL,
 268 }
 269 };
 270
 271 /** iterate over all slots */
 272 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 273 /** iterate over all supported audio formats */
 274 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 275 /** iterate over the array of all audiod commands */
 276 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 277
 278 /**
 279  * get the audio format number
 280  * \param name the name of the audio format
 281  *
 282  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 283  * \a name is not a supported audio format.
 284  */
 285 int get_audio_format_num(char *name)
 286 {
 287         int i;
 288         FOR_EACH_AUDIO_FORMAT(i)
 289                 if (!strcmp(name, audio_formats[i]))
 290                         return i;
 291         return -E_UNSUPPORTED_AUDIO_FORMAT;
 292 }
 293
 294 /*
 295  * log function. first argument is loglevel.
 296  */
 297 void para_log(int ll, const char* fmt,...)
 298 {
 299         va_list argp;
 300         FILE *outfd;
 301         struct tm *tm;
 302         time_t t1;
 303         char str[MAXLINE] = "";
 304
 305         if (ll < conf.loglevel_arg)
 306                 return;
 307         outfd = logfile? logfile : stderr;
 308         time(&t1);
 309         tm = localtime(&t1);
 310         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 311         fprintf(outfd, "%s %s ", str, hostname);
 312         if (conf.loglevel_arg <= INFO)
 313                 fprintf(outfd, "%i ", ll);
 314         va_start(argp, fmt);
 315         vfprintf(outfd, fmt, argp);
 316         va_end(argp);
 317 }
 318
 319 static int client_write(int fd, const char *buf)
 320 {
 321         size_t len = strlen(buf);
 322         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 323 }
 324
 325 static char *get_time_string(struct timeval *newest_stime)
 326 {
 327         struct timeval diff, adj_stream_start, tmp;
 328         int total = 0, use_server_time = 1;
 329
 330         if (!playing) {
 331                 if (length_seconds)
 332                         return NULL;
 333                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 334         }
 335         if (audiod_status == AUDIOD_OFF)
 336                 goto out;
 337         if (sa_time_diff_sign > 0)
 338                 tv_diff(&server_stream_start, &sa_time_diff,
 339                         &adj_stream_start);
 340         else
 341                 tv_add(&server_stream_start, &sa_time_diff,
 342                         &adj_stream_start);
 343         tmp = adj_stream_start;
 344         if (newest_stime && audiod_status == AUDIOD_ON) {
 345                 tv_diff(newest_stime, &adj_stream_start, &diff);
 346                 if (tv2ms(&diff) < 5000) {
 347                         tmp = *newest_stime;
 348                         use_server_time = 0;
 349                 }
 350         }
 351         tv_diff(now, &tmp, &diff);
 352         total = diff.tv_sec + offset_seconds;
 353         if (total > length_seconds)
 354                 total = length_seconds;
 355         if (total < 0)
 356                 total = 0;
 357 out:
 358         return make_message(
 359                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 360                 status_item_list[SI_PLAY_TIME],
 361                 use_server_time? "~" : "",
 362                 total / 60,
 363                 total % 60,
 364                 (length_seconds - total) / 60,
 365                 (length_seconds - total) % 60,
 366                 length_seconds? (total * 100 + length_seconds / 2) /
 367                         length_seconds : 0,
 368                 length_seconds / 60,
 369                 length_seconds % 60
 370         );
 371 }
 372
 373 __malloc static char *audiod_status_string(void)
 374 {
 375         const char *status = (audiod_status == AUDIOD_ON)?
 376                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 377         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 378 }
 379
 380 static struct timeval *wstime(void)
 381 {
 382         int i;
 383         struct timeval *max = NULL;
 384         FOR_EACH_SLOT(i) {
 385                 struct slot_info *s = &slot[i];
 386                 if (!s->wng)
 387                         continue;
 388                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 389                         continue;
 390                 max = &s->wstime;
 391         }
 392         return max;
 393 }
 394 __malloc static char *decoder_flags(void)
 395 {
 396         int i;
 397         char decoder_flags[MAX_STREAM_SLOTS + 1];
 398
 399         FOR_EACH_SLOT(i) {
 400                 struct slot_info *s = &slot[i];
 401                 char flag = '0';
 402                 if (s->receiver_node)
 403                         flag += 1;
 404                 if (s->wng)
 405                         flag += 2;
 406                 decoder_flags[i] = flag;
 407         }
 408         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 409         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 410                 decoder_flags);
 411 }
 412
 413 static char *configfile_exists(void)
 414 {
 415         static char *config_file;
 416
 417         if (!config_file) {
 418                 char *home = para_homedir();
 419                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 420                 free(home);
 421         }
 422         return file_exists(config_file)? config_file : NULL;
 423 }
 424
 425 static void setup_signal_handling(void)
 426 {
 427         sig_task->fd = para_signal_init();
 428         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 429         para_install_sighandler(SIGINT);
 430         para_install_sighandler(SIGTERM);
 431         para_install_sighandler(SIGCHLD);
 432         para_install_sighandler(SIGHUP);
 433         signal(SIGPIPE, SIG_IGN);
 434 }
 435
 436 static void audiod_status_dump(void)
 437 {
 438         static char *p_ts, *p_us, *p_as, *p_df;
 439         struct timeval *t = wstime();
 440         char *us, *tmp = get_time_string(t);
 441
 442         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 443                 stat_client_write(tmp, SI_PLAY_TIME);
 444         free(p_ts);
 445         p_ts = tmp;
 446
 447         us = uptime_str();
