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 }
 636
 637 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 638 {
 639         struct filter_node *fn;
 640         int i, j;
 641
 642         FOR_EACH_SLOT(i) {
 643                 struct slot_info *s = &slot[i];
 644                 if (s->format < 0 || !s->fc)
 645                         continue;
 646                 if (slot_num >= 0 && slot_num != i)
 647                         continue;
 648                 if (format >= 0 && s->format != format)
 649                         continue;
 650                 if (num_filters(i) < filternum)
 651                         continue;
 652                 /* success */
 653                 j = 1;
 654                 list_for_each_entry(fn, &s->fc->filters, node)
 655                         if (filternum <= 0 || j++ == filternum)
 656                                 break;
 657                 return fn;
 658         }
 659         return NULL;
 660 }
 661
 662 static void wng_event_handler(struct task *t)
 663 {
 664         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 665         unregister_task(t);
 666 }
 667
 668 static void open_writers(int slot_num)
 669 {
 670         int ret, i;
 671         struct slot_info *s = &slot[slot_num];
 672         struct audio_format_info *a = &afi[s->format];
 673
 674         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 675         if (!a->num_writers)
 676                 s->wng = setup_default_wng();
 677         else
 678                 s->wng = wng_new(a->num_writers);
 679         if (s->fc) {
 680                 s->wng->buf = s->fc->outbuf;
 681                 s->wng->loaded = s->fc->out_loaded;
 682                 s->wng->input_eof = &s->fc->eof;
 683                 s->fc->output_eof = &s->wng->eof;
 684         } else {
 685                 s->wng->buf = s->receiver_node->buf;
 686                 s->wng->loaded = &s->receiver_node->loaded;
 687                 s->wng->input_eof = &s->receiver_node->eof;
 688         }
 689         s->wng->task.event_handler = wng_event_handler;
 690         for (i = 0; i < a->num_writers; i++) {
 691                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 692                 s->wng->writer_nodes[i].writer = a->writers[i];
 693                 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
 694         }
 695         ret = wng_open(s->wng);
 696         s->wstime = *now;
 697         current_decoder = slot_num;
 698         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 699 }
 700
 701 static void rn_event_handler(struct task *t)
 702 {
 703 //      struct receiver_node *rn = t->private_data;
 704         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 705         unregister_task(t);
 706 }
 707
 708 static void open_receiver(int format)
 709 {
 710         struct audio_format_info *a = &afi[format];
 711         struct slot_info *s;
 712         int ret, slot_num;
 713         struct receiver_node *rn;
 714
 715         slot_num = get_empty_slot();
 716         if (slot_num < 0)
 717                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 718         s = &slot[slot_num];
 719         s->format = format;
 720         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 721         rn = s->receiver_node;
 722         rn->receiver = a->receiver;
 723         rn->conf = a->receiver_conf;
 724         ret = a->receiver->open(s->receiver_node);
 725         if (ret < 0) {
 726                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 727                         PARA_STRERROR(-ret));
 728                 free(s->receiver_node);
 729                 s->receiver_node = NULL;
 730                 return;
 731         }
 732         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 733                 audio_formats[s->format], a->receiver->name, slot_num);
 734         rn->task.private_data = s->receiver_node;
 735         rn->task.pre_select = a->receiver->pre_select;
 736         rn->task.post_select = a->receiver->post_select;
 737         rn->task.event_handler = rn_event_handler;
 738         rn->task.flags = 0;
 739         sprintf(rn->task.status, "receiver node");
 740         register_task(&rn->task);
 741 }
 742
 743 static int is_frozen(int format)
 744 {
 745         struct audio_format_info *a = &afi[format];
 746
 747         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 748 }
 749
 750 static void open_current_receiver(void)
 751 {
 752         int i;
 753
 754         if (!af_status)
 755                 return;
 756         i = get_audio_format_num(af_status);
 757         if (i < 0)
 758                 return;
 759         if (decoder_running(i) || is_frozen(i))
 760                 return;
 761         open_receiver(i);
 762 }
 763
 764 static void compute_time_diff(const struct timeval *status_time)
 765 {
 766         struct timeval tmp, diff;
 767         static int count;
 768         int sign;
 769         const struct timeval max_deviation = {0, 500 * 1000};
 770         const int time_smooth = 5;
 771
 772         sign = tv_diff(status_time, now, &diff);
