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         /** time of the last successful read from the receiver */
  87         struct timeval rtime;
  88         /** time the last write to the write fd happend */
  89         struct timeval wtime;
  90         /** writer start time */
  91         struct timeval wstime;
  92         /** the receiver info associated with this slot */
  93         struct receiver_node *receiver_node;
  94         /** the active filter chain */
  95         struct filter_chain *fc;
  96         /** the active writer node group */
  97         struct writer_node_group *wng;
  98 };
  99 static struct slot_info slot[MAX_STREAM_SLOTS];
 100
 101 extern const char *status_item_list[NUM_STAT_ITEMS];
 102
 103 static struct gengetopt_args_info conf;
 104 static struct timeval server_stream_start, sa_time_diff;
 105 static int playing, current_decoder = -1,
 106         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 107         sa_time_diff_sign = 1;
 108 static char *af_status, /* the audio format announced in server status */
 109         *socket_name, *hostname;
 110 static char *stat_item_values[NUM_STAT_ITEMS];
 111 static FILE *logfile;
 112 static const struct timeval restart_delay = {0, 300 * 1000};
 113 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 114 static struct timeval *now;
 115
 116 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 117
 118 struct command_task {
 119         int fd;
 120         struct task task;
 121 };
 122 static struct command_task command_task_struct, *cmd_task = &command_task_struct;
 123
 124 struct status_task {
 125         int fd;
 126         struct task task;
 127         char buf[STRINGSIZE];
 128         unsigned loaded;
 129 };
 130 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 131
 132 struct audiod_task {
 133         struct task task;
 134 };
 135 static struct audiod_task audiod_task_struct, *at = &audiod_task_struct;
 136
 137 struct signal_task {
 138         int fd;
 139         int signum;
 140         struct task task;
 141 };
 142
 143
 144 /** defines one command of para_audiod */
 145 struct audiod_command {
 146         /** the name of the command */
 147         const char *name;
 148         /** pointer to the function that handles the command */
 149         int (*handler)(int, int, char**);
 150         int (*line_handler)(int, char*);
 151         /** one-line description of the command */
 152         const char *description;
 153         /** summary of the command line options */
 154         const char *synopsis;
 155         /** the long help text */
 156         const char *help;
 157 };
 158 static int com_grab(int, char *);
 159 static int com_cycle(int, int, char **);
 160 static int com_help(int, int, char **);
 161 static int com_off(int, int, char **);
 162 static int com_on(int, int, char **);
 163 static int com_sb(int, int, char **);
 164 static int com_stat(int, int, char **);
 165 static int com_term(int, int, char **);
 166 static struct audiod_command cmds[] = {
 167 {
 168 .name = "cycle",
 169 .handler = com_cycle,
 170 .description = "switch to next mode",
 171 .synopsis = "cycle",
 172 .help =
 173
 174 "on -> standby -> off -> on\n"
 175
 176 },
 177 {
 178 .name = "grab",
 179 .line_handler = com_grab,
 180 .description = "grab the audio stream",
 181 .synopsis = "-- grab [grab_options]",
 182 .help =
 183
 184 "grab ('splice') the audio stream at any position in the filter      \n"
 185 "chain and send that data back to the client. Try\n"
 186 "\t para_audioc -- grab -h\n"
 187 "for the list of available options.\n"
 188 },
 189
 190 {
 191 .name = "help",
 192 .handler = com_help,
 193 .description = "display command list or help for given command",
 194 .synopsis = "help [command]",
 195 .help =
 196
 197 "When I was younger, so much younger than today, I never needed\n"
 198 "anybody's help in any way. But now these days are gone, I'm not so\n"
 199 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 200 "\n"
 201 "                               -- Beatles: Help\n"
 202
 203 },
 204 {
 205 .name = "off",
 206 .handler = com_off,
 207 .description = "deactivate para_audiod",
 208 .synopsis = "off",
 209 .help =
 210
 211 "Close connection to para_server and stop all decoders.\n"
 212
 213 },
 214 {
 215 .name = "on",
 216 .handler = com_on,
 217 .description = "activate para_audiod",
 218 .synopsis = "on",
 219 .help =
 220
 221 "Establish connection to para_server, retrieve para_server's current\n"
 222 "status. If playing, start corresponding decoder. Otherwise stop\n"
 223 "all decoders.\n"
 224
 225 },
 226 {
 227 .name = "sb",
 228 .handler = com_sb,
 229 .description = "enter standby mode",
 230 .synopsis = "sb",
 231 .help =
 232
 233 "Stop all decoders but leave connection to para_server open.\n"
 234
 235 },
 236 {
 237 .name = "stat",
 238 .handler = com_stat,
 239 .description = "print status information",
 240 .synopsis = "stat [item1 ...]",
 241 .help =
 242
 243 "Dump given status items (all if none given) to stdout.\n"
 244
 245 },
 246 {
 247 .name = "term",
 248 .handler = com_term,
 249 .description = "terminate audiod",
 250 .synopsis = "term",
 251 .help =
 252
 253 "Stop all decoders, shut down connection to para_server and exit.\n"
 254
 255 },
 256 {
 257 .name = NULL,
 258 }
 259 };
 260
 261 /** iterate over all slots */
 262 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 263 /** iterate over all supported audio formats */
 264 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 265 /** iterate over the array of all audiod commands */
 266 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 267
 268 /**
 269  * get the audio format number
 270  * \param name the name of the audio format
 271  *
 272  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 273  * \a name is not a supported audio format.
 274  */
 275 int get_audio_format_num(char *name)
 276 {
 277         int i;
 278         FOR_EACH_AUDIO_FORMAT(i)
 279                 if (!strcmp(name, audio_formats[i]))
 280                         return i;
 281         return -E_UNSUPPORTED_AUDIO_FORMAT;
 282 }
 283
 284 /*
 285  * log function. first argument is loglevel.
 286  */
 287 void para_log(int ll, const char* fmt,...)
