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         para_install_sighandler(SIGPIPE);
 458 //      signal(SIGPIPE, SIG_IGN);
 459 }
 460
 461 static void audiod_status_dump(void)
 462 {
 463         static char *p_ts, *p_us, *p_as, *p_df;
 464         struct timeval *t = wstime();
 465         char *us, *tmp = get_time_string(t);
 466
 467         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 468                 stat_client_write(tmp, SI_PLAY_TIME);
 469         free(p_ts);
 470         p_ts = tmp;
 471
 472         us = uptime_str();
 473         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 474         free(us);
 475         if (!p_us || strcmp(p_us, tmp))
 476                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 477         free(p_us);
 478         p_us = tmp;
 479
 480         tmp = audiod_status_string();
 481         if (!p_as || strcmp(p_as, tmp))
 482                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 483         free(p_as);
 484         p_as = tmp;
 485
 486         tmp = decoder_flags();
 487         if (!p_df || strcmp(p_df, tmp))
 488                 stat_client_write(tmp, SI_DECODER_FLAGS);
 489         free(p_df);
 490         p_df = tmp;
 491 }
 492
 493 static void clear_slot(int slot_num)
 494 {
 495         struct slot_info *s = &slot[slot_num];
 496
 497         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 498         memset(s, 0, sizeof(struct slot_info));
 499         s->format = -1;
 500 }
 501
 502 static void close_receiver(int slot_num)
 503 {
 504         struct slot_info *s = &slot[slot_num];
 505         struct audio_format_info *a;
 506
 507         if (s->format < 0 || !s->receiver_node)
 508                 return;
 509         a = &afi[s->format];
 510         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 511                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 512 //      if (!s->receiver_node->eof)
 513 //              unregister_task(&s->receiver_node->task);
 514         a->receiver->close(s->receiver_node);
 515         free(s->receiver_node);
 516         s->receiver_node = NULL;
 517         /* set restart barrier */
 518         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 519 }
 520
 521 static void kill_all_decoders(void)
 522 {
 523         int i;
 524
 525         FOR_EACH_SLOT(i) {
 526                 struct slot_info *s = &slot[i];
 527                 if (s->wng && !s->wng->eof) {
 528                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 529                                 i);
 530                         wng_unregister(s->wng);
 531                         s->wng->eof = 1;
 532                 }
 533                 if (s->fc && !s->fc->eof) {
 534                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 535                         unregister_task(&s->fc->task);
 536                         s->fc->eof = 1;
 537                 }
 538                 if (s->receiver_node && !s->receiver_node->eof) {
 539                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 540                         unregister_task(&s->receiver_node->task);
 541                         s->receiver_node->eof = 1;
 542                 }
 543         }
 544 }
 545
 546 static int get_empty_slot(void)
 547 {
 548         int i;
 549         struct slot_info *s;
 550
 551         FOR_EACH_SLOT(i) {
 552                 s = &slot[i];
 553                 if (s->format < 0) {
 554                         clear_slot(i);
 555                         return i;
 556                 }
 557                 if (s->wng || s->receiver_node || s->fc)
 558                         continue;
 559                 clear_slot(i);
 560                 return i;
 561         }
 562         return -E_NO_MORE_SLOTS;
 563 }
 564
 565 static int decoder_running(int format)
 566 {
 567         int i, ret = 0;
 568         struct slot_info *s;
 569
 570         FOR_EACH_SLOT(i) {
 571                 s = &slot[i];
 572                 if (s->format == format && s->receiver_node)
 573                         ret |= 1;
 574                 if (s->format == format && s->wng)
 575                         ret |= 2;
 576         }
 577         return ret;
 578 }
 579
 580 static void close_stat_pipe(void)
 581 {
 582         int i;
 583
 584         if (stat_task->fd < 0)
 585                 return;
 586         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 587         close(stat_task->fd);
 588         del_close_on_fork_list(stat_task->fd);
 589         stat_task->fd = -1;
 590 //      kill_all_decoders();
 591         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 592                 free(stat_item_values[i]);
 593                 stat_item_values[i] = NULL;
 594         }
 595         dump_empty_status();
 596         length_seconds = 0;
 597         offset_seconds = 0;
 598         audiod_status_dump();
 599         playing = 0;
 600         stat_item_values[SI_STATUS_BAR] = make_message(
 601                 "%s:no connection to para_server\n",
 602                 status_item_list[SI_STATUS_BAR]);
