audiod.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file audiod.c the paraslash's audio daemon */
  20
  21 #include <sys/time.h> /* gettimeofday */
  22 #include "para.h"
  23
  24 #include "audiod.cmdline.h"
  25 #include "list.h"
  26 #include "close_on_fork.h"
  27 #include "recv.h"
  28 #include "filter.h"
  29 #include "grab_client.cmdline.h"
  30 #include "grab_client.h"
  31 #include "ringbuffer.h"
  32
  33 #include "error.h"
  34 #include "audiod.h"
  35 #include "net.h"
  36 #include "daemon.h"
  37 #include "string.h"
  38
  39 /** define the array of error lists needed by para_audiod */
  40 INIT_AUDIOD_ERRLISTS;
  41 /** define the array containing all supported audio formats */
  42 DEFINE_AUDIO_FORMAT_ARRAY;
  43
  44 /**
  45  * the possible modes of operation
  46  *
  47  * - off: disconnect from para_server
  48  * - on: receive status information from para_server and play the audio stream
  49  * - sb: only receive status information but not the audio stream
  50 */
  51 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  52
  53 /** defines how to handle one supported audio format */
  54 struct audio_format_info {
  55 /** pointer to the receiver for this audio format */
  56         struct receiver *receiver;
  57 /** the receiver configuration */
  58         void *receiver_conf;
  59 /** the number of filters that should be activated for this audio format */
  60         unsigned int num_filters;
  61 /** pointer to the array of filters to be activated */
  62         struct filter **filters;
  63 /** pointer to the array of filter configurations */
  64         void **filter_conf;
  65 /** output of the last filter is written to stdin of this command */
  66         char *write_cmd;
  67 /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * describes one instance of a receiver-filter-writer chain
  73  *
  74  * \sa receier_node, receiver, filter, filter_node, filter_chain_info
  75   */
  76 struct slot_info {
  77 /** number of the audio format in this slot */
  78         int format;
  79 /** the file descriptor of the writer */
  80         int write_fd;
  81 /** the process id of the writer */
  82         pid_t wpid;
  83 /** time of the last successful read from the receiver */
  84         struct timeval rtime;
  85 /** time the last write to the write fd happend */
  86         struct timeval wtime;
  87 /** writer start time */
  88         struct timeval wstime;
  89 /** did we include \a write_fd in the fdset */
  90         int  wcheck;
  91 /** set to one if we have sent the TERM signal to \a wpid */
  92         int wkilled;
  93 /** the receiver info associated with this slot */
  94         struct receiver_node *receiver_node;
  95 /** the active filter chain */
  96         struct filter_chain_info *fci;
  97 };
  98
  99 static struct slot_info slot[MAX_STREAM_SLOTS];
 100
 101 /** defines one command of para_audiod */
 102 struct audiod_command {
 103 /** the name of the command */
 104 const char *name;
 105 /** pointer to the function that handles the command */
 106 int (*handler)(int, int, char**);
 107 /** one-line description of the command */
 108 const char *description;
 109 /** summary of the command line options */
 110 const char *synopsis;
 111 /** the long help text */
 112 const char *help;
 113 };
 114
 115 extern const char *status_item_list[NUM_STAT_ITEMS];
 116
 117 static int com_grab(int, int, char **);
 118 static int com_cycle(int, int, char **);
 119 static int com_help(int, int, char **);
 120 static int com_off(int, int, char **);
 121 static int com_on(int, int, char **);
 122 static int com_sb(int, int, char **);
 123 static int com_stat(int, int, char **);
 124 static int com_term(int, int, char **);
 125 static int stat_pipe = -1, signal_pipe;
 126
 127 static struct gengetopt_args_info conf;
 128 static struct timeval server_stream_start, sa_time_diff;
 129 static int playing, current_decoder = -1,
 130         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 131         sa_time_diff_sign = 1, audiod_socket = -1;
 132 static char *af_status, /* the audio format announced in server status */
 133         *socket_name, *hostname;
 134 /** how many status items to remember */
 135 #define RINGBUFFER_SIZE 32
 136 static void *stat_item_ringbuf;
 137 static FILE *logfile;
 138 static const struct timeval restart_delay = {0, 300 * 1000};
 139
 140 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 141
 142 static struct audiod_command cmds[] = {
 143 {
 144 .name = "cycle",
 145 .handler = com_cycle,
 146 .description = "switch to next mode",
 147 .synopsis = "cycle",
 148 .help =
 149
 150 "on -> standby -> off -> on\n"
 151
 152 },
 153 {
 154 .name = "grab",
 155 .handler = com_grab,
 156 .description = "grab the audio stream",
 157 .synopsis = "-- grab [grab_options]",
 158 .help =
 159 "grab ('splice') the audio stream at any position in the filter      \n"
 160 "chain and send that data back to the client. \n"
 161 "Available options:\n\n"
 162 GRAB_HELP_TXT
 163 },
 164 {
 165 .name = "help",
 166 .handler = com_help,
 167 .description = "display command list or help for given command",
 168 .synopsis = "help [command]",
 169 .help =
 170
 171 "When I was younger, so much younger than today, I never needed\n"
 172 "anybody's help in any way. But now these days are gone, I'm not so\n"
 173 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 174 "\n"
 175 "                               -- Beatles: Help\n"
 176
 177 },
 178 {
 179 .name = "off",
 180 .handler = com_off,
 181 .description = "deactivate para_audiod",
 182 .synopsis = "off",
 183 .help =
 184
 185 "Close connection to para_server and stop all decoders.\n"
 186
 187 },
 188 {
 189 .name = "on",
 190 .handler = com_on,
 191 .description = "activate para_audiod",
 192 .synopsis = "on",
 193 .help =
 194
 195 "Establish connection to para_server, retrieve para_server's current\n"
 196 "status. If playing, start corresponding decoder. Otherwise stop\n"
 197 "all decoders.\n"
 198
 199 },
 200 {
 201 .name = "sb",
 202 .handler = com_sb,
 203 .description = "enter standby mode",
 204 .synopsis = "sb",
 205 .help =
 206
 207 "Stop all decoders but leave connection to para_server open.\n"
 208
 209 },
 210 {
 211 .name = "stat",
 212 .handler = com_stat,
 213 .description = "print status information",
 214 .synopsis = "stat",
 215 .help =
 216
 217 "Add para_audiod status information to para_server's status information\n"
 218 "and dump everything to stdout.\n"
 219
 220 },
 221 {
 222 .name = "term",
 223 .handler = com_term,
 224 .description = "terminate audiod",
 225 .synopsis = "term",
 226 .help =
 227
 228 "Stop all decoders, shut down connection to para_server and exit.\n"
 229
 230 },
 231 {
 232 .name = NULL,
 233 }
 234 };
 235
 236 /** iterate over all slots */
 237 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
 238 /** iterate over all supported audio formats */
 239 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 240 /** iterate over the array of all audiod commands */
 241 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 242
 243 /**
 244  * get the audio format number
 245  * \param name the name of the audio format
 246  *
 247  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 248  * \a name is not a supported audio format.