 448         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 449         free(us);
 450         if (!p_us || strcmp(p_us, tmp))
 451                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 452         free(p_us);
 453         p_us = tmp;
 454
 455         tmp = audiod_status_string();
 456         if (!p_as || strcmp(p_as, tmp))
 457                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 458         free(p_as);
 459         p_as = tmp;
 460
 461         tmp = decoder_flags();
 462         if (!p_df || strcmp(p_df, tmp))
 463                 stat_client_write(tmp, SI_DECODER_FLAGS);
 464         free(p_df);
 465         p_df = tmp;
 466 }
 467
 468 static void clear_slot(int slot_num)
 469 {
 470         struct slot_info *s = &slot[slot_num];
 471
 472         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 473         memset(s, 0, sizeof(struct slot_info));
 474         s->format = -1;
 475 }
 476
 477 static void close_receiver(int slot_num)
 478 {
 479         struct slot_info *s = &slot[slot_num];
 480         struct audio_format_info *a;
 481
 482         if (s->format < 0 || !s->receiver_node)
 483                 return;
 484         a = &afi[s->format];
 485         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 486                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 487         if (!s->receiver_node->eof)
 488                 unregister_task(&s->receiver_node->task);
 489         a->receiver->close(s->receiver_node);
 490         free(s->receiver_node);
 491         s->receiver_node = NULL;
 492         /* set restart barrier */
 493         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 494 }
 495
 496 static void kill_all_decoders(void)
 497 {
 498         int i;
 499
 500         FOR_EACH_SLOT(i) {
 501                 struct slot_info *s = &slot[i];
 502                 if (s->receiver_node)
 503                         s->receiver_node->eof = 1;
 504         }
 505 }
 506
 507 static int get_empty_slot(void)
 508 {
 509         int i;
 510         struct slot_info *s;
 511
 512         FOR_EACH_SLOT(i) {
 513                 s = &slot[i];
 514                 if (s->format < 0) {
 515                         clear_slot(i);
 516                         return i;
 517                 }
 518                 if (s->wng || s->receiver_node || s->fc)
 519                         continue;
 520                 clear_slot(i);
 521                 return i;
 522         }
 523         return -E_NO_MORE_SLOTS;
 524 }
 525
 526 static int decoder_running(int format)
 527 {
 528         int i, ret = 0;
 529         struct slot_info *s;
 530
 531         FOR_EACH_SLOT(i) {
 532                 s = &slot[i];
 533                 if (s->format == format && s->receiver_node)
 534                         ret |= 1;
 535                 if (s->format == format && s->wng)
 536                         ret |= 2;
 537         }
 538         return ret;
 539 }
 540
 541 static void close_stat_pipe(void)
 542 {
 543         int i;
 544
 545         if (stat_task->fd < 0)
 546                 return;
 547         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 548         close(stat_task->fd);
 549         del_close_on_fork_list(stat_task->fd);
 550         stat_task->fd = -1;
 551         kill_all_decoders();
 552         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 553                 free(stat_item_values[i]);
 554                 stat_item_values[i] = NULL;
 555         }
 556         dump_empty_status();
 557         length_seconds = 0;
 558         offset_seconds = 0;
 559         audiod_status_dump();
 560         playing = 0;
 561         stat_item_values[SI_STATUS_BAR] = make_message(
 562                 "%s:no connection to para_server\n",
 563                 status_item_list[SI_STATUS_BAR]);
 564         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 565 }
 566
 567 static void __noreturn clean_exit(int status, const char *msg)
 568 {
 569         PARA_EMERG_LOG("%s\n", msg);
 570         if (socket_name)
 571                 unlink(socket_name);
 572         if (stat_task->fd >= 0)
 573                 close_stat_pipe();
 574         exit(status);
 575 }
 576
 577 /**
 578  * get the number of filters
 579  *
 580  * \param audio_format_num the number identifying the audio format
 581  *
 582  * \return the number of filters for the given audio format
 583  *
 584  * \sa struct filter;
 585  */
 586 int num_filters(int audio_format_num)
 587 {
 588         return afi[audio_format_num].num_filters;
 589 }
 590
 591 static void filter_event_handler(struct task *t)
 592 {
 593         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 594         unregister_task(t);
 595 }
 596
 597 static void open_filters(int slot_num)
 598 {
 599         struct slot_info *s = &slot[slot_num];
 600         struct audio_format_info *a = &afi[s->format];
 601         int nf = a->num_filters;
 602         int i;
 603
 604         s->fc = NULL;
 605         if (!nf)
 606                 return;
 607         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 608         s->fc = para_calloc(sizeof(struct filter_chain));
 609         INIT_LIST_HEAD(&s->fc->filters);
 610         s->fc->inbuf = s->receiver_node->buf;
 611         s->fc->in_loaded = &s->receiver_node->loaded;
 612         s->fc->input_eof = &s->receiver_node->eof;
 613
 614         s->fc->task.pre_select = filter_pre_select;
 615         s->fc->task.event_handler = filter_event_handler;
 616         s->fc->task.private_data = s->fc;
 617         s->fc->task.flags = 0;
 618         s->fc->eof = 0;
 619         sprintf(s->fc->task.status, "filter chain");
 620         for (i = 0; i < nf; i++) {
 621                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 622                 fn->conf = a->filter_conf[i];
 623                 fn->fc = s->fc;
 624                 fn->filter = a->filters[i];
 625                 INIT_LIST_HEAD(&fn->callbacks);
 626                 list_add_tail(&fn->node, &s->fc->filters);
 627                 fn->filter->open(fn);
 628                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 629                         audio_formats[s->format], i + 1,  nf,
 630                         fn->filter->name, slot_num);
 631                 s->fc->outbuf = fn->buf;