 603         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 604 }
 605
 606 static void __noreturn clean_exit(int status, const char *msg)
 607 {
 608         PARA_EMERG_LOG("%s\n", msg);
 609         if (socket_name)
 610                 unlink(socket_name);
 611         if (stat_task->fd >= 0)
 612                 close_stat_pipe();
 613         exit(status);
 614 }
 615
 616 /**
 617  * get the number of filters
 618  *
 619  * \param audio_format_num the number identifying the audio format
 620  *
 621  * \return the number of filters for the given audio format
 622  *
 623  * \sa struct filter;
 624  */
 625 int num_filters(int audio_format_num)
 626 {
 627         return afi[audio_format_num].num_filters;
 628 }
 629
 630 static void filter_event_handler(struct task *t)
 631 {
 632         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 633         struct filter_chain *fc = t->private_data;
 634         fc->eof = 1;
 635         unregister_task(t);
 636 }
 637
 638 static void open_filters(int slot_num)
 639 {
 640         struct slot_info *s = &slot[slot_num];
 641         struct audio_format_info *a = &afi[s->format];
 642         int nf = a->num_filters;
 643         int i;
 644
 645         s->fc = NULL;
 646         if (!nf)
 647                 return;
 648         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 649         s->fc = para_calloc(sizeof(struct filter_chain));
 650         INIT_LIST_HEAD(&s->fc->filters);
 651         s->fc->inbuf = s->receiver_node->buf;
 652         s->fc->in_loaded = &s->receiver_node->loaded;
 653         s->fc->input_eof = &s->receiver_node->eof;
 654         s->fc->task.pre_select = filter_pre_select;
 655         s->fc->task.event_handler = filter_event_handler;
 656         s->fc->task.private_data = s->fc;
 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         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 792         register_task(&rn->task);
 793 }
 794
 795 static int is_frozen(int format)
 796 {
 797         struct audio_format_info *a = &afi[format];
 798
 799         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 800 }
 801
 802 static void open_current_receiver(struct sched *s)
 803 {
 804         int i;
 805
 806         if (!af_status)
 807                 return;
 808         i = get_audio_format_num(af_status);
 809         if (i < 0)
 810                 return;
 811         if (decoder_running(i) || is_frozen(i))
 812                 return;
 813         open_receiver(i);
 814         /*
 815          * the receiver didn't get a chance to put his fd to the fd set.
 816          * Make the upcoming select() return immediately to avoid a long
 817          * timeout.
 818          */
 819         s->timeout.tv_sec = 0;
 820         s->timeout.tv_usec = 1;
 821 }
 822
 823 static void compute_time_diff(const struct timeval *status_time)
 824 {
 825         struct timeval tmp, diff;
 826         static int count;
 827         int sign;
 828         const struct timeval max_deviation = {0, 500 * 1000};
 829         const int time_smooth = 5;
 830
 831         sign = tv_diff(status_time, now, &diff);
 832 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 833 //                      sign, sa_time_diff_sign);
 834         if (!count) {
 835                 sa_time_diff_sign = sign;
 836                 sa_time_diff = diff;
 837                 count++;
 838                 return;
 839         }
 840         if (count > 5) {
 841                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 842                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 843                         PARA_WARNING_LOG("time diff jump: %lims\n",
 844                                 s * tv2ms(&tmp));
 845         }
 846         count++;
 847         sa_time_diff_sign = tv_convex_combination(
 848                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 849                 count > 10? sign : sign * time_smooth, &diff,
 850                 &tmp);
 851         sa_time_diff = tmp;
 852         PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 853                 sign > 0? "+" : "-",
 854                 tv2ms(&diff),
 855                 sa_time_diff_sign ? "+" : "-",
 856                 tv2ms(&sa_time_diff)
 857         );
 858 }
 859
 860 static void check_stat_line(char *line)
 861 {
 862         int itemnum;
 863         size_t ilen = 0;
 864         long unsigned sec, usec;
 865         char *tmp;
 866
 867 //      PARA_INFO_LOG("line: %s\n", line);
 868         if (!line)
 869                 return;
 870         itemnum = stat_line_valid(line);
 871         if (itemnum < 0) {
 872                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 873                 return;
 874         }
 875         tmp = make_message("%s\n", line);
 876         stat_client_write(tmp, itemnum);
 877         free(tmp);
 878         free(stat_item_values[itemnum]);
 879         stat_item_values[itemnum] = para_strdup(line);
 880         ilen = strlen(status_item_list[itemnum]);
 881         switch (itemnum) {
 882         case SI_STATUS:
 883                 playing = strstr(line, "playing")? 1 : 0;
 884                 break;
 885         case SI_FORMAT:
 886                 free(af_status);
 887                 af_status = para_strdup(line + ilen + 1);
 888                 break;
 889         case SI_OFFSET:
 890                 offset_seconds = atoi(line + ilen + 1);
 891                 break;
 892         case SI_LENGTH:
 893                 length_seconds = atoi(line + ilen + 1);
 894                 break;
 895         case SI_STREAM_START:
 896                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 897                         server_stream_start.tv_sec = sec;
 898                         server_stream_start.tv_usec = usec;
 899                 }
 900                 break;
 901         case SI_CURRENT_TIME:
 902                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 903                         struct timeval tv = {sec, usec};
 904                         compute_time_diff(&tv);
 905                 }
 906                 break;
 907         }
 908 }
 909
 910 static void handle_signal(int sig)
 911 {
 912         switch (sig) {
 913         case SIGCHLD:
 914                 for (;;) {
 915                         pid_t pid = para_reap_child();
 916                         if (pid <= 0)
 917                                 return;
 918                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 919                 }
 920         case SIGINT:
 921         case SIGTERM:
 922         case SIGHUP:
 923                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 924                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 925                 return;
 926         }
 927 }
 928
 929 static void try_to_close_slot(int slot_num)
 930 {
 931         struct slot_info *s = &slot[slot_num];
 932
 933         if (s->format < 0)
 934                 return;
 935         if (s->receiver_node && !s->receiver_node->eof)
 936                 return;
 937         if (s->fc && !s->fc->eof)
 938                 return;
 939         if (s->wng && !s->wng->eof)
 940                 return;
 941         PARA_INFO_LOG("closing slot %d \n", slot_num);
 942         wng_close(s->wng);
 943         close_filters(s->fc);
 944         free(s->fc);
 945         close_receiver(slot_num);
 946         clear_slot(slot_num);
 947 }
 948
 949 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 950 {
 951         int i;
 952
 953         t->ret = 1;
 954         now = &s->now;
 955         if (audiod_status != AUDIOD_ON || !playing)
 956                 kill_all_decoders();
 957         else if (playing)
 958                 open_current_receiver(s);
 959         FOR_EACH_SLOT(i) {
 960                 struct slot_info *s = &slot[i];
 961                 struct audio_format_info *a;
 962
 963                 if (s->format < 0)
 964                         continue;
 965                 a = &afi[s->format];
 966                 if (!s->receiver_node)
 967                         continue;
 968                 if (!a->num_filters) {
 969                         if (s->receiver_node->loaded && !s->wng)
 970                                 open_writers(i);
 971                         continue;
 972                 }
 973                 if (s->receiver_node->loaded && !s->fc) {
 974                         open_filters(i);
 975                         continue;
 976                 }
 977                 if (s->fc && *s->fc->out_loaded && !s->wng)
 978                         open_writers(i);
 979         }
 980 }
 981
 982 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 983 {
 984         int i;
 985
 986         /* save away the current time for other users */
 987         now = &s->now;
 988         t->ret = 1;
 989         FOR_EACH_SLOT(i)
 990                 try_to_close_slot(i);
 991 }
 992
 993 static void init_audiod_task(struct task *t)
 994 {
 995         t->pre_select = audiod_pre_select;
 996         t->post_select = audiod_post_select;
 997         t->event_handler = NULL;
 998         t->private_data = t;
 999         sprintf(t->status, "audiod task");
1000 }
1001
1002 static int parse_stream_command(const char *txt, char **cmd)
1003 {
1004         char *p = strchr(txt, ':');
1005         int i;
1006
1007         if (!p)
1008                 return -E_MISSING_COLON;
1009         p++;
1010         FOR_EACH_AUDIO_FORMAT(i) {
1011                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1012                         continue;
1013                 *cmd = p;
1014                 return i;
1015         }
1016         return -E_UNSUPPORTED_AUDIO_FORMAT;
1017 }
1018
1019 static int add_filter(int format, char *cmdline)
1020 {
1021         struct audio_format_info *a = &afi[format];
1022         int filter_num, nf = a->num_filters;
1023
1024         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1025         if (filter_num < 0)
1026                 return filter_num;
1027         a->filters[nf] = &filters[filter_num];
1028         a->num_filters++;
1029         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1030                 a->filters[nf]->name);
