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, 200 * 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         /** do not restart client command until this time */
 141         struct timeval restart_barrier;
 142 };
 143 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 144
 145 struct signal_task {
 146         int fd;
 147         int signum;
 148         struct task task;
 149 };
 150
 151 /** defines one command of para_audiod */
 152 struct audiod_command {
 153         /** the name of the command */
 154         const char *name;
 155         /** pointer to the function that handles the command */
 156         int (*handler)(int, int, char**);
 157         /**
 158          * if the command prefers to handle the full line (rather than the usual
 159          * argv[] array), it stores a pointer to the corresponding line handling
 160          * function here. In this case, the above \a handler pointer must be NULL.
 161          */
 162         int (*line_handler)(int, char*);
 163         /** one-line description of the command */
 164         const char *description;
 165         /** summary of the command line options */
 166         const char *synopsis;
 167         /** the long help text */
 168         const char *help;
 169 };
 170 static int com_grab(int, char *);
 171 static int com_cycle(int, int, char **);
 172 static int com_help(int, int, char **);
 173 static int com_kill(int, int, char **);
 174 static int com_off(int, int, char **);
 175 static int com_on(int, int, char **);
 176 static int com_sb(int, int, char **);
 177 static int com_stat(int, int, char **);
 178 static int com_tasks(int, int, char **);
 179 static int com_term(int, int, char **);
 180 static struct audiod_command cmds[] = {
 181 {
 182 .name = "cycle",
 183 .handler = com_cycle,
 184 .description = "switch to next mode",
 185 .synopsis = "cycle",
 186 .help =
 187
 188 "on -> standby -> off -> on\n"
 189
 190 },
 191 {
 192 .name = "grab",
 193 .line_handler = com_grab,
 194 .description = "grab the audio stream",
 195 .synopsis = "-- grab [grab_options]",
 196 .help =
 197
 198 "grab ('splice') the audio stream at any position in the filter      \n"
 199 "chain and send that data back to the client. Try\n"
 200 "\t para_audioc -- grab -h\n"
 201 "for the list of available options.\n"
 202 },
 203
 204 {
 205 .name = "help",
 206 .handler = com_help,
 207 .description = "display command list or help for given command",
 208 .synopsis = "help [command]",
 209 .help =
 210
 211 "When I was younger, so much younger than today, I never needed\n"
 212 "anybody's help in any way. But now these days are gone, I'm not so\n"
 213 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 214 "\n"
 215 "                               -- Beatles: Help\n"
 216
 217 },
 218 {
 219 .name = "kill",
 220 .handler = com_kill,
 221 .description = "kill an active audiod task",
 222 .synopsis = "kill task_id [task_id ...]",
 223 .help =
 224
 225 "call sched_unregister() and the event_handler of the given task(s)\n"
 226
 227 },
 228 {
 229 .name = "off",
 230 .handler = com_off,
 231 .description = "deactivate para_audiod",
 232 .synopsis = "off",
 233 .help =
 234
 235 "Close connection to para_server and stop all decoders.\n"
 236
 237 },
 238 {
 239 .name = "on",
 240 .handler = com_on,
 241 .description = "activate para_audiod",
 242 .synopsis = "on",
 243 .help =
 244
 245 "Establish connection to para_server, retrieve para_server's current\n"
 246 "status. If playing, start corresponding decoder. Otherwise stop\n"
 247 "all decoders.\n"
 248
 249 },
 250 {
 251 .name = "sb",
 252 .handler = com_sb,
 253 .description = "enter standby mode",
 254 .synopsis = "sb",
 255 .help =
 256
 257 "Stop all decoders but leave connection to para_server open.\n"
 258
 259 },
 260 {
 261 .name = "stat",
 262 .handler = com_stat,
 263 .description = "print status information",
 264 .synopsis = "stat [item1 ...]",
 265 .help =
 266
 267 "Dump given status items (all if none given) to stdout.\n"
 268
 269 },
 270 {
 271 .name = "tasks",
 272 .handler = com_tasks,
 273 .description = "list current tasks",
 274 .synopsis = "tasks",
 275 .help =
 276
 277 "print the list of task ids together with the status of each task\n"
 278
 279 },
 280 {
 281 .name = "term",
 282 .handler = com_term,
 283 .description = "terminate audiod",
 284 .synopsis = "term",
 285 .help =
 286
 287 "Stop all decoders, shut down connection to para_server and exit.\n"
 288
 289 },
 290 {
 291 .name = NULL,
 292 }
 293 };
 294
 295 /** iterate over all slots */
 296 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 297 /** iterate over all supported audio formats */
 298 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 299 /** iterate over the array of all audiod commands */
 300 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 301
 302 /**
 303  * get the audio format number
 304  * \param name the name of the audio format
 305  *
 306  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 307  * \a name is not a supported audio format.
 308  */
 309 int get_audio_format_num(char *name)
 310 {
 311         int i;
 312         FOR_EACH_AUDIO_FORMAT(i)
 313                 if (!strcmp(name, audio_formats[i]))
 314                         return i;
 315         return -E_UNSUPPORTED_AUDIO_FORMAT;
 316 }
 317
 318 /*
 319  * log function. first argument is loglevel.
 320  */
 321 void para_log(int ll, const char* fmt,...)