 632                 s->fc->out_loaded = &fn->loaded;
 633         }
 634         register_task(&s->fc->task);
 635 //      PARA_DEBUG_LOG("output loaded for filter chain %p: %p\n", s->fc,
 636 //              s->fc->out_loaded);
 637 }
 638
 639 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 640 {
 641         struct filter_node *fn;
 642         int i, j;
 643
 644         FOR_EACH_SLOT(i) {
 645                 struct slot_info *s = &slot[i];
 646                 if (s->format < 0 || !s->fc)
 647                         continue;
 648                 if (slot_num >= 0 && slot_num != i)
 649                         continue;
 650                 if (format >= 0 && s->format != format)
 651                         continue;
 652                 if (num_filters(i) < filternum)
 653                         continue;
 654                 /* success */
 655                 j = 1;
 656                 list_for_each_entry(fn, &s->fc->filters, node)
 657                         if (filternum <= 0 || j++ == filternum)
 658                                 break;
 659                 return fn;
 660         }
 661         return NULL;
 662 }
 663
 664 static void wng_event_handler(struct task *t)
 665 {
 666         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 667         unregister_task(t);
 668 }
 669
 670 static void open_writers(int slot_num)
 671 {
 672         int ret, i;
 673         struct slot_info *s = &slot[slot_num];
 674         struct audio_format_info *a = &afi[s->format];
 675
 676         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 677         if (!a->num_writers)
 678                 s->wng = setup_default_wng();
 679         else
 680                 s->wng = wng_new(a->num_writers);
 681         if (s->fc) {
 682                 s->wng->buf = s->fc->outbuf;
 683                 s->wng->loaded = s->fc->out_loaded;
 684                 s->wng->input_eof = &s->fc->eof;
 685                 s->fc->output_eof = &s->wng->eof;
 686         } else {
 687                 s->wng->buf = s->receiver_node->buf;
 688                 s->wng->loaded = &s->receiver_node->loaded;
 689                 s->wng->input_eof = &s->receiver_node->eof;
 690         }
 691         s->wng->task.event_handler = wng_event_handler;
 692         for (i = 0; i < a->num_writers; i++) {
 693                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 694                 s->wng->writer_nodes[i].writer = a->writers[i];
 695                 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
 696         }
 697         ret = wng_open(s->wng);
 698         s->wstime = *now;
 699         current_decoder = slot_num;
 700         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 701 }
 702
 703 static void rn_event_handler(struct task *t)
 704 {
 705         struct receiver_node *rn = t->private_data;
 706         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 707         unregister_task(t);
 708 }
 709
 710 static void open_receiver(int format)
 711 {
 712         struct audio_format_info *a = &afi[format];
 713         struct slot_info *s;
 714         int ret, slot_num;
 715         struct receiver_node *rn;
 716
 717         slot_num = get_empty_slot();
 718         if (slot_num < 0)
 719                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 720         s = &slot[slot_num];
 721         s->format = format;
 722         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 723         rn = s->receiver_node;
 724         rn->receiver = a->receiver;
 725         rn->conf = a->receiver_conf;
 726         ret = a->receiver->open(s->receiver_node);
 727         if (ret < 0) {
 728                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 729                         PARA_STRERROR(-ret));
 730                 free(s->receiver_node);
 731                 s->receiver_node = NULL;
 732                 return;
 733         }
 734         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 735                 audio_formats[s->format], a->receiver->name, slot_num);
 736         rn->task.private_data = s->receiver_node;
 737         rn->task.pre_select = a->receiver->pre_select;
 738         rn->task.post_select = a->receiver->post_select;
 739         rn->task.event_handler = rn_event_handler;
 740         rn->task.flags = 0;
 741         sprintf(rn->task.status, "receiver node");
 742         register_task(&rn->task);
 743 }
 744
 745 static int is_frozen(int format)
 746 {
 747         struct audio_format_info *a = &afi[format];
 748
 749         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 750 }
 751
 752 static void open_current_receiver(void)
 753 {
 754         int i;
 755
 756         if (!af_status)
 757                 return;
 758         i = get_audio_format_num(af_status);
 759         if (i < 0)
 760                 return;
 761         if (decoder_running(i) || is_frozen(i))
 762                 return;
 763         open_receiver(i);
 764 }
 765
 766 static void compute_time_diff(const struct timeval *status_time)
 767 {
 768         struct timeval tmp, diff;
 769         static int count;
 770         int sign;
 771         const struct timeval max_deviation = {0, 500 * 1000};
 772         const int time_smooth = 5;
 773
 774         sign = tv_diff(status_time, now, &diff);
 775 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 776 //                      sign, sa_time_diff_sign);
 777         if (!count) {
 778                 sa_time_diff_sign = sign;
 779                 sa_time_diff = diff;
 780                 count++;
 781                 return;
 782         }
 783         if (count > 5) {
 784                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 785                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 786                         PARA_WARNING_LOG("time diff jump: %lims\n",
 787                                 s * tv2ms(&tmp));
 788         }
 789         count++;
 790         sa_time_diff_sign = tv_convex_combination(
 791                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 792                 count > 10? sign : sign * time_smooth, &diff,
 793                 &tmp);
 794         sa_time_diff = tmp;
 795         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 796                 sign > 0? "+" : "-",
