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         struct writer_node_group *g = t->private_data;
 658         int i;
 659
 660         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 661         unregister_task(t);
 662         FOR_EACH_SLOT(i) {
 663                 if (slot[i].wng != g)
 664                         continue;
 665                 wng_close(g);
 666                 wng_destroy(g);
 667                 slot[i].wng = NULL;
 668         }
 669 }
 670
 671 static void open_writer(int slot_num)
 672 {
 673         int ret, i;
 674         struct slot_info *s = &slot[slot_num];
 675         struct audio_format_info *a = &afi[s->format];
 676
 677         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 678         if (!a->num_writers)
 679                 s->wng = setup_default_wng();
 680         else
 681                 s->wng = wng_new(a->num_writers);
 682         if (s->fc) {
 683                 s->wng->buf = s->fc->outbuf;
 684                 s->wng->loaded = s->fc->out_loaded;
 685                 s->wng->input_eof = &s->fc->eof;
 686                 s->fc->output_eof = &s->wng->eof;
 687         } else {
 688                 s->wng->buf = s->receiver_node->buf;
 689                 s->wng->loaded = &s->receiver_node->loaded;
 690                 s->wng->input_eof = &s->receiver_node->eof;
 691         }
 692         s->wng->task.event_handler = wng_event_handler;
 693         for (i = 0; i < a->num_writers; i++) {
 694                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 695                 s->wng->writer_nodes[i].writer = a->writers[i];
 696                 sprintf(s->wng->writer_nodes[i].task.status, "writer_node");
 697         }
 698         ret = wng_open(s->wng);
 699         s->wstime = *now;
 700         current_decoder = slot_num;
 701         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 702 }
 703
 704 static void rn_event_handler(struct task *t)
 705 {
 706 //      struct receiver_node *rn = t->private_data;
 707         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 708         unregister_task(t);
 709 }
 710
 711 static void open_receiver(int format)
 712 {
 713         struct audio_format_info *a = &afi[format];
 714         struct slot_info *s;
 715         int ret, slot_num;
 716         struct receiver_node *rn;
 717
 718         slot_num = get_empty_slot();
 719         if (slot_num < 0)
 720                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 721         s = &slot[slot_num];
 722         s->format = format;
 723         s->rtime = *now;
 724         s->wtime = s->rtime;
 725         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 726         rn = s->receiver_node;
 727         rn->receiver = a->receiver;
 728         rn->conf = a->receiver_conf;
 729         ret = a->receiver->open(s->receiver_node);
 730         if (ret < 0) {
 731                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 732                         PARA_STRERROR(-ret));
 733                 free(s->receiver_node);
 734                 s->receiver_node = NULL;
 735                 return;
 736         }
 737         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 738                 audio_formats[s->format], a->receiver->name, slot_num);
 739         rn->task.private_data = s->receiver_node;
 740         rn->task.pre_select = a->receiver->pre_select;
 741         rn->task.post_select = a->receiver->post_select;
 742         rn->task.event_handler = rn_event_handler;
 743         rn->task.flags = 0;
 744         sprintf(rn->task.status, "receiver node");
 745         register_task(&rn->task);
 746 }
 747
 748 static int is_frozen(int format)
 749 {
 750         struct audio_format_info *a = &afi[format];
 751
 752         return (tv_diff(now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 753 }
 754
 755 static void open_current_receiver(void)
 756 {
 757         int i;
 758
 759         if (!af_status)
 760                 return;
 761         i = get_audio_format_num(af_status);
 762         if (i < 0)
 763                 return;
 764         if (decoder_running(i) || is_frozen(i))
 765                 return;
 766         open_receiver(i);
 767 }
 768
 769 static void compute_time_diff(const struct timeval *status_time)
 770 {
 771         struct timeval tmp, diff;
 772         static int count;
 773         int sign;
 774         const struct timeval max_deviation = {0, 500 * 1000};
 775         const int time_smooth = 5;
 776
 777         sign = tv_diff(status_time, now, &diff);
 778 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 779 //                      sign, sa_time_diff_sign);
 780         if (!count) {
 781                 sa_time_diff_sign = sign;
 782                 sa_time_diff = diff;
 783                 count++;
 784                 return;
 785         }
 786         if (count > 5) {
 787                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 788                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 789                         PARA_WARNING_LOG("time diff jump: %lims\n",
 790                                 s * tv2ms(&tmp));