 773 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 774 //                      sign, sa_time_diff_sign);
 775         if (!count) {
 776                 sa_time_diff_sign = sign;
 777                 sa_time_diff = diff;
 778                 count++;
 779                 return;
 780         }
 781         if (count > 5) {
 782                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 783                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 784                         PARA_WARNING_LOG("time diff jump: %lims\n",
 785                                 s * tv2ms(&tmp));
 786         }
 787         count++;
 788         sa_time_diff_sign = tv_convex_combination(
 789                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 790                 count > 10? sign : sign * time_smooth, &diff,
 791                 &tmp);
 792         sa_time_diff = tmp;
 793         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 794                 sign > 0? "+" : "-",
 795                 tv2ms(&diff),
 796                 sa_time_diff_sign ? "+" : "-",
 797                 tv2ms(&sa_time_diff)
 798         );
 799 }
 800
 801 static void check_stat_line(char *line)
 802 {
 803         int itemnum;
 804         size_t ilen = 0;
 805         long unsigned sec, usec;
 806         char *tmp;
 807
 808 //      PARA_INFO_LOG("line: %s\n", line);
 809         if (!line)
 810                 return;
 811         itemnum = stat_line_valid(line);
 812         if (itemnum < 0) {
 813                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 814                 return;
 815         }
 816         tmp = make_message("%s\n", line);
 817         stat_client_write(tmp, itemnum);
 818         free(tmp);
 819         free(stat_item_values[itemnum]);
 820         stat_item_values[itemnum] = para_strdup(line);
 821         ilen = strlen(status_item_list[itemnum]);
 822         switch (itemnum) {
 823         case SI_STATUS:
 824                 playing = strstr(line, "playing")? 1 : 0;
 825                 break;
 826         case SI_FORMAT:
 827                 free(af_status);
 828                 af_status = para_strdup(line + ilen + 1);
 829                 break;
 830         case SI_OFFSET:
 831                 offset_seconds = atoi(line + ilen + 1);
 832                 break;
 833         case SI_LENGTH:
 834                 length_seconds = atoi(line + ilen + 1);
 835                 break;
 836         case SI_STREAM_START:
 837                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 838                         server_stream_start.tv_sec = sec;
 839                         server_stream_start.tv_usec = usec;
 840                 }
 841                 break;
 842         case SI_CURRENT_TIME:
 843                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 844                         struct timeval tv = {sec, usec};
 845                         compute_time_diff(&tv);
 846                 }
 847                 break;
 848         }
 849 }
 850
 851 static void handle_signal(int sig)
 852 {
 853         switch (sig) {
 854         case SIGCHLD:
 855                 for (;;) {
 856                         pid_t pid = para_reap_child();
 857                         if (pid <= 0)
 858                                 return;
 859                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 860                 }
 861         case SIGINT:
 862         case SIGTERM:
 863         case SIGHUP:
 864                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 865                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 866                 return;
 867         }
 868 }
 869
 870 static void try_to_close_slot(int slot_num)
 871 {
 872         struct slot_info *s = &slot[slot_num];
 873
 874         if (s->format < 0)
 875                 return;
 876         if (s->receiver_node && !s->receiver_node->eof)
 877                 return;
 878         if (s->fc && !s->fc->eof)
 879                 return;
 880         if (s->wng && !s->wng->eof)
 881                 return;
 882         PARA_INFO_LOG("closing slot %d \n", slot_num);
 883         wng_close(s->wng);
 884         wng_destroy(s->wng);
 885         close_filters(s->fc);
 886         free(s->fc);
 887         close_receiver(slot_num);
 888         clear_slot(slot_num);
 889 }
 890
 891 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 892 {
 893         int i;
 894
 895         now = &s->now;
 896         if (audiod_status != AUDIOD_ON)
 897                 kill_all_decoders();
 898         else if (playing)
 899                 open_current_receiver();
 900         FOR_EACH_SLOT(i) {
 901                 struct receiver_node *rn;
 902
 903                 try_to_close_slot(i);
 904                 if (slot[i].format < 0)
 905                         continue;
 906                 rn = slot[i].receiver_node;
 907                 if (rn && rn->loaded && !slot[i].wng) {
 908                         open_filters(i);
 909                         open_writers(i);
 910                 }
 911         }
 912 }
 913
 914 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 915 {