 797                 tv2ms(&diff),
 798                 sa_time_diff_sign ? "+" : "-",
 799                 tv2ms(&sa_time_diff)
 800         );
 801 }
 802
 803 static void check_stat_line(char *line)
 804 {
 805         int itemnum;
 806         size_t ilen = 0;
 807         long unsigned sec, usec;
 808         char *tmp;
 809
 810 //      PARA_INFO_LOG("line: %s\n", line);
 811         if (!line)
 812                 return;
 813         itemnum = stat_line_valid(line);
 814         if (itemnum < 0) {
 815                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 816                 return;
 817         }
 818         tmp = make_message("%s\n", line);
 819         stat_client_write(tmp, itemnum);
 820         free(tmp);
 821         free(stat_item_values[itemnum]);
 822         stat_item_values[itemnum] = para_strdup(line);
 823         ilen = strlen(status_item_list[itemnum]);
 824         switch (itemnum) {
 825         case SI_STATUS:
 826                 playing = strstr(line, "playing")? 1 : 0;
 827                 break;
 828         case SI_FORMAT:
 829                 free(af_status);
 830                 af_status = para_strdup(line + ilen + 1);
 831                 break;
 832         case SI_OFFSET:
 833                 offset_seconds = atoi(line + ilen + 1);
 834                 break;
 835         case SI_LENGTH:
 836                 length_seconds = atoi(line + ilen + 1);
 837                 break;
 838         case SI_STREAM_START:
 839                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 840                         server_stream_start.tv_sec = sec;
 841                         server_stream_start.tv_usec = usec;
 842                 }
 843                 break;
 844         case SI_CURRENT_TIME:
 845                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 846                         struct timeval tv = {sec, usec};
 847                         compute_time_diff(&tv);
 848                 }
 849                 break;
 850         }
 851 }
 852
 853 static void handle_signal(int sig)
 854 {
 855         switch (sig) {
 856         case SIGCHLD:
 857                 for (;;) {
 858                         pid_t pid = para_reap_child();
 859                         if (pid <= 0)
 860                                 return;
 861                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 862                 }
 863         case SIGINT:
 864         case SIGTERM:
 865         case SIGHUP:
 866                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 867                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 868                 return;
 869         }
 870 }
 871
 872 static void try_to_close_slot(int slot_num)
 873 {
 874         struct slot_info *s = &slot[slot_num];
 875
 876         if (s->format < 0)
 877                 return;
 878         if (s->receiver_node && !s->receiver_node->eof)
 879                 return;
 880         if (s->fc && !s->fc->eof)
 881                 return;
 882         if (s->wng && !s->wng->eof)
 883                 return;
 884         PARA_INFO_LOG("closing slot %d \n", slot_num);
 885         wng_close(s->wng);
 886         wng_destroy(s->wng);
 887         close_filters(s->fc);
 888         free(s->fc);
 889         close_receiver(slot_num);
 890         clear_slot(slot_num);
 891 }
 892
 893 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 894 {
 895         int i;
 896
 897         now = &s->now;
 898         if (audiod_status != AUDIOD_ON)
 899                 kill_all_decoders();
 900         else if (playing)
 901                 open_current_receiver();
 902         FOR_EACH_SLOT(i) {
 903                 struct receiver_node *rn;
 904
 905                 try_to_close_slot(i);
 906                 if (slot[i].format < 0)
 907                         continue;
 908                 rn = slot[i].receiver_node;
 909                 if (rn && rn->loaded && !slot[i].wng) {
 910                         open_filters(i);
 911                         open_writers(i);
 912                 }
 913         }
 914 }
 915
 916 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 917 {
 918         /* only save away the current time for other users */
 919         now = &s->now;
 920 }
 921
 922 static void init_audiod_task(struct task *t)
 923 {
 924         t->pre_select = audiod_pre_select;
 925         t->post_select = audiod_post_select;
 926         t->event_handler = NULL;
 927         t->private_data = t;
 928         t->flags = 0;
 929         sprintf(t->status, "audiod task");
 930 }
 931
 932 static int parse_stream_command(const char *txt, char **cmd)
 933 {
 934         char *p = strchr(txt, ':');
 935         int i;
 936
 937         if (!p)
 938                 return -E_MISSING_COLON;
 939         p++;
 940         FOR_EACH_AUDIO_FORMAT(i) {
 941                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 942                         continue;
 943                 *cmd = p;
 944                 return i;
 945         }
 946         return -E_UNSUPPORTED_AUDIO_FORMAT;
 947 }
 948
 949 static int add_filter(int format, char *cmdline)
 950 {
 951         struct audio_format_info *a = &afi[format];
 952         int filter_num, nf = a->num_filters;
 953
 954         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 955         if (filter_num < 0)
 956                 return filter_num;
 957         a->filters[nf] = &filters[filter_num];
 958         a->num_filters++;
 959         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 960                 a->filters[nf]->name);
 961         return filter_num;
 962 }
 963
 964 static int init_writers(void)
 965 {
 966         int i, ret, nw;
 967         char *cmd;
 968         struct audio_format_info *a;
 969
 970         init_supported_writers();
 971         nw = PARA_MAX(1, conf.writer_given);
 972         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 973         FOR_EACH_AUDIO_FORMAT(i) {
 974                 a = &afi[i];
 975                 a->writer_conf = para_malloc(nw * sizeof(void *));
 976                 a->writers = para_malloc(nw * sizeof(struct writer *));
 977                 a->num_writers = 0;
 978         }
 979         for (i = 0; i < conf.writer_given; i++) {