 249  */
 250 int get_audio_format_num(char *name)
 251 {
 252         int i;
 253         FOR_EACH_AUDIO_FORMAT(i)
 254                 if (!strcmp(name, audio_formats[i]))
 255                         return i;
 256         return -E_UNSUPPORTED_AUDIO_FORMAT;
 257 }
 258
 259 /*
 260  * log function. first argument is loglevel.
 261  */
 262 void para_log(int ll, const char* fmt,...)
 263 {
 264         va_list argp;
 265         FILE *outfd;
 266         struct tm *tm;
 267         time_t t1;
 268         char str[MAXLINE] = "";
 269
 270         if (ll < conf.loglevel_arg)
 271                 return;
 272         if (!logfile && conf.logfile_given)
 273                 logfile = open_log(conf.logfile_arg);
 274         if (!logfile && conf.daemon_given)
 275                 return;
 276         if (!logfile) {
 277                 if (ll < WARNING)
 278                         outfd = stdout;
 279                 else
 280                         outfd = stderr;
 281         } else
 282                 outfd = logfile;
 283         time(&t1);
 284         tm = localtime(&t1);
 285         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 286         fprintf(outfd, "%s %s ", str, hostname);
 287         if (conf.loglevel_arg <= INFO)
 288                 fprintf(outfd, "%i ", ll);
 289         va_start(argp, fmt);
 290         vfprintf(outfd, fmt, argp);
 291         va_end(argp);
 292 }
 293
 294 static int client_write(int fd, const char *buf)
 295 {
 296         size_t len = strlen(buf);
 297         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 298 }
 299
 300 static char *get_time_string(struct timeval *newest_stime)
 301 {
 302         struct timeval now, diff, adj_stream_start, tmp;
 303         int total = 0, use_server_time = 1;
 304
 305         if (!playing)
 306                 return make_message("%s:", length_seconds?
 307                         "" : status_item_list[SI_PLAY_TIME]);
 308         if (audiod_status == AUDIOD_OFF)
 309                 goto out;
 310         if (sa_time_diff_sign > 0)
 311                 tv_diff(&server_stream_start, &sa_time_diff,
 312                         &adj_stream_start);
 313         else
 314                 tv_add(&server_stream_start, &sa_time_diff,
 315                         &adj_stream_start);
 316         tmp = adj_stream_start;
 317         if (newest_stime && audiod_status == AUDIOD_ON) {
 318                 tv_diff(newest_stime, &adj_stream_start, &diff);
 319                 if (tv2ms(&diff) < 5000) {
 320                         tmp = *newest_stime;
 321                         use_server_time = 0;
 322                 }
 323         }
 324         gettimeofday(&now, NULL);
 325         tv_diff(&now, &tmp, &diff);
 326         total = diff.tv_sec + offset_seconds;
 327         if (total > length_seconds)
 328                 total = length_seconds;
 329         if (total < 0)
 330                 total = 0;
 331 out:
 332         return make_message(
 333                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 334                 status_item_list[SI_PLAY_TIME],
 335                 use_server_time? "~" : "",
 336                 total / 60,
 337                 total % 60,
 338                 (length_seconds - total) / 60,
 339                 (length_seconds - total) % 60,
 340                 length_seconds? (total * 100 + length_seconds / 2) /
 341                         length_seconds : 0,
 342                 length_seconds / 60,
 343                 length_seconds % 60
 344         );
 345 }
 346
 347 static char *audiod_status_string(void)
 348 {
 349         int i;
 350         struct timeval *newest_stime = NULL;
 351         char *ret, *time_string, *uptime_string, *decoder_flags =
 352                 para_malloc((MAX_STREAM_SLOTS + 1) * sizeof(char));
 353
 354         FOR_EACH_SLOT(i) {
 355                 struct slot_info *s = &slot[i];
 356                 char flag = '0';
 357                 if (s->receiver_node)
 358                         flag += 1;
 359                 if (s->wpid > 0)
 360                         flag += 2;
 361                 if (flag != '0')
 362                         flag += s->format * 4;
 363                 decoder_flags[i] = flag;
 364                 if (s->wpid <= 0)
 365                         continue;
 366                 if (newest_stime && tv_diff(&s->wstime, newest_stime, NULL) <= 0)
 367                         continue;
 368                 newest_stime = &s->wstime;
 369         }
 370         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 371         time_string = get_time_string(newest_stime);
 372         uptime_string = uptime_str();
 373         ret = make_message("%s:%s\n%s:%s\n%s:%s\n%s",
 374                 status_item_list[SI_AUDIOD_UPTIME], uptime_string,
 375                 status_item_list[SI_DECODER_FLAGS], decoder_flags,
 376                 status_item_list[SI_AUDIOD_STATUS], audiod_status == AUDIOD_ON?