 916         /* only save away the current time for other users */
 917         now = &s->now;
 918 }
 919
 920 static void init_audiod_task(struct task *t)
 921 {
 922         t->pre_select = audiod_pre_select;
 923         t->post_select = audiod_post_select;
 924         t->event_handler = NULL;
 925         t->private_data = t;
 926         t->flags = 0;
 927         sprintf(t->status, "audiod task");
 928 }
 929
 930 static int parse_stream_command(const char *txt, char **cmd)
 931 {
 932         char *p = strchr(txt, ':');
 933         int i;
 934
 935         if (!p)
 936                 return -E_MISSING_COLON;
 937         p++;
 938         FOR_EACH_AUDIO_FORMAT(i) {
 939                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 940                         continue;
 941                 *cmd = p;
 942                 return i;
 943         }
 944         return -E_UNSUPPORTED_AUDIO_FORMAT;
 945 }
 946
 947 static int add_filter(int format, char *cmdline)
 948 {
 949         struct audio_format_info *a = &afi[format];
 950         int filter_num, nf = a->num_filters;
 951
 952         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 953         if (filter_num < 0)
 954                 return filter_num;
 955         a->filters[nf] = &filters[filter_num];
 956         a->num_filters++;
 957         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 958                 a->filters[nf]->name);
 959         return filter_num;
 960 }
 961
 962 static int init_writers(void)
 963 {
 964         int i, ret, nw;
 965         char *cmd;
 966         struct audio_format_info *a;
 967
 968         init_supported_writers();
 969         nw = PARA_MAX(1, conf.writer_given);
 970         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 971         FOR_EACH_AUDIO_FORMAT(i) {
 972                 a = &afi[i];
 973                 a->writer_conf = para_malloc(nw * sizeof(void *));
 974                 a->writers = para_malloc(nw * sizeof(struct writer *));
 975                 a->num_writers = 0;
 976         }
 977         for (i = 0; i < conf.writer_given; i++) {
 978                 void *wconf;
 979                 int writer_num;
 980                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 981                 if (ret < 0)
 982                         goto out;
 983                 a = &afi[ret];
 984                 nw = a->num_writers;
 985                 wconf = check_writer_arg(cmd, &writer_num);
 986                 if (!wconf) {
 987                         ret = writer_num;
 988                         goto out;
 989                 }
 990                 a->writers[nw] = &writers[writer_num];
 991                 a->writer_conf[nw] = wconf;
 992                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 993                         nw, writer_names[writer_num]);
 994                 a->num_writers++;
 995         }
 996         ret = 1;
 997 out:
 998         return ret;
 999 }
1000
1001 static int init_receivers(void)
1002 {
1003         int i, ret, receiver_num;
1004         char *cmd = NULL;
1005         struct audio_format_info *a;
1006
1007         for (i = 0; receivers[i].name; i++) {
1008                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1009                 receivers[i].init(&receivers[i]);
1010         }
1011         for (i = 0; i < conf.receiver_given; i++) {
1012                 char *arg = conf.receiver_arg[i];
1013                 char *recv = strchr(arg, ':');
1014                 ret = -E_MISSING_COLON;
1015                 if (!recv)
1016                         goto out;
1017                 *recv = '\0';
1018                 recv++;
1019                 ret = get_audio_format_num(arg);
1020                 if (ret < 0)
1021                         goto out;
1022                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1023                 if (!afi[ret].receiver_conf) {
1024                         ret = -E_RECV_SYNTAX;
1025                         goto out;
1026                 }
1027                 afi[ret].receiver = &receivers[receiver_num];
1028         }
1029         /* use the first available receiver with no arguments
1030          * for those audio formats for which no receiver
1031          * was specified
1032          */
1033         cmd = para_strdup(receivers[0].name);
1034         FOR_EACH_AUDIO_FORMAT(i) {
1035                 a = &afi[i];
1036                 if (a->receiver_conf)
1037                         continue;
1038                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1039                 if (!a->receiver_conf)
1040                         return -E_RECV_SYNTAX;
1041                 a->receiver = &receivers[receiver_num];
1042         }
1043         ret = 1;
1044 out:
1045         free(cmd);
1046         return ret;
1047 }
1048
1049 static int init_default_filters(void)
1050 {
1051         int i, ret = 1;
1052
1053         FOR_EACH_AUDIO_FORMAT(i) {
1054                 struct audio_format_info *a = &afi[i];
1055                 char *tmp;
1056                 int j;
1057
1058                 if (a->num_filters)