 980                 void *wconf;
 981                 int writer_num;
 982                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 983                 if (ret < 0)
 984                         goto out;
 985                 a = &afi[ret];
 986                 nw = a->num_writers;
 987                 wconf = check_writer_arg(cmd, &writer_num);
 988                 if (!wconf) {
 989                         ret = writer_num;
 990                         goto out;
 991                 }
 992                 a->writers[nw] = &writers[writer_num];
 993                 a->writer_conf[nw] = wconf;
 994                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 995                         nw, writer_names[writer_num]);
 996                 a->num_writers++;
 997         }
 998         ret = 1;
 999 out:
1000         return ret;
1001 }
1002
1003 static int init_receivers(void)
1004 {
1005         int i, ret, receiver_num;
1006         char *cmd = NULL;
1007         struct audio_format_info *a;
1008
1009         for (i = 0; receivers[i].name; i++) {
1010                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1011                 receivers[i].init(&receivers[i]);
1012         }
1013         for (i = 0; i < conf.receiver_given; i++) {
1014                 char *arg = conf.receiver_arg[i];
1015                 char *recv = strchr(arg, ':');
1016                 ret = -E_MISSING_COLON;
1017                 if (!recv)
1018                         goto out;
1019                 *recv = '\0';
1020                 recv++;
1021                 ret = get_audio_format_num(arg);
1022                 if (ret < 0)
1023                         goto out;
1024                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1025                 if (!afi[ret].receiver_conf) {
1026                         ret = -E_RECV_SYNTAX;
1027                         goto out;
1028                 }
1029                 afi[ret].receiver = &receivers[receiver_num];
1030         }
1031         /* use the first available receiver with no arguments
1032          * for those audio formats for which no receiver
1033          * was specified
1034          */
1035         cmd = para_strdup(receivers[0].name);
1036         FOR_EACH_AUDIO_FORMAT(i) {
1037                 a = &afi[i];
1038                 if (a->receiver_conf)
1039                         continue;
1040                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1041                 if (!a->receiver_conf)
1042                         return -E_RECV_SYNTAX;
1043                 a->receiver = &receivers[receiver_num];
1044         }
1045         ret = 1;
1046 out:
1047         free(cmd);
1048         return ret;
1049 }
1050
1051 static int init_default_filters(void)
1052 {
1053         int i, ret = 1;
1054
1055         FOR_EACH_AUDIO_FORMAT(i) {
1056                 struct audio_format_info *a = &afi[i];
1057                 char *tmp;
1058                 int j;
1059
1060                 if (a->num_filters)
1061                         continue; /* no default -- nothing to to */
1062                 /* add "dec" to audio format name */
1063                 tmp = make_message("%sdec", audio_formats[i]);
1064                 for (j = 0; filters[j].name; j++)
1065                         if (!strcmp(tmp, filters[j].name))
1066                                 break;
1067                 free(tmp);
1068                 ret = -E_UNSUPPORTED_FILTER;
1069                 if (!filters[j].name)
1070                         goto out;
1071                 tmp = para_strdup(filters[j].name);
1072                 ret = add_filter(i, tmp);
1073                 free(tmp);
1074                 if (ret < 0)
1075                         goto out;
1076                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1077                         filters[j].name);
1078         }
1079 out:
1080         return ret;
1081 }
1082
1083 static int init_filters(void)
1084 {
1085         int i, ret, nf;
1086
1087         filter_init(filters);
1088         nf = PARA_MAX(1,  conf.filter_given);
1089         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1090         FOR_EACH_AUDIO_FORMAT(i) {
1091                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1092                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1093         }
1094         if (!conf.no_default_filters_given)
1095                 return init_default_filters();
1096         for (i = 0; i < conf.filter_given; i++) {
1097                 char *arg = conf.filter_arg[i];
1098                 char *filter_name = strchr(arg, ':');
1099                 ret = -E_MISSING_COLON;
1100                 if (!filter_name)
1101                         goto out;
1102                 *filter_name = '\0';
1103                 filter_name++;
1104                 ret = get_audio_format_num(arg);
1105                 if (ret < 0)
1106                         goto out;
1107                 ret = add_filter(ret, filter_name);
1108                 if (ret < 0)
1109                         goto out;
1110         }
1111         ret = init_default_filters(); /* use default values for the rest */
1112 out:
1113         return ret;
1114 }
1115
1116 static int init_stream_io(void)
1117 {
1118         int ret;
1119
1120         ret = init_writers();
1121         if (ret < 0)
1122                 return ret;
1123         ret = init_receivers();
1124         if (ret < 0)
1125                 return ret;
1126         ret = init_filters();
1127         if (ret < 0)
1128                 return ret;
1129         return 1;
1130 }
1131
1132 static int dump_commands(int fd)
1133 {
1134         char *buf = para_strdup(""), *tmp = NULL;
1135         int i;
1136         ssize_t ret;
1137
1138         FOR_EACH_COMMAND(i) {
1139                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1140                         cmds[i].description);
1141                 free(buf);
1142                 buf = tmp;
1143         }
1144         ret = client_write(fd, buf);
1145         free(buf);
1146         return ret;
1147 }
1148
1149 /*
1150  * command handlers don't close their fd on errors (ret < 0) so that
1151  * its caller can send an error message. Otherwise (ret >= 0) it's up
1152  * to each individual command to close the fd if necessary.
