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[] = {
 141
 142 [AUDIO_FORMAT_MP3] =
 143         {
 144                 .write_cmd = "para_play",
 145         },
 146 [AUDIO_FORMAT_OGG] =
 147         {
 148                 .write_cmd = "para_play",
 149         },
 150 };
 151
 152 static struct audiod_command cmds[] = {
 153 {
 154 .name = "cycle",
 155 .handler = com_cycle,
 156 .description = "switch to next mode",
 157 .synopsis = "cycle",
 158 .help =
 159
 160 "on -> standby -> off -> on\n"
 161
 162 },
 163 {
 164 .name = "grab",
 165 .handler = com_grab,
 166 .description = "grab the audio stream",
 167 .synopsis = "-- grab [grab_options]",
 168 .help =
 169 "grab ('splice') the audio stream at any position in the filter      \n"
 170 "chain and send that data back to the client. \n"
 171 "Available options:\n\n"
 172 GRAB_HELP_TXT
 173 },
 174 {
 175 .name = "help",
 176 .handler = com_help,
 177 .description = "display command list or help for given command",
 178 .synopsis = "help [command]",
 179 .help =
 180
 181 "When I was younger, so much younger than today, I never needed\n"
 182 "anybody's help in any way. But now these days are gone, I'm not so\n"
 183 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 184 "\n"
 185 "                               -- Beatles: Help\n"
 186
 187 },
 188 {
 189 .name = "off",
 190 .handler = com_off,
 191 .description = "deactivate para_audiod",
 192 .synopsis = "off",
 193 .help =
 194
 195 "Close connection to para_server and stop all decoders.\n"
 196
 197 },
 198 {
 199 .name = "on",
 200 .handler = com_on,
 201 .description = "activate para_audiod",
 202 .synopsis = "on",
 203 .help =
 204
 205 "Establish connection to para_server, retrieve para_server's current\n"
 206 "status. If playing, start corresponding decoder. Otherwise stop\n"
 207 "all decoders.\n"
 208
 209 },
 210 {
 211 .name = "sb",
 212 .handler = com_sb,
 213 .description = "enter standby mode",
 214 .synopsis = "sb",
 215 .help =
 216
 217 "Stop all decoders but leave connection to para_server open.\n"
 218
 219 },
 220 {
 221 .name = "stat",
 222 .handler = com_stat,
 223 .description = "print status information",
 224 .synopsis = "stat",
 225 .help =
 226
 227 "Add para_audiod status information to para_server's status information\n"
 228 "and dump everything to stdout.\n"
 229
 230 },
 231 {
 232 .name = "term",
 233 .handler = com_term,
 234 .description = "terminate audiod",
 235 .synopsis = "term",
 236 .help =
 237
 238 "Stop all decoders, shut down connection to para_server and exit.\n"
 239
 240 },
 241 {
 242 .name = NULL,
 243 }
 244 };
 245
 246 /** iterate over all slots */
 247 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
 248 /** iterate over all supported audio formats */
 249 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 250 /** iterate over the array of all audiod commands */
 251 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 252
 253 /**
 254  * get the audio format number
 255  * \param name the name of the audio format
 256  *
 257  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 258  * \a name is not a supported audio format.
 259  */
 260 int get_audio_format_num(char *name)
 261 {
 262         int i;
 263         FOR_EACH_AUDIO_FORMAT(i)
 264                 if (!strcmp(name, audio_formats[i]))
 265                         return i;
 266         return -E_UNSUPPORTED_AUDIO_FORMAT;
 267 }
 268
 269 /*
 270  * log function. first argument is loglevel.
 271  */
 272 void para_log(int ll, char* fmt,...)