1059                         continue; /* no default -- nothing to to */
1060                 /* add "dec" to audio format name */
1061                 tmp = make_message("%sdec", audio_formats[i]);
1062                 for (j = 0; filters[j].name; j++)
1063                         if (!strcmp(tmp, filters[j].name))
1064                                 break;
1065                 free(tmp);
1066                 ret = -E_UNSUPPORTED_FILTER;
1067                 if (!filters[j].name)
1068                         goto out;
1069                 tmp = para_strdup(filters[j].name);
1070                 ret = add_filter(i, tmp);
1071                 free(tmp);
1072                 if (ret < 0)
1073                         goto out;
1074                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1075                         filters[j].name);
1076         }
1077 out:
1078         return ret;
1079 }
1080
1081 static int init_filters(void)
1082 {
1083         int i, ret, nf;
1084
1085         filter_init(filters);
1086         nf = PARA_MAX(1,  conf.filter_given);
1087         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1088         FOR_EACH_AUDIO_FORMAT(i) {
1089                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1090                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1091         }
1092         if (!conf.no_default_filters_given)
1093                 return init_default_filters();
1094         for (i = 0; i < conf.filter_given; i++) {
1095                 char *arg = conf.filter_arg[i];
1096                 char *filter_name = strchr(arg, ':');
1097                 ret = -E_MISSING_COLON;
1098                 if (!filter_name)
1099                         goto out;
1100                 *filter_name = '\0';
1101                 filter_name++;
1102                 ret = get_audio_format_num(arg);
1103                 if (ret < 0)
1104                         goto out;
1105                 ret = add_filter(ret, filter_name);
1106                 if (ret < 0)
1107                         goto out;
1108         }
1109         ret = init_default_filters(); /* use default values for the rest */
1110 out:
1111         return ret;
1112 }
1113
1114 static int init_stream_io(void)
1115 {
1116         int ret;
1117
1118         ret = init_writers();
1119         if (ret < 0)
1120                 return ret;
1121         ret = init_receivers();
1122         if (ret < 0)
1123                 return ret;
1124         ret = init_filters();
1125         if (ret < 0)
1126                 return ret;
1127         return 1;
1128 }
1129
1130 static int dump_commands(int fd)
1131 {
1132         char *buf = para_strdup(""), *tmp = NULL;
1133         int i;
1134         ssize_t ret;
1135
1136         FOR_EACH_COMMAND(i) {
1137                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1138                         cmds[i].description);
1139                 free(buf);
1140                 buf = tmp;
1141         }
1142         ret = client_write(fd, buf);
1143         free(buf);
1144         return ret;
1145 }
1146
1147 /*
1148  * command handlers don't close their fd on errors (ret < 0) so that
1149  * its caller can send an error message. Otherwise (ret >= 0) it's up
1150  * to each individual command to close the fd if necessary.
1151  */
1152
1153 static int com_help(int fd, int argc, char **argv)
1154 {
1155         int i, ret;
1156         char *buf;
1157         const char *dflt = "No such command. Available commands:\n";
1158
1159         if (argc < 2) {
1160                 ret = dump_commands(fd);
1161                 goto out;
1162         }
1163         FOR_EACH_COMMAND(i) {
1164                 if (strcmp(cmds[i].name, argv[1]))
1165                         continue;
1166                 buf = make_message(
1167                         "NAME\n\t%s -- %s\n"
1168                         "SYNOPSIS\n\tpara_audioc %s\n"
1169                         "DESCRIPTION\n%s\n",
1170                         argv[1],
1171                         cmds[i].description,
1172                         cmds[i].synopsis,
1173                         cmds[i].help
1174                 );
1175                 ret = client_write(fd, buf);
1176                 free(buf);
1177                 goto out;
1178         }
1179         ret = client_write(fd, dflt);
1180         if (ret > 0)
1181                 ret = dump_commands(fd);
1182 out:
1183         if (ret >= 0)
1184                 close(fd);
1185         return ret;
1186 }
1187
1188 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1189 {
1190         int i, ret;
1191         char *buf = NULL;
1192         long unsigned mask = ~0LU;
1193
1194         if (argc > 1) {
1195                 mask = 0;
1196                 for (i = 1; i < argc; i++) {
1197                         ret = stat_item_valid(argv[i]);
1198                         if (ret < 0)
1199                                 return ret;
1200                         mask |= (1 << ret);
1201                 }
1202         }
1203         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1204         if (mask & (1 << SI_PLAY_TIME)) {
