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