 322 {
 323         va_list argp;
 324         FILE *outfd;
 325         struct tm *tm;
 326         time_t t1;
 327         char str[MAXLINE] = "";
 328
 329         if (ll < conf.loglevel_arg)
 330                 return;
 331         outfd = logfile? logfile : stderr;
 332         time(&t1);
 333         tm = localtime(&t1);
 334         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 335         fprintf(outfd, "%s %s ", str, hostname);
 336         if (conf.loglevel_arg <= INFO)
 337                 fprintf(outfd, "%i ", ll);
 338         va_start(argp, fmt);
 339         vfprintf(outfd, fmt, argp);
 340         va_end(argp);
 341 }
 342
 343 static int client_write(int fd, const char *buf)
 344 {
 345         size_t len = strlen(buf);
 346         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 347 }
 348
 349 static char *get_time_string(struct timeval *newest_stime)
 350 {
 351         struct timeval diff, adj_stream_start, tmp;
 352         int total = 0, use_server_time = 1;
 353
 354         if (!playing) {
 355                 if (length_seconds)
 356                         return NULL;
 357                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 358         }
 359         if (audiod_status == AUDIOD_OFF)
 360                 goto out;
 361         if (sa_time_diff_sign > 0)
 362                 tv_diff(&server_stream_start, &sa_time_diff,
 363                         &adj_stream_start);
 364         else
 365                 tv_add(&server_stream_start, &sa_time_diff,
 366                         &adj_stream_start);
 367         tmp = adj_stream_start;
 368         if (newest_stime && audiod_status == AUDIOD_ON) {
 369                 tv_diff(newest_stime, &adj_stream_start, &diff);
 370                 if (tv2ms(&diff) < 5000) {
 371                         tmp = *newest_stime;
 372                         use_server_time = 0;
 373                 }
 374         }
 375         tv_diff(now, &tmp, &diff);
 376         total = diff.tv_sec + offset_seconds;
 377         if (total > length_seconds)
 378                 total = length_seconds;
 379         if (total < 0)
 380                 total = 0;
 381 out:
 382         return make_message(
 383                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 384                 status_item_list[SI_PLAY_TIME],
 385                 use_server_time? "~" : "",
 386                 total / 60,
 387                 total % 60,
 388                 (length_seconds - total) / 60,
 389                 (length_seconds - total) % 60,
 390                 length_seconds? (total * 100 + length_seconds / 2) /
 391                         length_seconds : 0,
 392                 length_seconds / 60,
 393                 length_seconds % 60
 394         );
 395 }
 396
 397 __malloc static char *audiod_status_string(void)
 398 {
 399         const char *status = (audiod_status == AUDIOD_ON)?
 400                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 401         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 402 }
 403
 404 static struct timeval *wstime(void)
 405 {
 406         int i;
 407         struct timeval *max = NULL;
 408         FOR_EACH_SLOT(i) {
 409                 struct slot_info *s = &slot[i];
 410                 if (!s->wng)
 411                         continue;
 412                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 413                         continue;
 414                 max = &s->wstime;
 415         }
 416         return max;
 417 }
 418 __malloc static char *decoder_flags(void)
 419 {
 420         int i;
 421         char decoder_flags[MAX_STREAM_SLOTS + 1];
 422
 423         FOR_EACH_SLOT(i) {
 424                 struct slot_info *s = &slot[i];
 425                 char flag = '0';
 426                 if (s->receiver_node)
 427                         flag += 1;
 428                 if (s->wng)
 429                         flag += 2;
 430                 decoder_flags[i] = flag;
 431         }
 432         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 433         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 434                 decoder_flags);
 435 }
 436
 437 static char *configfile_exists(void)
 438 {
 439         static char *config_file;
 440
 441         if (!config_file) {
 442                 char *home = para_homedir();
 443                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 444                 free(home);
 445         }
 446         return file_exists(config_file)? config_file : NULL;
 447 }
 448
 449 static void setup_signal_handling(void)
 450 {
 451         sig_task->fd = para_signal_init();
 452         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 453         para_install_sighandler(SIGINT);
 454         para_install_sighandler(SIGTERM);
 455         para_install_sighandler(SIGCHLD);
 456         para_install_sighandler(SIGHUP);
 457         signal(SIGPIPE, SIG_IGN);
 458 }
 459
 460 static void audiod_status_dump(void)
 461 {
 462         static char *p_ts, *p_us, *p_as, *p_df;
 463         struct timeval *t = wstime();
 464         char *us, *tmp = get_time_string(t);
 465
 466         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 467                 stat_client_write(tmp, SI_PLAY_TIME);
 468         free(p_ts);
 469         p_ts = tmp;
 470
 471         us = uptime_str();
 472         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 473         free(us);
 474         if (!p_us || strcmp(p_us, tmp))
 475                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 476         free(p_us);
 477         p_us = tmp;
 478
 479         tmp = audiod_status_string();
 480         if (!p_as || strcmp(p_as, tmp))
 481                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 482         free(p_as);
 483         p_as = tmp;
 484
 485         tmp = decoder_flags();
 486         if (!p_df || strcmp(p_df, tmp))
 487                 stat_client_write(tmp, SI_DECODER_FLAGS);
 488         free(p_df);
 489         p_df = tmp;
 490 }
 491
 492 static void clear_slot(int slot_num)
 493 {
 494         struct slot_info *s = &slot[slot_num];
 495
 496         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 497         memset(s, 0, sizeof(struct slot_info));
 498         s->format = -1;
 499 }
 500
 501 static void close_receiver(int slot_num)
 502 {
 503         struct slot_info *s = &slot[slot_num];
 504         struct audio_format_info *a;
 505
 506         if (s->format < 0 || !s->receiver_node)
 507                 return;
 508         a = &afi[s->format];
 509         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 510                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 511 //      if (!s->receiver_node->eof)
 512 //              unregister_task(&s->receiver_node->task);
 513         a->receiver->close(s->receiver_node);
 514         free(s->receiver_node);
 515         s->receiver_node = NULL;
 516         /* set restart barrier */
 517         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 518 }
 519
 520 static void kill_all_decoders(void)
 521 {
 522         int i;
 523
 524         FOR_EACH_SLOT(i) {
 525                 struct slot_info *s = &slot[i];
 526                 if (s->wng && !s->wng->eof) {