1205                 struct timeval *t = wstime();
1206                 char *ts = get_time_string(t);
1207                 if (ts) {
1208                         ret = client_write(fd, ts);
1209                         if (ret < 0)
1210                                 goto out;
1211                         free(ts);
1212                 }
1213         }
1214         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1215                 char *tmp, *us = uptime_str();
1216                 tmp = make_message("%s:%s\n",
1217                         status_item_list[SI_AUDIOD_UPTIME], us);
1218                 free(us);
1219                 ret = client_write(fd, tmp);
1220                 if (ret < 0)
1221                         goto out;
1222                 free(tmp);
1223         }
1224         if (mask & (1 << SI_AUDIOD_STATUS)) {
1225                 char *s = audiod_status_string();
1226                 ret = client_write(fd, s);
1227                 if (ret < 0)
1228                         goto out;
1229                 free(s);
1230         }
1231         if (mask & (1 << SI_DECODER_FLAGS)) {
1232                 char *df =decoder_flags();
1233                 ret = client_write(fd, df);
1234                 if (ret < 0)
1235                         goto out;
1236                 free(df);
1237         }
1238
1239         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1240                 char *tmp, *v;
1241                 if (!((1 << i) & mask))
1242                         continue;
1243                 v = stat_item_values[i];
1244                 tmp = make_message("%s%s%s", buf? buf: "",
1245                         v? v : "", v? "\n" : "");
1246                 free(buf);
1247                 buf = tmp;
1248         }
1249         ret = client_write(fd, buf);
1250 out:
1251         if (ret > 0)
1252                 ret = stat_client_add(fd, mask);
1253         free(buf);
1254         return ret;
1255 }
1256
1257 static int com_grab(int fd, char *cmdline)
1258 {
1259         struct grab_client *gc;
1260         struct filter_node *fn;
1261         int i, err;
1262         char *msg;
1263
1264         gc = grab_client_new(fd, cmdline, &err);
1265         if (!gc)
1266                 goto err_out;
1267         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1268         if (fn)
1269                 activate_grab_client(gc, fn);
1270         return 1;
1271 err_out:
1272         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1273                 return err;
1274         if (err == -E_GC_HELP_GIVEN) {
1275                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1276                 for (i = 0; grab_client_args_info_help[i]; i++) {
1277                         char *tmp = make_message("%s%s\n", msg,
1278                                 grab_client_args_info_help[i]);
1279                         free(msg);
1280                         msg = tmp;
1281                 }
1282         } else
1283                 msg = make_message("%s %s\n",
1284                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1285                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1286         err = client_write(fd, msg);
1287         free(msg);
1288         if (err < 0)
1289                 return err;
1290         close(fd);
1291         return 1;
1292 }
1293
1294 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1295 {
1296         close(fd);
1297         clean_exit(EXIT_SUCCESS, "terminating on user request");
1298 }
1299
1300 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1301 {
1302         audiod_status = AUDIOD_ON;
1303         close(fd);
1304         return 1;
1305 }
1306
1307 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1308 {
1309         audiod_status = AUDIOD_OFF;
1310         close(fd);
1311         return 1;
1312 }
1313
1314 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1315 {
1316         audiod_status = AUDIOD_STANDBY;
1317         close(fd);
1318         return 1;
1319 }
1320
1321 static int com_cycle(int fd, int argc, char **argv)
1322 {
1323         switch (audiod_status) {
1324                 case  AUDIOD_ON:
1325                         return com_sb(fd, argc, argv);
1326                         break;
1327                 case  AUDIOD_OFF:
1328                         return com_on(fd, argc, argv);
1329                         break;
1330                 case  AUDIOD_STANDBY:
1331                         return com_off(fd, argc, argv);
1332                         break;
1333         }
1334         close(fd);
1335         return 1;
1336 }
1337
1338 static int check_perms(uid_t uid)
1339 {
1340         int i;
1341
1342         if (!conf.user_allow_given)
1343                 return 1;
1344         for (i = 0; i < conf.user_allow_given; i++)
1345                 if (uid == conf.user_allow_arg[i])
1346                         return 1;
1347         return -E_UCRED_PERM;
1348 }
1349
1350 static int handle_connect(int accept_fd)
1351 {
1352         int i, argc, ret, clifd = -1;
1353         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1354         struct sockaddr_un unix_addr;