 288 {
 289         va_list argp;
 290         FILE *outfd;
 291         struct tm *tm;
 292         time_t t1;
 293         char str[MAXLINE] = "";
 294
 295         if (ll < conf.loglevel_arg)
 296                 return;
 297         outfd = logfile? logfile : stderr;
 298         time(&t1);
 299         tm = localtime(&t1);
 300         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 301         fprintf(outfd, "%s %s ", str, hostname);
 302         if (conf.loglevel_arg <= INFO)
 303                 fprintf(outfd, "%i ", ll);
 304         va_start(argp, fmt);
 305         vfprintf(outfd, fmt, argp);
 306         va_end(argp);
 307 }
 308
 309 static int client_write(int fd, const char *buf)
 310 {
 311         size_t len = strlen(buf);
 312         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 313 }
 314
 315 static char *get_time_string(struct timeval *newest_stime)
 316 {
 317         struct timeval diff, adj_stream_start, tmp;
 318         int total = 0, use_server_time = 1;
 319
 320         if (!playing) {
 321                 if (length_seconds)
 322                         return NULL;
 323                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 324         }
 325         if (audiod_status == AUDIOD_OFF)
 326                 goto out;
 327         if (sa_time_diff_sign > 0)
 328                 tv_diff(&server_stream_start, &sa_time_diff,
 329                         &adj_stream_start);
 330         else
 331                 tv_add(&server_stream_start, &sa_time_diff,
 332                         &adj_stream_start);
 333         tmp = adj_stream_start;
 334         if (newest_stime && audiod_status == AUDIOD_ON) {
 335                 tv_diff(newest_stime, &adj_stream_start, &diff);
 336                 if (tv2ms(&diff) < 5000) {
 337                         tmp = *newest_stime;
 338                         use_server_time = 0;
 339                 }
 340         }
 341         tv_diff(now, &tmp, &diff);
 342         total = diff.tv_sec + offset_seconds;
 343         if (total > length_seconds)
 344                 total = length_seconds;
 345         if (total < 0)
 346                 total = 0;
 347 out:
 348         return make_message(
 349                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 350                 status_item_list[SI_PLAY_TIME],
 351                 use_server_time? "~" : "",
 352                 total / 60,
 353                 total % 60,
 354                 (length_seconds - total) / 60,
 355                 (length_seconds - total) % 60,
 356                 length_seconds? (total * 100 + length_seconds / 2) /
 357                         length_seconds : 0,
 358                 length_seconds / 60,
 359                 length_seconds % 60
 360         );
 361 }
 362
 363 __malloc static char *audiod_status_string(void)
 364 {
 365         const char *status = (audiod_status == AUDIOD_ON)?
 366                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 367         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 368 }
 369
 370 static struct timeval *wstime(void)
 371 {
 372         int i;
 373         struct timeval *max = NULL;
 374         FOR_EACH_SLOT(i) {
 375                 struct slot_info *s = &slot[i];
 376                 if (!s->wng)
 377                         continue;
 378                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 379                         continue;
 380                 max = &s->wstime;
 381         }
 382         return max;
 383 }
 384 __malloc static char *decoder_flags(void)
 385 {
 386         int i;
 387         char decoder_flags[MAX_STREAM_SLOTS + 1];
 388
 389         FOR_EACH_SLOT(i) {
 390                 struct slot_info *s = &slot[i];
 391                 char flag = '0';
 392                 if (s->receiver_node)
 393                         flag += 1;
 394                 if (s->wng)
 395                         flag += 2;
 396                 decoder_flags[i] = flag;
 397         }
 398         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 399         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 400                 decoder_flags);
 401 }
 402
 403 static char *configfile_exists(void)
 404 {
 405         static char *config_file;
 406
 407         if (!config_file) {
 408                 char *home = para_homedir();
 409                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 410                 free(home);
 411         }
 412         return file_exists(config_file)? config_file : NULL;
 413 }
 414
 415 static void setup_signal_handling(void)
 416 {
 417         sig_task->fd = para_signal_init();
 418         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 419         para_install_sighandler(SIGINT);
 420         para_install_sighandler(SIGTERM);
 421         para_install_sighandler(SIGCHLD);
 422         para_install_sighandler(SIGHUP);
 423         signal(SIGPIPE, SIG_IGN);
 424 }
 425
 426 static void audiod_status_dump(void)
 427 {
 428         static char *p_ts, *p_us, *p_as, *p_df;
 429         struct timeval *t = wstime();
 430         char *us, *tmp = get_time_string(t);
 431
 432         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 433                 stat_client_write(tmp, SI_PLAY_TIME);
 434         free(p_ts);
 435         p_ts = tmp;
 436
 437         us = uptime_str();
 438         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 439         free(us);
 440         if (!p_us || strcmp(p_us, tmp))
 441                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 442         free(p_us);
 443         p_us = tmp;
 444
 445         tmp = audiod_status_string();
 446         if (!p_as || strcmp(p_as, tmp))
 447                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 448         free(p_as);
 449         p_as = tmp;
 450
 451         tmp = decoder_flags();
 452         if (!p_df || strcmp(p_df, tmp))
 453                 stat_client_write(tmp, SI_DECODER_FLAGS);
 454         free(p_df);
 455         p_df = tmp;
 456 }
 457
 458 static void clear_slot(int slot_num)
 459 {
 460         struct slot_info *s = &slot[slot_num];
 461
 462         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 463         memset(s, 0, sizeof(struct slot_info));
 464         s->format = -1;
 465 }
 466
 467 static void close_receiver(int slot_num)
 468 {
 469         struct slot_info *s = &slot[slot_num];
 470         struct audio_format_info *a;
 471
 472         if (s->format < 0 || !s->receiver_node)
 473                 return;
 474         a = &afi[s->format];
 475         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 476                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 477         if (!s->receiver_node->eof)
 478                 unregister_task(&s->receiver_node->task);
 479         a->receiver->close(s->receiver_node);
 480         free(s->receiver_node);
 481         s->receiver_node = NULL;