 527                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 528                                 i);
 529                         wng_unregister(s->wng);
 530                         s->wng->eof = 1;
 531                 }
 532                 if (s->fc && !s->fc->eof) {
 533                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 534                         unregister_task(&s->fc->task);
 535                         s->fc->eof = 1;
 536                 }
 537                 if (s->receiver_node && !s->receiver_node->eof) {
 538                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 539                         unregister_task(&s->receiver_node->task);
 540                         s->receiver_node->eof = 1;
 541                 }
 542         }
 543 }
 544
 545 static int get_empty_slot(void)
 546 {
 547         int i;
 548         struct slot_info *s;
 549
 550         FOR_EACH_SLOT(i) {
 551                 s = &slot[i];
 552                 if (s->format < 0) {
 553                         clear_slot(i);
 554                         return i;
 555                 }
 556                 if (s->wng || s->receiver_node || s->fc)
 557                         continue;
 558                 clear_slot(i);
 559                 return i;
 560         }
 561         return -E_NO_MORE_SLOTS;
 562 }
 563
 564 static int decoder_running(int format)
 565 {
 566         int i, ret = 0;
 567         struct slot_info *s;
 568
 569         FOR_EACH_SLOT(i) {
 570                 s = &slot[i];
 571                 if (s->format == format && s->receiver_node)
 572                         ret |= 1;
 573                 if (s->format == format && s->wng)
 574                         ret |= 2;
 575         }
 576         return ret;
 577 }
 578
 579 static void close_stat_pipe(void)
 580 {
 581         int i;
 582
 583         if (stat_task->fd < 0)
 584                 return;
 585         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 586         close(stat_task->fd);
 587         del_close_on_fork_list(stat_task->fd);
 588         stat_task->fd = -1;
 589 //      kill_all_decoders();
 590         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 591                 free(stat_item_values[i]);
 592                 stat_item_values[i] = NULL;
 593         }
 594         dump_empty_status();
 595         length_seconds = 0;
 596         offset_seconds = 0;
 597         audiod_status_dump();
 598         playing = 0;
 599         stat_item_values[SI_STATUS_BAR] = make_message(
 600                 "%s:no connection to para_server\n",
 601                 status_item_list[SI_STATUS_BAR]);
 602         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 603 }
 604
 605 static void __noreturn clean_exit(int status, const char *msg)
 606 {
 607         PARA_EMERG_LOG("%s\n", msg);
 608         if (socket_name)
 609                 unlink(socket_name);
 610         if (stat_task->fd >= 0)
 611                 close_stat_pipe();
 612         exit(status);
 613 }
 614
 615 /**
 616  * get the number of filters
 617  *
 618  * \param audio_format_num the number identifying the audio format
 619  *
 620  * \return the number of filters for the given audio format
 621  *
 622  * \sa struct filter;
 623  */
 624 int num_filters(int audio_format_num)
 625 {
 626         return afi[audio_format_num].num_filters;
 627 }
 628
 629 static void filter_event_handler(struct task *t)
 630 {
 631         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 632         struct filter_chain *fc = t->private_data;
 633         fc->eof = 1;
 634         unregister_task(t);
 635 }
 636
 637 static void open_filters(int slot_num)
 638 {
 639         struct slot_info *s = &slot[slot_num];
 640         struct audio_format_info *a = &afi[s->format];
 641         int nf = a->num_filters;
 642         int i;
 643
 644         s->fc = NULL;
 645         if (!nf)
 646                 return;
 647         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 648         s->fc = para_calloc(sizeof(struct filter_chain));
 649         INIT_LIST_HEAD(&s->fc->filters);
 650         s->fc->inbuf = s->receiver_node->buf;
 651         s->fc->in_loaded = &s->receiver_node->loaded;
 652         s->fc->input_eof = &s->receiver_node->eof;
 653         s->fc->task.pre_select = filter_pre_select;
 654         s->fc->task.event_handler = filter_event_handler;
 655         s->fc->task.private_data = s->fc;
 656         s->fc->task.flags = 0;
 657         s->fc->eof = 0;
 658
 659         s->receiver_node->output_eof = &s->fc->eof;
 660         sprintf(s->fc->task.status, "filter chain");
 661         for (i = 0; i < nf; i++) {
 662                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 663                 fn->conf = a->filter_conf[i];
 664                 fn->fc = s->fc;
 665                 fn->filter = a->filters[i];
 666                 INIT_LIST_HEAD(&fn->callbacks);
 667                 list_add_tail(&fn->node, &s->fc->filters);
 668                 fn->filter->open(fn);
 669                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 670                         audio_formats[s->format], i + 1,  nf,
 671                         fn->filter->name, slot_num);
 672                 s->fc->outbuf = fn->buf;
 673                 s->fc->out_loaded = &fn->loaded;
 674         }
 675         register_task(&s->fc->task);
 676 }
 677
 678 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 679 {
 680         struct filter_node *fn;
 681         int i, j;
 682
 683         FOR_EACH_SLOT(i) {
 684                 struct slot_info *s = &slot[i];
 685                 if (s->format < 0 || !s->fc)
 686                         continue;
 687                 if (slot_num >= 0 && slot_num != i)
 688                         continue;
 689                 if (format >= 0 && s->format != format)
 690                         continue;
 691                 if (num_filters(i) < filternum)
 692                         continue;
 693                 /* success */
 694                 j = 1;
 695                 list_for_each_entry(fn, &s->fc->filters, node)
 696                         if (filternum <= 0 || j++ == filternum)
 697                                 break;
 698                 return fn;
 699         }
 700         return NULL;
 701 }
 702
 703 static void wng_event_handler(struct task *t)
 704 {
 705         struct writer_node_group *wng = t->private_data;
 706
 707         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 708         wng->eof = 1;
 709         wng_unregister(wng);
 710 }
 711
 712 static void open_writers(int slot_num)
 713 {
 714         int ret, i;
 715         struct slot_info *s = &slot[slot_num];
 716         struct audio_format_info *a = &afi[s->format];
 717
 718         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 719         if (!a->num_writers)
 720                 s->wng = setup_default_wng();
 721         else
 722                 s->wng = wng_new(a->num_writers);
 723         if (s->fc) {
 724                 s->wng->buf = s->fc->outbuf;
 725                 s->wng->loaded = s->fc->out_loaded;
 726                 s->wng->input_eof = &s->fc->eof;
 727                 s->wng->channels = &s->fc->channels;
 728                 s->wng->samplerate = &s->fc->samplerate;
 729                 s->fc->output_eof = &s->wng->eof;
