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