 377                         "on" : (audiod_status == AUDIOD_OFF? "off": "sb"),
 378                 time_string);
 379         free(uptime_string);
 380         free(decoder_flags);
 381         free(time_string);
 382         return ret;
 383 }
 384
 385 static char *configfile_exists(void)
 386 {
 387         static char *config_file;
 388
 389         if (!config_file) {
 390                 char *home = para_homedir();
 391                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 392                 free(home);
 393         }
 394         return file_exists(config_file)? config_file : NULL;
 395 }
 396
 397 static void setup_signal_handling(void)
 398 {
 399         signal_pipe = para_signal_init();
 400         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 401         para_install_sighandler(SIGINT);
 402         para_install_sighandler(SIGTERM);
 403         para_install_sighandler(SIGCHLD);
 404         para_install_sighandler(SIGHUP);
 405         signal(SIGPIPE, SIG_IGN);
 406 }
 407
 408 static void audiod_status_dump(void)
 409 {
 410         static char *prev_status;
 411         char *tmp = audiod_status_string();
 412
 413         if (!prev_status || strcmp(tmp, prev_status))
 414                 stat_client_write(tmp);
 415         free(prev_status);
 416         prev_status = tmp;
 417 }
 418
 419 static void clear_slot(int slot_num)
 420 {
 421         struct slot_info *s = &slot[slot_num];
 422
 423         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 424         memset(s, 0, sizeof(struct slot_info));
 425         s->format = -1;
 426 }
 427
 428 static void kill_stream_writer(int slot_num)
 429 {
 430         struct slot_info *s = &slot[slot_num];
 431
 432         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 433                 return;
 434         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 435                 s->wpid, audio_formats[s->format], slot_num);
 436         kill(s->wpid, SIGTERM);
 437         s->wkilled = 1;
 438         s->fci->error = 1;
 439 }
 440
 441 static void set_restart_barrier(int format, struct timeval *now)
 442 {
 443         struct timeval tmp;
 444
 445         if (now)
 446                 tmp = *now;
 447         else
 448                 gettimeofday(&tmp, NULL);
 449         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 450 }
 451
 452 static void close_receiver(int slot_num)
 453 {
 454         struct slot_info *s = &slot[slot_num];
 455         struct audio_format_info *a;
 456
 457         if (s->format < 0 || !s->receiver_node)
 458                 return;
 459         a = &afi[s->format];
 460         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 461                 audio_formats[s->format] , slot_num);
 462         a->receiver->close(s->receiver_node);
 463         free(s->receiver_node);
 464         s->receiver_node = NULL;
 465         set_restart_barrier(s->format, NULL);
 466 }
 467
 468 static void kill_all_decoders(void)
 469 {
 470         int i;
 471
 472         FOR_EACH_SLOT(i)
 473                 if (slot[i].format >= 0) {
 474                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 475                         kill_stream_writer(i);
 476                 }
 477 }
 478
 479 static void check_sigchld(void)
 480 {
 481         pid_t pid;
 482         int i;
 483         struct timeval now;
 484         gettimeofday(&now, NULL);
 485
 486 reap_next_child:
 487         pid = para_reap_child();
 488         if (pid <= 0)
 489                 return;
 490         FOR_EACH_SLOT(i) {
 491                 struct slot_info *s = &slot[i];
 492                 long lifetime;
 493                 if (s->format < 0)
 494                         continue;
 495                 if (pid == s->wpid) {
 496                         s->wpid = -1;
 497                         lifetime = now.tv_sec - s->wstime.tv_sec;
 498                         PARA_INFO_LOG("%s stream writer in slot %d died "
 499                                 "after %li secs\n",
 500                                 audio_formats[s->format], i, lifetime);
 501                         set_restart_barrier(s->format, &now);
 502                         goto reap_next_child;
 503                 }
 504         }
 505         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 506         goto reap_next_child;
 507 }
 508
 509 static int get_empty_slot(void)
 510 {
 511         int i;
 512         struct slot_info *s;
 513
 514         FOR_EACH_SLOT(i) {
 515                 s = &slot[i];
 516                 if (s->format < 0) {
 517                         clear_slot(i);
 518                         return i;
 519                 }
 520                 if (s->write_fd > 0 || s->wpid > 0)
 521                         continue;
 522                 if (s->receiver_node)
 523                         continue;
 524                 if (s->fci)
 525                         continue;
 526                 clear_slot(i);
 527                 return i;
 528         }
 529         return -E_NO_MORE_SLOTS;
 530 }
 531
 532 static int decoder_running(int format)
 533 {
 534         int i, ret = 0;
 535         struct slot_info *s;
 536
 537         FOR_EACH_SLOT(i) {
 538                 s = &slot[i];
 539                 if (s->format == format && s->receiver_node)
 540                         ret |= 1;
 541                 if (s->format == format && s->wpid > 0)
 542                         ret |= 2;
 543         }
 544         return ret;
 545 }
 546
 547 static void close_stat_pipe(void)
 548 {
 549         char *msg;
 550         int i;
 551
 552         if (stat_pipe < 0)
 553                 return;
 554         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 555         close(stat_pipe);
 556         del_close_on_fork_list(stat_pipe);
 557         stat_pipe = -1;
 558         kill_all_decoders();
 559         for (i = 0; i < RINGBUFFER_SIZE; i++)
 560                 free(ringbuffer_add(stat_item_ringbuf, para_strdup(NULL)));
 561         dump_empty_status();
 562         length_seconds = 0;
 563         offset_seconds = 0;
 564         audiod_status_dump();
 565         playing = 0;
 566         msg = make_message("%s:no connection to para_server\n",
 567                 status_item_list[SI_STATUS_BAR]);
 568         free(ringbuffer_add(stat_item_ringbuf, msg));
 569         stat_client_write(msg);
 570 }
 571
 572 static void __noreturn clean_exit(int status, const char *msg)
 573 {
 574         PARA_EMERG_LOG("%s\n", msg);
 575         kill_all_decoders();
 576         if (socket_name)
 577                 unlink(socket_name);
 578         if (stat_pipe >= 0)
 579                 close_stat_pipe();
 580         exit(status);
 581 }
 582
 583 __malloc static char *glob_cmd(char *cmd)
 584 {
 585         char *ret, *replacement;
 586         struct timeval tmp, delay, rss; /* real stream start */
 587
 588         delay.tv_sec = conf.stream_delay_arg / 1000;
 589         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 590 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 591         if (sa_time_diff_sign < 0)
 592                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 593         else
 594                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 595         tv_add(&rss, &delay, &tmp);