 791         }
 792         count++;
 793         sa_time_diff_sign = tv_convex_combination(
 794                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 795                 count > 10? sign : sign * time_smooth, &diff,
 796                 &tmp);
 797         sa_time_diff = tmp;
 798         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 799                 sign > 0? "+" : "-",
 800                 tv2ms(&diff),
 801                 sa_time_diff_sign ? "+" : "-",
 802                 tv2ms(&sa_time_diff)
 803         );
 804 }
 805
 806 static void check_stat_line(char *line)
 807 {
 808         int itemnum;
 809         size_t ilen = 0;
 810         long unsigned sec, usec;
 811         char *tmp;
 812
 813 //      PARA_INFO_LOG("line: %s\n", line);
 814         if (!line)
 815                 return;
 816         itemnum = stat_line_valid(line);
 817         if (itemnum < 0) {
 818                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 819                 return;
 820         }
 821         tmp = make_message("%s\n", line);
 822         stat_client_write(tmp, itemnum);
 823         free(tmp);
 824         free(stat_item_values[itemnum]);
 825         stat_item_values[itemnum] = para_strdup(line);
 826         ilen = strlen(status_item_list[itemnum]);
 827         switch (itemnum) {
 828         case SI_STATUS:
 829                 playing = strstr(line, "playing")? 1 : 0;
 830                 break;
 831         case SI_FORMAT:
 832                 free(af_status);
 833                 af_status = para_strdup(line + ilen + 1);
 834                 break;
 835         case SI_OFFSET:
 836                 offset_seconds = atoi(line + ilen + 1);
 837                 break;
 838         case SI_LENGTH:
 839                 length_seconds = atoi(line + ilen + 1);
 840                 break;
 841         case SI_STREAM_START:
 842                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 843                         server_stream_start.tv_sec = sec;
 844                         server_stream_start.tv_usec = usec;
 845                 }
 846                 break;
 847         case SI_CURRENT_TIME:
 848                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 849                         struct timeval tv = {sec, usec};
 850                         compute_time_diff(&tv);
 851                 }
 852                 break;
 853         }
 854 }
 855
 856 static void handle_signal(int sig)
 857 {
 858         switch (sig) {
 859         case SIGCHLD:
 860                 for (;;) {
 861                         pid_t pid = para_reap_child();
 862                         if (pid <= 0)
 863                                 return;
 864                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 865                 }
 866         case SIGINT:
 867         case SIGTERM:
 868         case SIGHUP:
 869                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 870                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 871                 return;
 872         }
 873 }
 874
 875 static void check_timeouts(void)
 876 {
 877
 878         int slot_num, timeout = conf.stream_timeout_arg;
 879
 880         FOR_EACH_SLOT(slot_num) {
 881                 struct slot_info *s = &slot[slot_num];
 882                 if (s->format < 0)
 883                         continue;
 884                 /* check read time */
 885                 if (s->receiver_node &&
 886                         now->tv_sec > s->rtime.tv_sec + timeout) {
 887                         PARA_INFO_LOG("%s stream (slot %d) not ready\n",
 888                                 audio_formats[s->format], slot_num);
 889                         s->receiver_node->eof = 1;
 890                 }
 891         }
 892 }
 893
 894 static void close_decoder_if_idle(int slot_num)
 895 {
 896         struct slot_info *s = &slot[slot_num];
 897
 898         if (s->format < 0)
 899                 return;
 900         if (!s->fc)
 901                 return;
 902         if (s->wng)
 903                 return;
 904         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 905                 slot_num, s->fc);
 906         close_filters(s->fc);
 907         free(s->fc);
 908         close_receiver(slot_num);
 909         clear_slot(slot_num);
 910 }
 911
 912 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 913 {
 914         int i;
 915
 916         now = &s->now;
 917         if (audiod_status != AUDIOD_ON)
 918                 kill_all_decoders();
 919         else if (playing)
 920                 open_current_receiver();
 921         check_timeouts();
 922         FOR_EACH_SLOT(i) {
 923                 struct receiver_node *rn;
 924
 925                 close_decoder_if_idle(i);
 926                 if (slot[i].format < 0)
 927                         continue;
 928                 rn = slot[i].receiver_node;
 929                 if (rn && rn->loaded && !slot[i].wng) {
 930                         open_filters(i);
 931                         open_writer(i);
 932                 }
 933         }
 934 }
 935