 482         /* set restart barrier */
 483         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 484 }
 485
 486 static void kill_all_decoders(void)
 487 {
 488         int i;
 489
 490         FOR_EACH_SLOT(i) {
 491                 struct slot_info *s = &slot[i];
 492                 if (s->receiver_node)
 493                         s->receiver_node->eof = 1;
 494         }
 495 }
 496
 497 static int get_empty_slot(void)
 498 {
 499         int i;
 500         struct slot_info *s;
 501
 502         FOR_EACH_SLOT(i) {
 503                 s = &slot[i];
 504                 if (s->format < 0) {
 505                         clear_slot(i);
 506                         return i;
 507                 }
 508                 if (s->wng || s->receiver_node || s->fc)
 509                         continue;
 510                 clear_slot(i);
 511                 return i;
 512         }
 513         return -E_NO_MORE_SLOTS;
 514 }
 515
 516 static int decoder_running(int format)
 517 {
 518         int i, ret = 0;
 519         struct slot_info *s;
 520
 521         FOR_EACH_SLOT(i) {
 522                 s = &slot[i];
 523                 if (s->format == format && s->receiver_node)
 524                         ret |= 1;
 525                 if (s->format == format && s->wng)
 526                         ret |= 2;
 527         }
 528         return ret;
 529 }
 530
 531 static void close_stat_pipe(void)
 532 {
 533         int i;
 534
 535         if (stat_task->fd < 0)
 536                 return;
 537         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 538         close(stat_task->fd);
 539         del_close_on_fork_list(stat_task->fd);
 540         stat_task->fd = -1;
 541         kill_all_decoders();
 542         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 543                 free(stat_item_values[i]);
 544                 stat_item_values[i] = NULL;
 545         }
 546         dump_empty_status();
 547         length_seconds = 0;
 548         offset_seconds = 0;
 549         audiod_status_dump();
 550         playing = 0;
 551         stat_item_values[SI_STATUS_BAR] = make_message(
 552                 "%s:no connection to para_server\n",
 553                 status_item_list[SI_STATUS_BAR]);
 554         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 555 }
 556
 557 static void __noreturn clean_exit(int status, const char *msg)
 558 {
 559         PARA_EMERG_LOG("%s\n", msg);
 560         kill_all_decoders();
 561         if (socket_name)
 562                 unlink(socket_name);
 563         if (stat_task->fd >= 0)
 564                 close_stat_pipe();
 565         exit(status);
 566 }
 567
 568 /**
 569  * get the number of filters
 570  *
 571  * \param audio_format_num the number identifying the audio format
 572  *
 573  * \return the number of filters for the given audio format
 574  *
 575  * \sa struct filter;
 576  */
 577 int num_filters(int audio_format_num)
 578 {
 579         return afi[audio_format_num].num_filters;
 580 }
 581
 582 static void filter_event_handler(struct task *t)
 583 {
 584         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 585         unregister_task(t);
 586 }
 587
 588 static void open_filters(int slot_num)
 589 {
 590         struct slot_info *s = &slot[slot_num];
 591         struct audio_format_info *a = &afi[s->format];
 592         int nf = a->num_filters;
 593         int i;
 594
 595         s->fc = NULL;
 596         if (!nf)
 597                 return;
 598         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 599         s->fc = para_calloc(sizeof(struct filter_chain));
 600         INIT_LIST_HEAD(&s->fc->filters);
 601         s->fc->inbuf = s->receiver_node->buf;
 602         s->fc->in_loaded = &s->receiver_node->loaded;
 603         s->fc->input_eof = &s->receiver_node->eof;
 604
 605         s->fc->task.pre_select = filter_pre_select;
 606         s->fc->task.event_handler = filter_event_handler;
 607         s->fc->task.private_data = s->fc;
 608         s->fc->task.flags = 0;
 609         s->fc->eof = 0;
 610         sprintf(s->fc->task.status, "filter chain");
 611         for (i = 0; i < nf; i++) {
 612                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 613                 fn->conf = a->filter_conf[i];
 614                 fn->fc = s->fc;
 615                 fn->filter = a->filters[i];
 616                 INIT_LIST_HEAD(&fn->callbacks);
 617                 list_add_tail(&fn->node, &s->fc->filters);
 618                 fn->filter->open(fn);
 619                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 620                         audio_formats[s->format], i + 1,  nf,
 621                         fn->filter->name, slot_num);
 622                 s->fc->outbuf = fn->buf;
 623                 s->fc->out_loaded = &fn->loaded;
 624         }
 625         register_task(&s->fc->task);
 626 //      PARA_DEBUG_LOG("output loaded for filter chain %p: %p\n", s->fc,
 627 //              s->fc->out_loaded);
 628 }
 629
 630 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 631 {
 632         struct filter_node *fn;
 633         int i, j;
 634
 635         FOR_EACH_SLOT(i) {
 636                 struct slot_info *s = &slot[i];
 637                 if (s->format < 0 || !s->fc)
 638                         continue;
 639                 if (slot_num >= 0 && slot_num != i)
 640                         continue;
 641                 if (format >= 0 && s->format != format)
 642                         continue;
 643                 if (num_filters(i) < filternum)
 644                         continue;
 645                 /* success */
 646                 j = 1;
 647                 list_for_each_entry(fn, &s->fc->filters, node)
 648                         if (filternum <= 0 || j++ == filternum)
 649                                 break;
 650                 return fn;
 651         }
 652         return NULL;
 653 }
 654
 655 static void wng_event_handler(struct task *t)
 656 {
 657         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 658         unregister_task(t);
 659 }
 660
 661 static void open_writers(int slot_num)
 662 {
 663         int ret, i;
 664         struct slot_info *s = &slot[slot_num];
 665         struct audio_format_info *a = &afi[s->format];
 666
 667         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 668         if (!a->num_writers)
 669                 s->wng = setup_default_wng();
 670         else
 671                 s->wng = wng_new(a->num_writers);
 672         if (s->fc) {
 673                 s->wng->buf = s->fc->outbuf;
 674                 s->wng->loaded = s->fc->out_loaded;
 675                 s->wng->input_eof = &s->fc->eof;
 676                 s->fc->output_eof = &s->wng->eof;
 677         } else {
 678                 s->wng->buf = s->receiver_node->buf;
 679                 s->wng->loaded = &s->receiver_node->loaded;
 680                 s->wng->input_eof = &s->receiver_node->eof;
