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 <sys/time.h> /* gettimeofday */
  22 #include "para.h"
  23
  24 #include "audiod.cmdline.h"
  25 #include "list.h"
  26 #include "close_on_fork.h"
  27 #include "sched.h"
  28 #include "recv.h"
  29 #include "filter.h"
  30 #include "grab_client.cmdline.h"
  31 #include "grab_client.h"
  32
  33 #include "error.h"
  34 #include "audiod.h"
  35 #include "net.h"
  36 #include "daemon.h"
  37 #include "string.h"
  38 #include "fd.h"
  39 #include "write.h"
  40 #include "write_common.h"
  41
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 DEFINE_AUDIO_FORMAT_ARRAY;
  46
  47 /**
  48  * the possible modes of operation
  49  *
  50  * - off: disconnect from para_server
  51  * - on: receive status information from para_server and play the audio stream
  52  * - sb: only receive status information but not the audio stream
  53 */
  54 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  55
  56 /** defines how to handle one supported audio format */
  57 struct audio_format_info {
  58         /** pointer to the receiver for this audio format */
  59         struct receiver *receiver;
  60         /** the receiver configuration */
  61         void *receiver_conf;
  62         /** the number of filters that should be activated for this audio format */
  63         unsigned int num_filters;
  64         /** pointer to the array of filters to be activated */
  65         struct filter **filters;
  66         /** pointer to the array of filter configurations */
  67         void **filter_conf;
  68         /** the number of filters that should be activated for this audio format */
  69         unsigned int num_writers;
  70         /** pointer to the array of writers to be activated */
  71         struct writer **writers;
  72         /** pointer to the array of writer configurations */
  73         void **writer_conf;
  74         /** do not start receiver/filters/writer before this time */
  75         struct timeval restart_barrier;
  76 };
  77
  78 /**
  79  * describes one instance of a receiver-filter-writer chain
  80  *
  81  * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
  82  * writer_node, writer_node_group.
  83   */
  84 struct slot_info {
  85         /** number of the audio format in this slot */
  86         int format;
  87         /** time of the last successful read from the receiver */
  88         struct timeval rtime;
  89         /** time the last write to the write fd happend */
  90         struct timeval wtime;
  91         /** writer start time */
  92         struct timeval wstime;
  93         /** the receiver info associated with this slot */
  94         struct receiver_node *receiver_node;
  95         /** the active filter chain */
  96         struct filter_chain *fc;
  97         /** the active writer node group */
  98         struct writer_node_group *wng;
  99 };
 100 static struct slot_info slot[MAX_STREAM_SLOTS];
 101
 102 extern const char *status_item_list[NUM_STAT_ITEMS];
 103
 104 static struct gengetopt_args_info conf;
 105 static struct timeval server_stream_start, sa_time_diff;
 106 static int playing, current_decoder = -1,
 107         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 108         sa_time_diff_sign = 1;
 109 static char *af_status, /* the audio format announced in server status */
 110         *socket_name, *hostname;
 111 static char *stat_item_values[NUM_STAT_ITEMS];
 112 static FILE *logfile;
 113 static const struct timeval restart_delay = {0, 300 * 1000};
 114
 115 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 116
 117 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 118
 119 struct command_task {
 120         int fd;
 121         struct task task;
 122 };
 123 static struct command_task command_task_struct, *cmd_task = &command_task_struct;
 124
 125 struct status_task {
 126         int fd;
 127         struct task task;
 128         char buf[STRINGSIZE];
 129         unsigned loaded;
 130 };
 131 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 132
 133 struct audiod_task {
 134         struct task task;
 135 };
 136 static struct audiod_task audiod_task_struct, *at = &audiod_task_struct;
 137
 138 struct signal_task {
 139         int fd;
 140         int signum;
 141         struct task task;
 142 };
 143
 144
 145 /** defines one command of para_audiod */
 146 struct audiod_command {
 147         /** the name of the command */
 148         const char *name;
 149         /** pointer to the function that handles the command */
 150         int (*handler)(int, int, char**);
 151         int (*line_handler)(int, char*);
 152         /** one-line description of the command */
 153         const char *description;
 154         /** summary of the command line options */
 155         const char *synopsis;
 156         /** the long help text */
 157         const char *help;
 158 };
 159 static int com_grab(int, char *);
 160 static int com_cycle(int, int, char **);
 161 static int com_help(int, int, char **);
 162 static int com_off(int, int, char **);
 163 static int com_on(int, int, char **);
 164 static int com_sb(int, int, char **);
 165 static int com_stat(int, int, char **);
 166 static int com_term(int, int, char **);
 167 static struct audiod_command cmds[] = {
 168 {
 169 .name = "cycle",
 170 .handler = com_cycle,
 171 .description = "switch to next mode",
 172 .synopsis = "cycle",
 173 .help =
 174
 175 "on -> standby -> off -> on\n"
 176
 177 },
 178 {
 179 .name = "grab",
 180 .line_handler = com_grab,
 181 .description = "grab the audio stream",
 182 .synopsis = "-- grab [grab_options]",
 183 .help =
 184
 185 "grab ('splice') the audio stream at any position in the filter      \n"
 186 "chain and send that data back to the client. Try\n"
 187 "\t para_audioc -- grab -h\n"
 188 "for the list of available options.\n"
 189 },
 190
 191 {
 192 .name = "help",
 193 .handler = com_help,
 194 .description = "display command list or help for given command",
 195 .synopsis = "help [command]",
 196 .help =
 197
 198 "When I was younger, so much younger than today, I never needed\n"
 199 "anybody's help in any way. But now these days are gone, I'm not so\n"
 200 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 201 "\n"
 202 "                               -- Beatles: Help\n"
 203
 204 },
 205 {
 206 .name = "off",
 207 .handler = com_off,
 208 .description = "deactivate para_audiod",
 209 .synopsis = "off",
 210 .help =
 211
 212 "Close connection to para_server and stop all decoders.\n"
 213
 214 },
 215 {
 216 .name = "on",
 217 .handler = com_on,
 218 .description = "activate para_audiod",
 219 .synopsis = "on",
 220 .help =
 221
 222 "Establish connection to para_server, retrieve para_server's current\n"
 223 "status. If playing, start corresponding decoder. Otherwise stop\n"
 224 "all decoders.\n"
 225
 226 },
 227 {
 228 .name = "sb",
 229 .handler = com_sb,
 230 .description = "enter standby mode",
 231 .synopsis = "sb",
 232 .help =
 233
 234 "Stop all decoders but leave connection to para_server open.\n"
 235
 236 },
 237 {
 238 .name = "stat",
 239 .handler = com_stat,
 240 .description = "print status information",
 241 .synopsis = "stat [item1 ...]",
 242 .help =
 243
 244 "Dump given status items (all if none given) to stdout.\n"
 245
 246 },
 247 {
 248 .name = "term",
 249 .handler = com_term,
 250 .description = "terminate audiod",
 251 .synopsis = "term",
 252 .help =
 253
 254 "Stop all decoders, shut down connection to para_server and exit.\n"
 255
 256 },
 257 {
 258 .name = NULL,
 259 }
 260 };
 261
 262 /** iterate over all slots */
 263 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 264 /** iterate over all supported audio formats */
 265 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 266 /** iterate over the array of all audiod commands */
 267 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 268
 269 /**
 270  * get the audio format number
 271  * \param name the name of the audio format
 272  *
 273  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 274  * \a name is not a supported audio format.