1153  */
1154
1155 static int com_help(int fd, int argc, char **argv)
1156 {
1157         int i, ret;
1158         char *buf;
1159         const char *dflt = "No such command. Available commands:\n";
1160
1161         if (argc < 2) {
1162                 ret = dump_commands(fd);
1163                 goto out;
1164         }
1165         FOR_EACH_COMMAND(i) {
1166                 if (strcmp(cmds[i].name, argv[1]))
1167                         continue;
1168                 buf = make_message(
1169                         "NAME\n\t%s -- %s\n"
1170                         "SYNOPSIS\n\tpara_audioc %s\n"
1171                         "DESCRIPTION\n%s\n",
1172                         argv[1],
1173                         cmds[i].description,
1174                         cmds[i].synopsis,
1175                         cmds[i].help
1176                 );
1177                 ret = client_write(fd, buf);
1178                 free(buf);
1179                 goto out;
1180         }
1181         ret = client_write(fd, dflt);
1182         if (ret > 0)
1183                 ret = dump_commands(fd);
1184 out:
1185         if (ret >= 0)
1186                 close(fd);
1187         return ret;
1188 }
1189
1190 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1191 {
1192         int i, ret;
1193         char *buf = NULL;
1194         long unsigned mask = ~0LU;
1195
1196         if (argc > 1) {
1197                 mask = 0;
1198                 for (i = 1; i < argc; i++) {
1199                         ret = stat_item_valid(argv[i]);
1200                         if (ret < 0)
1201                                 return ret;
1202                         mask |= (1 << ret);
1203                 }
1204         }
1205         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1206         if (mask & (1 << SI_PLAY_TIME)) {
1207                 struct timeval *t = wstime();
1208                 char *ts = get_time_string(t);
1209                 if (ts) {
1210                         ret = client_write(fd, ts);
1211                         if (ret < 0)
1212                                 goto out;
1213                         free(ts);
1214                 }
1215         }
1216         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1217                 char *tmp, *us = uptime_str();
1218                 tmp = make_message("%s:%s\n",
1219                         status_item_list[SI_AUDIOD_UPTIME], us);
1220                 free(us);
1221                 ret = client_write(fd, tmp);
1222                 if (ret < 0)
1223                         goto out;
1224                 free(tmp);
1225         }
1226         if (mask & (1 << SI_AUDIOD_STATUS)) {
1227                 char *s = audiod_status_string();
1228                 ret = client_write(fd, s);
1229                 if (ret < 0)
1230                         goto out;
1231                 free(s);
1232         }
1233         if (mask & (1 << SI_DECODER_FLAGS)) {
1234                 char *df =decoder_flags();
1235                 ret = client_write(fd, df);
1236                 if (ret < 0)
1237                         goto out;
1238                 free(df);
1239         }
1240
1241         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1242                 char *tmp, *v;
1243                 if (!((1 << i) & mask))
1244                         continue;
1245                 v = stat_item_values[i];
1246                 tmp = make_message("%s%s%s", buf? buf: "",
1247                         v? v : "", v? "\n" : "");
1248                 free(buf);
1249                 buf = tmp;
1250         }
1251         ret = client_write(fd, buf);
1252 out:
1253         if (ret > 0)
1254                 ret = stat_client_add(fd, mask);
1255         free(buf);
1256         return ret;
1257 }
1258
1259 static int com_grab(int fd, char *cmdline)
1260 {
1261         struct grab_client *gc;
1262         struct filter_node *fn;
1263         int i, err;
1264         char *msg;
1265
1266         gc = grab_client_new(fd, cmdline, &err);
1267         if (!gc)
1268                 goto err_out;
1269         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1270         if (fn)
1271                 activate_grab_client(gc, fn);
1272         return 1;
1273 err_out:
1274         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1275                 return err;
1276         if (err == -E_GC_HELP_GIVEN) {
1277                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1278                 for (i = 0; grab_client_args_info_help[i]; i++) {
1279                         char *tmp = make_message("%s%s\n", msg,
1280                                 grab_client_args_info_help[i]);
1281                         free(msg);
1282                         msg = tmp;
1283                 }
1284         } else
1285                 msg = make_message("%s %s\n",
1286                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1287                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1288         err = client_write(fd, msg);
1289         free(msg);
1290         if (err < 0)
1291                 return err;
1292         close(fd);
1293         return 1;
1294 }
1295
1296 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1297 {
1298         close(fd);
1299         clean_exit(EXIT_SUCCESS, "terminating on user request");
1300 }
1301
1302 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1303 {
1304         audiod_status = AUDIOD_ON;
1305         close(fd);
1306         return 1;
1307 }
1308
1309 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1310 {
1311         audiod_status = AUDIOD_OFF;
1312         close(fd);
1313         return 1;
1314 }
1315
1316 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1317 {