1355
1356         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
1357         if (ret < 0)
1358                 goto out;
1359         clifd = ret;
1360         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1361         if (ret < 0)
1362                 goto out;
1363         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1364         ret = check_perms(ret);
1365         if (ret < 0)
1366                 goto out;
1367         ret = -E_INVALID_AUDIOD_CMD;
1368         cmd = para_strdup(buf);
1369         p = strchr(cmd, '\n');
1370         if (!p)
1371                 p = "";
1372         else {
1373                 *p = '\0';
1374                 p++;
1375         }
1376         for (i = 0; cmds[i].name; i++) {
1377                 int j;
1378                 if (strcmp(cmds[i].name, cmd))
1379                         continue;
1380                 if (cmds[i].handler) {
1381                         argc = split_args(buf, &argv, "\n");
1382                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1383                         ret = cmds[i].handler(clifd, argc, argv);
1384                         goto out;
1385                 }
1386                 for (j = 0; p[j]; j++)
1387                         if (p[j] == '\n')
1388                                 p[j] = ' ';
1389                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1390                 ret = cmds[i].line_handler(clifd, p);
1391                 goto out;
1392         }
1393         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1394 out:
1395         free(cmd);
1396         free(buf);
1397         free(argv);
1398         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1399                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1400                 client_write(clifd, tmp);
1401                 free(tmp);
1402                 close(clifd);
1403         }
1404         return ret;
1405 }
1406
1407 static int audiod_get_socket(void)
1408 {
1409         struct sockaddr_un unix_addr;
1410         int fd;
1411
1412         if (conf.socket_given)
1413                 socket_name = para_strdup(conf.socket_arg);
1414         else {
1415                 char *hn = para_hostname();
1416                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1417                         hn);
1418                 free(hn);
1419         }
1420         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1421         if (conf.force_given)
1422                 unlink(socket_name);
1423         fd = create_pf_socket(socket_name, &unix_addr,
1424                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1425         if (fd < 0) {
1426                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1427                 exit(EXIT_FAILURE); /* do not unlink socket */
1428         }
1429         if (listen(fd , 5) < 0) {
1430                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1431                 exit(EXIT_FAILURE); /* do not unlink socket */
1432         }
1433         add_close_on_fork_list(fd);
1434         return fd;
1435 }
1436
1437 static int open_stat_pipe(void)
1438 {
1439         int ret, fd[3] = {-1, 1, 0};
1440         pid_t pid;
1441         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1442         if (ret >= 0) {
1443                 ret = fd[1];
1444                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1445                 add_close_on_fork_list(ret);
1446         } else
1447                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1448         return ret;
1449 }
1450
1451 void signal_event_handler(struct task *t)
1452 {
1453         struct signal_task *st = t->private_data;
1454         handle_signal(st->signum);
1455 }
1456
1457 void signal_pre_select(struct sched *s, struct task *t)
1458 {
1459         struct signal_task *st = t->private_data;
1460         t->ret = 1;
1461         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1462 }
1463
1464 void signal_post_select(struct sched *s, struct task *t)
1465 {
1466         struct signal_task *st = t->private_data;
1467         t->ret = 1;
1468         if (!FD_ISSET(st->fd, &s->rfds))
1469                 return;
1470         t->ret = -E_SIGNAL_CAUGHT;
1471         st->signum = para_next_signal();
1472 }
1473
1474 void signal_setup_default(struct signal_task *st)
1475 {
1476         st->task.pre_select = signal_pre_select;
1477         st->task.post_select = signal_post_select;
1478         st->task.private_data = st;
1479         st->task.flags = 0;
1480         sprintf(st->task.status, "signal task");
1481 }
1482
1483 static void command_pre_select(struct sched *s, struct task *t)
1484 {
1485         struct command_task *ct = t->private_data;
1486         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1487
1488 }
1489
1490 static void command_post_select(struct sched *s, struct task *t)
1491 {
1492         int ret;
1493         struct command_task *ct = t->private_data;
1494
1495         if (audiod_status != AUDIOD_OFF)
1496                 audiod_status_dump();
1497         t->ret = 1; /* always successful */