 275  */
 276 int get_audio_format_num(char *name)
 277 {
 278         int i;
 279         FOR_EACH_AUDIO_FORMAT(i)
 280                 if (!strcmp(name, audio_formats[i]))
 281                         return i;
 282         return -E_UNSUPPORTED_AUDIO_FORMAT;
 283 }
 284
 285 /*
 286  * log function. first argument is loglevel.
 287  */
 288 void para_log(int ll, const char* fmt,...)
 289 {
 290         va_list argp;
 291         FILE *outfd;
 292         struct tm *tm;
 293         time_t t1;
 294         char str[MAXLINE] = "";
 295
 296         if (ll < conf.loglevel_arg)
 297                 return;
 298         outfd = logfile? logfile : stderr;
 299         time(&t1);
 300         tm = localtime(&t1);
 301         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 302         fprintf(outfd, "%s %s ", str, hostname);
 303         if (conf.loglevel_arg <= INFO)
 304                 fprintf(outfd, "%i ", ll);
 305         va_start(argp, fmt);
 306         vfprintf(outfd, fmt, argp);
 307         va_end(argp);
 308 }
 309
 310 static int client_write(int fd, const char *buf)
 311 {
 312         size_t len = strlen(buf);
 313         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 314 }
 315
 316 static char *get_time_string(struct timeval *newest_stime)
 317 {
 318         struct timeval now, diff, adj_stream_start, tmp;
 319         int total = 0, use_server_time = 1;
 320
 321         if (!playing) {
 322                 if (length_seconds)
 323                         return NULL;
 324                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 325         }
 326         if (audiod_status == AUDIOD_OFF)
 327                 goto out;
 328         if (sa_time_diff_sign > 0)
 329                 tv_diff(&server_stream_start, &sa_time_diff,
 330                         &adj_stream_start);
 331         else
 332                 tv_add(&server_stream_start, &sa_time_diff,
 333                         &adj_stream_start);
 334         tmp = adj_stream_start;
 335         if (newest_stime && audiod_status == AUDIOD_ON) {
 336                 tv_diff(newest_stime, &adj_stream_start, &diff);
 337                 if (tv2ms(&diff) < 5000) {
 338                         tmp = *newest_stime;
 339                         use_server_time = 0;
 340                 }
 341         }
 342         gettimeofday(&now, NULL);
 343         tv_diff(&now, &tmp, &diff);
 344         total = diff.tv_sec + offset_seconds;
 345         if (total > length_seconds)
 346                 total = length_seconds;
 347         if (total < 0)
 348                 total = 0;
 349 out:
 350         return make_message(
 351                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 352                 status_item_list[SI_PLAY_TIME],
 353                 use_server_time? "~" : "",
 354                 total / 60,
 355                 total % 60,
 356                 (length_seconds - total) / 60,
 357                 (length_seconds - total) % 60,
 358                 length_seconds? (total * 100 + length_seconds / 2) /
 359                         length_seconds : 0,
 360                 length_seconds / 60,
 361                 length_seconds % 60
 362         );
 363 }
 364
 365 __malloc static char *audiod_status_string(void)
 366 {
 367         const char *status = (audiod_status == AUDIOD_ON)?
 368                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 369         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 370 }
 371
 372 static struct timeval *wstime(void)
 373 {
 374         int i;
 375         struct timeval *max = NULL;
 376         FOR_EACH_SLOT(i) {
 377                 struct slot_info *s = &slot[i];
 378                 if (!s->wng)
 379                         continue;
 380                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 381                         continue;
 382                 max = &s->wstime;
 383         }
 384         return max;
 385 }
 386 __malloc static char *decoder_flags(void)
 387 {
 388         int i;
 389         char decoder_flags[MAX_STREAM_SLOTS + 1];
 390
 391         FOR_EACH_SLOT(i) {
 392                 struct slot_info *s = &slot[i];
 393                 char flag = '0';
 394                 if (s->receiver_node)
 395                         flag += 1;
 396                 if (s->wng)
 397                         flag += 2;
 398                 decoder_flags[i] = flag;
 399         }
 400         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 401         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 402                 decoder_flags);
 403 }
 404
 405 static char *configfile_exists(void)
 406 {
 407         static char *config_file;
 408
 409         if (!config_file) {
 410                 char *home = para_homedir();
 411                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 412                 free(home);
 413         }
 414         return file_exists(config_file)? config_file : NULL;
 415 }
 416
 417 static void setup_signal_handling(void)
 418 {
 419         sig_task->fd = para_signal_init();
 420         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 421         para_install_sighandler(SIGINT);
 422         para_install_sighandler(SIGTERM);
 423         para_install_sighandler(SIGCHLD);
 424         para_install_sighandler(SIGHUP);
 425         signal(SIGPIPE, SIG_IGN);
 426 }
 427
 428 static void audiod_status_dump(void)
 429 {
 430         static char *p_ts, *p_us, *p_as, *p_df;
 431         struct timeval *t = wstime();
 432         char *us, *tmp = get_time_string(t);
 433
 434         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 435                 stat_client_write(tmp, SI_PLAY_TIME);
 436         free(p_ts);
 437         p_ts = tmp;
 438
 439         us = uptime_str();
 440         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 441         free(us);
 442         if (!p_us || strcmp(p_us, tmp))
 443                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 444         free(p_us);
 445         p_us = tmp;
 446
 447         tmp = audiod_status_string();
 448         if (!p_as || strcmp(p_as, tmp))
 449                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 450         free(p_as);
 451         p_as = tmp;
 452
 453         tmp = decoder_flags();
 454         if (!p_df || strcmp(p_df, tmp))
 455                 stat_client_write(tmp, SI_DECODER_FLAGS);
 456         free(p_df);
 457         p_df = tmp;