1318         audiod_status = AUDIOD_STANDBY;
1319         close(fd);
1320         return 1;
1321 }
1322
1323 static int com_cycle(int fd, int argc, char **argv)
1324 {
1325         switch (audiod_status) {
1326                 case  AUDIOD_ON:
1327                         return com_sb(fd, argc, argv);
1328                         break;
1329                 case  AUDIOD_OFF:
1330                         return com_on(fd, argc, argv);
1331                         break;
1332                 case  AUDIOD_STANDBY:
1333                         return com_off(fd, argc, argv);
1334                         break;
1335         }
1336         close(fd);
1337         return 1;
1338 }
1339
1340 static int check_perms(uid_t uid)
1341 {
1342         int i;
1343
1344         if (!conf.user_allow_given)
1345                 return 1;
1346         for (i = 0; i < conf.user_allow_given; i++)
1347                 if (uid == conf.user_allow_arg[i])
1348                         return 1;
1349         return -E_UCRED_PERM;
1350 }
1351
1352 static int handle_connect(int accept_fd)
1353 {
1354         int i, argc, ret, clifd = -1;
1355         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1356         struct sockaddr_un unix_addr;
1357
1358         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
1359         if (ret < 0)
1360                 goto out;
1361         clifd = ret;
1362         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1363         if (ret < 0)
1364                 goto out;
1365         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1366         ret = check_perms(ret);
1367         if (ret < 0)
1368                 goto out;
1369         ret = -E_INVALID_AUDIOD_CMD;
1370         cmd = para_strdup(buf);
1371         p = strchr(cmd, '\n');
1372         if (!p)
1373                 p = "";
1374         else {
1375                 *p = '\0';
1376                 p++;
1377         }
1378         for (i = 0; cmds[i].name; i++) {
1379                 int j;
1380                 if (strcmp(cmds[i].name, cmd))
1381                         continue;
1382                 if (cmds[i].handler) {
1383                         argc = split_args(buf, &argv, "\n");
1384                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1385                         ret = cmds[i].handler(clifd, argc, argv);
1386                         goto out;
1387                 }
1388                 for (j = 0; p[j]; j++)
1389                         if (p[j] == '\n')
1390                                 p[j] = ' ';
1391                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1392                 ret = cmds[i].line_handler(clifd, p);
1393                 goto out;
1394         }
1395         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1396 out:
1397         free(cmd);
1398         free(buf);
1399         free(argv);
1400         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1401                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1402                 client_write(clifd, tmp);
1403                 free(tmp);
1404                 close(clifd);
1405         }
1406         return ret;
1407 }
1408
1409 static int audiod_get_socket(void)
1410 {
1411         struct sockaddr_un unix_addr;
1412         int fd;
1413
1414         if (conf.socket_given)
1415                 socket_name = para_strdup(conf.socket_arg);
1416         else {
1417                 char *hn = para_hostname();
1418                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1419                         hn);
1420                 free(hn);
1421         }
1422         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1423         if (conf.force_given)
1424                 unlink(socket_name);
1425         fd = create_pf_socket(socket_name, &unix_addr,
1426                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1427         if (fd < 0) {
1428                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1429                 exit(EXIT_FAILURE); /* do not unlink socket */
1430         }
1431         if (listen(fd , 5) < 0) {
1432                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1433                 exit(EXIT_FAILURE); /* do not unlink socket */
1434         }
1435         add_close_on_fork_list(fd);
1436         return fd;
1437 }
1438
1439 static int open_stat_pipe(void)
1440 {
1441         int ret, fd[3] = {-1, 1, 0};
1442         pid_t pid;
1443         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1444         if (ret >= 0) {
1445                 ret = fd[1];
1446                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1447                 add_close_on_fork_list(ret);
1448         } else
1449                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1450         return ret;
1451 }
1452
1453 void signal_event_handler(struct task *t)
1454 {
1455         struct signal_task *st = t->private_data;
1456         handle_signal(st->signum);
1457 }
1458
1459 void signal_pre_select(struct sched *s, struct task *t)
1460 {
1461         struct signal_task *st = t->private_data;
1462         t->ret = 1;
1463         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1464 }
1465
1466 void signal_post_select(struct sched *s, struct task *t)
1467 {
1468         struct signal_task *st = t->private_data;
1469         t->ret = 1;
1470         if (!FD_ISSET(st->fd, &s->rfds))
1471                 return;
1472         t->ret = -E_SIGNAL_CAUGHT;
1473         st->signum = para_next_signal();
1474 }
1475
1476 void signal_setup_default(struct signal_task *st)
1477 {
1478         st->task.pre_select = signal_pre_select;
1479         st->task.post_select = signal_post_select;
1480         st->task.private_data = st;