 273 {
 274         va_list argp;
 275         FILE *outfd;
 276         struct tm *tm;
 277         time_t t1;
 278         char str[MAXLINE] = "";
 279
 280         if (ll < conf.loglevel_arg)
 281                 return;
 282         if (!logfile && conf.logfile_given)
 283                 logfile = open_log(conf.logfile_arg);
 284         if (!logfile && conf.daemon_given)
 285                 return;
 286         if (!logfile) {
 287                 if (ll < WARNING)
 288                         outfd = stdout;
 289                 else
 290                         outfd = stderr;
 291         } else
 292                 outfd = logfile;
 293         time(&t1);
 294         tm = localtime(&t1);
 295         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 296         fprintf(outfd, "%s %s ", str, hostname);
 297         if (conf.loglevel_arg <= INFO)
 298                 fprintf(outfd, "%i ", ll);
 299         va_start(argp, fmt);
 300         vfprintf(outfd, fmt, argp);
 301         va_end(argp);
 302 }
 303
 304 static int client_write(int fd, const char *buf)
 305 {
 306         size_t len = strlen(buf);
 307         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 308 }
 309
 310 static char *get_time_string(struct timeval *newest_stime)
 311 {
 312         struct timeval now, diff, adj_stream_start, tmp;
 313         int total = 0, use_server_time = 1;
 314
 315         if (!playing)
 316                 return make_message("%s:", length_seconds?
 317                         "" : status_item_list[SI_PLAY_TIME]);
 318         if (audiod_status == AUDIOD_OFF)
 319                 goto out;
 320         if (sa_time_diff_sign > 0)
 321                 tv_diff(&server_stream_start, &sa_time_diff,
 322                         &adj_stream_start);
 323         else
 324                 tv_add(&server_stream_start, &sa_time_diff,
 325                         &adj_stream_start);
 326         tmp = adj_stream_start;
 327         if (newest_stime && audiod_status == AUDIOD_ON) {
 328                 tv_diff(newest_stime, &adj_stream_start, &diff);
 329                 if (tv2ms(&diff) < 5000) {
 330                         tmp = *newest_stime;
 331                         use_server_time = 0;
 332                 }
 333         }
 334         gettimeofday(&now, NULL);
 335         tv_diff(&now, &tmp, &diff);
 336         total = diff.tv_sec + offset_seconds;
 337         if (total > length_seconds)
 338                 total = length_seconds;
 339         if (total < 0)
 340                 total = 0;
 341 out:
 342         return make_message(
 343                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 344                 status_item_list[SI_PLAY_TIME],
 345                 use_server_time? "~" : "",
 346                 total / 60,
 347                 total % 60,
 348                 (length_seconds - total) / 60,
 349                 (length_seconds - total) % 60,
 350                 length_seconds? (total * 100 + length_seconds / 2) /
 351                         length_seconds : 0,
 352                 length_seconds / 60,
 353                 length_seconds % 60
 354         );
 355 }
 356
 357 static char *audiod_status_string(void)
 358 {
 359         int i;
 360         struct timeval *newest_stime = NULL;
 361         char *ret, *time_string, *uptime_string, *decoder_flags =
 362                 para_malloc((MAX_STREAM_SLOTS + 1) * sizeof(char));
 363
 364         FOR_EACH_SLOT(i) {
 365                 struct slot_info *s = &slot[i];
 366                 char flag = '0';
 367                 if (s->receiver_node)
 368                         flag += 1;
 369                 if (s->wpid > 0)
 370                         flag += 2;
 371                 if (flag != '0')
 372                         flag += s->format * 4;
 373                 decoder_flags[i] = flag;
 374                 if (s->wpid <= 0)
 375                         continue;
 376                 if (newest_stime && tv_diff(&s->wstime, newest_stime, NULL) <= 0)
 377                         continue;
 378                 newest_stime = &s->wstime;
 379         }
 380         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 381         time_string = get_time_string(newest_stime);
 382         uptime_string = uptime_str();
 383         ret = make_message("%s:%s\n%s:%s\n%s:%s\n%s",
 384                 status_item_list[SI_AUDIOD_UPTIME], uptime_string,
 385                 status_item_list[SI_DECODER_FLAGS], decoder_flags,
 386                 status_item_list[SI_AUDIOD_STATUS], audiod_status == AUDIOD_ON?