 458 }
 459
 460 static void clear_slot(int slot_num)
 461 {
 462         struct slot_info *s = &slot[slot_num];
 463
 464         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 465         memset(s, 0, sizeof(struct slot_info));
 466         s->format = -1;
 467 }
 468
 469 static void set_restart_barrier(int format, struct timeval *now)
 470 {
 471         struct timeval tmp;
 472
 473         if (now)
 474                 tmp = *now;
 475         else
 476                 gettimeofday(&tmp, NULL);
 477         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 478 }
 479
 480 static void close_receiver(int slot_num)
 481 {
 482         struct slot_info *s = &slot[slot_num];
 483         struct audio_format_info *a;
 484
 485         if (s->format < 0 || !s->receiver_node)
 486                 return;
 487         a = &afi[s->format];
 488         PARA_NOTICE_LOG("closing %s recevier in slot %d (eof = %d)\n",
 489                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 490         if (!s->receiver_node->eof)
 491                 unregister_task(&s->receiver_node->task);
 492         a->receiver->close(s->receiver_node);
 493         free(s->receiver_node);
 494         s->receiver_node = NULL;
 495         set_restart_barrier(s->format, NULL);
 496 }
 497
 498 static void kill_all_decoders(void)
 499 {
 500         int i;
 501
 502         FOR_EACH_SLOT(i) {
 503                 struct slot_info *s = &slot[i];
 504                 if (s->receiver_node)
 505                         s->receiver_node->eof = 1;
 506         }
 507 }
 508
 509 static void check_sigchld(void)
 510 {
 511         pid_t pid;
 512         struct timeval now;
 513         gettimeofday(&now, NULL);
 514
 515 reap_next_child:
 516         pid = para_reap_child();
 517         if (pid <= 0)
 518                 return;
 519         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 520         goto reap_next_child;
 521 }
 522
 523 static int get_empty_slot(void)
 524 {
 525         int i;
 526         struct slot_info *s;
 527
 528         FOR_EACH_SLOT(i) {
 529                 s = &slot[i];
 530                 if (s->format < 0) {
 531                         clear_slot(i);
 532                         return i;
 533                 }
 534                 if (s->wng)
 535                         continue;
 536                 if (s->receiver_node)
 537                         continue;
 538                 if (s->fc)
 539                         continue;
 540                 clear_slot(i);
 541                 return i;
 542         }
 543         return -E_NO_MORE_SLOTS;
 544 }
 545
 546 static int decoder_running(int format)
 547 {
 548         int i, ret = 0;
 549         struct slot_info *s;
 550
 551         FOR_EACH_SLOT(i) {
 552                 s = &slot[i];
 553                 if (s->format == format && s->receiver_node)
 554                         ret |= 1;
 555                 if (s->format == format && s->wng)
 556                         ret |= 2;
 557         }
 558         return ret;
 559 }
 560
 561 static void close_stat_pipe(void)
 562 {
 563         int i;
 564
 565         if (stat_task->fd < 0)
 566                 return;
 567         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 568         close(stat_task->fd);
 569         del_close_on_fork_list(stat_task->fd);
 570         stat_task->fd = -1;
 571         kill_all_decoders();
 572         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 573                 free(stat_item_values[i]);
 574                 stat_item_values[i] = NULL;
 575         }
 576         dump_empty_status();
 577         length_seconds = 0;
 578         offset_seconds = 0;
 579         audiod_status_dump();
 580         playing = 0;
 581         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 582                 status_item_list[SI_STATUS_BAR]);
 583         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 584 }
 585
 586 static void __noreturn clean_exit(int status, const char *msg)
 587 {
 588         PARA_EMERG_LOG("%s\n", msg);
 589         kill_all_decoders();
 590         if (socket_name)
 591                 unlink(socket_name);
 592         if (stat_task->fd >= 0)
 593                 close_stat_pipe();
 594         exit(status);
 595 }
 596
 597 /** get the number of filters for the given audio format */
 598 int num_filters(int audio_format_num)
 599 {
 600         return afi[audio_format_num].num_filters;
 601 }
 602
 603 void filter_event_handler(struct task *t)
 604 {
 605         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 606         unregister_task(t);
 607 }
 608
 609 static void open_filters(int slot_num)
 610 {
 611         struct slot_info *s = &slot[slot_num];
 612         struct audio_format_info *a = &afi[s->format];
 613         int nf = a->num_filters;
 614         int i;
 615
 616         s->fc = NULL;
 617         if (!nf)
 618                 return;
 619         s->fc = para_calloc(sizeof(struct filter_chain));
 620         INIT_LIST_HEAD(&s->fc->filters);
 621         s->fc->inbuf = s->receiver_node->buf;
 622         s->fc->in_loaded = &s->receiver_node->loaded;
 623         s->fc->input_eof = &s->receiver_node->eof;
 624
 625         s->fc->task.pre_select = filter_pre_select;
 626         s->fc->task.event_handler = filter_event_handler;
 627         s->fc->task.private_data = s->fc;
 628         s->fc->task.flags = 0;
 629         s->fc->eof = 0;
 630         sprintf(s->fc->task.status, "filter chain");
 631         for (i = 0; i < nf; i++) {
 632                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 633                 fn->conf = a->filter_conf[i];
 634                 fn->fc = s->fc;
 635                 fn->filter = a->filters[i];
 636                 INIT_LIST_HEAD(&fn->callbacks);
 637                 list_add_tail(&fn->node, &s->fc->filters);
 638                 fn->filter->open(fn);
 639                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 640                         audio_formats[s->format], i + 1,  nf,
 641                         fn->filter->name, slot_num);
 642                 s->fc->outbuf = fn->buf;
 643                 s->fc->out_loaded = &fn->loaded;
 644         }
 645         register_task(&s->fc->task);
 646 //      PARA_DEBUG_LOG("output loaded for filter chain %p: %p\n", s->fc,
 647 //              s->fc->out_loaded);
 648 }
 649
 650 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 651 {