1031         return filter_num;
1032 }
1033
1034 static int init_writers(void)
1035 {
1036         int i, ret, nw;
1037         char *cmd;
1038         struct audio_format_info *a;
1039
1040         init_supported_writers();
1041         nw = PARA_MAX(1, conf.writer_given);
1042         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
1043         FOR_EACH_AUDIO_FORMAT(i) {
1044                 a = &afi[i];
1045                 a->writer_conf = para_malloc(nw * sizeof(void *));
1046                 a->writers = para_malloc(nw * sizeof(struct writer *));
1047                 a->num_writers = 0;
1048         }
1049         for (i = 0; i < conf.writer_given; i++) {
1050                 void *wconf;
1051                 int writer_num;
1052                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1053                 if (ret < 0)
1054                         goto out;
1055                 a = &afi[ret];
1056                 nw = a->num_writers;
1057                 wconf = check_writer_arg(cmd, &writer_num);
1058                 if (!wconf) {
1059                         ret = writer_num;
1060                         goto out;
1061                 }
1062                 a->writers[nw] = &writers[writer_num];
1063                 a->writer_conf[nw] = wconf;
1064                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1065                         nw, writer_names[writer_num]);
1066                 a->num_writers++;
1067         }
1068         ret = 1;
1069 out:
1070         return ret;
1071 }
1072
1073 static int init_receivers(void)
1074 {
1075         int i, ret, receiver_num;
1076         char *cmd = NULL;
1077         struct audio_format_info *a;
1078
1079         for (i = 0; receivers[i].name; i++) {
1080                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1081                 receivers[i].init(&receivers[i]);
1082         }
1083         for (i = 0; i < conf.receiver_given; i++) {
1084                 char *arg = conf.receiver_arg[i];
1085                 char *recv = strchr(arg, ':');
1086                 ret = -E_MISSING_COLON;
1087                 if (!recv)
1088                         goto out;
1089                 *recv = '\0';
1090                 recv++;
1091                 ret = get_audio_format_num(arg);
1092                 if (ret < 0)
1093                         goto out;
1094                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1095                 if (!afi[ret].receiver_conf) {
1096                         ret = -E_RECV_SYNTAX;
1097                         goto out;
1098                 }
1099                 afi[ret].receiver = &receivers[receiver_num];
1100         }
1101         /* use the first available receiver with no arguments
1102          * for those audio formats for which no receiver
1103          * was specified
1104          */
1105         cmd = para_strdup(receivers[0].name);
1106         FOR_EACH_AUDIO_FORMAT(i) {
1107                 a = &afi[i];
1108                 if (a->receiver_conf)
1109                         continue;
1110                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1111                 if (!a->receiver_conf)
1112                         return -E_RECV_SYNTAX;
1113                 a->receiver = &receivers[receiver_num];
1114         }
1115         ret = 1;
1116 out:
1117         free(cmd);
1118         return ret;
1119 }
1120
1121 static int init_default_filters(void)
1122 {
1123         int i, ret = 1;
1124
1125         FOR_EACH_AUDIO_FORMAT(i) {
1126                 struct audio_format_info *a = &afi[i];
1127                 char *tmp;
1128                 int j;
1129
1130                 if (a->num_filters)
1131                         continue; /* no default -- nothing to to */
1132                 /* add "dec" to audio format name */
1133                 tmp = make_message("%sdec", audio_formats[i]);
1134                 for (j = 0; filters[j].name; j++)
1135                         if (!strcmp(tmp, filters[j].name))
1136                                 break;
1137                 free(tmp);
1138                 ret = -E_UNSUPPORTED_FILTER;
1139                 if (!filters[j].name)
1140                         goto out;
1141                 tmp = para_strdup(filters[j].name);
1142                 ret = add_filter(i, tmp);
1143                 free(tmp);
1144                 if (ret < 0)
1145                         goto out;
1146                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1147                         filters[j].name);
1148         }
1149 out:
1150         return ret;
1151 }
1152
1153 static int init_filters(void)
1154 {
1155         int i, ret, nf;
1156
1157         filter_init(filters);
1158         nf = PARA_MAX(1,  conf.filter_given);
1159         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1160         FOR_EACH_AUDIO_FORMAT(i) {
1161                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1162                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1163         }
1164         if (!conf.no_default_filters_given)