 681         }
 682         s->wng->task.event_handler = wng_event_handler;
 683         for (i = 0; i < a->num_writers; i++) {
 684                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 685                 s->wng->writer_nodes[i].writer = a->writers[i];
 686                 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
 687         }
 688         ret = wng_open(s->wng);
 689         s->wstime = *now;
 690         current_decoder = slot_num;
 691         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 692 }
 693
 694 static void rn_event_handler(struct task *t)
 695 {
 696 //      struct receiver_node *rn = t->private_data;
 697         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 698         unregister_task(t);
 699 }
 700
 701 static void open_receiver(int format)
 702 {
 703         struct audio_format_info *a = &afi[format];
 704         struct slot_info *s;
 705         int ret, slot_num;
 706         struct receiver_node *rn;
 707
 708         slot_num = get_empty_slot();
 709         if (slot_num < 0)
 710                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 711         s = &slot[slot_num];
 712         s->format = format;
 713         s->rtime = *now;
 714         s->wtime = s->rtime;
 715         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 716         rn = s->receiver_node;
 717         rn->receiver = a->receiver;
 718         rn->conf = a->receiver_conf;
 719         ret = a->receiver->open(s->receiver_node);
 720         if (ret < 0) {
 721                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 722                         PARA_STRERROR(-ret));
 723                 free(s->receiver_node);
 724                 s->receiver_node = NULL;
 725                 return;
 726         }
 727         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 728                 audio_formats[s->format], a->receiver->name, slot_num);
 729         rn->task.private_data = s->receiver_node;
 730         rn->task.pre_select = a->receiver->pre_select;
 731         rn->task.post_select = a->receiver->post_select;
 732         rn->task.event_handler = rn_event_handler;
 733         rn->task.flags = 0;
 734         sprintf(rn->task.status, "receiver node");
 735         register_task(&rn->task);
 736 }
 737
 738 static int is_frozen(int format)
 739 {
 740         struct audio_format_info *a = &afi[format];
 741
 742         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 743 }
 744
 745 static void open_current_receiver(void)
 746 {
 747         int i;
 748
 749         if (!af_status)
 750                 return;
 751         i = get_audio_format_num(af_status);
 752         if (i < 0)
 753                 return;
 754         if (decoder_running(i) || is_frozen(i))
 755                 return;
 756         open_receiver(i);
 757 }
 758
 759 static void compute_time_diff(const struct timeval *status_time)
 760 {
 761         struct timeval tmp, diff;
 762         static int count;
 763         int sign;
 764         const struct timeval max_deviation = {0, 500 * 1000};
 765         const int time_smooth = 5;
 766
 767         sign = tv_diff(status_time, now, &diff);
 768 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 769 //                      sign, sa_time_diff_sign);
 770         if (!count) {
 771                 sa_time_diff_sign = sign;
 772                 sa_time_diff = diff;
 773                 count++;
 774                 return;
 775         }
 776         if (count > 5) {
 777                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 778                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 779                         PARA_WARNING_LOG("time diff jump: %lims\n",
 780                                 s * tv2ms(&tmp));
 781         }
 782         count++;
 783         sa_time_diff_sign = tv_convex_combination(
 784                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 785                 count > 10? sign : sign * time_smooth, &diff,
 786                 &tmp);
 787         sa_time_diff = tmp;
 788         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 789                 sign > 0? "+" : "-",
 790                 tv2ms(&diff),
 791                 sa_time_diff_sign ? "+" : "-",
 792                 tv2ms(&sa_time_diff)
 793         );
 794 }
 795
 796 static void check_stat_line(char *line)
 797 {
 798         int itemnum;
 799         size_t ilen = 0;
 800         long unsigned sec, usec;
 801         char *tmp;
 802
 803 //      PARA_INFO_LOG("line: %s\n", line);
 804         if (!line)
 805                 return;
 806         itemnum = stat_line_valid(line);
 807         if (itemnum < 0) {
 808                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 809                 return;
 810         }
 811         tmp = make_message("%s\n", line);
 812         stat_client_write(tmp, itemnum);
 813         free(tmp);
 814         free(stat_item_values[itemnum]);
 815         stat_item_values[itemnum] = para_strdup(line);
 816         ilen = strlen(status_item_list[itemnum]);
 817         switch (itemnum) {
 818         case SI_STATUS:
 819                 playing = strstr(line, "playing")? 1 : 0;
 820                 break;
 821         case SI_FORMAT:
 822                 free(af_status);
 823                 af_status = para_strdup(line + ilen + 1);
 824                 break;
 825         case SI_OFFSET:
 826                 offset_seconds = atoi(line + ilen + 1);
 827                 break;
 828         case SI_LENGTH:
 829                 length_seconds = atoi(line + ilen + 1);
 830                 break;
 831         case SI_STREAM_START:
 832                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 833                         server_stream_start.tv_sec = sec;
 834                         server_stream_start.tv_usec = usec;
 835                 }
 836                 break;
 837         case SI_CURRENT_TIME:
 838                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 839                         struct timeval tv = {sec, usec};
 840                         compute_time_diff(&tv);
 841                 }
 842                 break;
 843         }
 844 }
 845
 846 static void handle_signal(int sig)
 847 {
 848         switch (sig) {
 849         case SIGCHLD:
 850                 for (;;) {
 851                         pid_t pid = para_reap_child();
 852                         if (pid <= 0)
 853                                 return;
 854                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 855                 }
 856         case SIGINT:
 857         case SIGTERM:
 858         case SIGHUP:
 859                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 860                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 861                 return;
 862         }
 863 }
 864
 865 static void check_timeouts(void)
 866 {
 867