 652         struct filter_node *fn;
 653         int i, j;
 654
 655         FOR_EACH_SLOT(i) {
 656                 struct slot_info *s = &slot[i];
 657                 if (s->format < 0 || !s->fc)
 658                         continue;
 659                 if (slot_num >= 0 && slot_num != i)
 660                         continue;
 661                 if (format >= 0 && s->format != format)
 662                         continue;
 663                 if (num_filters(i) < filternum)
 664                         continue;
 665                 /* success */
 666                 j = 1;
 667                 list_for_each_entry(fn, &s->fc->filters, node)
 668                         if (filternum <= 0 || j++ == filternum)
 669                                 break;
 670                 return fn;
 671         }
 672         return NULL;
 673 }
 674
 675 static void wng_event_handler(struct task *t)
 676 {
 677         struct writer_node_group *g = t->private_data;
 678         int i;
 679
 680         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 681         unregister_task(t);
 682         FOR_EACH_SLOT(i) {
 683                 if (slot[i].wng != g)
 684                         continue;
 685                 wng_close(g);
 686                 wng_destroy(g);
 687                 slot[i].wng = NULL;
 688         }
 689 }
 690
 691 static void start_stream_writer(int slot_num, struct timeval *now)
 692 {
 693         int ret, i;
 694         struct slot_info *s = &slot[slot_num];
 695         struct audio_format_info *a = &afi[s->format];
 696
 697         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 698         open_filters(slot_num);
 699         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 700         if (!a->num_writers)
 701                 s->wng = setup_default_wng();
 702         else
 703                 s->wng = wng_new(a->num_writers);
 704         if (s->fc) {
 705                 s->wng->buf = s->fc->outbuf;
 706                 s->wng->loaded = s->fc->out_loaded;
 707                 s->wng->input_eof = &s->fc->eof;
 708                 s->fc->output_eof = &s->wng->eof;
 709         } else {
 710                 s->wng->buf = s->receiver_node->buf;
 711                 s->wng->loaded = &s->receiver_node->loaded;
 712                 s->wng->input_eof = &s->receiver_node->eof;
 713         }
 714         s->wng->task.event_handler = wng_event_handler;
 715         for (i = 0; i < a->num_writers; i++) {
 716                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 717                 s->wng->writer_nodes[i].writer = a->writers[i];
 718                 sprintf(s->wng->writer_nodes[i].task.status, "writer_ node");
 719         }
 720         ret = wng_open(s->wng);
 721         s->wstime = *now;
 722         current_decoder = slot_num;
 723         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 724 }
 725
 726 void rn_event_handler(struct task *t)
 727 {
 728 //      struct receiver_node *rn = t->private_data;
 729         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 730         unregister_task(t);
 731 }
 732 static void open_receiver(int format)
 733 {
 734         struct audio_format_info *a = &afi[format];
 735         struct slot_info *s;
 736         int ret, slot_num;
 737         struct receiver_node *rn;
 738
 739         slot_num = get_empty_slot();
 740         if (slot_num < 0)
 741                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 742         s = &slot[slot_num];
 743         s->format = format;
 744         gettimeofday(&s->rtime, NULL);
 745         s->wtime = s->rtime;
 746         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 747         rn = s->receiver_node;
 748         rn->receiver = a->receiver;
 749         rn->conf = a->receiver_conf;
 750         ret = a->receiver->open(s->receiver_node);
 751         if (ret < 0) {
 752                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 753                         PARA_STRERROR(-ret));
 754                 free(s->receiver_node);
 755                 s->receiver_node = NULL;
 756                 return;
 757         }
 758         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 759                 audio_formats[s->format], a->receiver->name, slot_num);
 760         rn->task.private_data = s->receiver_node;
 761         PARA_NOTICE_LOG("rn = %p\n", rn->task.private_data);
 762         rn->task.pre_select = a->receiver->pre_select;
 763         rn->task.post_select = a->receiver->post_select;
 764         rn->task.event_handler = rn_event_handler;
 765         rn->task.flags = 0;
 766         sprintf(rn->task.status, "receiver node");
 767         register_task(&rn->task);
 768 }
 769
 770 static int is_frozen(int format)
 771 {
 772         struct timeval now;
 773         struct audio_format_info *a = &afi[format];
 774
 775         gettimeofday(&now, NULL);
 776         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 777 }
 778
 779 static void start_current_receiver(void)
 780 {
 781         int i;
 782
 783         if (!af_status)
 784                 return;
 785         i = get_audio_format_num(af_status);
 786         if (i < 0)
 787                 return;
 788         if ((decoder_running(i) & 1) || is_frozen(i))
 789                 return;
 790         open_receiver(i);
 791 }
 792
 793 static void compute_time_diff(const struct timeval *status_time)
 794 {
 795         struct timeval now, tmp, diff;
 796         static int count;
 797         int sign;
 798         const struct timeval max_deviation = {0, 500 * 1000};
 799         const int time_smooth = 5;
 800
 801         gettimeofday(&now, NULL);
 802         sign = tv_diff(status_time, &now, &diff);
 803 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 804 //                      sign, sa_time_diff_sign);
 805         if (!count) {
 806                 sa_time_diff_sign = sign;
 807                 sa_time_diff = diff;
 808                 count++;
 809                 return;
 810         }
 811         if (count > 5) {
 812                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 813                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 814                         PARA_WARNING_LOG("time diff jump: %lims\n",
 815                                 s * tv2ms(&tmp));
 816         }
 817         count++;
 818         sa_time_diff_sign = tv_convex_combination(