 387                         "on" : (audiod_status == AUDIOD_OFF? "off": "sb"),
 388                 time_string);
 389         free(uptime_string);
 390         free(decoder_flags);
 391         free(time_string);
 392         return ret;
 393 }
 394
 395 static char *configfile_exists(void)
 396 {
 397         static char *config_file;
 398
 399         if (!config_file) {
 400                 char *home = para_homedir();
 401                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 402                 free(home);
 403         }
 404         return file_exists(config_file)? config_file : NULL;
 405 }
 406
 407 static void setup_signal_handling(void)
 408 {
 409         signal_pipe = para_signal_init();
 410         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 411         para_install_sighandler(SIGINT);
 412         para_install_sighandler(SIGTERM);
 413         para_install_sighandler(SIGCHLD);
 414         para_install_sighandler(SIGHUP);
 415         signal(SIGPIPE, SIG_IGN);
 416 }
 417
 418 static void audiod_status_dump(void)
 419 {
 420         static char *prev_status;
 421         char *tmp = audiod_status_string();
 422
 423         if (!prev_status || strcmp(tmp, prev_status))
 424                 stat_client_write(tmp);
 425         free(prev_status);
 426         prev_status = tmp;
 427 }
 428
 429 static void clear_slot(int slot_num)
 430 {
 431         struct slot_info *s = &slot[slot_num];
 432
 433         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 434         memset(s, 0, sizeof(struct slot_info));
 435         s->format = -1;
 436 }
 437
 438 static void kill_stream_writer(int slot_num)
 439 {
 440         struct slot_info *s = &slot[slot_num];
 441
 442         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 443                 return;
 444         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 445                 s->wpid, audio_formats[s->format], slot_num);
 446         kill(s->wpid, SIGTERM);
 447         s->wkilled = 1;
 448         s->fci->error = 1;
 449 }
 450
 451 static void close_receiver(int slot_num)
 452 {
 453         struct slot_info *s = &slot[slot_num];
 454         struct audio_format_info *a;
 455         struct timeval now;
 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         gettimeofday(&now, NULL);
 466         tv_add(&now, &restart_delay, &a->restart_barrier); /* FIXME: Use set_restart_barrier() */
 467 }
 468
 469 static void kill_all_decoders(void)
 470 {
 471         int i;
 472
 473         FOR_EACH_SLOT(i)
 474                 if (slot[i].format >= 0) {
 475                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 476                         kill_stream_writer(i);
 477                 }
 478 }
 479
 480 static void set_restart_barrier(int format, struct timeval *now)
 481 {
 482         struct timeval tmp;
 483
 484         if (now)
 485                 tmp = *now;
 486         else
 487                 gettimeofday(&tmp, NULL);
 488         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 489 }
 490
 491 static void check_sigchld(void)
 492 {
 493         pid_t pid;
 494         int i;
 495         struct timeval now;
 496         gettimeofday(&now, NULL);
 497
 498 reap_next_child:
 499         pid = para_reap_child();
 500         if (pid <= 0)
 501                 return;
 502         FOR_EACH_SLOT(i) {
 503                 struct slot_info *s = &slot[i];
 504                 long lifetime;
 505                 if (s->format < 0)
 506                         continue;
 507                 if (pid == s->wpid) {
 508                         s->wpid = -1;
 509                         lifetime = now.tv_sec - s->wstime.tv_sec;
 510                         PARA_INFO_LOG("%s stream writer in slot %d died "
 511                                 "after %li secs\n",
 512                                 audio_formats[s->format], i, lifetime);
 513                         set_restart_barrier(s->format, &now);
 514                         goto reap_next_child;
 515                 }
 516         }
 517         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 518         goto reap_next_child;
 519 }
 520
 521 static int get_empty_slot(void)
 522 {
 523         int i;
 524         struct slot_info *s;
 525
 526         FOR_EACH_SLOT(i) {
 527                 s = &slot[i];
 528                 if (s->format < 0) {
 529                         clear_slot(i);
 530                         return i;
 531                 }
 532                 if (s->write_fd > 0 || s->wpid > 0)
 533                         continue;
 534                 if (s->receiver_node)
 535                         continue;
 536                 if (s->fci)
 537                         continue;
 538                 clear_slot(i);