 868         int slot_num, timeout = conf.stream_timeout_arg;
 869
 870         FOR_EACH_SLOT(slot_num) {
 871                 struct slot_info *s = &slot[slot_num];
 872                 if (s->format < 0)
 873                         continue;
 874                 /* check read time */
 875                 if (s->receiver_node &&
 876                         now->tv_sec > s->rtime.tv_sec + timeout) {
 877                         PARA_INFO_LOG("%s stream (slot %d) not ready\n",
 878                                 audio_formats[s->format], slot_num);
 879                         s->receiver_node->eof = 1;
 880                 }
 881         }
 882 }
 883
 884 static void try_to_close_slot(int slot_num)
 885 {
 886         struct slot_info *s = &slot[slot_num];
 887
 888         if (s->format < 0)
 889                 return;
 890         if (s->receiver_node && !s->receiver_node->eof)
 891                 return;
 892         if (s->fc && !s->fc->eof)
 893                 return;
 894         if (s->wng && !s->wng->eof)
 895                 return;
 896         PARA_INFO_LOG("closing slot %d \n", slot_num);
 897         wng_close(s->wng);
 898         wng_destroy(s->wng);
 899         close_filters(s->fc);
 900         free(s->fc);
 901         close_receiver(slot_num);
 902         clear_slot(slot_num);
 903 }
 904
 905 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 906 {
 907         int i;
 908
 909         now = &s->now;
 910         if (audiod_status != AUDIOD_ON)
 911                 kill_all_decoders();
 912         else if (playing)
 913                 open_current_receiver();
 914         check_timeouts();
 915         FOR_EACH_SLOT(i) {
 916                 struct receiver_node *rn;
 917
 918                 try_to_close_slot(i);
 919                 if (slot[i].format < 0)
 920                         continue;
 921                 rn = slot[i].receiver_node;
 922                 if (rn && rn->loaded && !slot[i].wng) {
 923                         open_filters(i);
 924                         open_writers(i);
 925                 }
 926         }
 927 }
 928
 929 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 930 {
 931         int i;
 932
 933         now = &s->now;
 934         FOR_EACH_SLOT(i) {
 935                 struct receiver_node *rn = slot[i].receiver_node;
 936
 937                 if (rn && rn->loaded)
 938                         slot[i].rtime = *now;
 939         }
 940 }
 941
 942 static void init_audiod_task(struct audiod_task *at)
 943 {
 944         at->task.pre_select = audiod_pre_select;
 945         at->task.post_select = audiod_post_select;
 946         at->task.private_data = at;
 947         at->task.flags = 0;
 948         sprintf(at->task.status, "audiod task");
 949 }
 950
 951 static int parse_stream_command(const char *txt, char **cmd)
 952 {
 953         char *p = strchr(txt, ':');
 954         int i;
 955
 956         if (!p)
 957                 return -E_MISSING_COLON;
 958         p++;
 959         FOR_EACH_AUDIO_FORMAT(i) {
 960                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 961                         continue;
 962                 *cmd = p;
 963                 return i;
 964         }
 965         return -E_UNSUPPORTED_AUDIO_FORMAT;
 966 }
 967
 968 static int add_filter(int format, char *cmdline)
 969 {
 970         struct audio_format_info *a = &afi[format];
 971         int filter_num, nf = a->num_filters;
 972
 973         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 974         if (filter_num < 0)
 975                 return filter_num;
 976         a->filters[nf] = &filters[filter_num];
 977         a->num_filters++;
 978         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 979                 a->filters[nf]->name);
 980         return filter_num;
 981 }
 982
 983 static int init_writers(void)
 984 {
 985         int i, ret, nw;
 986         char *cmd;
 987         struct audio_format_info *a;
 988
 989         init_supported_writers();
 990         nw = PARA_MAX(1, conf.writer_given);
 991         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 992         FOR_EACH_AUDIO_FORMAT(i) {
 993                 a = &afi[i];
 994                 a->writer_conf = para_malloc(nw * sizeof(void *));
 995                 a->writers = para_malloc(nw * sizeof(struct writer *));
 996                 a->num_writers = 0;
 997         }
 998         for (i = 0; i < conf.writer_given; i++) {
 999                 void *wconf;
1000                 int writer_num;
1001                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1002                 if (ret < 0)
1003                         goto out;
1004                 a = &afi[ret];
1005                 nw = a->num_writers;
1006                 wconf = check_writer_arg(cmd, &writer_num);
1007                 if (!wconf) {
1008                         ret = writer_num;
1009                         goto out;
1010                 }
1011                 a->writers[nw] = &writers[writer_num];
1012                 a->writer_conf[nw] = wconf;
1013                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1014                         nw, writer_names[writer_num]);
1015                 a->num_writers++;
1016         }
1017         ret = 1;
1018 out:
1019         return ret;
1020 }
1021
1022 static int init_receivers(void)
1023 {
1024         int i, ret, receiver_num;
1025         char *cmd = NULL;
1026         struct audio_format_info *a;
1027
1028         for (i = 0; receivers[i].name; i++) {
1029                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1030                 receivers[i].init(&receivers[i]);
1031         }
1032         for (i = 0; i < conf.receiver_given; i++) {
1033                 char *arg = conf.receiver_arg[i];
1034                 char *recv = strchr(arg, ':');
1035                 ret = -E_MISSING_COLON;
1036                 if (!recv)
1037                         goto out;
1038                 *recv = '\0';
1039                 recv++;
1040                 ret = get_audio_format_num(arg);
1041                 if (ret < 0)
1042                         goto out;
1043                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1044                 if (!afi[ret].receiver_conf) {
1045                         ret = -E_RECV_SYNTAX;
1046                         goto out;
1047                 }
1048                 afi[ret].receiver = &receivers[receiver_num];
1049         }
1050         /* use the first available receiver with no arguments
1051          * for those audio formats for which no receiver
1052          * was specified
1053          */
1054         cmd = para_strdup(receivers[0].name);
1055         FOR_EACH_AUDIO_FORMAT(i) {
1056                 a = &afi[i];
1057                 if (a->receiver_conf)
1058                         continue;
1059                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1060                 if (!a->receiver_conf)