 936 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 937 {
 938         int i;
 939
 940         now = &s->now;
 941         FOR_EACH_SLOT(i) {
 942                 struct receiver_node *rn = slot[i].receiver_node;
 943
 944                 if (rn && rn->loaded)
 945                         slot[i].rtime = *now;
 946         }
 947 }
 948
 949 static void init_audiod_task(struct audiod_task *at)
 950 {
 951         at->task.pre_select = audiod_pre_select;
 952         at->task.post_select = audiod_post_select;
 953         at->task.private_data = at;
 954         at->task.flags = 0;
 955         sprintf(at->task.status, "audiod task");
 956 }
 957
 958 static int parse_stream_command(const char *txt, char **cmd)
 959 {
 960         char *p = strchr(txt, ':');
 961         int i;
 962
 963         if (!p)
 964                 return -E_MISSING_COLON;
 965         p++;
 966         FOR_EACH_AUDIO_FORMAT(i) {
 967                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 968                         continue;
 969                 *cmd = p;
 970                 return i;
 971         }
 972         return -E_UNSUPPORTED_AUDIO_FORMAT;
 973 }
 974
 975 static int add_filter(int format, char *cmdline)
 976 {
 977         struct audio_format_info *a = &afi[format];
 978         int filter_num, nf = a->num_filters;
 979
 980         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 981         if (filter_num < 0)
 982                 return filter_num;
 983         a->filters[nf] = &filters[filter_num];
 984         a->num_filters++;
 985         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 986                 a->filters[nf]->name);
 987         return filter_num;
 988 }
 989
 990 static int init_writers(void)
 991 {
 992         int i, ret, nw;
 993         char *cmd;
 994         struct audio_format_info *a;
 995
 996         init_supported_writers();
 997         nw = PARA_MAX(1, conf.writer_given);
 998         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 999         FOR_EACH_AUDIO_FORMAT(i) {
1000                 a = &afi[i];
1001                 a->writer_conf = para_malloc(nw * sizeof(void *));
1002                 a->writers = para_malloc(nw * sizeof(struct writer *));
1003                 a->num_writers = 0;
1004         }
1005         for (i = 0; i < conf.writer_given; i++) {
1006                 void *wconf;
1007                 int writer_num;
1008                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1009                 if (ret < 0)
1010                         goto out;
1011                 a = &afi[ret];
1012                 nw = a->num_writers;
1013                 wconf = check_writer_arg(cmd, &writer_num);
1014                 if (!wconf) {
1015                         ret = writer_num;
1016                         goto out;
1017                 }
1018                 a->writers[nw] = &writers[writer_num];
1019                 a->writer_conf[nw] = wconf;
1020                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1021                         nw, writer_names[writer_num]);
1022                 a->num_writers++;
1023         }
1024         ret = 1;
1025 out:
1026         return ret;
1027 }
1028
1029 static int init_receivers(void)
1030 {
1031         int i, ret, receiver_num;
1032         char *cmd = NULL;
1033         struct audio_format_info *a;
1034
1035         for (i = 0; receivers[i].name; i++) {
1036                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1037                 receivers[i].init(&receivers[i]);
1038         }
1039         for (i = 0; i < conf.receiver_given; i++) {
1040                 char *arg = conf.receiver_arg[i];
1041                 char *recv = strchr(arg, ':');
1042                 ret = -E_MISSING_COLON;
1043                 if (!recv)
1044                         goto out;
1045                 *recv = '\0';
1046                 recv++;
1047                 ret = get_audio_format_num(arg);
1048                 if (ret < 0)
1049                         goto out;
1050                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1051                 if (!afi[ret].receiver_conf) {
1052                         ret = -E_RECV_SYNTAX;
1053                         goto out;
1054                 }
1055                 afi[ret].receiver = &receivers[receiver_num];
1056         }
1057         /* use the first available receiver with no arguments
1058          * for those audio formats for which no receiver
1059          * was specified
1060          */
1061         cmd = para_strdup(receivers[0].name);
1062         FOR_EACH_AUDIO_FORMAT(i) {
1063                 a = &afi[i];
1064                 if (a->receiver_conf)
1065                         continue;
1066                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1067                 if (!a->receiver_conf)
1068                         return -E_RECV_SYNTAX;
1069                 a->receiver = &receivers[receiver_num];
1070         }
1071         ret = 1;
1072 out:
1073         free(cmd);
1074         return ret;
1075 }
1076
1077 static int init_default_filters(void)
1078 {
1079         int i, ret = 1;