1165                 return init_default_filters();
1166         for (i = 0; i < conf.filter_given; i++) {
1167                 char *arg = conf.filter_arg[i];
1168                 char *filter_name = strchr(arg, ':');
1169                 ret = -E_MISSING_COLON;
1170                 if (!filter_name)
1171                         goto out;
1172                 *filter_name = '\0';
1173                 filter_name++;
1174                 ret = get_audio_format_num(arg);
1175                 if (ret < 0)
1176                         goto out;
1177                 ret = add_filter(ret, filter_name);
1178                 if (ret < 0)
1179                         goto out;
1180         }
1181         ret = init_default_filters(); /* use default values for the rest */
1182 out:
1183         return ret;
1184 }
1185
1186 static int init_stream_io(void)
1187 {
1188         int ret;
1189
1190         ret = init_writers();
1191         if (ret < 0)
1192                 return ret;
1193         ret = init_receivers();
1194         if (ret < 0)
1195                 return ret;
1196         ret = init_filters();
1197         if (ret < 0)
1198                 return ret;
1199         return 1;
1200 }
1201
1202 static int dump_commands(int fd)
1203 {
1204         char *buf = para_strdup(""), *tmp = NULL;
1205         int i;
1206         ssize_t ret;
1207
1208         FOR_EACH_COMMAND(i) {
1209                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1210                         cmds[i].description);
1211                 free(buf);
1212                 buf = tmp;
1213         }
1214         ret = client_write(fd, buf);
1215         free(buf);
1216         return ret;
1217 }
1218
1219 /*
1220  * command handlers don't close their fd on errors (ret < 0) so that
1221  * its caller can send an error message. Otherwise (ret >= 0) it's up
1222  * to each individual command to close the fd if necessary.
1223  */
1224
1225 static int com_help(int fd, int argc, char **argv)
1226 {
1227         int i, ret;
1228         char *buf;
1229         const char *dflt = "No such command. Available commands:\n";
1230
1231         if (argc < 2) {
1232                 ret = dump_commands(fd);
1233                 goto out;
1234         }
1235         FOR_EACH_COMMAND(i) {
1236                 if (strcmp(cmds[i].name, argv[1]))
1237                         continue;
1238                 buf = make_message(
1239                         "NAME\n\t%s -- %s\n"
1240                         "SYNOPSIS\n\tpara_audioc %s\n"
1241                         "DESCRIPTION\n%s\n",
1242                         argv[1],
1243                         cmds[i].description,
1244                         cmds[i].synopsis,
1245                         cmds[i].help
1246                 );
1247                 ret = client_write(fd, buf);
1248                 free(buf);
1249                 goto out;
1250         }
1251         ret = client_write(fd, dflt);
1252         if (ret > 0)
1253                 ret = dump_commands(fd);
1254 out:
1255         if (ret >= 0)
1256                 close(fd);
1257         return ret;
1258 }
1259
1260 static int com_tasks(int fd, __a_unused int argc, __a_unused char **argv)
1261 {
1262         char *tl = get_task_list();
1263         int ret = 1;
1264         if (tl)
1265                 ret = client_write(fd, tl);
1266         free(tl);
1267         if (ret > 0)
1268                 close(fd);
1269         return ret;
1270 }
1271
1272 static int com_kill(int fd, int argc, char **argv)
1273 {
1274         int i, ret = 1;
1275         if (argc < 2)
1276                 return -E_AUDIOD_SYNTAX;
1277         for (i = 1; i < argc; i++) {
1278                 ret = kill_task(argv[i]);
1279                 if (ret < 0)
1280                         break;
1281         }
1282         if (ret > 0)
1283                 close(fd);
1284         return ret;
1285 }
1286
1287 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1288 {
1289         int i, ret;
1290         char *buf = NULL;
1291         long unsigned mask = ~0LU;
1292
1293         if (argc > 1) {
1294                 mask = 0;
1295                 for (i = 1; i < argc; i++) {
1296                         ret = stat_item_valid(argv[i]);
1297                         if (ret < 0)
1298                                 return ret;
1299                         mask |= (1 << ret);
1300                 }
1301         }
1302         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1303         if (mask & (1 << SI_PLAY_TIME)) {
1304                 struct timeval *t = wstime();
1305                 char *ts = get_time_string(t);
1306                 if (ts) {
1307                         ret = client_write(fd, ts);
1308                         if (ret < 0)
1309                                 goto out;
1310                         free(ts);
1311                 }
1312         }
1313         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1314                 char *tmp, *us = uptime_str();
1315                 tmp = make_message("%s:%s\n",
1316                         status_item_list[SI_AUDIOD_UPTIME], us);