1061                         return -E_RECV_SYNTAX;
1062                 a->receiver = &receivers[receiver_num];
1063         }
1064         ret = 1;
1065 out:
1066         free(cmd);
1067         return ret;
1068 }
1069
1070 static int init_default_filters(void)
1071 {
1072         int i, ret = 1;
1073
1074         FOR_EACH_AUDIO_FORMAT(i) {
1075                 struct audio_format_info *a = &afi[i];
1076                 char *tmp;
1077                 int j;
1078
1079                 if (a->num_filters)
1080                         continue; /* no default -- nothing to to */
1081                 /* add "dec" to audio format name */
1082                 tmp = make_message("%sdec", audio_formats[i]);
1083                 for (j = 0; filters[j].name; j++)
1084                         if (!strcmp(tmp, filters[j].name))
1085                                 break;
1086                 free(tmp);
1087                 ret = -E_UNSUPPORTED_FILTER;
1088                 if (!filters[j].name)
1089                         goto out;
1090                 tmp = para_strdup(filters[j].name);
1091                 ret = add_filter(i, tmp);
1092                 free(tmp);
1093                 if (ret < 0)
1094                         goto out;
1095                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1096                         filters[j].name);
1097         }
1098 out:
1099         return ret;
1100 }
1101
1102 static int init_filters(void)
1103 {
1104         int i, ret, nf;
1105
1106         filter_init(filters);
1107         nf = PARA_MAX(1,  conf.filter_given);
1108         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1109         FOR_EACH_AUDIO_FORMAT(i) {
1110                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1111                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1112         }
1113         if (!conf.no_default_filters_given)
1114                 return init_default_filters();
1115         for (i = 0; i < conf.filter_given; i++) {
1116                 char *arg = conf.filter_arg[i];
1117                 char *filter_name = strchr(arg, ':');
1118                 ret = -E_MISSING_COLON;
1119                 if (!filter_name)
1120                         goto out;
1121                 *filter_name = '\0';
1122                 filter_name++;
1123                 ret = get_audio_format_num(arg);
1124                 if (ret < 0)
1125                         goto out;
1126                 ret = add_filter(ret, filter_name);
1127                 if (ret < 0)
1128                         goto out;
1129         }
1130         ret = init_default_filters(); /* use default values for the rest */
1131 out:
1132         return ret;
1133 }
1134
1135 static int init_stream_io(void)
1136 {
1137         int ret;
1138
1139         ret = init_writers();
1140         if (ret < 0)
1141                 return ret;
1142         ret = init_receivers();
1143         if (ret < 0)
1144                 return ret;
1145         ret = init_filters();
1146         if (ret < 0)
1147                 return ret;
1148         return 1;
1149 }
1150
1151 static int dump_commands(int fd)
1152 {
1153         char *buf = para_strdup(""), *tmp = NULL;
1154         int i;
1155         ssize_t ret;
1156
1157         FOR_EACH_COMMAND(i) {
1158                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1159                         cmds[i].description);
1160                 free(buf);
1161                 buf = tmp;
1162         }
1163         ret = client_write(fd, buf);
1164         free(buf);
1165         return ret;
1166 }
1167
1168 /*
1169  * command handlers don't close their fd on errors (ret < 0) so that
1170  * its caller can send an error message. Otherwise (ret >= 0) it's up
1171  * to each individual command to close the fd if necessary.
1172  */
1173
1174 static int com_help(int fd, int argc, char **argv)
1175 {
1176         int i, ret;
1177         char *buf;
1178         const char *dflt = "No such command. Available commands:\n";
1179
1180         if (argc < 2) {
1181                 ret = dump_commands(fd);
1182                 goto out;
1183         }
1184         FOR_EACH_COMMAND(i) {
1185                 if (strcmp(cmds[i].name, argv[1]))
1186                         continue;
1187                 buf = make_message(
1188                         "NAME\n\t%s -- %s\n"
1189                         "SYNOPSIS\n\tpara_audioc %s\n"
1190                         "DESCRIPTION\n%s\n",
1191                         argv[1],
1192                         cmds[i].description,
1193                         cmds[i].synopsis,
1194                         cmds[i].help
1195                 );
1196                 ret = client_write(fd, buf);
1197                 free(buf);
1198                 goto out;
1199         }
1200         ret = client_write(fd, dflt);
1201         if (ret > 0)
1202                 ret = dump_commands(fd);
1203 out:
1204         if (ret >= 0)
1205                 close(fd);
1206         return ret;
1207 }
1208
1209 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1210 {
1211         int i, ret;
1212         char *buf = NULL;
1213         long unsigned mask = ~0LU;
1214
1215         if (argc > 1) {
1216                 mask = 0;
1217                 for (i = 1; i < argc; i++) {
1218                         ret = stat_item_valid(argv[i]);
1219                         if (ret < 0)
1220                                 return ret;
1221                         mask |= (1 << ret);
1222                 }
1223         }
1224         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1225         if (mask & (1 << SI_PLAY_TIME)) {
1226                 struct timeval *t = wstime();
1227                 char *ts = get_time_string(t);
1228                 if (ts) {
1229                         ret = client_write(fd, ts);
1230                         if (ret < 0)
1231                                 goto out;
1232                         free(ts);
1233                 }
1234         }
1235         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1236                 char *tmp, *us = uptime_str();
1237                 tmp = make_message("%s:%s\n",
1238                         status_item_list[SI_AUDIOD_UPTIME], us);
1239                 free(us);
1240                 ret = client_write(fd, tmp);
1241                 if (ret < 0)
1242                         goto out;
1243                 free(tmp);
1244         }
1245         if (mask & (1 << SI_AUDIOD_STATUS)) {
1246                 char *s = audiod_status_string();
1247                 ret = client_write(fd, s);
1248                 if (ret < 0)
1249                         goto out;
1250                 free(s);
1251         }
1252         if (mask & (1 << SI_DECODER_FLAGS)) {
1253                 char *df =decoder_flags();
1254                 ret = client_write(fd, df);
1255                 if (ret < 0)
1256                         goto out;
1257                 free(df);