1080
1081         FOR_EACH_AUDIO_FORMAT(i) {
1082                 struct audio_format_info *a = &afi[i];
1083                 char *tmp;
1084                 int j;
1085
1086                 if (a->num_filters)
1087                         continue; /* no default -- nothing to to */
1088                 /* add "dec" to audio format name */
1089                 tmp = make_message("%sdec", audio_formats[i]);
1090                 for (j = 0; filters[j].name; j++)
1091                         if (!strcmp(tmp, filters[j].name))
1092                                 break;
1093                 free(tmp);
1094                 ret = -E_UNSUPPORTED_FILTER;
1095                 if (!filters[j].name)
1096                         goto out;
1097                 tmp = para_strdup(filters[j].name);
1098                 ret = add_filter(i, tmp);
1099                 free(tmp);
1100                 if (ret < 0)
1101                         goto out;
1102                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1103                         filters[j].name);
1104         }
1105 out:
1106         return ret;
1107 }
1108
1109 static int init_filters(void)
1110 {
1111         int i, ret, nf;
1112
1113         filter_init(filters);
1114         nf = PARA_MAX(1,  conf.filter_given);
1115         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
1116         FOR_EACH_AUDIO_FORMAT(i) {
1117                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1118                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1119         }
1120         if (!conf.no_default_filters_given)
1121                 return init_default_filters();
1122         for (i = 0; i < conf.filter_given; i++) {
1123                 char *arg = conf.filter_arg[i];
1124                 char *filter_name = strchr(arg, ':');
1125                 ret = -E_MISSING_COLON;
1126                 if (!filter_name)
1127                         goto out;
1128                 *filter_name = '\0';
1129                 filter_name++;
1130                 ret = get_audio_format_num(arg);
1131                 if (ret < 0)
1132                         goto out;
1133                 ret = add_filter(ret, filter_name);
1134                 if (ret < 0)
1135                         goto out;
1136         }
1137         ret = init_default_filters(); /* use default values for the rest */
1138 out:
1139         return ret;
1140 }
1141
1142 static int init_stream_io(void)
1143 {
1144         int ret;
1145
1146         ret = init_writers();
1147         if (ret < 0)
1148                 return ret;
1149         ret = init_receivers();
1150         if (ret < 0)
1151                 return ret;
1152         ret = init_filters();
1153         if (ret < 0)
1154                 return ret;
1155         return 1;
1156 }
1157
1158 static int dump_commands(int fd)
1159 {
1160         char *buf = para_strdup(""), *tmp = NULL;
1161         int i;
1162         ssize_t ret;
1163
1164         FOR_EACH_COMMAND(i) {
1165                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1166                         cmds[i].description);
1167                 free(buf);
1168                 buf = tmp;
1169         }
1170         ret = client_write(fd, buf);
1171         free(buf);
1172         return ret;
1173 }
1174
1175 /*
1176  * command handlers don't close their fd on errors (ret < 0) so that
1177  * its caller can send an error message. Otherwise (ret >= 0) it's up
1178  * to each individual command to close the fd if necessary.
1179  */
1180
1181 static int com_help(int fd, int argc, char **argv)
1182 {
1183         int i, ret;
1184         char *buf;
1185         const char *dflt = "No such command. Available commands:\n";
1186
1187         if (argc < 2) {
1188                 ret = dump_commands(fd);
1189                 goto out;
1190         }
1191         FOR_EACH_COMMAND(i) {
1192                 if (strcmp(cmds[i].name, argv[1]))
1193                         continue;
1194                 buf = make_message(
1195                         "NAME\n\t%s -- %s\n"
1196                         "SYNOPSIS\n\tpara_audioc %s\n"
1197                         "DESCRIPTION\n%s\n",
1198                         argv[1],
1199                         cmds[i].description,
1200                         cmds[i].synopsis,
1201                         cmds[i].help
1202                 );
1203                 ret = client_write(fd, buf);
1204                 free(buf);
1205                 goto out;
1206         }
1207         ret = client_write(fd, dflt);
1208         if (ret > 0)
1209                 ret = dump_commands(fd);
1210 out:
1211         if (ret >= 0)
1212                 close(fd);
1213         return ret;
1214 }
1215
1216 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1217 {
1218         int i, ret;
1219         char *buf = NULL;
1220         long unsigned mask = ~0LU;
1221
1222         if (argc > 1) {
1223                 mask = 0;
1224                 for (i = 1; i < argc; i++) {
1225                         ret = stat_item_valid(argv[i]);
1226                         if (ret < 0)
1227                                 return ret;