 596         replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
 597         ret = s_a_r(cmd, "STREAM_START", replacement);
 598         free(replacement);
 599         if (!ret)
 600                 goto out;
 601         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 602         {
 603         struct timeval now;
 604         gettimeofday(&now, NULL);
 605         PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
 606         }
 607 out:
 608         return ret;
 609 }
 610
 611 /** get the number of filters for the given audio format */
 612 int num_filters(int audio_format_num)
 613 {
 614         return afi[audio_format_num].num_filters;
 615 }
 616
 617 static void open_filters(int slot_num)
 618 {
 619         struct slot_info *s = &slot[slot_num];
 620         struct audio_format_info *a = &afi[s->format];
 621         int nf = a->num_filters;
 622         int i;
 623
 624         s->fci = para_calloc(sizeof(struct filter_chain_info));
 625         INIT_LIST_HEAD(&s->fci->filters);
 626         if (!nf)
 627                 return;
 628         s->fci->inbuf = s->receiver_node->buf;
 629         s->fci->in_loaded = &s->receiver_node->loaded;
 630         s->fci->outbuf = s->receiver_node->buf;
 631         s->fci->out_loaded = &s->receiver_node->loaded;
 632         s->fci->eof = &s->receiver_node->eof;
 633         for (i = 0; i < nf; i++) {
 634                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 635                 fn->conf = a->filter_conf[i];
 636                 fn->fci = s->fci;
 637                 fn->filter = a->filters[i];
 638                 INIT_LIST_HEAD(&fn->callbacks);
 639                 list_add_tail(&fn->node, &s->fci->filters);
 640                 fn->filter->open(fn);
 641                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 642                         audio_formats[s->format], i + 1,  nf,
 643                         fn->filter->name, slot_num);
 644                 s->fci->outbuf = fn->buf;
 645                 s->fci->out_loaded = &fn->loaded;
 646         }
 647         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 648                 s->fci->outbuf);
 649 }
 650
 651 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 652 {
 653         struct filter_node *fn;
 654         int i, j;
 655
 656         FOR_EACH_SLOT(i) {
 657                 struct slot_info *s = &slot[i];
 658                 if (s->format < 0 || !s->fci)
 659                         continue;
 660                 if (slot_num >= 0 && slot_num != i)
 661                         continue;
 662                 if (format >= 0 && s->format != format)
 663                         continue;
 664                 if (num_filters(i) < filternum)
 665                         continue;
 666                 /* success */
 667                 j = 1;
 668                 list_for_each_entry(fn, &s->fci->filters, node)
 669                         if (filternum <= 0 || j++ == filternum)
 670                                 break;
 671                 return fn;
 672         }
 673         return NULL;
 674 }
 675
 676 static void start_stream_writer(int slot_num)
 677 {
 678         int ret, fds[3] = {1, -1, -1};
 679         struct slot_info *s = &slot[slot_num];
 680         struct audio_format_info *a = &afi[s->format];
 681         char *glob = NULL;
 682
 683         if (a->write_cmd)
 684                 glob = glob_cmd(a->write_cmd);
 685         if (!glob)
 686                 glob = para_strdup("para_play");
 687         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 688         open_filters(slot_num);
 689         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 690         free(glob);
 691         if (ret < 0) {
 692                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 693                 return;
 694         }
 695         s->write_fd = fds[0];
 696         add_close_on_fork_list(s->write_fd);
 697         /* we write to this fd in do_select, so we need non-blocking */
 698         fcntl(s->write_fd, F_SETFL, O_NONBLOCK);
 699         gettimeofday(&s->wstime, NULL);
 700         current_decoder = slot_num;
 701         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 702 }
 703
 704 static void open_receiver(int format)
 705 {
 706         struct audio_format_info *a = &afi[format];
 707         struct slot_info *s;
 708         int ret, slot_num;
 709
 710         slot_num = get_empty_slot();
 711         if (slot_num < 0)
 712                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 713         s = &slot[slot_num];
 714         s->format = format;
 715         gettimeofday(&s->rtime, NULL);
 716         s->wtime = s->rtime;
 717         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 718         s->receiver_node->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 }
 730
 731 static int is_frozen(int format)
 732 {
 733         struct timeval now;
 734         struct audio_format_info *a = &afi[format];
 735
 736         gettimeofday(&now, NULL);
 737         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 738 }
 739
 740 static void start_current_receiver(void)
 741 {
 742         int i;
 743
 744         if (!af_status)
 745                 return;
 746         i = get_audio_format_num(af_status);
 747         if (i < 0)
 748                 return;
 749         if ((decoder_running(i) & 1) || is_frozen(i))
 750                 return;
 751         open_receiver(i);
 752 }
 753
 754 static void compute_time_diff(const struct timeval *status_time)
 755 {
 756         struct timeval now, tmp, diff;
 757         static int count;
 758         int sign;
 759         const struct timeval max_deviation = {0, 500 * 1000};
 760         const int time_smooth = 5;
 761
 762         gettimeofday(&now, NULL);
 763         sign = tv_diff(status_time, &now, &diff);
 764 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 765 //                      sign, sa_time_diff_sign);
 766         if (!count) {
 767                 sa_time_diff_sign = sign;
 768                 sa_time_diff = diff;
 769                 count++;
 770                 return;
 771         }
 772         if (count > 5) {
 773                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 774                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 775                         PARA_WARNING_LOG("time diff jump: %lims\n",
 776                                 s * tv2ms(&tmp));
 777         }
 778         count++;
 779         sa_time_diff_sign = tv_convex_combination(
 780                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 781                 count > 10? sign : sign * time_smooth, &diff,
 782                 &tmp);
 783         sa_time_diff = tmp;
 784         PARA_INFO_LOG("time diff (cur/avg): "
 785                 "%li:%lu/%li:%lu\n",
 786                 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
 787                 sa_time_diff_sign * sa_time_diff.tv_sec,
 788                 (sa_time_diff.tv_usec + 500)/ 1000);
 789 }
 790
 791 static void check_stat_line(char *line)
 792 {
 793         int itemnum;
 794         size_t ilen = 0;
 795         struct timeval tv;
 796
 797         if (!line)
 798                 return;
 799         free(ringbuffer_add(stat_item_ringbuf, para_strdup(line)));