 730                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 731         } else {
 732                 s->wng->buf = s->receiver_node->buf;
 733                 s->wng->loaded = &s->receiver_node->loaded;
 734                 s->wng->input_eof = &s->receiver_node->eof;
 735         }
 736         s->wng->task.event_handler = wng_event_handler;
 737         for (i = 0; i < a->num_writers; i++) {
 738                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 739                 s->wng->writer_nodes[i].writer = a->writers[i];
 740                 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
 741         }
 742         ret = wng_open(s->wng);
 743         if (ret < 0) {
 744                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 745                 return;
 746         }
 747         s->wstime = *now;
 748         current_decoder = slot_num;
 749         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 750 }
 751
 752 static void rn_event_handler(struct task *t)
 753 {
 754         struct receiver_node *rn = t->private_data;
 755
 756         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 757         unregister_task(t);
 758         rn->eof = 1;
 759 }
 760
 761 static void open_receiver(int format)
 762 {
 763         struct audio_format_info *a = &afi[format];
 764         struct slot_info *s;
 765         int ret, slot_num;
 766         struct receiver_node *rn;
 767
 768         slot_num = get_empty_slot();
 769         if (slot_num < 0)
 770                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 771         s = &slot[slot_num];
 772         s->format = format;
 773         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 774         rn = s->receiver_node;
 775         rn->receiver = a->receiver;
 776         rn->conf = a->receiver_conf;
 777         ret = a->receiver->open(s->receiver_node);
 778         if (ret < 0) {
 779                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 780                         PARA_STRERROR(-ret));
 781                 free(s->receiver_node);
 782                 s->receiver_node = NULL;
 783                 return;
 784         }
 785         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 786                 audio_formats[s->format], a->receiver->name, slot_num);
 787         rn->task.private_data = s->receiver_node;
 788         rn->task.pre_select = a->receiver->pre_select;
 789         rn->task.post_select = a->receiver->post_select;
 790         rn->task.event_handler = rn_event_handler;
 791         rn->task.flags = 0;
 792         sprintf(rn->task.status, "receiver node");
 793         register_task(&rn->task);
 794 }
 795
 796 static int is_frozen(int format)
 797 {
 798         struct audio_format_info *a = &afi[format];
 799
 800         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 801 }
 802
 803 static void open_current_receiver(struct sched *s)
 804 {
 805         int i;
 806
 807         if (!af_status)
 808                 return;
 809         i = get_audio_format_num(af_status);
 810         if (i < 0)
 811                 return;
 812         if (decoder_running(i) || is_frozen(i))
 813                 return;
 814         open_receiver(i);
 815         /*
 816          * the receiver didn't get a chance to put his fd to the fd set.
 817          * Make the upcoming select() return immediately to avoid a long
 818          * timeout.
 819          */
 820         s->timeout.tv_sec = 0;
 821         s->timeout.tv_usec = 1;
 822 }
 823
 824 static void compute_time_diff(const struct timeval *status_time)
 825 {
 826         struct timeval tmp, diff;
 827         static int count;
 828         int sign;
 829         const struct timeval max_deviation = {0, 500 * 1000};
 830         const int time_smooth = 5;
 831
 832         sign = tv_diff(status_time, now, &diff);
 833 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 834 //                      sign, sa_time_diff_sign);
 835         if (!count) {
 836                 sa_time_diff_sign = sign;
 837                 sa_time_diff = diff;
 838                 count++;
 839                 return;
 840         }
 841         if (count > 5) {
 842                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 843                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 844                         PARA_WARNING_LOG("time diff jump: %lims\n",
 845                                 s * tv2ms(&tmp));
 846         }
 847         count++;
 848         sa_time_diff_sign = tv_convex_combination(
 849                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 850                 count > 10? sign : sign * time_smooth, &diff,
 851                 &tmp);
 852         sa_time_diff = tmp;
 853         PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 854                 sign > 0? "+" : "-",
 855                 tv2ms(&diff),
 856                 sa_time_diff_sign ? "+" : "-",
 857                 tv2ms(&sa_time_diff)
 858         );
 859 }
 860
 861 static void check_stat_line(char *line)
 862 {
 863         int itemnum;
 864         size_t ilen = 0;
 865         long unsigned sec, usec;
 866         char *tmp;
 867
 868 //      PARA_INFO_LOG("line: %s\n", line);
 869         if (!line)
 870                 return;
 871         itemnum = stat_line_valid(line);
 872         if (itemnum < 0) {
 873                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 874                 return;
 875         }
 876         tmp = make_message("%s\n", line);
 877         stat_client_write(tmp, itemnum);
 878         free(tmp);
 879         free(stat_item_values[itemnum]);
 880         stat_item_values[itemnum] = para_strdup(line);
 881         ilen = strlen(status_item_list[itemnum]);
 882         switch (itemnum) {
 883         case SI_STATUS:
 884                 playing = strstr(line, "playing")? 1 : 0;
 885                 break;
 886         case SI_FORMAT:
 887                 free(af_status);
 888                 af_status = para_strdup(line + ilen + 1);
 889                 break;
 890         case SI_OFFSET:
 891                 offset_seconds = atoi(line + ilen + 1);
 892                 break;
 893         case SI_LENGTH:
 894                 length_seconds = atoi(line + ilen + 1);
 895                 break;
 896         case SI_STREAM_START:
 897                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 898                         server_stream_start.tv_sec = sec;
 899                         server_stream_start.tv_usec = usec;
 900                 }
 901                 break;
 902         case SI_CURRENT_TIME:
 903                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 904                         struct timeval tv = {sec, usec};
 905                         compute_time_diff(&tv);
 906                 }
 907                 break;
 908         }
 909 }
 910
 911 static void handle_signal(int sig)
 912 {
 913         switch (sig) {
 914         case SIGCHLD:
 915                 for (;;) {
 916                         pid_t pid = para_reap_child();
 917                         if (pid <= 0)
 918                                 return;
 919                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 920                 }
 921         case SIGINT:
 922         case SIGTERM:
 923         case SIGHUP:
 924                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 925                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 926                 return;
 927         }
 928 }
 929
 930 static void try_to_close_slot(int slot_num)
 931 {
 932         struct slot_info *s = &slot[slot_num];
 933
 934         if (s->format < 0)
 935                 return;
 936         if (s->receiver_node && !s->receiver_node->eof)
 937                 return;
 938         if (s->fc && !s->fc->eof)
 939                 return;
 940         if (s->wng && !s->wng->eof)
 941                 return;
 942         PARA_INFO_LOG("closing slot %d \n", slot_num);
 943         wng_close(s->wng);
 944         close_filters(s->fc);
 945         free(s->fc);
 946         close_receiver(slot_num);
 947         clear_slot(slot_num);
 948 }
 949
 950 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 951 {
 952         int i;
 953
 954         t->ret = 1;
 955         now = &s->now;
 956         if (audiod_status != AUDIOD_ON || !playing)
 957                 kill_all_decoders();
 958         else if (playing)
 959                 open_current_receiver(s);
 960         FOR_EACH_SLOT(i) {
 961                 struct slot_info *s = &slot[i];
 962                 struct audio_format_info *a;
 963
 964                 if (s->format < 0)
 965                         continue;
 966                 a = &afi[s->format];
 967                 if (!s->receiver_node)
 968                         continue;
 969                 if (!a->num_filters) {
 970                         if (s->receiver_node->loaded && !s->wng)
 971                                 open_writers(i);
 972                         continue;
 973                 }
 974                 if (s->receiver_node->loaded && !s->fc) {
 975                         open_filters(i);
 976                         continue;
 977                 }
 978                 if (s->fc && *s->fc->out_loaded && !s->wng)
 979                         open_writers(i);
 980         }
 981 }
 982
 983 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 984 {
 985         int i;
 986
 987         /* save away the current time for other users */
 988         now = &s->now;
 989         t->ret = 1;
 990         FOR_EACH_SLOT(i)
 991                 try_to_close_slot(i);
 992 }
 993
 994 static void init_audiod_task(struct task *t)
 995 {
 996         t->pre_select = audiod_pre_select;
 997         t->post_select = audiod_post_select;
 998         t->event_handler = NULL;
 999         t->private_data = t;
1000         t->flags = 0;
1001         sprintf(t->status, "audiod task");
1002 }
1003
1004 static int parse_stream_command(const char *txt, char **cmd)
1005 {
1006         char *p = strchr(txt, ':');
1007         int i;
1008
1009         if (!p)
1010                 return -E_MISSING_COLON;
1011         p++;
1012         FOR_EACH_AUDIO_FORMAT(i) {
1013                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1014                         continue;
1015                 *cmd = p;
1016                 return i;
1017         }
1018         return -E_UNSUPPORTED_AUDIO_FORMAT;
1019 }
1020
1021 static int add_filter(int format, char *cmdline)
1022 {
1023         struct audio_format_info *a = &afi[format];
1024         int filter_num, nf = a->num_filters;
1025
1026         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1027         if (filter_num < 0)
1028                 return filter_num;
1029         a->filters[nf] = &filters[filter_num];
1030         a->num_filters++;
1031         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1032                 a->filters[nf]->name);
1033         return filter_num;
1034 }
1035
1036 static int init_writers(void)
1037 {
1038         int i, ret, nw;
1039         char *cmd;
1040         struct audio_format_info *a;
1041
1042         init_supported_writers();
1043         nw = PARA_MAX(1, conf.writer_given);
1044         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
1045         FOR_EACH_AUDIO_FORMAT(i) {
1046                 a = &afi[i];
1047                 a->writer_conf = para_malloc(nw * sizeof(void *));
1048                 a->writers = para_malloc(nw * sizeof(struct writer *));
1049                 a->num_writers = 0;
1050         }
1051         for (i = 0; i < conf.writer_given; i++) {
1052                 void *wconf;
1053                 int writer_num;
1054                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1055                 if (ret < 0)
1056                         goto out;
1057                 a = &afi[ret];
1058                 nw = a->num_writers;
1059                 wconf = check_writer_arg(cmd, &writer_num);
1060                 if (!wconf) {
1061                         ret = writer_num;
1062                         goto out;
1063                 }
1064                 a->writers[nw] = &writers[writer_num];
1065                 a->writer_conf[nw] = wconf;
1066                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1067                         nw, writer_names[writer_num]);
1068                 a->num_writers++;
1069         }
1070         ret = 1;
1071 out:
1072         return ret;
1073 }
1074
1075 static int init_receivers(void)
1076 {
1077         int i, ret, receiver_num;
1078         char *cmd = NULL;
1079         struct audio_format_info *a;
1080
1081         for (i = 0; receivers[i].name; i++) {
1082                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1083                 receivers[i].init(&receivers[i]);
1084         }
1085         for (i = 0; i < conf.receiver_given; i++) {
1086                 char *arg = conf.receiver_arg[i];
1087                 char *recv = strchr(arg, ':');
1088                 ret = -E_MISSING_COLON;
1089                 if (!recv)
1090                         goto out;
1091                 *recv = '\0';
1092                 recv++;
1093                 ret = get_audio_format_num(arg);
1094                 if (ret < 0)
1095                         goto out;
1096                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1097                 if (!afi[ret].receiver_conf) {
1098                         ret = -E_RECV_SYNTAX;
1099                         goto out;
1100                 }
1101                 afi[ret].receiver = &receivers[receiver_num];
1102         }
1103         /* use the first available receiver with no arguments
1104          * for those audio formats for which no receiver
1105          * was specified
1106          */
1107         cmd = para_strdup(receivers[0].name);
1108         FOR_EACH_AUDIO_FORMAT(i) {
1109                 a = &afi[i];
1110                 if (a->receiver_conf)
1111                         continue;
1112                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1113                 if (!a->receiver_conf)
1114                         return -E_RECV_SYNTAX;
1115                 a->receiver = &receivers[receiver_num];
1116         }
1117         ret = 1;
1118 out:
1119         free(cmd);
1120         return ret;
1121 }
1122
1123 static int init_default_filters(void)
1124 {
1125         int i, ret = 1;
1126
1127         FOR_EACH_AUDIO_FORMAT(i) {
1128                 struct audio_format_info *a = &afi[i];
1129                 char *tmp;