1317                 free(us);
1318                 ret = client_write(fd, tmp);
1319                 if (ret < 0)
1320                         goto out;
1321                 free(tmp);
1322         }
1323         if (mask & (1 << SI_AUDIOD_STATUS)) {
1324                 char *s = audiod_status_string();
1325                 ret = client_write(fd, s);
1326                 if (ret < 0)
1327                         goto out;
1328                 free(s);
1329         }
1330         if (mask & (1 << SI_DECODER_FLAGS)) {
1331                 char *df =decoder_flags();
1332                 ret = client_write(fd, df);
1333                 if (ret < 0)
1334                         goto out;
1335                 free(df);
1336         }
1337
1338         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1339                 char *tmp, *v;
1340                 if (!((1 << i) & mask))
1341                         continue;
1342                 v = stat_item_values[i];
1343                 tmp = make_message("%s%s%s", buf? buf: "",
1344                         v? v : "", v? "\n" : "");
1345                 free(buf);
1346                 buf = tmp;
1347         }
1348         ret = client_write(fd, buf);
1349 out:
1350         if (ret > 0)
1351                 ret = stat_client_add(fd, mask);
1352         free(buf);
1353         return ret;
1354 }
1355
1356 static int com_grab(int fd, char *cmdline)
1357 {
1358         struct grab_client *gc;
1359         struct filter_node *fn;
1360         int i, err;
1361         char *msg;
1362
1363         gc = grab_client_new(fd, cmdline, &err);
1364         if (!gc)
1365                 goto err_out;
1366         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1367         if (fn)
1368                 activate_grab_client(gc, fn);
1369         return 1;
1370 err_out:
1371         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1372                 return err;
1373         if (err == -E_GC_HELP_GIVEN) {
1374                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1375                 for (i = 0; grab_client_args_info_help[i]; i++) {
1376                         char *tmp = make_message("%s%s\n", msg,
1377                                 grab_client_args_info_help[i]);
1378                         free(msg);
1379                         msg = tmp;
1380                 }
1381         } else
1382                 msg = make_message("%s %s\n",
1383                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1384                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1385         err = client_write(fd, msg);
1386         free(msg);
1387         if (err < 0)
1388                 return err;
1389         close(fd);
1390         return 1;
1391 }
1392
1393 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1394 {
1395         close(fd);
1396         clean_exit(EXIT_SUCCESS, "terminating on user request");
1397 }
1398
1399 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1400 {
1401         audiod_status = AUDIOD_ON;
1402         close(fd);
1403         return 1;
1404 }
1405
1406 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1407 {
1408         audiod_status = AUDIOD_OFF;
1409         close(fd);
1410         return 1;
1411 }
1412
1413 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1414 {
1415         audiod_status = AUDIOD_STANDBY;
1416         close(fd);
1417         return 1;
1418 }
1419
1420 static int com_cycle(int fd, int argc, char **argv)
1421 {
1422         switch (audiod_status) {
1423                 case  AUDIOD_ON:
1424                         return com_sb(fd, argc, argv);
1425                         break;
1426                 case  AUDIOD_OFF:
1427                         return com_on(fd, argc, argv);
1428                         break;
1429                 case  AUDIOD_STANDBY:
1430                         return com_off(fd, argc, argv);
1431                         break;
1432         }
1433         close(fd);
1434         return 1;
1435 }
1436
1437 static int check_perms(uid_t uid)
1438 {
1439         int i;
1440
1441         if (!conf.user_allow_given)
1442                 return 1;
1443         for (i = 0; i < conf.user_allow_given; i++)
1444                 if (uid == conf.user_allow_arg[i])
1445                         return 1;
1446         return -E_UCRED_PERM;
1447 }
1448
1449 static int handle_connect(int accept_fd)
1450 {
1451         int i, argc, ret, clifd = -1;
1452         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1453         struct sockaddr_un unix_addr;
1454
1455         ret = para_accept(accept_fd, &unix_addr, sizeof(struct sockaddr_un));
1456         if (ret < 0)
1457                 goto out;
1458         clifd = ret;
1459         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1460         if (ret < 0)
1461                 goto out;
1462         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1463         ret = check_perms(ret);
1464         if (ret < 0)
1465                 goto out;
1466         ret = -E_INVALID_AUDIOD_CMD;
1467         cmd = para_strdup(buf);
1468         p = strchr(cmd, '\n');