1498         if (!FD_ISSET(ct->fd, &s->rfds))
1499                 return;
1500         ret = handle_connect(ct->fd);
1501         if (ret < 0)
1502                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1503 }
1504
1505 static void init_command_task(struct command_task *ct)
1506 {
1507         ct->task.pre_select = command_pre_select;
1508         ct->task.post_select = command_post_select;
1509         ct->task.event_handler = NULL;
1510         ct->task.private_data = ct;
1511         ct->task.flags = 0;
1512         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1513         sprintf(ct->task.status, "command task");
1514 }
1515
1516 static void status_pre_select(struct sched *s, struct task *t)
1517 {
1518         struct status_task *st = t->private_data;
1519         t->ret = 1;
1520         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1521                 close_stat_pipe();
1522         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1523                 st->fd = open_stat_pipe();
1524                 st->loaded = 0;
1525                 st->buf[0] = '\0';
1526         }
1527         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1528                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1529 }
1530
1531 static void status_post_select(struct sched *s, struct task *t)
1532 {
1533         struct status_task *st = t->private_data;
1534         int ret;
1535
1536         t->ret = 1;
1537         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1538                 return;
1539         ret = read(st->fd, st->buf + st->loaded,
1540                 STRINGSIZE - 1 - st->loaded);
1541         if (ret <= 0) {
1542                 close_stat_pipe();
1543                 /* avoid busy loop if server is down */
1544                 while (sleep(1) > 0) /* FIXME */
1545                         ; /* try again*/
1546         } else {
1547                 st->buf[ret + st->loaded] = '\0';
1548                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1549                         &check_stat_line);
1550         }
1551 }
1552
1553 static void init_status_task(struct status_task *st)
1554 {
1555         st->task.pre_select = status_pre_select;
1556         st->task.post_select = status_post_select;
1557         st->task.private_data = st;
1558         st->task.flags = 0;
1559         st->loaded = 0;
1560         st->fd = -1;
1561         st->buf[0] = '\0';
1562         sprintf(st->task.status, "status task");
1563 }
1564
1565 static void set_initial_status(void)
1566 {
1567         audiod_status = AUDIOD_ON;
1568         if (!conf.mode_given)
1569                 return;
1570         if (!strcmp(conf.mode_arg, "sb")) {
1571                 audiod_status = AUDIOD_STANDBY;
1572                 return;
1573         }
1574         if (!strcmp(conf.mode_arg, "off")) {
1575                 audiod_status = AUDIOD_OFF;
1576                 return;
1577         }
1578         if (strcmp(conf.mode_arg, "on"))
1579                 PARA_WARNING_LOG("%s", "invalid mode\n");
1580 }
1581
1582 int main(int argc, char *argv[])
1583 {
1584         char *cf;
1585         int ret, i;
1586         struct sched s;
1587         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1588         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1589
1590         init_sched();
1591
1592         valid_fd_012();
1593         hostname = para_hostname();
1594         cmdline_parser(argc, argv, &conf);
1595         para_drop_privileges(conf.user_arg, conf.group_arg);
1596         cf = configfile_exists();
1597         if (cf) {
1598                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1599                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1600                         exit(EXIT_FAILURE);
1601                 }
1602         }
1603         if (conf.logfile_given)
1604                 logfile = open_log(conf.logfile_arg);
1605         log_welcome("para_audiod", conf.loglevel_arg);
1606         i = init_stream_io();
1607         if (i < 0) {
1608                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1609                 exit(EXIT_FAILURE);
1610         }
1611         server_uptime(UPTIME_SET);
1612         set_initial_status();
1613         FOR_EACH_SLOT(i)
1614                 clear_slot(i);
1615         init_grabbing();
1616         setup_signal_handling();
1617         signal_setup_default(sig_task);
1618         sig_task->task.event_handler = signal_event_handler;
1619
1620         init_status_task(stat_task);
1621         init_command_task(cmd_task);
1622         init_audiod_task(audiod_task);
1623
1624         if (conf.daemon_given)
1625                 daemon_init();
1626
1627         register_task(&sig_task->task);
1628         register_task(&cmd_task->task);
1629         register_task(&stat_task->task);
1630         register_task(audiod_task);
1631         s.default_timeout.tv_sec = 0;
1632         s.default_timeout.tv_usec = 99 * 1000;
1633         ret = sched(&s);
1634
1635         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1636         return EXIT_FAILURE;
1637 }