1130                 int j;
1131
1132                 if (a->num_filters)
1133                         continue; /* no default -- nothing to to */
1134                 /* add "dec" to audio format name */
1135                 tmp = make_message("%sdec", audio_formats[i]);
1136                 for (j = 0; filters[j].name; j++)
1137                         if (!strcmp(tmp, filters[j].name))
1138                                 break;
1139                 free(tmp);
1140                 ret = -E_UNSUPPORTED_FILTER;
1141                 if (!filters[j].name)
1142                         goto out;
1143                 tmp = para_strdup(filters[j].name);
1144                 ret = add_filter(i, tmp);
1145                 free(tmp);
1146                 if (ret < 0)
1147                         goto out;
1148                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1149                         filters[j].name);
1150         }
1151 out:
1152         return ret;
1153 }
1154
1155 static int init_filters(void)
1156 {
1157         int i, ret, nf;
1158
1159         filter_init(filters);
1160         nf = PARA_MAX(1,  conf.filter_given);
1161         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1162         FOR_EACH_AUDIO_FORMAT(i) {
1163                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1164                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1165         }
1166         if (!conf.no_default_filters_given)
1167                 return init_default_filters();
1168         for (i = 0; i < conf.filter_given; i++) {
1169                 char *arg = conf.filter_arg[i];
1170                 char *filter_name = strchr(arg, ':');
1171                 ret = -E_MISSING_COLON;
1172                 if (!filter_name)
1173                         goto out;
1174                 *filter_name = '\0';
1175                 filter_name++;
1176                 ret = get_audio_format_num(arg);
1177                 if (ret < 0)
1178                         goto out;
1179                 ret = add_filter(ret, filter_name);
1180                 if (ret < 0)
1181                         goto out;
1182         }
1183         ret = init_default_filters(); /* use default values for the rest */
1184 out:
1185         return ret;
1186 }
1187
1188 static int init_stream_io(void)
1189 {
1190         int ret;
1191
1192         ret = init_writers();
1193         if (ret < 0)
1194                 return ret;
1195         ret = init_receivers();
1196         if (ret < 0)
1197                 return ret;
1198         ret = init_filters();
1199         if (ret < 0)
1200                 return ret;
1201         return 1;
1202 }
1203
1204 static int dump_commands(int fd)
1205 {
1206         char *buf = para_strdup(""), *tmp = NULL;
1207         int i;
1208         ssize_t ret;
1209
1210         FOR_EACH_COMMAND(i) {
1211                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1212                         cmds[i].description);
1213                 free(buf);
1214                 buf = tmp;
1215         }
1216         ret = client_write(fd, buf);
1217         free(buf);
1218         return ret;
1219 }
1220
1221 /*
1222  * command handlers don't close their fd on errors (ret < 0) so that
1223  * its caller can send an error message. Otherwise (ret >= 0) it's up
1224  * to each individual command to close the fd if necessary.
1225  */
1226
1227 static int com_help(int fd, int argc, char **argv)
1228 {
1229         int i, ret;
1230         char *buf;
1231         const char *dflt = "No such command. Available commands:\n";
1232
1233         if (argc < 2) {
1234                 ret = dump_commands(fd);
1235                 goto out;
1236         }
1237         FOR_EACH_COMMAND(i) {
1238                 if (strcmp(cmds[i].name, argv[1]))
1239                         continue;
1240                 buf = make_message(
1241                         "NAME\n\t%s -- %s\n"
1242                         "SYNOPSIS\n\tpara_audioc %s\n"
1243                         "DESCRIPTION\n%s\n",
1244                         argv[1],
1245                         cmds[i].description,
1246                         cmds[i].synopsis,
1247                         cmds[i].help
1248                 );
1249                 ret = client_write(fd, buf);
1250                 free(buf);
1251                 goto out;
1252         }
1253         ret = client_write(fd, dflt);
1254         if (ret > 0)
1255                 ret = dump_commands(fd);
1256 out:
1257         if (ret >= 0)
1258                 close(fd);
1259         return ret;
1260 }
1261
1262 static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
1263 {
1264         char *tl = get_task_list();
1265         int ret = 1;
1266         if (tl)
1267                 ret = client_write(fd, tl);
1268         free(tl);
1269         if (ret > 0)
1270                 close(fd);
1271         return ret;
1272 }
1273
1274 static int com_kill(int fd, int argc, char **argv)
1275 {
1276         int i, ret = 1;
1277         if (argc < 2)
1278                 return -E_AUDIOD_SYNTAX;
1279         for (i = 1; i < argc; i++) {
1280                 ret = kill_task(argv[i]);
1281                 if (ret < 0)
1282                         break;
1283         }
1284         if (ret > 0)
1285                 close(fd);
1286         return ret;
1287 }
1288
1289 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1290 {
1291         int i, ret;
1292         char *buf = NULL;
1293         long unsigned mask = ~0LU;
1294
1295         if (argc > 1) {
1296                 mask = 0;
1297                 for (i = 1; i < argc; i++) {
1298                         ret = stat_item_valid(argv[i]);
1299                         if (ret < 0)
1300                                 return ret;
1301                         mask |= (1 << ret);
1302                 }
1303         }
1304         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1305         if (mask & (1 << SI_PLAY_TIME)) {
1306                 struct timeval *t = wstime();
1307                 char *ts = get_time_string(t);
1308                 if (ts) {
1309                         ret = client_write(fd, ts);
1310                         if (ret < 0)
1311                                 goto out;
1312                         free(ts);
1313                 }
1314         }
1315         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1316                 char *tmp, *us = uptime_str();
1317                 tmp = make_message("%s:%s\n",
1318                         status_item_list[SI_AUDIOD_UPTIME], us);
1319                 free(us);
1320                 ret = client_write(fd, tmp);
1321                 if (ret < 0)
1322                         goto out;
1323                 free(tmp);
1324         }
1325         if (mask & (1 << SI_AUDIOD_STATUS)) {
1326                 char *s = audiod_status_string();
1327                 ret = client_write(fd, s);
1328                 if (ret < 0)
1329                         goto out;
1330                 free(s);
1331         }
1332         if (mask & (1 << SI_DECODER_FLAGS)) {
1333                 char *df =decoder_flags();
1334                 ret = client_write(fd, df);
1335                 if (ret < 0)
1336                         goto out;
1337                 free(df);
1338         }
1339