 800         stat_client_write(line);
 801         itemnum = stat_line_valid(line);
 802         if (itemnum < 0)
 803                 return;
 804         ilen = strlen(status_item_list[itemnum]);
 805         switch (itemnum) {
 806         case SI_STATUS:
 807                 playing = strstr(line, "playing")? 1 : 0;
 808                 break;
 809         case SI_FORMAT:
 810                 free(af_status);
 811                 af_status = para_strdup(line + ilen + 1);
 812                 break;
 813         case SI_OFFSET:
 814                 offset_seconds = atoi(line + ilen + 1);
 815                 break;
 816         case SI_LENGTH:
 817                 length_seconds = atoi(line + ilen + 1);
 818                 break;
 819         case SI_STREAM_START:
 820                 if (sscanf(line + ilen + 1, "%lu.%lu",
 821                                 &tv.tv_sec, &tv.tv_usec) == 2)
 822                         server_stream_start = tv;
 823                 break;
 824         case SI_CURRENT_TIME:
 825                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 826                                 &tv.tv_usec) == 2)
 827                         compute_time_diff(&tv);
 828                 break;
 829         }
 830 }
 831
 832 static void handle_signal(int sig)
 833 {
 834         switch (sig) {
 835         case SIGCHLD:
 836                 return check_sigchld();
 837         case SIGINT:
 838         case SIGTERM:
 839         case SIGHUP:
 840                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 841                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 842                 return;
 843         }
 844 }
 845
 846 static void check_timeouts(void)
 847 {
 848         struct timeval now;
 849         int slot_num, timeout = conf.stream_timeout_arg;
 850
 851         gettimeofday(&now, NULL);
 852         FOR_EACH_SLOT(slot_num) {
 853                 struct slot_info *s = &slot[slot_num];
 854                 if (s->format < 0)
 855                         continue;
 856                 /* check read time */
 857                 if (s->receiver_node &&
 858                         now.tv_sec > s->rtime.tv_sec + timeout) {
 859                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 860                                 audio_formats[s->format], slot_num);
 861                         if (s->fci)
 862                                 s->fci->error = 42;
 863                         else
 864                                 close_receiver(slot_num);
 865                 }
 866                 /* check write time */
 867                 if (s->wpid > 0 && !s->wkilled &&
 868                         now.tv_sec > s->wtime.tv_sec + timeout) {
 869                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 870                                 audio_formats[s->format], slot_num);
 871                         if (s->fci)
 872                                 s->fci->error = 42;
 873                 }
 874         }
 875 }
 876
 877 static size_t get_loaded_bytes(int slot_num)
 878 {
 879         size_t loaded = 0;
 880         struct slot_info *s = &slot[slot_num];
 881         struct receiver_node *rn = s->receiver_node;
 882
 883         if (s->format < 0)
 884                 goto out;
 885
 886         if (afi[s->format].num_filters) {
 887                 if (s->fci)
 888                         loaded = *s->fci->out_loaded;
 889         } else {
 890                 if (rn)
 891                         loaded = rn->loaded;
 892         }
 893 out:
 894         return loaded;
 895 }
 896
 897
 898 static void close_decoder_if_idle(int slot_num)
 899 {
 900         struct slot_info *s = &slot[slot_num];
 901         struct receiver_node *rn = s->receiver_node;
 902
 903         if (s->format < 0)
 904                 return;
 905         if (!s->fci)
 906                 return;
 907         if (!rn->eof && !s->fci->error && s->wpid > 0)
 908                 return;
 909         if (!s->fci->error && s->wpid > 0) { /* eof */
 910                 if (filter_io(s->fci) > 0)
 911                         return;
 912                 if (get_loaded_bytes(slot_num))
 913                         return;
 914         }
 915         if (s->write_fd > 0) {
 916                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 917                         s->write_fd);
 918                 close(s->write_fd);
 919                 del_close_on_fork_list(s->write_fd);
 920                 s->write_fd = -1;
 921         }
 922         if (s->wpid > 0)
 923                 return; /* wait until writer dies before closing filters */
 924         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 925                 slot_num, s->fci);
 926         close_filters(s->fci);
 927         free(s->fci);
 928         close_receiver(slot_num);
 929         clear_slot(slot_num);
 930 }
 931
 932 static int set_stream_fds(fd_set *wfds)
 933 {
 934         int i, max_fileno = -1;
 935
 936         check_timeouts();
 937         FOR_EACH_SLOT(i) {
 938                 struct slot_info *s = &slot[i];
 939                 struct audio_format_info *a;
 940                 struct receiver_node *rn;
 941
 942                 close_decoder_if_idle(i);
 943                 s->wcheck = 0;
 944                 if (s->format < 0)
 945                         continue;
 946                 a = &afi[s->format];
 947                 rn = s->receiver_node;
 948                 if (rn && rn->loaded && !s->wpid) {
 949                         PARA_INFO_LOG("no writer in slot %d\n", i);
 950                         start_stream_writer(i);
 951                 }
 952                 if (s->write_fd <= 0)
 953                         continue;
 954                 if (!get_loaded_bytes(i))
 955                         continue;
 956                 FD_SET(s->write_fd, wfds);
 957                 s->wcheck = 1;
 958                 max_fileno = MAX(s->write_fd, max_fileno);
 959         }
 960 //      PARA_INFO_LOG("return %d\n", max_fileno);
 961         return max_fileno;
 962 }
 963
 964 static int write_audio_data(int slot_num)
 965 {
 966         struct slot_info *s = &slot[slot_num];
 967         struct audio_format_info *a = &afi[s->format];
 968         struct receiver_node *rn = s->receiver_node;
 969         int rv;
 970         char **buf;
 971         size_t *len;
 972
 973         if (a->num_filters) {
 974                 buf = &s->fci->outbuf;
 975                 len = s->fci->out_loaded;
 976         } else {
 977                 buf = &rn->buf;
 978                 len = &rn->loaded;
 979         }
 980         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
 981         rv = write(s->write_fd, *buf, *len);
 982         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
 983         if (rv < 0) {
 984                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
 985                         slot_num, s->write_fd, strerror(errno));
 986                 *len = 0;
 987                 s->fci->error = E_WRITE_AUDIO_DATA;
 988         } else if (rv != *len) {
 989                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
 990                         audio_formats[s->format], rv, *len, slot_num);
 991                 *len -= rv;
 992                 memmove(*buf, *buf + rv, *len);