 539                 return i;
 540         }
 541         return -E_NO_MORE_SLOTS;
 542 }
 543
 544 static int decoder_running(int format)
 545 {
 546         int i, ret = 0;
 547         struct slot_info *s;
 548
 549         FOR_EACH_SLOT(i) {
 550                 s = &slot[i];
 551                 if (s->format == format && s->receiver_node)
 552                         ret |= 1;
 553                 if (s->format == format && s->wpid > 0)
 554                         ret |= 2;
 555         }
 556         return ret;
 557 }
 558
 559 static void close_stat_pipe(void)
 560 {
 561         char *msg;
 562         int i;
 563
 564         if (stat_pipe < 0)
 565                 return;
 566         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 567         close(stat_pipe);
 568         del_close_on_fork_list(stat_pipe);
 569         stat_pipe = -1;
 570         kill_all_decoders();
 571         for (i = 0; i < RINGBUFFER_SIZE; i++)
 572                 free(ringbuffer_add(stat_item_ringbuf, para_strdup(NULL)));
 573         dump_empty_status();
 574         length_seconds = 0;
 575         offset_seconds = 0;
 576         audiod_status_dump();
 577         playing = 0;
 578         msg = make_message("%s:no connection to para_server\n",
 579                 status_item_list[SI_STATUS_BAR]);
 580         free(ringbuffer_add(stat_item_ringbuf, msg));
 581         stat_client_write(msg);
 582 }
 583
 584 static void __noreturn clean_exit(int status, const char *msg)
 585 {
 586         PARA_EMERG_LOG("%s\n", msg);
 587         kill_all_decoders();
 588         if (socket_name)
 589                 unlink(socket_name);
 590         if (stat_pipe >= 0)
 591                 close_stat_pipe();
 592         exit(status);
 593 }
 594
 595 static char *glob_cmd(char *cmd)
 596 {
 597         char *ret, *replacement;
 598         struct timeval tmp, delay, rss; /* real stream start */
 599
 600         delay.tv_sec = conf.stream_delay_arg / 1000;
 601         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 602 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 603         if (sa_time_diff_sign < 0)
 604                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 605         else
 606                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 607         tv_add(&rss, &delay, &tmp);
 608         replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
 609         ret = s_a_r(cmd, "STREAM_START", replacement);
 610         free(replacement);
 611         if (!ret)
 612                 goto out;
 613         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 614         {
 615         struct timeval now;
 616         gettimeofday(&now, NULL);
 617         PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
 618         }
 619 out:
 620         return ret;
 621 }
 622
 623 /** get the number of filters for the given audio format */
 624 int num_filters(int audio_format_num)
 625 {
 626         return afi[audio_format_num].num_filters;
 627 }
 628
 629 static void open_filters(int slot_num)
 630 {
 631         struct slot_info *s = &slot[slot_num];
 632         struct audio_format_info *a = &afi[s->format];
 633         int nf = a->num_filters;
 634         int i;
 635
 636         s->fci = para_calloc(sizeof(struct filter_chain_info));
 637         INIT_LIST_HEAD(&s->fci->filters);
 638         if (!nf)
 639                 return;
 640         s->fci->inbuf = s->receiver_node->buf;
 641         s->fci->in_loaded = &s->receiver_node->loaded;
 642         s->fci->outbuf = s->receiver_node->buf;
 643         s->fci->out_loaded = &s->receiver_node->loaded;
 644         s->fci->eof = &s->receiver_node->eof;
 645         for (i = 0; i < nf; i++) {
 646                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 647                 fn->conf = a->filter_conf[i];
 648                 fn->fci = s->fci;
 649                 fn->filter = a->filters[i];
 650                 INIT_LIST_HEAD(&fn->callbacks);
 651                 list_add_tail(&fn->node, &s->fci->filters);
 652                 fn->filter->open(fn);
 653                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 654                         audio_formats[s->format], i + 1,  nf,
 655                         fn->filter->name, slot_num);
 656                 s->fci->outbuf = fn->buf;
 657                 s->fci->out_loaded = &fn->loaded;
 658         }
 659         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 660                 s->fci->outbuf);
 661 }
 662
 663 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 664 {
 665         struct filter_node *fn;
 666         int i, j;
 667
 668         FOR_EACH_SLOT(i) {
 669                 struct slot_info *s = &slot[i];
 670                 if (s->format < 0 || !s->fci)