1340         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1341                 char *tmp, *v;
1342                 if (!((1 << i) & mask))
1343                         continue;
1344                 v = stat_item_values[i];
1345                 tmp = make_message("%s%s%s", buf? buf: "",
1346                         v? v : "", v? "\n" : "");
1347                 free(buf);
1348                 buf = tmp;
1349         }
1350         ret = client_write(fd, buf);
1351 out:
1352         if (ret > 0)
1353                 ret = stat_client_add(fd, mask);
1354         free(buf);
1355         return ret;
1356 }
1357
1358 static int com_grab(int fd, char *cmdline)
1359 {
1360         struct grab_client *gc;
1361         struct filter_node *fn;
1362         int i, err;
1363         char *msg;
1364
1365         gc = grab_client_new(fd, cmdline, &err);
1366         if (!gc)
1367                 goto err_out;
1368         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1369         if (fn)
1370                 activate_grab_client(gc, fn);
1371         return 1;
1372 err_out:
1373         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1374                 return err;
1375         if (err == -E_GC_HELP_GIVEN) {
1376                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1377                 for (i = 0; grab_client_args_info_help[i]; i++) {
1378                         char *tmp = make_message("%s%s\n", msg,
1379                                 grab_client_args_info_help[i]);
1380                         free(msg);
1381                         msg = tmp;
1382                 }
1383         } else
1384                 msg = make_message("%s %s\n",
1385                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1386                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1387         err = client_write(fd, msg);
1388         free(msg);
1389         if (err < 0)
1390                 return err;
1391         close(fd);
1392         return 1;
1393 }
1394
1395 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1396 {
1397         close(fd);
1398         clean_exit(EXIT_SUCCESS, "terminating on user request");
1399 }
1400
1401 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1402 {
1403         audiod_status = AUDIOD_ON;
1404         close(fd);
1405         return 1;
1406 }
1407
1408 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1409 {
1410         audiod_status = AUDIOD_OFF;
1411         close(fd);
1412         return 1;
1413 }
1414
1415 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1416 {
1417         audiod_status = AUDIOD_STANDBY;
1418         close(fd);
1419         return 1;
1420 }
1421
1422 static int com_cycle(int fd, int argc, char **argv)
1423 {
1424         switch (audiod_status) {
1425                 case  AUDIOD_ON:
1426                         return com_sb(fd, argc, argv);
1427                         break;
1428                 case  AUDIOD_OFF:
1429                         return com_on(fd, argc, argv);
1430                         break;
1431                 case  AUDIOD_STANDBY:
1432                         return com_off(fd, argc, argv);
1433                         break;
1434         }
1435         close(fd);
1436         return 1;
1437 }
1438
1439 static int check_perms(uid_t uid)
1440 {
1441         int i;
1442
1443         if (!conf.user_allow_given)
1444                 return 1;
1445         for (i = 0; i < conf.user_allow_given; i++)
1446                 if (uid == conf.user_allow_arg[i])
1447                         return 1;
1448         return -E_UCRED_PERM;
1449 }
1450
1451 static int handle_connect(int accept_fd)
1452 {
1453         int i, argc, ret, clifd = -1;
1454         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1455         struct sockaddr_un unix_addr;
1456
1457         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
1458         if (ret < 0)
1459                 goto out;
1460         clifd = ret;
1461         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1462         if (ret < 0)
1463                 goto out;
1464         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1465         ret = check_perms(ret);
1466         if (ret < 0)
1467                 goto out;
1468         ret = -E_INVALID_AUDIOD_CMD;
1469         cmd = para_strdup(buf);
1470         p = strchr(cmd, '\n');
1471         if (!p)
1472                 p = "";
1473         else {
1474                 *p = '\0';
1475                 p++;
1476         }
1477         for (i = 0; cmds[i].name; i++) {
1478                 int j;
1479                 if (strcmp(cmds[i].name, cmd))
1480                         continue;
1481                 if (cmds[i].handler) {
1482                         argc = split_args(buf, &argv, "\n");
1483                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1484                         ret = cmds[i].handler(clifd, argc, argv);
1485                         goto out;
1486                 }
1487                 for (j = 0; p[j]; j++)
1488                         if (p[j] == '\n')
1489                                 p[j] = ' ';
1490                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1491                 ret = cmds[i].line_handler(clifd, p);
1492                 goto out;
1493         }
1494         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1495 out:
1496         free(cmd);
1497         free(buf);
1498         free(argv);
1499         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1500                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1501                 client_write(clifd, tmp);
1502                 free(tmp);
1503                 close(clifd);
1504         }
1505         return ret;
1506 }
1507
1508 static int audiod_get_socket(void)
1509 {
1510         struct sockaddr_un unix_addr;
1511         int fd;
1512
1513         if (conf.socket_given)
1514                 socket_name = para_strdup(conf.socket_arg);
1515         else {
1516                 char *hn = para_hostname();
1517                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1518                         hn);
1519                 free(hn);
1520         }
1521         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1522         if (conf.force_given)
1523                 unlink(socket_name);
1524         fd = create_pf_socket(socket_name, &unix_addr,
1525                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1526         if (fd < 0) {
1527                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1528                 exit(EXIT_FAILURE); /* do not unlink socket */
1529         }
1530         if (listen(fd , 5) < 0) {
1531                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1532                 exit(EXIT_FAILURE); /* do not unlink socket */
1533         }
1534         add_close_on_fork_list(fd);
1535         return fd;
1536 }
1537
1538 static int open_stat_pipe(void)
1539 {
1540         int ret, fd[3] = {-1, 1, 0};
1541         pid_t pid;
1542         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1543         if (ret >= 0) {
1544                 ret = fd[1];
1545                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1546                 add_close_on_fork_list(ret);
1547         } else