1469         if (!p)
1470                 p = "";
1471         else {
1472                 *p = '\0';
1473                 p++;
1474         }
1475         for (i = 0; cmds[i].name; i++) {
1476                 int j;
1477                 if (strcmp(cmds[i].name, cmd))
1478                         continue;
1479                 if (cmds[i].handler) {
1480                         argc = split_args(buf, &argv, "\n");
1481                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1482                         ret = cmds[i].handler(clifd, argc, argv);
1483                         goto out;
1484                 }
1485                 for (j = 0; p[j]; j++)
1486                         if (p[j] == '\n')
1487                                 p[j] = ' ';
1488                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1489                 ret = cmds[i].line_handler(clifd, p);
1490                 goto out;
1491         }
1492         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1493 out:
1494         free(cmd);
1495         free(buf);
1496         free(argv);
1497         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1498                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1499                 client_write(clifd, tmp);
1500                 free(tmp);
1501                 close(clifd);
1502         }
1503         return ret;
1504 }
1505
1506 static int audiod_get_socket(void)
1507 {
1508         struct sockaddr_un unix_addr;
1509         int fd;
1510
1511         if (conf.socket_given)
1512                 socket_name = para_strdup(conf.socket_arg);
1513         else {
1514                 char *hn = para_hostname();
1515                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1516                         hn);
1517                 free(hn);
1518         }
1519         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1520         if (conf.force_given)
1521                 unlink(socket_name);
1522         fd = create_pf_socket(socket_name, &unix_addr,
1523                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1524         if (fd < 0) {
1525                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1526                 exit(EXIT_FAILURE); /* do not unlink socket */
1527         }
1528         if (listen(fd , 5) < 0) {
1529                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1530                 exit(EXIT_FAILURE); /* do not unlink socket */
1531         }
1532         add_close_on_fork_list(fd);
1533         return fd;
1534 }
1535
1536 static int open_stat_pipe(void)
1537 {
1538         int ret, fd[3] = {-1, 1, 0};
1539         pid_t pid;
1540         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1541         if (ret >= 0) {
1542                 ret = fd[1];
1543                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1544                 add_close_on_fork_list(ret);
1545         } else
1546                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1547         return ret;
1548 }
1549
1550 void signal_event_handler(struct task *t)
1551 {
1552         struct signal_task *st = t->private_data;
1553
1554         if (t->ret != -E_SIGNAL_CAUGHT)
1555                 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
1556         else
1557                 handle_signal(st->signum);
1558 }
1559
1560 void signal_pre_select(struct sched *s, struct task *t)
1561 {
1562         struct signal_task *st = t->private_data;
1563         t->ret = 1;
1564         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1565 }
1566
1567 void signal_post_select(struct sched *s, struct task *t)
1568 {
1569         struct signal_task *st = t->private_data;
1570         t->ret = 1;
1571         if (!FD_ISSET(st->fd, &s->rfds))
1572                 return;
1573         t->ret = -E_SIGNAL_CAUGHT;
1574         st->signum = para_next_signal();
1575 }
1576
1577 void signal_setup_default(struct signal_task *st)
1578 {
1579         st->task.pre_select = signal_pre_select;
1580         st->task.post_select = signal_post_select;
1581         st->task.private_data = st;
1582         sprintf(st->task.status, "signal task");
1583 }
1584
1585 static void command_pre_select(struct sched *s, struct task *t)
1586 {
1587         struct command_task *ct = t->private_data;
1588         t->ret = 1;
1589         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1590
1591 }
1592
1593 static void command_post_select(struct sched *s, struct task *t)
1594 {
1595         int ret;
1596         struct command_task *ct = t->private_data;
1597
1598         t->ret = 1; /* always successful */
1599         if (audiod_status != AUDIOD_OFF)
1600                 audiod_status_dump();
1601         if (!FD_ISSET(ct->fd, &s->rfds))
1602                 return;
1603         ret = handle_connect(ct->fd);
1604         if (ret < 0)
1605                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1606 }
1607
1608 static void init_command_task(struct command_task *ct)
1609 {
1610         ct->task.pre_select = command_pre_select;
1611         ct->task.post_select = command_post_select;