1228                         mask |= (1 << ret);
1229                 }
1230         }
1231         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1232         if (mask & (1 << SI_PLAY_TIME)) {
1233                 struct timeval *t = wstime();
1234                 char *ts = get_time_string(t);
1235                 if (ts) {
1236                         ret = client_write(fd, ts);
1237                         if (ret < 0)
1238                                 goto out;
1239                         free(ts);
1240                 }
1241         }
1242         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1243                 char *tmp, *us = uptime_str();
1244                 tmp = make_message("%s:%s\n",
1245                         status_item_list[SI_AUDIOD_UPTIME], us);
1246                 free(us);
1247                 ret = client_write(fd, tmp);
1248                 if (ret < 0)
1249                         goto out;
1250                 free(tmp);
1251         }
1252         if (mask & (1 << SI_AUDIOD_STATUS)) {
1253                 char *s = audiod_status_string();
1254                 ret = client_write(fd, s);
1255                 if (ret < 0)
1256                         goto out;
1257                 free(s);
1258         }
1259         if (mask & (1 << SI_DECODER_FLAGS)) {
1260                 char *df =decoder_flags();
1261                 ret = client_write(fd, df);
1262                 if (ret < 0)
1263                         goto out;
1264                 free(df);
1265         }
1266
1267         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1268                 char *tmp, *v;
1269                 if (!((1 << i) & mask))
1270                         continue;
1271                 v = stat_item_values[i];
1272                 tmp = make_message("%s%s%s", buf? buf: "",
1273                         v? v : "", v? "\n" : "");
1274                 free(buf);
1275                 buf = tmp;
1276         }
1277         ret = client_write(fd, buf);
1278 out:
1279         if (ret > 0)
1280                 ret = stat_client_add(fd, mask);
1281         free(buf);
1282         return ret;
1283 }
1284
1285 static int com_grab(int fd, char *cmdline)
1286 {
1287         struct grab_client *gc;
1288         struct filter_node *fn;
1289         int i, err;
1290         char *msg;
1291
1292         gc = grab_client_new(fd, cmdline, &err);
1293         if (!gc)
1294                 goto err_out;
1295         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1296         if (fn)
1297                 activate_grab_client(gc, fn);
1298         return 1;
1299 err_out:
1300         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1301                 return err;
1302         if (err == -E_GC_HELP_GIVEN) {
1303                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1304                 for (i = 0; grab_client_args_info_help[i]; i++) {
1305                         char *tmp = make_message("%s%s\n", msg,
1306                                 grab_client_args_info_help[i]);
1307                         free(msg);
1308                         msg = tmp;
1309                 }
1310         } else
1311                 msg = make_message("%s %s\n",
1312                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1313                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1314         err = client_write(fd, msg);
1315         free(msg);
1316         if (err < 0)
1317                 return err;
1318         close(fd);
1319         return 1;
1320 }
1321
1322 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1323 {
1324         close(fd);
1325         clean_exit(EXIT_SUCCESS, "terminating on user request");
1326 }
1327
1328 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1329 {
1330         audiod_status = AUDIOD_ON;
1331         close(fd);
1332         return 1;
1333 }
1334
1335 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1336 {
1337         audiod_status = AUDIOD_OFF;
1338         close(fd);
1339         return 1;
1340 }
1341
1342 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1343 {
1344         audiod_status = AUDIOD_STANDBY;
1345         close(fd);
1346         return 1;
1347 }
1348
1349 static int com_cycle(int fd, int argc, char **argv)
1350 {
1351         switch (audiod_status) {
1352                 case  AUDIOD_ON:
1353                         return com_sb(fd, argc, argv);
1354                         break;
1355                 case  AUDIOD_OFF:
1356                         return com_on(fd, argc, argv);
1357                         break;
1358                 case  AUDIOD_STANDBY:
1359                         return com_off(fd, argc, argv);
1360                         break;
1361         }
1362         close(fd);
1363         return 1;
1364 }
1365
1366 static int check_perms(uid_t uid)
1367 {
1368         int i;
1369
1370         if (!conf.user_allow_given)
1371                 return 1;
1372         for (i = 0; i < conf.user_allow_given; i++)
1373                 if (uid == conf.user_allow_arg[i])
1374                         return 1;
1375         return -E_UCRED_PERM;