 819                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 820                 count > 10? sign : sign * time_smooth, &diff,
 821                 &tmp);
 822         sa_time_diff = tmp;
 823         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 824                 sign > 0? "+" : "-",
 825                 tv2ms(&diff),
 826                 sa_time_diff_sign ? "+" : "-",
 827                 tv2ms(&sa_time_diff)
 828         );
 829 }
 830
 831 static void check_stat_line(char *line)
 832 {
 833         int itemnum;
 834         size_t ilen = 0;
 835         long unsigned sec, usec;
 836         char *tmp;
 837
 838 //      PARA_INFO_LOG("line: %s\n", line);
 839         if (!line)
 840                 return;
 841         itemnum = stat_line_valid(line);
 842         if (itemnum < 0) {
 843                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 844                 return;
 845         }
 846         tmp = make_message("%s\n", line);
 847         stat_client_write(tmp, itemnum);
 848         free(tmp);
 849         free(stat_item_values[itemnum]);
 850         stat_item_values[itemnum] = para_strdup(line);
 851         ilen = strlen(status_item_list[itemnum]);
 852         switch (itemnum) {
 853         case SI_STATUS:
 854                 playing = strstr(line, "playing")? 1 : 0;
 855                 break;
 856         case SI_FORMAT:
 857                 free(af_status);
 858                 af_status = para_strdup(line + ilen + 1);
 859                 break;
 860         case SI_OFFSET:
 861                 offset_seconds = atoi(line + ilen + 1);
 862                 break;
 863         case SI_LENGTH:
 864                 length_seconds = atoi(line + ilen + 1);
 865                 break;
 866         case SI_STREAM_START:
 867                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 868                         server_stream_start.tv_sec = sec;
 869                         server_stream_start.tv_usec = usec;
 870                 }
 871                 break;
 872         case SI_CURRENT_TIME:
 873                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 874                         struct timeval tv = {sec, usec};
 875                         compute_time_diff(&tv);
 876                 }
 877                 break;
 878         }
 879 }
 880
 881 static void handle_signal(int sig)
 882 {
 883         switch (sig) {
 884         case SIGCHLD:
 885                 return check_sigchld();
 886         case SIGINT:
 887         case SIGTERM:
 888         case SIGHUP:
 889                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 890                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 891                 return;
 892         }
 893 }
 894
 895 static void check_timeouts(void)
 896 {
 897         struct timeval now;
 898         int slot_num, timeout = conf.stream_timeout_arg;
 899
 900         gettimeofday(&now, NULL);
 901         FOR_EACH_SLOT(slot_num) {
 902                 struct slot_info *s = &slot[slot_num];
 903                 if (s->format < 0)
 904                         continue;
 905                 /* check read time */
 906                 if (s->receiver_node &&
 907                         now.tv_sec > s->rtime.tv_sec + timeout) {
 908                         PARA_INFO_LOG("%s stream (slot %d) not ready\n",
 909                                 audio_formats[s->format], slot_num);
 910                         s->receiver_node->eof = 1;
 911                 }
 912         }
 913 }
 914
 915 static void close_decoder_if_idle(int slot_num)
 916 {
 917         struct slot_info *s = &slot[slot_num];
 918
 919         if (s->format < 0)
 920                 return;
 921         if (!s->fc)
 922                 return;
 923         if (s->wng)
 924                 return;
 925         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 926                 slot_num, s->fc);
 927         close_filters(s->fc);
 928         free(s->fc);
 929         close_receiver(slot_num);
 930         clear_slot(slot_num);
 931 }
 932
 933 static void audiod_pre_select(__a_unused struct sched *s, __a_unused struct task *t)
 934 {
 935         int i;
 936
 937         if (audiod_status != AUDIOD_ON)
 938                 kill_all_decoders();
 939         else if (playing)
 940                 start_current_receiver();
 941         check_timeouts();
 942         FOR_EACH_SLOT(i) {
 943                 struct receiver_node *rn;
 944
 945                 close_decoder_if_idle(i);
 946                 if (slot[i].format < 0)
 947                         continue;
 948                 rn = slot[i].receiver_node;
 949                 if (rn && rn->loaded && !slot[i].wng) {
 950                         PARA_INFO_LOG("no writer in slot %d\n", i);
 951                         start_stream_writer(i, &s->now);
 952                 }
 953         }
 954 }
 955
 956 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 957 {
 958         int i;
 959
 960         FOR_EACH_SLOT(i) {
 961                 struct receiver_node *rn = slot[i].receiver_node;
 962
 963                 if (rn && rn->loaded)
 964                         slot[i].rtime = s->now;
 965         }
 966 }
 967
 968 static void init_audiod_task(struct audiod_task *at)
 969 {
 970         at->task.pre_select = audiod_pre_select;
 971         at->task.post_select = audiod_post_select;
 972         at->task.private_data = at;
 973         at->task.flags = 0;
 974         sprintf(at->task.status, "audiod task");
 975 }
 976
 977 static int parse_stream_command(const char *txt, char **cmd)
 978 {
 979         char *p = strchr(txt, ':');
 980         int i;
 981
 982         if (!p)
 983                 return -E_MISSING_COLON;
 984         p++;
 985         FOR_EACH_AUDIO_FORMAT(i) {
 986                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 987                         continue;
 988                 *cmd = p;
 989                 return i;
 990         }
 991         return -E_UNSUPPORTED_AUDIO_FORMAT;
 992 }
 993
 994 static int add_filter(int format, char *cmdline)
 995 {
 996         struct audio_format_info *a = &afi[format];
 997         int filter_num, nf = a->num_filters;
 998
 999         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1000         if (filter_num < 0)
1001                 return filter_num;
1002         a->filters[nf] = &filters[filter_num];
1003         a->num_filters++;