 993         } else
 994                 *len = 0;
 995         if (rv > 0)
 996                 gettimeofday(&s->wtime, NULL);
 997         return rv;
 998 }
 999
1000 static void slot_io(fd_set *wfds)
1001 {
1002         int ret, i;
1003
1004         FOR_EACH_SLOT(i) {
1005                 struct slot_info *s = &slot[i];
1006                 struct receiver_node *rn = s->receiver_node;
1007
1008                 if (rn && rn->loaded)
1009                         gettimeofday(&s->rtime, NULL);
1010                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1011                         ret = filter_io(s->fci);
1012                         if (ret < 0)
1013                                 s->fci->error = -ret;
1014 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1015 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1016                 }
1017                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1018                         continue;
1019                 write_audio_data(i);
1020         }
1021 }
1022
1023 static int parse_stream_command(const char *txt, char **cmd)
1024 {
1025         char *p = strchr(txt, ':');
1026         int i;
1027
1028         if (!p)
1029                 return -E_MISSING_COLON;
1030         p++;
1031         FOR_EACH_AUDIO_FORMAT(i) {
1032                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1033                         continue;
1034                 *cmd = p;
1035                 return i;
1036         }
1037         return -E_UNSUPPORTED_AUDIO_FORMAT;
1038 }
1039
1040 static int add_filter(int format, char *cmdline)
1041 {
1042         struct audio_format_info *a = &afi[format];
1043         int filter_num, nf = a->num_filters;
1044
1045         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1046         if (filter_num < 0)
1047                 return filter_num;
1048         a->filters[nf] = &filters[filter_num];
1049         a->num_filters++;
1050         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1051                 a->filters[nf]->name);
1052         return filter_num;
1053 }
1054
1055 static int setup_default_filters(void)
1056 {
1057         int i, ret = 1;
1058
1059         FOR_EACH_AUDIO_FORMAT(i) {
1060                 struct audio_format_info *a = &afi[i];
1061                 char *tmp;
1062                 int j;
1063                 if (a->num_filters)
1064                         continue;
1065                 /* add "dec" to audio format name */
1066                 tmp = make_message("%sdec", audio_formats[i]);
1067                 for (j = 0; filters[j].name; j++)
1068                         if (!strcmp(tmp, filters[j].name))
1069                                 break;
1070                 free(tmp);
1071                 ret = -E_UNSUPPORTED_FILTER;
1072                 if (!filters[j].name)
1073                         goto out;
1074                 tmp = para_strdup(filters[j].name);
1075                 ret = add_filter(i, tmp);
1076                 free(tmp);
1077                 if (ret < 0)
1078                         goto out;
1079                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1080                 ret = add_filter(i, para_strdup("wav"));
1081                 if (ret < 0)
1082                         goto out;
1083                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1084         }
1085 out:
1086         return ret;
1087 }
1088
1089 static int init_stream_io(void)
1090 {
1091         int i, ret, receiver_num;
1092         char *cmd;
1093
1094         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1095                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1096                 if (ret < 0)
1097                         goto out;
1098                 afi[ret].write_cmd = para_strdup(cmd);
1099                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1100         }
1101         for (i = 0; receivers[i].name; i++) {
1102                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1103                 receivers[i].init(&receivers[i]);
1104         }
1105         for (i = 0; i < conf.receiver_given; i++) {
1106                 char *arg = conf.receiver_arg[i];
1107                 char *recv = strchr(arg, ':');
1108                 ret = -E_MISSING_COLON;
1109                 if (!recv)
1110                         goto out;
1111                 *recv = '\0';
1112                 recv++;
1113                 ret = get_audio_format_num(arg);
1114                 if (ret < 0)
1115                         goto out;
1116                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1117                 if (!afi[ret].receiver_conf) {
1118                         ret = -E_RECV_SYNTAX;
1119                         goto out;
1120                 }
1121                 afi[ret].receiver = &receivers[receiver_num];
1122         }
1123         /* use the first available receiver with no arguments
1124          * for those audio formats for which no receiver
1125          * was specified
1126          */
1127         cmd = para_strdup(receivers[0].name);
1128         FOR_EACH_AUDIO_FORMAT(i) {
1129                 struct audio_format_info *a = &afi[i];
1130                 if (a->receiver_conf)
1131                         continue;
1132                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1133                 if (!a->receiver_conf)
1134                         return -E_RECV_SYNTAX;
1135                 a->receiver = &receivers[receiver_num];
1136         }
1137         free(cmd);
1138         /* filters */
1139         filter_init(filters);
1140         FOR_EACH_AUDIO_FORMAT(i) {
1141                 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1142                 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1143         }
1144         if (!conf.no_default_filters_given)
1145                 return setup_default_filters();
1146         for (i = 0; i < conf.filter_given; i++) {
1147                 char *arg = conf.filter_arg[i];
1148                 char *filter_name = strchr(arg, ':');
1149                 ret = -E_MISSING_COLON;
1150                 if (!filter_name)
1151                         goto out;
1152                 *filter_name = '\0';
1153                 filter_name++;
1154                 ret = get_audio_format_num(arg);
1155                 if (ret < 0)
1156                         goto out;
1157                 ret = add_filter(ret, filter_name);
1158                 if (ret < 0)
1159                         goto out;
1160         }
1161         ret = 1;
1162 out:
1163         return ret;
1164 }
1165
1166 static int dump_commands(int fd)
1167 {
1168         char *buf = para_strdup(""), *tmp = NULL;
1169         int i;
1170         ssize_t ret;
1171
1172         FOR_EACH_COMMAND(i) {
1173                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1174                         cmds[i].description);
1175                 free(buf);
1176                 buf = tmp;
1177         }
1178         ret = client_write(fd, buf);
1179         free(buf);
1180         return ret;
1181 }
1182
1183 /*
1184  * command handlers don't close their fd on errors (ret < 0) so that
1185  * its caller can send an error message. Otherwise (ret >= 0) it's up
1186  * to each individual command to close the fd if necessary.