1548                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1549         return ret;
1550 }
1551
1552 void signal_event_handler(struct task *t)
1553 {
1554         struct signal_task *st = t->private_data;
1555
1556         if (t->ret != -E_SIGNAL_CAUGHT)
1557                 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
1558         else
1559                 handle_signal(st->signum);
1560 }
1561
1562 void signal_pre_select(struct sched *s, struct task *t)
1563 {
1564         struct signal_task *st = t->private_data;
1565         t->ret = 1;
1566         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1567 }
1568
1569 void signal_post_select(struct sched *s, struct task *t)
1570 {
1571         struct signal_task *st = t->private_data;
1572         t->ret = 1;
1573         if (!FD_ISSET(st->fd, &s->rfds))
1574                 return;
1575         t->ret = -E_SIGNAL_CAUGHT;
1576         st->signum = para_next_signal();
1577 }
1578
1579 void signal_setup_default(struct signal_task *st)
1580 {
1581         st->task.pre_select = signal_pre_select;
1582         st->task.post_select = signal_post_select;
1583         st->task.private_data = st;
1584         st->task.flags = 0;
1585         sprintf(st->task.status, "signal task");
1586 }
1587
1588 static void command_pre_select(struct sched *s, struct task *t)
1589 {
1590         struct command_task *ct = t->private_data;
1591         t->ret = 1;
1592         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1593
1594 }
1595
1596 static void command_post_select(struct sched *s, struct task *t)
1597 {
1598         int ret;
1599         struct command_task *ct = t->private_data;
1600
1601         t->ret = 1; /* always successful */
1602         if (audiod_status != AUDIOD_OFF)
1603                 audiod_status_dump();
1604         if (!FD_ISSET(ct->fd, &s->rfds))
1605                 return;
1606         ret = handle_connect(ct->fd);
1607         if (ret < 0)
1608                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1609 }
1610
1611 static void init_command_task(struct command_task *ct)
1612 {
1613         ct->task.pre_select = command_pre_select;
1614         ct->task.post_select = command_post_select;
1615         ct->task.event_handler = NULL;
1616         ct->task.private_data = ct;
1617         ct->task.flags = 0;
1618         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1619         sprintf(ct->task.status, "command task");
1620 }
1621
1622 static void status_event_handler(__a_unused struct task *t)
1623 {
1624         struct timeval delay = {1, 0};
1625         int i;
1626         struct status_task *st = t->private_data;
1627
1628         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
1629         close_stat_pipe();
1630         /* avoid busy loop if server is down */
1631         tv_add(now, &delay, &st->restart_barrier);
1632         FOR_EACH_AUDIO_FORMAT(i)
1633                 afi[i].restart_barrier = st->restart_barrier;
1634 }
1635
1636 static void status_pre_select(struct sched *s, struct task *t)
1637 {
1638         struct status_task *st = t->private_data;
1639         t->ret = 1;
1640         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1641                 close_stat_pipe();
1642         if (st->fd < 0 && audiod_status != AUDIOD_OFF
1643                 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
1644                 st->fd = open_stat_pipe();
1645                 st->loaded = 0;
1646                 st->buf[0] = '\0';
1647         }
1648         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1649                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1650 }
1651
1652 static void status_post_select(struct sched *s, struct task *t)
1653 {
1654         struct status_task *st = t->private_data;
1655
1656         t->ret = 1;
1657         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1658                 return;
1659         t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1660         if (t->ret <= 0) {
1661                 if (!t->ret)
1662                         t->ret = -E_STATUS_EOF;
1663                 return;
1664         }
1665         st->buf[t->ret + st->loaded] = '\0';
1666         st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1667                 &check_stat_line);
1668 }
1669
1670 static void init_status_task(struct status_task *st)
1671 {
1672         memset(st, 0, sizeof(struct status_task));
1673         st->task.pre_select = status_pre_select;
1674         st->task.post_select = status_post_select;
1675         st->task.event_handler = status_event_handler;
1676         st->task.private_data = st;
1677         st->fd = -1;
1678         sprintf(st->task.status, "status task");
1679 }
1680
1681 static void set_initial_status(void)
1682 {
1683         audiod_status = AUDIOD_ON;
1684         if (!conf.mode_given)
1685                 return;
1686         if (!strcmp(conf.mode_arg, "sb")) {
1687                 audiod_status = AUDIOD_STANDBY;
1688                 return;
1689         }
1690         if (!strcmp(conf.mode_arg, "off")) {
1691                 audiod_status = AUDIOD_OFF;
1692                 return;
1693         }
1694         if (strcmp(conf.mode_arg, "on"))
1695                 PARA_WARNING_LOG("%s", "invalid mode\n");
1696 }
1697
1698 int main(int argc, char *argv[])
1699 {
1700         char *cf;
1701         int ret, i;
1702         struct sched s;
1703         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1704         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1705
1706         init_sched();
1707
1708         valid_fd_012();
1709         hostname = para_hostname();
1710         cmdline_parser(argc, argv, &conf);
1711         para_drop_privileges(conf.user_arg, conf.group_arg);
1712         cf = configfile_exists();
1713         if (cf) {
1714                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1715                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1716                         exit(EXIT_FAILURE);
1717                 }
1718         }
1719         if (conf.logfile_given)
1720                 logfile = open_log(conf.logfile_arg);
1721         log_welcome("para_audiod", conf.loglevel_arg);
1722         i = init_stream_io();
1723         if (i < 0) {
1724                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1725                 exit(EXIT_FAILURE);
1726         }
1727         server_uptime(UPTIME_SET);
1728         set_initial_status();
1729         FOR_EACH_SLOT(i)
1730                 clear_slot(i);
1731         init_grabbing();
1732         setup_signal_handling();
1733         signal_setup_default(sig_task);
1734         sig_task->task.event_handler = signal_event_handler;
1735
1736         init_status_task(stat_task);
1737         init_command_task(cmd_task);
1738         init_audiod_task(audiod_task);
1739
1740         if (conf.daemon_given)
1741                 daemon_init();
1742
1743         register_task(&sig_task->task);
1744         register_task(&cmd_task->task);
1745         register_task(&stat_task->task);
1746         register_task(audiod_task);
1747         s.default_timeout.tv_sec = 3;
1748         s.default_timeout.tv_usec = 99 * 1000;
1749         ret = sched(&s);
1750
1751         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1752         return EXIT_FAILURE;
1753 }