 671                         continue;
 672                 if (slot_num >= 0 && slot_num != i)
 673                         continue;
 674                 if (format >= 0 && s->format != format)
 675                         continue;
 676                 if (num_filters(i) < filternum)
 677                         continue;
 678                 /* success */
 679                 j = 1;
 680                 list_for_each_entry(fn, &s->fci->filters, node)
 681                         if (filternum <= 0 || j++ == filternum)
 682                                 break;
 683                 return fn;
 684         }
 685         return NULL;
 686 }
 687
 688 static void start_stream_writer(int slot_num)
 689 {
 690         int ret, fds[3] = {1, -1, -1};
 691         struct slot_info *s = &slot[slot_num];
 692         struct audio_format_info *a = &afi[s->format];
 693         char *glob = glob_cmd(a->write_cmd);
 694
 695         PARA_INFO_LOG("starting stream writer: %s\n", glob? glob : a->write_cmd);
 696         open_filters(slot_num);
 697
 698         ret = para_exec_cmdline_pid(&s->wpid, glob? glob : a->write_cmd, fds);
 699         free(glob);
 700         if (ret < 0) {
 701                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 702                 return;
 703         }
 704         s->write_fd = fds[0];
 705         add_close_on_fork_list(s->write_fd);
 706         /* we write to this fd in do_select, so we need non-blocking */
 707         fcntl(s->write_fd, F_SETFL, O_NONBLOCK);
 708         gettimeofday(&s->wstime, NULL);
 709         current_decoder = slot_num;
 710         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 711 }
 712
 713 static void open_receiver(int format)
 714 {
 715         struct audio_format_info *a = &afi[format];
 716         struct slot_info *s;
 717         int ret, slot_num;
 718
 719         slot_num = get_empty_slot();
 720         if (slot_num < 0)
 721                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 722         s = &slot[slot_num];
 723         s->format = format;
 724         gettimeofday(&s->rtime, NULL);
 725         s->wtime = s->rtime;
 726         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 727         s->receiver_node->conf = a->receiver_conf;
 728         ret = a->receiver->open(s->receiver_node);
 729         if (ret < 0) {
 730                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 731                         PARA_STRERROR(-ret));
 732                 free(s->receiver_node);
 733                 s->receiver_node = NULL;
 734                 return;
 735         }
 736         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 737                 audio_formats[s->format], a->receiver->name, slot_num);
 738 }
 739
 740 static int is_frozen(int format)
 741 {
 742         struct timeval now;
 743         struct audio_format_info *a = &afi[format];
 744
 745         gettimeofday(&now, NULL);
 746         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 747 }
 748
 749 static void start_current_receiver(void)
 750 {
 751         int i;
 752
 753         if (!af_status)
 754                 return;
 755         i = get_audio_format_num(af_status);
 756         if (i < 0)
 757                 return;
 758         if ((decoder_running(i) & 1) || is_frozen(i))
 759                 return;
 760         open_receiver(i);
 761 }
 762
 763 static void compute_time_diff(const struct timeval *status_time)
 764 {
 765         struct timeval now, tmp, diff;
 766         static int count;
 767         int sign;
 768         const struct timeval max_deviation = {0, 500 * 1000};
 769         const int time_smooth = 5;
 770
 771         gettimeofday(&now, NULL);
 772         sign = tv_diff(status_time, &now, &diff);
 773 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 774 //                      sign, sa_time_diff_sign);
 775         if (!count) {
 776                 sa_time_diff_sign = sign;
 777                 sa_time_diff = diff;
 778                 count++;
 779                 return;
 780         }
 781         if (count > 5) {
 782                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 783                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 784                         PARA_WARNING_LOG("time diff jump: %lims\n",
 785                                 s * tv2ms(&tmp));
 786         }
 787         count++;
 788         sa_time_diff_sign = tv_convex_combination(
 789                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 790                 count > 10? sign : sign * time_smooth, &diff,
 791                 &tmp);
 792         sa_time_diff = tmp;
 793         PARA_INFO_LOG("time diff (cur/avg): "
 794                 "%li:%lu/%li:%lu\n",