1004         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1005                 a->filters[nf]->name);
1006         return filter_num;
1007 }
1008
1009 static int setup_default_filters(void)
1010 {
1011         int i, ret = 1;
1012
1013         FOR_EACH_AUDIO_FORMAT(i) {
1014                 struct audio_format_info *a = &afi[i];
1015                 char *tmp;
1016                 int j;
1017                 if (a->num_filters)
1018                         continue;
1019                 /* add "dec" to audio format name */
1020                 tmp = make_message("%sdec", audio_formats[i]);
1021                 for (j = 0; filters[j].name; j++)
1022                         if (!strcmp(tmp, filters[j].name))
1023                                 break;
1024                 free(tmp);
1025                 ret = -E_UNSUPPORTED_FILTER;
1026                 if (!filters[j].name)
1027                         goto out;
1028                 tmp = para_strdup(filters[j].name);
1029                 ret = add_filter(i, tmp);
1030                 free(tmp);
1031                 if (ret < 0)
1032                         goto out;
1033                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1034                         filters[j].name);
1035                 ret = add_filter(i, "wav");
1036                 if (ret < 0)
1037                         goto out;
1038                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1039         }
1040 out:
1041         return ret;
1042 }
1043
1044 static int init_stream_io(void)
1045 {
1046         int i, ret, receiver_num, nf, nw;
1047         char *cmd;
1048         struct audio_format_info *a;
1049
1050         init_supported_writers();
1051         nw = PARA_MAX(1, conf.writer_given);
1052         PARA_INFO_LOG("allocating space for %d writers\n", nw);
1053         FOR_EACH_AUDIO_FORMAT(i) {
1054                 a = &afi[i];
1055                 a->writer_conf = para_malloc(nw * sizeof(void *));
1056                 a->writers = para_malloc(nw * sizeof(struct writer *));
1057                 a->num_writers = 0;
1058         }
1059         for (i = 0; i < conf.writer_given; i++) {
1060                 void *wconf;
1061                 int writer_num;
1062                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1063                 if (ret < 0)
1064                         goto out;
1065                 a = &afi[ret];
1066                 nw = a->num_writers;
1067                 wconf = check_writer_arg(cmd, &writer_num);
1068                 if (!wconf) {
1069                         ret = writer_num;
1070                         goto out;
1071                 }
1072                 a->writers[nw] = &writers[ret];
1073                 a->writer_conf[nw] = wconf;
1074                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1075                         nw, writer_names[writer_num]);
1076                 a->num_writers++;
1077         }
1078         for (i = 0; receivers[i].name; i++) {
1079                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1080                 receivers[i].init(&receivers[i]);
1081         }
1082         for (i = 0; i < conf.receiver_given; i++) {
1083                 char *arg = conf.receiver_arg[i];
1084                 char *recv = strchr(arg, ':');
1085                 ret = -E_MISSING_COLON;
1086                 if (!recv)
1087                         goto out;
1088                 *recv = '\0';
1089                 recv++;
1090                 ret = get_audio_format_num(arg);
1091                 if (ret < 0)
1092                         goto out;
1093                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1094                 if (!afi[ret].receiver_conf) {
1095                         ret = -E_RECV_SYNTAX;
1096                         goto out;
1097                 }
1098                 afi[ret].receiver = &receivers[receiver_num];
1099         }
1100         /* use the first available receiver with no arguments
1101          * for those audio formats for which no receiver
1102          * was specified
1103          */
1104         cmd = para_strdup(receivers[0].name);
1105         FOR_EACH_AUDIO_FORMAT(i) {
1106                 a = &afi[i];
1107                 if (a->receiver_conf)
1108                         continue;
1109                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1110                 if (!a->receiver_conf)
1111                         return -E_RECV_SYNTAX;
1112                 a->receiver = &receivers[receiver_num];
1113         }
1114         free(cmd);
1115         /* filters */
1116         filter_init(filters);
1117         nf = PARA_MAX(2,  conf.filter_given) + 1;
1118         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1119         FOR_EACH_AUDIO_FORMAT(i) {
1120                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1121                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1122         }
1123         if (!conf.no_default_filters_given)
1124                 return setup_default_filters();
1125         for (i = 0; i < conf.filter_given; i++) {
1126                 char *arg = conf.filter_arg[i];
1127                 char *filter_name = strchr(arg, ':');
1128                 ret = -E_MISSING_COLON;
1129                 if (!filter_name)
1130                         goto out;
1131                 *filter_name = '\0';
1132                 filter_name++;
1133                 ret = get_audio_format_num(arg);
1134                 if (ret < 0)
1135                         goto out;
1136                 ret = add_filter(ret, filter_name);
1137                 if (ret < 0)
1138                         goto out;
1139         }
1140         ret = 1;
1141 out:
1142         return ret;
1143 }
1144
1145 static int dump_commands(int fd)
1146 {
1147         char *buf = para_strdup(""), *tmp = NULL;
1148         int i;
1149         ssize_t ret;
1150
1151         FOR_EACH_COMMAND(i) {
1152                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1153                         cmds[i].description);
1154                 free(buf);
1155                 buf = tmp;
1156         }
1157         ret = client_write(fd, buf);
1158         free(buf);
1159         return ret;
1160 }
1161
1162 /*
1163  * command handlers don't close their fd on errors (ret < 0) so that
1164  * its caller can send an error message. Otherwise (ret >= 0) it's up
1165  * to each individual command to close the fd if necessary.