1376 }
1377
1378 static int handle_connect(void)
1379 {
1380         int i, argc, ret, clifd = -1;
1381         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1382         struct sockaddr_un unix_addr;
1383
1384         ret = para_accept(cmd_task->fd, &unix_addr, sizeof(struct sockaddr_un));
1385         if (ret < 0)
1386                 goto out;
1387         clifd = ret;
1388         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1389         if (ret < 0)
1390                 goto out;
1391         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1392         ret = check_perms(ret);
1393         if (ret < 0)
1394                 goto out;
1395         ret = -E_INVALID_AUDIOD_CMD;
1396         cmd = para_strdup(buf);
1397         p = strchr(cmd, '\n');
1398         if (!p)
1399                 p = "";
1400         else {
1401                 *p = '\0';
1402                 p++;
1403         }
1404         for (i = 0; cmds[i].name; i++) {
1405                 int j;
1406                 if (strcmp(cmds[i].name, cmd))
1407                         continue;
1408                 if (cmds[i].handler) {
1409                         argc = split_args(buf, &argv, "\n");
1410                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1411                         ret = cmds[i].handler(clifd, argc, argv);
1412                         goto out;
1413                 }
1414                 for (j = 0; p[j]; j++)
1415                         if (p[j] == '\n')
1416                                 p[j] = ' ';
1417                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1418                 ret = cmds[i].line_handler(clifd, p);
1419                 goto out;
1420         }
1421         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1422 out:
1423         free(cmd);
1424         free(buf);
1425         free(argv);
1426         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1427                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1428                 client_write(clifd, tmp);
1429                 free(tmp);
1430                 close(clifd);
1431         }
1432         return ret;
1433 }
1434
1435 static void audiod_get_socket(void)
1436 {
1437         struct sockaddr_un unix_addr;
1438
1439         if (conf.socket_given)
1440                 socket_name = para_strdup(conf.socket_arg);
1441         else {
1442                 char *hn = para_hostname();
1443                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1444                         hn);
1445                 free(hn);
1446         }
1447         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1448         if (conf.force_given)
1449                 unlink(socket_name);
1450         cmd_task->fd = create_pf_socket(socket_name, &unix_addr,
1451                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1452         if (cmd_task->fd < 0) {
1453                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1454                 exit(EXIT_FAILURE); /* do not unlink socket */
1455         }
1456         if (listen(cmd_task->fd , 5) < 0) {
1457                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1458                 exit(EXIT_FAILURE); /* do not unlink socket */
1459         }
1460         add_close_on_fork_list(cmd_task->fd);
1461 }
1462
1463 static int open_stat_pipe(void)
1464 {
1465         int ret, fd[3] = {-1, 1, 0};
1466         pid_t pid;
1467         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1468         if (ret >= 0) {
1469                 ret = fd[1];
1470                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1471                 add_close_on_fork_list(ret);
1472         } else
1473                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1474         return ret;
1475 }
1476
1477 void signal_event_handler(struct task *t)
1478 {
1479         struct signal_task *st = t->private_data;
1480         handle_signal(st->signum);
1481 }
1482
1483 void signal_pre_select(struct sched *s, struct task *t)
1484 {
1485         struct signal_task *st = t->private_data;
1486         t->ret = 1;
1487         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1488 }
1489
1490 void signal_post_select(struct sched *s, struct task *t)
1491 {
1492         struct signal_task *st = t->private_data;
1493         t->ret = 1;
1494         if (!FD_ISSET(st->fd, &s->rfds))
1495                 return;
1496         t->ret = -E_SIGNAL_CAUGHT;
1497         st->signum = para_next_signal();
1498 }
1499
1500 void signal_setup_default(struct signal_task *st)
1501 {
1502         st->task.pre_select = signal_pre_select;
1503         st->task.post_select = signal_post_select;
1504         st->task.private_data = st;
1505         st->task.flags = 0;
1506         sprintf(st->task.status, "signal task");
1507 }
1508
1509 static void command_pre_select(struct sched *s, struct task *t)
1510 {
1511         struct command_task *ct = t->private_data;
1512         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1513
1514 }
1515
1516 static void command_post_select(struct sched *s, struct task *t)
1517 {
1518         int ret;