 795                 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
 796                 sa_time_diff_sign * sa_time_diff.tv_sec,
 797                 (sa_time_diff.tv_usec + 500)/ 1000);
 798 }
 799
 800 static void check_stat_line(char *line)
 801 {
 802         int itemnum;
 803         size_t ilen = 0;
 804         struct timeval tv;
 805
 806         if (!line)
 807                 return;
 808         free(ringbuffer_add(stat_item_ringbuf, para_strdup(line)));
 809         stat_client_write(line);
 810         itemnum = stat_line_valid(line);
 811         if (itemnum < 0)
 812                 return;
 813         ilen = strlen(status_item_list[itemnum]);
 814         switch (itemnum) {
 815         case SI_STATUS:
 816                 playing = strstr(line, "playing")? 1 : 0;
 817                 break;
 818         case SI_FORMAT:
 819                 free(af_status);
 820                 af_status = para_strdup(line + ilen + 1);
 821                 break;
 822         case SI_OFFSET:
 823                 offset_seconds = atoi(line + ilen + 1);
 824                 break;
 825         case SI_LENGTH:
 826                 length_seconds = atoi(line + ilen + 1);
 827                 break;
 828         case SI_STREAM_START:
 829                 if (sscanf(line + ilen + 1, "%lu.%lu",
 830                                 &tv.tv_sec, &tv.tv_usec) == 2)
 831                         server_stream_start = tv;
 832                 break;
 833         case SI_CURRENT_TIME:
 834                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 835                                 &tv.tv_usec) == 2)
 836                         compute_time_diff(&tv);
 837                 break;
 838         }
 839 }
 840
 841 static void handle_signal(int sig)
 842 {
 843         switch (sig) {
 844         case SIGCHLD:
 845                 return check_sigchld();
 846         case SIGINT:
 847         case SIGTERM:
 848         case SIGHUP:
 849                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 850                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 851                 return;
 852         }
 853 }
 854
 855 static void check_timeouts(void)
 856 {
 857         struct timeval now;
 858         int slot_num, timeout = conf.stream_timeout_arg;
 859
 860         gettimeofday(&now, NULL);
 861         FOR_EACH_SLOT(slot_num) {
 862                 struct slot_info *s = &slot[slot_num];
 863                 if (s->format < 0)
 864                         continue;
 865                 /* check read time */
 866                 if (s->receiver_node &&
 867                         now.tv_sec > s->rtime.tv_sec + timeout) {
 868                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 869                                 audio_formats[s->format], slot_num);
 870                         if (s->fci)
 871                                 s->fci->error = 42;
 872                         else
 873                                 close_receiver(slot_num);
 874                 }
 875                 /* check write time */
 876                 if (s->wpid > 0 && !s->wkilled &&
 877                         now.tv_sec > s->wtime.tv_sec + timeout) {
 878                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 879                                 audio_formats[s->format], slot_num);
 880                         if (s->fci)
 881                                 s->fci->error = 42;
 882                 }
 883         }
 884 }
 885
 886 static size_t get_loaded_bytes(int slot_num)
 887 {
 888         size_t loaded = 0;
 889         struct slot_info *s = &slot[slot_num];
 890         struct receiver_node *rn = s->receiver_node;
 891
 892         if (s->format < 0)
 893                 goto out;
 894
 895         if (afi[s->format].num_filters) {
 896                 if (s->fci)
 897                         loaded = *s->fci->out_loaded;
 898         } else {
 899                 if (rn)
 900                         loaded = rn->loaded;
 901         }
 902 out:
 903         return loaded;
 904 }
 905
 906
 907 static void close_decoder_if_idle(int slot_num)
 908 {
 909         struct slot_info *s = &slot[slot_num];
 910         struct receiver_node *rn = s->receiver_node;
 911
 912         if (s->format < 0)
 913                 return;
 914         if (!s->fci)
 915                 return;
 916         if (!rn->eof && !s->fci->error && s->wpid > 0)
 917                 return;
 918         if (!s->fci->error && s->wpid > 0) { /* eof */
 919                 if (filter_io(s->fci) > 0)
 920                         return;
 921                 if (get_loaded_bytes(slot_num))
 922                         return;
 923         }
 924         if (s->write_fd > 0) {