1187  */
1188
1189 static int com_help(int fd, int argc, char **argv)
1190 {
1191         int i, ret;
1192         char *buf;
1193         const char *dflt = "No such command. Available commands:\n";
1194
1195         if (argc < 2) {
1196                 ret = dump_commands(fd);
1197                 goto out;
1198         }
1199         FOR_EACH_COMMAND(i) {
1200                 if (strcmp(cmds[i].name, argv[1]))
1201                         continue;
1202                 buf = make_message(
1203                         "NAME\n\t%s -- %s\n"
1204                         "SYNOPSIS\n\tpara_audioc %s\n"
1205                         "DESCRIPTION\n%s\n",
1206                         argv[1],
1207                         cmds[i].description,
1208                         cmds[i].synopsis,
1209                         cmds[i].help
1210                 );
1211                 ret = client_write(fd, buf);
1212                 free(buf);
1213                 goto out;
1214         }
1215         ret = client_write(fd, dflt);
1216         if (ret > 0)
1217                 ret = dump_commands(fd);
1218 out:
1219         if (ret >= 0)
1220                 close(fd);
1221         return ret;
1222 }
1223
1224 static int com_stat(int fd, __unused int argc, __unused char **argv)
1225 {
1226         int i, ret;
1227         char *buf = audiod_status_string();
1228
1229         buf = para_strcat(buf, "\n");
1230         for (i = RINGBUFFER_SIZE - 1; i >= 0; i--) {
1231                 char *tmp, *line = ringbuffer_get(stat_item_ringbuf, i);
1232                 if (!line)
1233                         continue;
1234                 tmp = make_message("%s\n", line);
1235                 buf = para_strcat(buf, tmp);
1236                 free(tmp);
1237         }
1238         ret = client_write(fd, buf);
1239         if (ret > 0)
1240                 ret = stat_client_add(fd);
1241         free(buf);
1242         return ret;
1243 }
1244
1245 #if 0
1246 static char *list_filters(void)
1247 {
1248         int i, j;
1249         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1250
1251         FOR_EACH_AUDIO_FORMAT(i) {
1252                 for (j = 0; j < afi[i].num_filters; j++) {
1253                         tmp = make_message("%s\t%i\t%s\n",
1254                                 afi[i].name, j, afi[i].filter_cmds[j]);
1255                         msg = para_strcat(msg, tmp);
1256                         free(tmp);
1257                 }
1258                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1259                         j, afi[i].write_cmd);
1260                 msg = para_strcat(msg, tmp);
1261                 free(tmp);
1262         }
1263         return msg;
1264 }
1265 #endif
1266
1267 static int com_grab(int fd, int argc, char **argv)
1268 {
1269         struct grab_client *gc;
1270         struct filter_node *fn;
1271         int err;
1272
1273         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1274         gc = grab_client_new(fd, argc, argv, &err);
1275         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1276         if (!gc)
1277                 goto err_out;
1278         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1279         if (fn)
1280                 activate_grab_client(gc, fn);
1281         return 1;
1282 err_out:
1283         if (err != -E_GC_HELP_GIVEN)
1284                 return err;
1285         err = client_write(fd, "Usage: para_audioc [audioc_options] -- "
1286                 "grab [grab_options]\nAvailable options:\n");
1287         if (err < 0)
1288                 return err;
1289         err = client_write(fd, GRAB_HELP_TXT);
1290         if (err < 0)
1291                 return err;
1292         close(fd);
1293         return 1;
1294 }
1295
1296 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1297 {
1298         close(fd);
1299         clean_exit(EXIT_SUCCESS, "terminating on user request");
1300 }
1301
1302 static int com_on(int fd, __unused int argc, __unused char **argv)
1303 {
1304         audiod_status = AUDIOD_ON;
1305         close(fd);
1306         return 1;
1307 }
1308
1309 static int com_off(int fd, __unused int argc, __unused char **argv)
1310 {
1311         audiod_status = AUDIOD_OFF;
1312         close(fd);
1313         return 1;
1314 }
1315
1316 static int com_sb(int fd, __unused int argc, __unused char **argv)
1317 {
1318         audiod_status = AUDIOD_STANDBY;
1319         close(fd);
1320         return 1;
1321 }
1322
1323 static int com_cycle(int fd, int argc, char **argv)
1324 {
1325         switch (audiod_status) {
1326                 case  AUDIOD_ON:
1327                         return com_sb(fd, argc, argv);
1328                         break;
1329                 case  AUDIOD_OFF:
1330                         return com_on(fd, argc, argv);
1331                         break;
1332                 case  AUDIOD_STANDBY:
1333                         return com_off(fd, argc, argv);
1334                         break;
1335         }
1336         close(fd);
1337         return 1;
1338 }
1339
1340 static int check_perms(struct ucred *c)
1341 {
1342         int i;
1343
1344         if (!conf.user_allow_given)
1345                 return 1;
1346         for (i = 0; i < conf.user_allow_given; i++)
1347                 if (c->uid == conf.user_allow_arg[i])
1348                         return 1;
1349         return -E_UCRED_PERM;
1350 }
1351
1352 static int handle_connect(void)
1353 {
1354         int i, argc, ret, clifd = -1;
1355         struct ucred c;
1356         char *buf = para_malloc(MAXLINE), **argv = NULL;
1357         struct sockaddr_un unix_addr;
1358
1359         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1360         if (ret < 0)
1361                 goto out;
1362         clifd = ret;
1363         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1364         if (ret < 0)
1365                 goto out;
1366         PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1367         buf[ret] = '\0';
1368         ret = check_perms(&c);
1369         if (ret < 0)
1370                 goto out;
1371         argc = split_args(buf, &argv, '\n');
1372         PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
1373         for (i = 0; cmds[i].name; i++) {
1374                 if (strcmp(cmds[i].name, argv[0]))
1375                         continue;
1376                 ret = cmds[i].handler(clifd, argc + 1, argv);
1377                 goto out;
1378         }
1379         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1380 out:
1381         free(buf);
1382         free(argv);
1383         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1384                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1385                 client_write(clifd, tmp);
1386                 free(tmp);
1387                 close(clifd);
1388         }
1389         return ret;
1390 }
1391
1392 static void audiod_get_socket(void)
1393 {
1394         struct sockaddr_un unix_addr;
1395
1396         if (conf.socket_given)
1397                 socket_name = para_strdup(conf.socket_arg);
1398         else {
1399                 char *hn = para_hostname();
1400                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1401                         hn);
1402                 free(hn);
1403         }
1404         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1405         if (conf.force_given)
1406                 unlink(socket_name);
1407         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1408                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1409         if (audiod_socket < 0) {