1258         }
1259
1260         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1261                 char *tmp, *v;
1262                 if (!((1 << i) & mask))
1263                         continue;
1264                 v = stat_item_values[i];
1265                 tmp = make_message("%s%s%s", buf? buf: "",
1266                         v? v : "", v? "\n" : "");
1267                 free(buf);
1268                 buf = tmp;
1269         }
1270         ret = client_write(fd, buf);
1271 out:
1272         if (ret > 0)
1273                 ret = stat_client_add(fd, mask);
1274         free(buf);
1275         return ret;
1276 }
1277
1278 static int com_grab(int fd, char *cmdline)
1279 {
1280         struct grab_client *gc;
1281         struct filter_node *fn;
1282         int i, err;
1283         char *msg;
1284
1285         gc = grab_client_new(fd, cmdline, &err);
1286         if (!gc)
1287                 goto err_out;
1288         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1289         if (fn)
1290                 activate_grab_client(gc, fn);
1291         return 1;
1292 err_out:
1293         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1294                 return err;
1295         if (err == -E_GC_HELP_GIVEN) {
1296                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1297                 for (i = 0; grab_client_args_info_help[i]; i++) {
1298                         char *tmp = make_message("%s%s\n", msg,
1299                                 grab_client_args_info_help[i]);
1300                         free(msg);
1301                         msg = tmp;
1302                 }
1303         } else
1304                 msg = make_message("%s %s\n",
1305                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1306                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1307         err = client_write(fd, msg);
1308         free(msg);
1309         if (err < 0)
1310                 return err;
1311         close(fd);
1312         return 1;
1313 }
1314
1315 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1316 {
1317         close(fd);
1318         clean_exit(EXIT_SUCCESS, "terminating on user request");
1319 }
1320
1321 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1322 {
1323         audiod_status = AUDIOD_ON;
1324         close(fd);
1325         return 1;
1326 }
1327
1328 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1329 {
1330         audiod_status = AUDIOD_OFF;
1331         close(fd);
1332         return 1;
1333 }
1334
1335 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1336 {
1337         audiod_status = AUDIOD_STANDBY;
1338         close(fd);
1339         return 1;
1340 }
1341
1342 static int com_cycle(int fd, int argc, char **argv)
1343 {
1344         switch (audiod_status) {
1345                 case  AUDIOD_ON:
1346                         return com_sb(fd, argc, argv);
1347                         break;
1348                 case  AUDIOD_OFF:
1349                         return com_on(fd, argc, argv);
1350                         break;
1351                 case  AUDIOD_STANDBY:
1352                         return com_off(fd, argc, argv);
1353                         break;
1354         }
1355         close(fd);
1356         return 1;
1357 }
1358
1359 static int check_perms(uid_t uid)
1360 {
1361         int i;
1362
1363         if (!conf.user_allow_given)
1364                 return 1;
1365         for (i = 0; i < conf.user_allow_given; i++)
1366                 if (uid == conf.user_allow_arg[i])
1367                         return 1;
1368         return -E_UCRED_PERM;
1369 }
1370
1371 static int handle_connect(void)
1372 {
1373         int i, argc, ret, clifd = -1;
1374         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1375         struct sockaddr_un unix_addr;
1376
1377         ret = para_accept(cmd_task->fd, &unix_addr, sizeof(struct sockaddr_un));
1378         if (ret < 0)
1379                 goto out;
1380         clifd = ret;
1381         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1382         if (ret < 0)
1383                 goto out;
1384         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1385         ret = check_perms(ret);
1386         if (ret < 0)
1387                 goto out;
1388         ret = -E_INVALID_AUDIOD_CMD;
1389         cmd = para_strdup(buf);
1390         p = strchr(cmd, '\n');
1391         if (!p)
1392                 p = "";
1393         else {
1394                 *p = '\0';
1395                 p++;
1396         }
1397         for (i = 0; cmds[i].name; i++) {
1398                 int j;
1399                 if (strcmp(cmds[i].name, cmd))
1400                         continue;
1401                 if (cmds[i].handler) {
1402                         argc = split_args(buf, &argv, "\n");
1403                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1404                         ret = cmds[i].handler(clifd, argc, argv);
1405                         goto out;
1406                 }
1407                 for (j = 0; p[j]; j++)
1408                         if (p[j] == '\n')
1409                                 p[j] = ' ';
1410                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1411                 ret = cmds[i].line_handler(clifd, p);
1412                 goto out;
1413         }
1414         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1415 out:
1416         free(cmd);
1417         free(buf);
1418         free(argv);
1419         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1420                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1421                 client_write(clifd, tmp);
1422                 free(tmp);
1423                 close(clifd);
1424         }
1425         return ret;
1426 }
1427
1428 static void audiod_get_socket(void)
1429 {
1430         struct sockaddr_un unix_addr;
1431
1432         if (conf.socket_given)
1433                 socket_name = para_strdup(conf.socket_arg);
1434         else {
1435                 char *hn = para_hostname();
1436                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1437                         hn);
1438                 free(hn);
1439         }
1440         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1441         if (conf.force_given)
1442                 unlink(socket_name);
1443         cmd_task->fd = create_pf_socket(socket_name, &unix_addr,
1444                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1445         if (cmd_task->fd < 0) {
1446                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1447                 exit(EXIT_FAILURE); /* do not unlink socket */
1448         }
1449         if (listen(cmd_task->fd , 5) < 0) {
1450                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1451                 exit(EXIT_FAILURE); /* do not unlink socket */
1452         }
1453         add_close_on_fork_list(cmd_task->fd);
1454 }
1455