1612         ct->task.event_handler = NULL;
1613         ct->task.private_data = ct;
1614         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1615         sprintf(ct->task.status, "command task");
1616 }
1617
1618 static void status_event_handler(__a_unused struct task *t)
1619 {
1620         struct timeval delay = {1, 0};
1621         int i;
1622         struct status_task *st = t->private_data;
1623
1624         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
1625         close_stat_pipe();
1626         /* avoid busy loop if server is down */
1627         tv_add(now, &delay, &st->restart_barrier);
1628         FOR_EACH_AUDIO_FORMAT(i)
1629                 afi[i].restart_barrier = st->restart_barrier;
1630 }
1631
1632 static void status_pre_select(struct sched *s, struct task *t)
1633 {
1634         struct status_task *st = t->private_data;
1635         t->ret = 1;
1636         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1637                 close_stat_pipe();
1638         if (st->fd < 0 && audiod_status != AUDIOD_OFF
1639                 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
1640                 st->fd = open_stat_pipe();
1641                 st->loaded = 0;
1642                 st->buf[0] = '\0';
1643         }
1644         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1645                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1646 }
1647
1648 static void status_post_select(struct sched *s, struct task *t)
1649 {
1650         struct status_task *st = t->private_data;
1651
1652         t->ret = 1;
1653         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1654                 return;
1655         t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1656         if (t->ret <= 0) {
1657                 if (!t->ret)
1658                         t->ret = -E_STATUS_EOF;
1659                 return;
1660         }
1661         st->buf[t->ret + st->loaded] = '\0';
1662         st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1663                 &check_stat_line);
1664 }
1665
1666 static void init_status_task(struct status_task *st)
1667 {
1668         memset(st, 0, sizeof(struct status_task));
1669         st->task.pre_select = status_pre_select;
1670         st->task.post_select = status_post_select;
1671         st->task.event_handler = status_event_handler;
1672         st->task.private_data = st;
1673         st->fd = -1;
1674         sprintf(st->task.status, "status task");
1675 }
1676
1677 static void set_initial_status(void)
1678 {
1679         audiod_status = AUDIOD_ON;
1680         if (!conf.mode_given)
1681                 return;
1682         if (!strcmp(conf.mode_arg, "sb")) {
1683                 audiod_status = AUDIOD_STANDBY;
1684                 return;
1685         }
1686         if (!strcmp(conf.mode_arg, "off")) {
1687                 audiod_status = AUDIOD_OFF;
1688                 return;
1689         }
1690         if (strcmp(conf.mode_arg, "on"))
1691                 PARA_WARNING_LOG("%s", "invalid mode\n");
1692 }
1693
1694 int main(int argc, char *argv[])
1695 {
1696         char *cf;
1697         int ret, i;
1698         struct sched s;
1699         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1700         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1701
1702         init_sched();
1703
1704         valid_fd_012();
1705         hostname = para_hostname();
1706         cmdline_parser(argc, argv, &conf);
1707         para_drop_privileges(conf.user_arg, conf.group_arg);
1708         cf = configfile_exists();
1709         if (cf) {
1710                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1711                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1712                         exit(EXIT_FAILURE);
1713                 }
1714         }
1715         if (conf.logfile_given)
1716                 logfile = open_log(conf.logfile_arg);
1717         log_welcome("para_audiod", conf.loglevel_arg);
1718         i = init_stream_io();
1719         if (i < 0) {
1720                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1721                 exit(EXIT_FAILURE);
1722         }
1723         server_uptime(UPTIME_SET);
1724         set_initial_status();
1725         FOR_EACH_SLOT(i)
1726                 clear_slot(i);
1727         init_grabbing();
1728         setup_signal_handling();
1729         signal_setup_default(sig_task);
1730         sig_task->task.event_handler = signal_event_handler;
1731
1732         init_status_task(stat_task);
1733         init_command_task(cmd_task);
1734         init_audiod_task(audiod_task);
1735
1736         if (conf.daemon_given)
1737                 daemon_init();
1738
1739         register_task(&sig_task->task);
1740         register_task(&cmd_task->task);
1741         register_task(&stat_task->task);
1742         register_task(audiod_task);
1743         s.default_timeout.tv_sec = 3;
1744         s.default_timeout.tv_usec = 99 * 1000;
1745         ret = sched(&s);
1746
1747         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1748         return EXIT_FAILURE;
1749 }