1519         struct command_task *ct = t->private_data;
1520
1521         if (audiod_status != AUDIOD_OFF)
1522                 audiod_status_dump();
1523         t->ret = 1; /* always successful */
1524         if (!FD_ISSET(ct->fd, &s->rfds))
1525                 return;
1526         ret = handle_connect();
1527         if (ret < 0)
1528                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1529 }
1530
1531 static void init_command_task(struct command_task *ct)
1532 {
1533         ct->task.pre_select = command_pre_select;
1534         ct->task.post_select = command_post_select;
1535         ct->task.private_data = ct;
1536         ct->task.flags = 0;
1537         sprintf(ct->task.status, "command task");
1538 }
1539
1540 static void status_pre_select(struct sched *s, struct task *t)
1541 {
1542         struct status_task *st = t->private_data;
1543         t->ret = 1;
1544         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1545                 close_stat_pipe();
1546         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1547                 st->fd = open_stat_pipe();
1548                 st->loaded = 0;
1549                 st->buf[0] = '\0';
1550         }
1551         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1552                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1553 }
1554
1555 static void status_post_select(struct sched *s, struct task *t)
1556 {
1557         struct status_task *st = t->private_data;
1558         int ret;
1559
1560         t->ret = 1;
1561         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1562                 return;
1563         ret = read(st->fd, st->buf + st->loaded,
1564                 STRINGSIZE - 1 - st->loaded);
1565         if (ret <= 0) {
1566                 close_stat_pipe();
1567                 /* avoid busy loop if server is down */
1568                 while (sleep(1) > 0) /* FIXME */
1569                         ; /* try again*/
1570         } else {
1571                 st->buf[ret + st->loaded] = '\0';
1572                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1573                         &check_stat_line);
1574         }
1575 }
1576
1577 static void init_status_task(struct status_task *st)
1578 {
1579         st->task.pre_select = status_pre_select;
1580         st->task.post_select = status_post_select;
1581         st->task.private_data = st;
1582         st->task.flags = 0;
1583         st->loaded = 0;
1584         st->fd = -1;
1585         st->buf[0] = '\0';
1586         sprintf(st->task.status, "status task");
1587 }
1588
1589 static void set_initial_status(void)
1590 {
1591         audiod_status = AUDIOD_ON;
1592         if (!conf.mode_given)
1593                 return;
1594         if (!strcmp(conf.mode_arg, "sb")) {
1595                 audiod_status = AUDIOD_STANDBY;
1596                 return;
1597         }
1598         if (!strcmp(conf.mode_arg, "off")) {
1599                 audiod_status = AUDIOD_OFF;
1600                 return;
1601         }
1602         if (strcmp(conf.mode_arg, "on"))
1603                 PARA_WARNING_LOG("%s", "invalid mode\n");
1604 }
1605
1606 int main(int argc, char *argv[])
1607 {
1608         char *cf;
1609         int ret, i;
1610         struct sched s;
1611
1612         init_sched();
1613
1614         valid_fd_012();
1615         hostname = para_hostname();
1616         cmdline_parser(argc, argv, &conf);
1617         para_drop_privileges(conf.user_arg, conf.group_arg);
1618         cf = configfile_exists();
1619         if (cf) {
1620                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1621                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1622                         exit(EXIT_FAILURE);
1623                 }
1624         }
1625         if (conf.logfile_given)
1626                 logfile = open_log(conf.logfile_arg);
1627         log_welcome("para_audiod", conf.loglevel_arg);
1628         i = init_stream_io();
1629         if (i < 0) {
1630                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1631                 exit(EXIT_FAILURE);
1632         }
1633         server_uptime(UPTIME_SET);
1634         set_initial_status();
1635         FOR_EACH_SLOT(i)
1636                 clear_slot(i);
1637         init_grabbing();
1638         setup_signal_handling();
1639         if (conf.daemon_given)
1640                 daemon_init();
1641         audiod_get_socket(); /* doesn't return on errors */
1642
1643         signal_setup_default(sig_task);
1644         sig_task->task.event_handler = signal_event_handler;
1645
1646         init_status_task(stat_task);
1647         init_command_task(cmd_task);
1648         init_audiod_task(at);
1649
1650         register_task(&sig_task->task);
1651         register_task(&cmd_task->task);
1652         register_task(&stat_task->task);
1653         register_task(&at->task);
1654         s.default_timeout.tv_sec = 0;
1655         s.default_timeout.tv_usec = 99 * 1000;
1656         ret = sched(&s);
1657
1658         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1659         return EXIT_FAILURE;
1660 }