 925                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 926                         s->write_fd);
 927                 close(s->write_fd);
 928                 del_close_on_fork_list(s->write_fd);
 929                 s->write_fd = -1;
 930         }
 931         if (s->wpid > 0)
 932                 return; /* wait until writer dies before closing filters */
 933         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 934                 slot_num, s->fci);
 935         close_filters(s->fci);
 936         free(s->fci);
 937         close_receiver(slot_num);
 938         clear_slot(slot_num);
 939 }
 940
 941 static int set_stream_fds(fd_set *wfds)
 942 {
 943         int i, max_fileno = -1;
 944
 945         check_timeouts();
 946         FOR_EACH_SLOT(i) {
 947                 struct slot_info *s = &slot[i];
 948                 struct audio_format_info *a;
 949                 struct receiver_node *rn;
 950
 951                 close_decoder_if_idle(i);
 952                 s->wcheck = 0;
 953                 if (s->format < 0)
 954                         continue;
 955                 a = &afi[s->format];
 956                 rn = s->receiver_node;
 957                 if (rn && rn->loaded && !s->wpid) {
 958                         PARA_INFO_LOG("no writer in slot %d\n", i);
 959                         start_stream_writer(i);
 960                 }
 961                 if (s->write_fd <= 0)
 962                         continue;
 963                 if (!get_loaded_bytes(i))
 964                         continue;
 965                 FD_SET(s->write_fd, wfds);
 966                 s->wcheck = 1;
 967                 max_fileno = MAX(s->write_fd, max_fileno);
 968         }
 969 //      PARA_INFO_LOG("return %d\n", max_fileno);
 970         return max_fileno;
 971 }
 972
 973 static int write_audio_data(int slot_num)
 974 {
 975         struct slot_info *s = &slot[slot_num];
 976         struct audio_format_info *a = &afi[s->format];
 977         struct receiver_node *rn = s->receiver_node;
 978         int rv;
 979         char **buf;
 980         size_t *len;
 981
 982         if (a->num_filters) {
 983                 buf = &s->fci->outbuf;
 984                 len = s->fci->out_loaded;
 985         } else {
 986                 buf = &rn->buf;
 987                 len = &rn->loaded;
 988         }
 989         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
 990         rv = write(s->write_fd, *buf, *len);
 991         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
 992         if (rv < 0) {
 993                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
 994                         slot_num, s->write_fd, strerror(errno));
 995                 *len = 0;
 996                 s->fci->error = E_WRITE_AUDIO_DATA;
 997         } else if (rv != *len) {
 998                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
 999                         audio_formats[s->format], rv, *len, slot_num);
1000                 *len -= rv;
1001                 memmove(*buf, *buf + rv, *len);
1002         } else
1003                 *len = 0;
1004         if (rv > 0)
1005                 gettimeofday(&s->wtime, NULL);
1006         return rv;
1007 }
1008
1009 static void slot_io(fd_set *wfds)
1010 {
1011         int ret, i;
1012
1013         FOR_EACH_SLOT(i) {
1014                 struct slot_info *s = &slot[i];
1015                 struct receiver_node *rn = s->receiver_node;
1016
1017                 if (rn && rn->loaded)
1018                         gettimeofday(&s->rtime, NULL);
1019                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1020                         ret = filter_io(s->fci);
1021                         if (ret < 0)
1022                                 s->fci->error = -ret;
1023 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1024 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1025                 }
1026                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1027                         continue;
1028                 write_audio_data(i);
1029         }
1030 }
1031
1032 static int parse_stream_command(const char *txt, char **cmd)
1033 {
1034         char *p = strchr(txt, ':');
1035         int i;
1036
1037         if (!p)
1038                 return -E_MISSING_COLON;
1039         p++;
1040         FOR_EACH_AUDIO_FORMAT(i) {
1041                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1042                         continue;
1043                 *cmd = p;
1044                 return i;
1045         }
1046         return -E_UNSUPPORTED_AUDIO_FORMAT;
1047 }
1048
1049 static int add_filter(int format, char *cmdline)
1050 {
1051         struct audio_format_info *a = &afi[format];
1052         int filter_num, nf = a->num_filters;