1410                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1411                 exit(EXIT_FAILURE); /* do not unlink socket */
1412         }
1413         if (listen(audiod_socket, 5) < 0) {
1414                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1415                 exit(EXIT_FAILURE); /* do not unlink socket */
1416         }
1417         add_close_on_fork_list(audiod_socket);
1418 }
1419
1420 static int open_stat_pipe(void)
1421 {
1422         int ret, fd[3] = {-1, 1, 0};
1423         pid_t pid;
1424         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1425         if (ret >= 0) {
1426                 ret = fd[1];
1427                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1428                 add_close_on_fork_list(ret);
1429         } else
1430                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1431         return ret;
1432 }
1433
1434 static int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
1435 {
1436         int i, ret, max = -1;
1437
1438         FOR_EACH_SLOT(i) {
1439                 struct slot_info *s = &slot[i];
1440                 struct audio_format_info *a;
1441                 struct receiver_node *rn = s->receiver_node;
1442                 if (s->format < 0 || !rn)
1443                         continue;
1444                 a = &afi[s->format];
1445                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1446 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1447                 max = MAX(max, ret);
1448         }
1449         return max;
1450
1451 }
1452 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1453 {
1454         int i, ret;
1455
1456         FOR_EACH_SLOT(i) {
1457                 struct slot_info *s = &slot[i];
1458                 struct audio_format_info *a;
1459                 struct receiver_node *rn = s->receiver_node;
1460                 if (s->format < 0 || !rn || rn->eof)
1461                         continue;
1462                 a = &afi[s->format];
1463                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1464                 if (ret <= 0) {
1465                         if (ret)
1466                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1467                                 a->receiver->name, PARA_STRERROR(-ret), i);
1468                         else
1469                                 PARA_INFO_LOG("eof in slot %d\n", i);
1470                         rn->eof = 1;
1471                 }
1472                 if (ret < 0 && s->fci)
1473                         s->fci->error = ret;
1474         }
1475 }
1476
1477 /* TODO: move everything before the select call to pre_select() */
1478 static void __noreturn audiod_mainloop(void)
1479 {
1480         fd_set rfds, wfds;
1481         int ret, max_fileno, sbo = 0;
1482         char status_buf[STRINGSIZE] = "";
1483         struct timeval tv;
1484 repeat:
1485         FD_ZERO(&rfds);
1486         FD_ZERO(&wfds);
1487         max_fileno = 0;
1488         if (audiod_status != AUDIOD_ON)
1489                 kill_all_decoders();
1490         else if (playing)
1491                 start_current_receiver();
1492         max_fileno = set_stream_fds(&wfds);
1493         /* stat pipe (read) */
1494         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1495                 close_stat_pipe();
1496         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1497                 stat_pipe = open_stat_pipe();
1498                 sbo = 0;
1499                 status_buf[0] = '\0';
1500         }
1501         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
1502                 FD_SET(stat_pipe, &rfds);
1503                 max_fileno = MAX(max_fileno, stat_pipe);
1504         }
1505         /* always check signal pipe */
1506         FD_SET(signal_pipe, &rfds);
1507         max_fileno = MAX(max_fileno, signal_pipe);
1508         /* local socket */
1509         if (audiod_socket < 0)
1510                 audiod_get_socket(); /* doesn't return on errors */
1511         FD_SET(audiod_socket, &rfds);
1512         max_fileno = MAX(max_fileno, audiod_socket);
1513         tv.tv_sec = 0;
1514         tv.tv_usec = 200 * 1000;
1515         ret = pre_select(&rfds, &wfds, &tv);
1516         max_fileno = MAX(max_fileno, ret);
1517         ret = select(max_fileno + 1, &rfds, &wfds, NULL, &tv);
1518         if (ret < 0 && errno != EINTR)
1519                 PARA_ERROR_LOG("select returned %d (%s)\n", ret,
1520                         strerror(errno));
1521         if (audiod_status != AUDIOD_OFF)
1522                 audiod_status_dump();
1523         if (ret < 0)
1524                 goto repeat;
1525         audiod_post_select(ret, &rfds, &wfds);
1526         /* read status pipe */
1527         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1528                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1529                 if (ret <= 0) {
1530                         close_stat_pipe();
1531                         /* avoid busy loop if server is down */
1532                         while (sleep(1) > 0)
1533                                 ; /* try again*/
1534                 } else {
1535                         status_buf[ret + sbo] = '\0';
1536                         sbo = for_each_line(status_buf, ret + sbo,
1537                                 &check_stat_line);
1538                 }
1539         }
1540         slot_io(&wfds);
1541         if (FD_ISSET(audiod_socket, &rfds)) {
1542                 ret = handle_connect();
1543                 if (ret < 0) {
1544                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1545                 }
1546         }
1547         /* signals */
1548         if (FD_ISSET(signal_pipe, &rfds)) {
1549                 int sig_nr = para_next_signal();
1550                 if (sig_nr > 0)
1551                         handle_signal(sig_nr);
1552         }
1553         goto repeat;
1554 }
1555
1556 static void set_initial_status(void)
1557 {
1558         audiod_status = AUDIOD_ON;
1559         if (!conf.mode_given)
1560                 return;
1561         if (!strcmp(conf.mode_arg, "sb")) {
1562                 audiod_status = AUDIOD_STANDBY;
1563                 return;
1564         }
1565         if (!strcmp(conf.mode_arg, "off")) {
1566                 audiod_status = AUDIOD_OFF;
1567                 return;
1568         }
1569         if (strcmp(conf.mode_arg, "on"))
1570                 PARA_WARNING_LOG("%s", "invalid mode\n");
1571 }
1572
1573 int __noreturn main(int argc, char *argv[])
1574 {
1575         char *cf;
1576         int i;
1577
1578         valid_fd_012();
1579         hostname = para_hostname();
1580         cmdline_parser(argc, argv, &conf);
1581         para_drop_privileges(conf.user_arg);
1582         cf = configfile_exists();
1583         if (cf) {
1584                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1585                         fprintf(stderr, "parse error in config file\n");
1586                         exit(EXIT_FAILURE);
1587                 }
1588         }
1589         log_welcome("para_audiod", conf.loglevel_arg);
1590         i = init_stream_io();
1591         if (i < 0) {
1592                 fprintf(stderr, "init stream io error: %s\n",
1593                         PARA_STRERROR(-i));
1594                 exit(EXIT_FAILURE);
1595         }
1596         server_uptime(UPTIME_SET);
1597         set_initial_status();
1598         FOR_EACH_SLOT(i)
1599                 clear_slot(i);
1600         stat_item_ringbuf = ringbuffer_new(RINGBUFFER_SIZE);
1601         init_grabbing();
1602         setup_signal_handling();
1603         if (conf.daemon_given)
1604                 daemon_init();
1605         audiod_mainloop();
1606 }