1166  */
1167
1168 static int com_help(int fd, int argc, char **argv)
1169 {
1170         int i, ret;
1171         char *buf;
1172         const char *dflt = "No such command. Available commands:\n";
1173
1174         if (argc < 2) {
1175                 ret = dump_commands(fd);
1176                 goto out;
1177         }
1178         FOR_EACH_COMMAND(i) {
1179                 if (strcmp(cmds[i].name, argv[1]))
1180                         continue;
1181                 buf = make_message(
1182                         "NAME\n\t%s -- %s\n"
1183                         "SYNOPSIS\n\tpara_audioc %s\n"
1184                         "DESCRIPTION\n%s\n",
1185                         argv[1],
1186                         cmds[i].description,
1187                         cmds[i].synopsis,
1188                         cmds[i].help
1189                 );
1190                 ret = client_write(fd, buf);
1191                 free(buf);
1192                 goto out;
1193         }
1194         ret = client_write(fd, dflt);
1195         if (ret > 0)
1196                 ret = dump_commands(fd);
1197 out:
1198         if (ret >= 0)
1199                 close(fd);
1200         return ret;
1201 }
1202
1203 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1204 {
1205         int i, ret;
1206         char *buf = NULL;
1207         long unsigned mask = ~0LU;
1208
1209         if (argc > 1) {
1210                 mask = 0;
1211                 for (i = 1; i < argc; i++) {
1212                         ret = stat_item_valid(argv[i]);
1213                         if (ret < 0)
1214                                 return ret;
1215                         mask |= (1 << ret);
1216                 }
1217         }
1218         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1219         if (mask & (1 << SI_PLAY_TIME)) {
1220                 struct timeval *t = wstime();
1221                 char *ts = get_time_string(t);
1222                 if (ts) {
1223                         ret = client_write(fd, ts);
1224                         if (ret < 0)
1225                                 goto out;
1226                         free(ts);
1227                 }
1228         }
1229         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1230                 char *tmp, *us = uptime_str();
1231                 tmp = make_message("%s:%s\n",
1232                         status_item_list[SI_AUDIOD_UPTIME], us);
1233                 free(us);
1234                 ret = client_write(fd, tmp);
1235                 if (ret < 0)
1236                         goto out;
1237                 free(tmp);
1238         }
1239         if (mask & (1 << SI_AUDIOD_STATUS)) {
1240                 char *s = audiod_status_string();
1241                 ret = client_write(fd, s);
1242                 if (ret < 0)
1243                         goto out;
1244                 free(s);
1245         }
1246         if (mask & (1 << SI_DECODER_FLAGS)) {
1247                 char *df =decoder_flags();
1248                 ret = client_write(fd, df);
1249                 if (ret < 0)
1250                         goto out;
1251                 free(df);
1252         }
1253
1254         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1255                 char *tmp, *v;
1256                 if (!((1 << i) & mask))
1257                         continue;
1258                 v = stat_item_values[i];
1259                 tmp = make_message("%s%s%s", buf? buf: "",
1260                         v? v : "", v? "\n" : "");
1261                 free(buf);
1262                 buf = tmp;
1263         }
1264         ret = client_write(fd, buf);
1265 out:
1266         if (ret > 0)
1267                 ret = stat_client_add(fd, mask);
1268         free(buf);
1269         return ret;
1270 }
1271
1272 static int com_grab(int fd, char *cmdline)
1273 {
1274         struct grab_client *gc;
1275         struct filter_node *fn;
1276         int i, err;
1277         char *msg;
1278
1279         gc = grab_client_new(fd, cmdline, &err);
1280         if (!gc)
1281                 goto err_out;
1282         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1283         if (fn)
1284                 activate_grab_client(gc, fn);
1285         return 1;
1286 err_out:
1287         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1288                 return err;
1289         if (err == -E_GC_HELP_GIVEN) {
1290                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1291                 for (i = 0; grab_client_args_info_help[i]; i++) {
1292                         char *tmp = make_message("%s%s\n", msg,
1293                                 grab_client_args_info_help[i]);
1294                         free(msg);
1295                         msg = tmp;
1296                 }
1297         } else
1298                 msg = make_message("%s %s\n",
1299                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1300                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1301         err = client_write(fd, msg);
1302         free(msg);
1303         if (err < 0)
1304                 return err;
1305         close(fd);
1306         return 1;
1307 }
1308
1309 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1310 {
1311         close(fd);
1312         clean_exit(EXIT_SUCCESS, "terminating on user request");
1313 }
1314
1315 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1316 {
1317         audiod_status = AUDIOD_ON;
1318         close(fd);
1319         return 1;
1320 }
1321
1322 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1323 {
1324         audiod_status = AUDIOD_OFF;
1325         close(fd);
1326         return 1;
1327 }
1328
1329 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1330 {
1331         audiod_status = AUDIOD_STANDBY;
1332         close(fd);
1333         return 1;
1334 }
1335
1336 static int com_cycle(int fd, int argc, char **argv)
1337 {
1338         switch (audiod_status) {
1339                 case  AUDIOD_ON:
1340                         return com_sb(fd, argc, argv);
1341                         break;
1342                 case  AUDIOD_OFF:
1343                         return com_on(fd, argc, argv);
1344                         break;
1345                 case  AUDIOD_STANDBY:
1346                         return com_off(fd, argc, argv);
1347                         break;
1348         }
1349         close(fd);
1350         return 1;
1351 }
1352
1353 static int check_perms(uid_t uid)
1354 {
1355         int i;
1356
1357         if (!conf.user_allow_given)
1358                 return 1;
1359         for (i = 0; i < conf.user_allow_given; i++)
1360                 if (uid == conf.user_allow_arg[i])
1361                         return 1;
1362         return -E_UCRED_PERM;
1363 }
1364
1365 static int handle_connect(void)
1366 {
1367         int i, argc, ret, clifd = -1;
1368         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1369         struct sockaddr_un unix_addr;
1370
1371         ret = para_accept(cmd_task->fd, &unix_addr, sizeof(struct sockaddr_un));
1372         if (ret < 0)
1373                 goto out;
1374         clifd = ret;
1375         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1376         if (ret < 0)
1377                 goto out;
1378         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1379         ret = check_perms(ret);
1380         if (ret < 0)
1381                 goto out;
1382         ret = -E_INVALID_AUDIOD_CMD;
1383         cmd = para_strdup(buf);
1384         p = strchr(cmd, '\n');
1385         if (!p)
1386                 p = "";
1387         else {
1388                 *p = '\0';
1389                 p++;
1390         }
1391         for (i = 0; cmds[i].name; i++) {
1392                 int j;
1393                 if (strcmp(cmds[i].name, cmd))
1394                         continue;
1395                 if (cmds[i].handler) {
1396                         argc = split_args(buf, &argv, "\n");
1397                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1398                         ret = cmds[i].handler(clifd, argc, argv);
1399                         goto out;
1400                 }
1401                 for (j = 0; p[j]; j++)
1402                         if (p[j] == '\n')
1403                                 p[j] = ' ';
1404                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1405                 ret = cmds[i].line_handler(clifd, p);
1406                 goto out;
1407         }