1456 static int open_stat_pipe(void)
1457 {
1458         int ret, fd[3] = {-1, 1, 0};
1459         pid_t pid;
1460         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1461         if (ret >= 0) {
1462                 ret = fd[1];
1463                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1464                 add_close_on_fork_list(ret);
1465         } else
1466                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1467         return ret;
1468 }
1469
1470 void signal_event_handler(struct task *t)
1471 {
1472         struct signal_task *st = t->private_data;
1473         handle_signal(st->signum);
1474 }
1475
1476 void signal_pre_select(struct sched *s, struct task *t)
1477 {
1478         struct signal_task *st = t->private_data;
1479         t->ret = 1;
1480         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1481 }
1482
1483 void signal_post_select(struct sched *s, struct task *t)
1484 {
1485         struct signal_task *st = t->private_data;
1486         t->ret = 1;
1487         if (!FD_ISSET(st->fd, &s->rfds))
1488                 return;
1489         t->ret = -E_SIGNAL_CAUGHT;
1490         st->signum = para_next_signal();
1491 }
1492
1493 void signal_setup_default(struct signal_task *st)
1494 {
1495         st->task.pre_select = signal_pre_select;
1496         st->task.post_select = signal_post_select;
1497         st->task.private_data = st;
1498         st->task.flags = 0;
1499         sprintf(st->task.status, "signal task");
1500 }
1501
1502 static void command_pre_select(struct sched *s, struct task *t)
1503 {
1504         struct command_task *ct = t->private_data;
1505         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1506
1507 }
1508
1509 static void command_post_select(struct sched *s, struct task *t)
1510 {
1511         int ret;
1512         struct command_task *ct = t->private_data;
1513
1514         if (audiod_status != AUDIOD_OFF)
1515                 audiod_status_dump();
1516         t->ret = 1; /* always successful */
1517         if (!FD_ISSET(ct->fd, &s->rfds))
1518                 return;
1519         ret = handle_connect();
1520         if (ret < 0)
1521                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1522 }
1523
1524 static void init_command_task(struct command_task *ct)
1525 {
1526         ct->task.pre_select = command_pre_select;
1527         ct->task.post_select = command_post_select;
1528         ct->task.private_data = ct;
1529         ct->task.flags = 0;
1530         sprintf(ct->task.status, "command task");
1531 }
1532
1533 static void status_pre_select(struct sched *s, struct task *t)
1534 {
1535         struct status_task *st = t->private_data;
1536         t->ret = 1;
1537         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1538                 close_stat_pipe();
1539         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1540                 st->fd = open_stat_pipe();
1541                 st->loaded = 0;
1542                 st->buf[0] = '\0';
1543         }
1544         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1545                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1546 }
1547
1548 static void status_post_select(struct sched *s, struct task *t)
1549 {
1550         struct status_task *st = t->private_data;
1551         int ret;
1552
1553         t->ret = 1;
1554         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1555                 return;
1556         ret = read(st->fd, st->buf + st->loaded,
1557                 STRINGSIZE - 1 - st->loaded);
1558         if (ret <= 0) {
1559                 close_stat_pipe();
1560                 /* avoid busy loop if server is down */
1561                 while (sleep(1) > 0) /* FIXME */
1562                         ; /* try again*/
1563         } else {
1564                 st->buf[ret + st->loaded] = '\0';
1565                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1566                         &check_stat_line);
1567         }
1568 }
1569
1570 static void init_status_task(struct status_task *st)
1571 {
1572         st->task.pre_select = status_pre_select;
1573         st->task.post_select = status_post_select;
1574         st->task.private_data = st;
1575         st->task.flags = 0;
1576         st->loaded = 0;
1577         st->fd = -1;
1578         st->buf[0] = '\0';
1579         sprintf(st->task.status, "status task");
1580 }
1581
1582 static void set_initial_status(void)
1583 {
1584         audiod_status = AUDIOD_ON;
1585         if (!conf.mode_given)
1586                 return;
1587         if (!strcmp(conf.mode_arg, "sb")) {
1588                 audiod_status = AUDIOD_STANDBY;
1589                 return;
1590         }
1591         if (!strcmp(conf.mode_arg, "off")) {
1592                 audiod_status = AUDIOD_OFF;
1593                 return;
1594         }
1595         if (strcmp(conf.mode_arg, "on"))
1596                 PARA_WARNING_LOG("%s", "invalid mode\n");
1597 }
1598
1599 int main(int argc, char *argv[])
1600 {
1601         char *cf;
1602         int ret, i;
1603         struct sched s;
1604
1605         init_sched();
1606
1607         valid_fd_012();
1608         hostname = para_hostname();
1609         cmdline_parser(argc, argv, &conf);
1610         para_drop_privileges(conf.user_arg, conf.group_arg);
1611         cf = configfile_exists();
1612         if (cf) {
1613                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1614                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1615                         exit(EXIT_FAILURE);
1616                 }
1617         }
1618         if (conf.logfile_given)
1619                 logfile = open_log(conf.logfile_arg);
1620         log_welcome("para_audiod", conf.loglevel_arg);
1621         i = init_stream_io();
1622         if (i < 0) {
1623                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1624                 exit(EXIT_FAILURE);
1625         }
1626         server_uptime(UPTIME_SET);
1627         set_initial_status();
1628         FOR_EACH_SLOT(i)
1629                 clear_slot(i);
1630         init_grabbing();
1631         setup_signal_handling();
1632         if (conf.daemon_given)
1633                 daemon_init();
1634         audiod_get_socket(); /* doesn't return on errors */
1635
1636         signal_setup_default(sig_task);
1637         sig_task->task.event_handler = signal_event_handler;
1638
1639         init_status_task(stat_task);
1640         init_command_task(cmd_task);
1641         init_audiod_task(at);
1642
1643         register_task(&sig_task->task);
1644         register_task(&cmd_task->task);
1645         register_task(&stat_task->task);
1646         register_task(&at->task);
1647         s.default_timeout.tv_sec = 0;
1648         s.default_timeout.tv_usec = 99 * 1000;
1649         ret = sched(&s);
1650
1651         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1652         return EXIT_FAILURE;
1653 }