1481         st->task.flags = 0;
1482         sprintf(st->task.status, "signal task");
1483 }
1484
1485 static void command_pre_select(struct sched *s, struct task *t)
1486 {
1487         struct command_task *ct = t->private_data;
1488         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1489
1490 }
1491
1492 static void command_post_select(struct sched *s, struct task *t)
1493 {
1494         int ret;
1495         struct command_task *ct = t->private_data;
1496
1497         if (audiod_status != AUDIOD_OFF)
1498                 audiod_status_dump();
1499         t->ret = 1; /* always successful */
1500         if (!FD_ISSET(ct->fd, &s->rfds))
1501                 return;
1502         ret = handle_connect(ct->fd);
1503         if (ret < 0)
1504                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1505 }
1506
1507 static void init_command_task(struct command_task *ct)
1508 {
1509         ct->task.pre_select = command_pre_select;
1510         ct->task.post_select = command_post_select;
1511         ct->task.event_handler = NULL;
1512         ct->task.private_data = ct;
1513         ct->task.flags = 0;
1514         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1515         sprintf(ct->task.status, "command task");
1516 }
1517
1518 static void status_pre_select(struct sched *s, struct task *t)
1519 {
1520         struct status_task *st = t->private_data;
1521         t->ret = 1;
1522         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1523                 close_stat_pipe();
1524         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1525                 st->fd = open_stat_pipe();
1526                 st->loaded = 0;
1527                 st->buf[0] = '\0';
1528         }
1529         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1530                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1531 }
1532
1533 static void status_post_select(struct sched *s, struct task *t)
1534 {
1535         struct status_task *st = t->private_data;
1536         int ret;
1537
1538         t->ret = 1;
1539         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1540                 return;
1541         ret = read(st->fd, st->buf + st->loaded,
1542                 STRINGSIZE - 1 - st->loaded);
1543         if (ret <= 0) {
1544                 close_stat_pipe();
1545                 /* avoid busy loop if server is down */
1546                 while (sleep(1) > 0) /* FIXME */
1547                         ; /* try again*/
1548         } else {
1549                 st->buf[ret + st->loaded] = '\0';
1550                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1551                         &check_stat_line);
1552         }
1553 }
1554
1555 static void init_status_task(struct status_task *st)
1556 {
1557         st->task.pre_select = status_pre_select;
1558         st->task.post_select = status_post_select;
1559         st->task.private_data = st;
1560         st->task.flags = 0;
1561         st->loaded = 0;
1562         st->fd = -1;
1563         st->buf[0] = '\0';
1564         sprintf(st->task.status, "status task");
1565 }
1566
1567 static void set_initial_status(void)
1568 {
1569         audiod_status = AUDIOD_ON;
1570         if (!conf.mode_given)
1571                 return;
1572         if (!strcmp(conf.mode_arg, "sb")) {
1573                 audiod_status = AUDIOD_STANDBY;
1574                 return;
1575         }
1576         if (!strcmp(conf.mode_arg, "off")) {
1577                 audiod_status = AUDIOD_OFF;
1578                 return;
1579         }
1580         if (strcmp(conf.mode_arg, "on"))
1581                 PARA_WARNING_LOG("%s", "invalid mode\n");
1582 }
1583
1584 int main(int argc, char *argv[])
1585 {
1586         char *cf;
1587         int ret, i;
1588         struct sched s;
1589         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1590         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1591
1592         init_sched();
1593
1594         valid_fd_012();
1595         hostname = para_hostname();
1596         cmdline_parser(argc, argv, &conf);
1597         para_drop_privileges(conf.user_arg, conf.group_arg);
1598         cf = configfile_exists();
1599         if (cf) {
1600                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1601                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1602                         exit(EXIT_FAILURE);
1603                 }
1604         }
1605         if (conf.logfile_given)
1606                 logfile = open_log(conf.logfile_arg);
1607         log_welcome("para_audiod", conf.loglevel_arg);
1608         i = init_stream_io();
1609         if (i < 0) {
1610                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1611                 exit(EXIT_FAILURE);
1612         }
1613         server_uptime(UPTIME_SET);
1614         set_initial_status();
1615         FOR_EACH_SLOT(i)
1616                 clear_slot(i);
1617         init_grabbing();
1618         setup_signal_handling();
1619         signal_setup_default(sig_task);
1620         sig_task->task.event_handler = signal_event_handler;
1621
1622         init_status_task(stat_task);
1623         init_command_task(cmd_task);
1624         init_audiod_task(audiod_task);
1625
1626         if (conf.daemon_given)
1627                 daemon_init();
1628
1629         register_task(&sig_task->task);
1630         register_task(&cmd_task->task);
1631         register_task(&stat_task->task);
1632         register_task(audiod_task);
1633         s.default_timeout.tv_sec = 0;
1634         s.default_timeout.tv_usec = 99 * 1000;
1635         ret = sched(&s);
1636
1637         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1638         return EXIT_FAILURE;
1639 }