1408         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1409 out:
1410         free(cmd);
1411         free(buf);
1412         free(argv);
1413         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1414                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1415                 client_write(clifd, tmp);
1416                 free(tmp);
1417                 close(clifd);
1418         }
1419         return ret;
1420 }
1421
1422 static void audiod_get_socket(void)
1423 {
1424         struct sockaddr_un unix_addr;
1425
1426         if (conf.socket_given)
1427                 socket_name = para_strdup(conf.socket_arg);
1428         else {
1429                 char *hn = para_hostname();
1430                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1431                         hn);
1432                 free(hn);
1433         }
1434         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1435         if (conf.force_given)
1436                 unlink(socket_name);
1437         cmd_task->fd = create_pf_socket(socket_name, &unix_addr,
1438                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1439         if (cmd_task->fd < 0) {
1440                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1441                 exit(EXIT_FAILURE); /* do not unlink socket */
1442         }
1443         if (listen(cmd_task->fd , 5) < 0) {
1444                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1445                 exit(EXIT_FAILURE); /* do not unlink socket */
1446         }
1447         add_close_on_fork_list(cmd_task->fd);
1448 }
1449
1450 static int open_stat_pipe(void)
1451 {
1452         int ret, fd[3] = {-1, 1, 0};
1453         pid_t pid;
1454         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1455         if (ret >= 0) {
1456                 ret = fd[1];
1457                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1458                 add_close_on_fork_list(ret);
1459         } else
1460                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1461         return ret;
1462 }
1463
1464 void signal_event_handler(struct task *t)
1465 {
1466         struct signal_task *st = t->private_data;
1467         handle_signal(st->signum);
1468 }
1469
1470 void signal_pre_select(struct sched *s, struct task *t)
1471 {
1472         struct signal_task *st = t->private_data;
1473         t->ret = 1;
1474         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1475 }
1476
1477 void signal_post_select(struct sched *s, struct task *t)
1478 {
1479         struct signal_task *st = t->private_data;
1480         t->ret = 1;
1481         if (!FD_ISSET(st->fd, &s->rfds))
1482                 return;
1483         t->ret = -E_SIGNAL_CAUGHT;
1484         st->signum = para_next_signal();
1485 }
1486
1487 void signal_setup_default(struct signal_task *st)
1488 {
1489         st->task.pre_select = signal_pre_select;
1490         st->task.post_select = signal_post_select;
1491         st->task.private_data = st;
1492         st->task.flags = 0;
1493         sprintf(st->task.status, "signal task");
1494 }
1495
1496 static void command_pre_select(struct sched *s, struct task *t)
1497 {
1498         struct command_task *ct = t->private_data;
1499         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1500
1501 }
1502
1503 static void command_post_select(struct sched *s, struct task *t)
1504 {
1505         int ret;
1506         struct command_task *ct = t->private_data;
1507
1508         if (audiod_status != AUDIOD_OFF)
1509                 audiod_status_dump();
1510         t->ret = 1; /* always successful */
1511         if (!FD_ISSET(ct->fd, &s->rfds))
1512                 return;
1513         ret = handle_connect();
1514         if (ret < 0)
1515                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1516 }
1517
1518 void init_command_task(struct command_task *ct)
1519 {
1520         ct->task.pre_select = command_pre_select;
1521         ct->task.post_select = command_post_select;
1522         ct->task.private_data = ct;
1523         ct->task.flags = 0;
1524         sprintf(ct->task.status, "command task");
1525 }
1526
1527 static void status_pre_select(struct sched *s, struct task *t)
1528 {
1529         struct status_task *st = t->private_data;
1530         t->ret = 1;
1531         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1532                 close_stat_pipe();
1533         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1534                 st->fd = open_stat_pipe();
1535                 st->loaded = 0;
1536                 st->buf[0] = '\0';
1537         }
1538         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1539                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1540 }
1541
1542 static void status_post_select(struct sched *s, struct task *t)
1543 {
1544         struct status_task *st = t->private_data;
1545         int ret;
1546
1547         t->ret = 1;
1548         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1549                 return;
1550         ret = read(st->fd, st->buf + st->loaded,
1551                 STRINGSIZE - 1 - st->loaded);
1552         if (ret <= 0) {
1553                 close_stat_pipe();
1554                 /* avoid busy loop if server is down */
1555                 while (sleep(1) > 0)
1556                         ; /* try again*/
1557         } else {
1558                 st->buf[ret + st->loaded] = '\0';
1559                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1560                         &check_stat_line);
1561         }
1562 }
1563
1564 static void init_status_task(struct status_task *st)
1565 {
1566         st->task.pre_select = status_pre_select;
1567         st->task.post_select = status_post_select;
1568         st->task.private_data = st;
1569         st->task.flags = 0;
1570         st->loaded = 0;
1571         st->fd = -1;
1572         st->buf[0] = '\0';
1573         sprintf(st->task.status, "status task");
1574 }
1575
1576 static void set_initial_status(void)
1577 {
1578         audiod_status = AUDIOD_ON;
1579         if (!conf.mode_given)
1580                 return;
1581         if (!strcmp(conf.mode_arg, "sb")) {
1582                 audiod_status = AUDIOD_STANDBY;
1583                 return;
1584         }
1585         if (!strcmp(conf.mode_arg, "off")) {
1586                 audiod_status = AUDIOD_OFF;
1587                 return;
1588         }
1589         if (strcmp(conf.mode_arg, "on"))
1590                 PARA_WARNING_LOG("%s", "invalid mode\n");
1591 }
1592
1593 int main(int argc, char *argv[])
1594 {
1595         char *cf;
1596         int ret, i;
1597         struct sched s;
1598
1599         init_sched();
1600
1601         valid_fd_012();
1602         hostname = para_hostname();
1603         cmdline_parser(argc, argv, &conf);
1604         para_drop_privileges(conf.user_arg, conf.group_arg);
1605         cf = configfile_exists();
1606         if (cf) {
1607                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1608                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1609                         exit(EXIT_FAILURE);
1610                 }
1611         }
1612         if (conf.logfile_given)
1613                 logfile = open_log(conf.logfile_arg);
1614         log_welcome("para_audiod", conf.loglevel_arg);
1615         i = init_stream_io();
1616         if (i < 0) {
1617                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1618                 exit(EXIT_FAILURE);
1619         }
1620         server_uptime(UPTIME_SET);
1621         set_initial_status();
1622         FOR_EACH_SLOT(i)
1623                 clear_slot(i);
1624         init_grabbing();
1625         setup_signal_handling();
1626         if (conf.daemon_given)
1627                 daemon_init();
1628         audiod_get_socket(); /* doesn't return on errors */
1629
1630         signal_setup_default(sig_task);
1631         sig_task->task.event_handler = signal_event_handler;
1632
1633         init_status_task(stat_task);
1634         init_command_task(cmd_task);
1635         init_audiod_task(at);
1636
1637         register_task(&sig_task->task);
1638         register_task(&cmd_task->task);
1639         register_task(&stat_task->task);
1640         register_task(&at->task);
1641         s.default_timeout.tv_sec = 0;
1642         s.default_timeout.tv_usec = 99 * 1000;
1643         ret = sched(&s);
1644
1645         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1646         return EXIT_FAILURE;
1647 }