1053
1054         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1055         if (filter_num < 0)
1056                 return filter_num;
1057         a->filters[nf] = &filters[filter_num];
1058         a->num_filters++;
1059         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1060                 a->filters[nf]->name);
1061         return filter_num;
1062 }
1063
1064 static int setup_default_filters(void)
1065 {
1066         int i, ret = 1;
1067
1068         FOR_EACH_AUDIO_FORMAT(i) {
1069                 struct audio_format_info *a = &afi[i];
1070                 char *tmp;
1071                 int j;
1072                 if (a->num_filters)
1073                         continue;
1074                 /* add "dec" to audio format name */
1075                 tmp = make_message("%sdec", audio_formats[i]);
1076                 for (j = 0; filters[j].name; j++)
1077                         if (!strcmp(tmp, filters[j].name))
1078                                 break;
1079                 free(tmp);
1080                 ret = -E_UNSUPPORTED_FILTER;
1081                 if (!filters[j].name)
1082                         goto out;
1083                 tmp = para_strdup(filters[j].name);
1084                 ret = add_filter(i, tmp);
1085                 free(tmp);
1086                 if (ret < 0)
1087                         goto out;
1088                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1089                 ret = add_filter(i, "wav");
1090                 if (ret < 0)
1091                         goto out;
1092                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1093         }
1094 out:
1095         return ret;
1096 }
1097
1098 static int init_stream_io(void)
1099 {
1100         int i, ret, receiver_num;
1101         char *cmd;
1102
1103         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1104                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1105                 if (ret < 0)
1106                         goto out;
1107                 afi[ret].write_cmd = para_strdup(cmd);
1108                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1109         }
1110         for (i = 0; receivers[i].name; i++) {
1111                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1112                 receivers[i].init(&receivers[i]);
1113         }
1114         for (i = 0; i < conf.receiver_given; i++) {
1115                 char *arg = conf.receiver_arg[i];
1116                 char *recv = strchr(arg, ':');
1117                 ret = -E_MISSING_COLON;
1118                 if (!recv)
1119                         goto out;
1120                 *recv = '\0';
1121                 recv++;
1122                 ret = get_audio_format_num(arg);
1123                 if (ret < 0)
1124                         goto out;
1125                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1126                 if (!afi[ret].receiver_conf) {
1127                         ret = -E_RECV_SYNTAX;
1128                         goto out;
1129                 }
1130                 afi[ret].receiver = &receivers[receiver_num];
1131         }
1132         /* use the first available receiver with no arguments
1133          * for those audio formats for which no receiver
1134          * was specified
1135          */
1136         cmd = para_strdup(receivers[0].name);
1137         FOR_EACH_AUDIO_FORMAT(i) {
1138                 struct audio_format_info *a = &afi[i];
1139                 if (a->receiver_conf)
1140                         continue;
1141                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1142                 if (!a->receiver_conf)
1143                         return -E_RECV_SYNTAX;
1144                 a->receiver = &receivers[receiver_num];
1145         }
1146         free(cmd);
1147         /* filters */
1148         filter_init(filters);
1149         FOR_EACH_AUDIO_FORMAT(i) {
1150                 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1151                 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1152         }
1153         if (!conf.no_default_filters_given)
1154                 return setup_default_filters();
1155         for (i = 0; i < conf.filter_given; i++) {
1156                 char *arg = conf.filter_arg[i];
1157                 char *filter_name = strchr(arg, ':');
1158                 ret = -E_MISSING_COLON;
1159                 if (!filter_name)
1160                         goto out;
1161                 *filter_name = '\0';
1162                 filter_name++;
1163                 ret = get_audio_format_num(arg);
1164                 if (ret < 0)
1165                         goto out;
1166                 ret = add_filter(ret, filter_name);
1167                 if (ret < 0)
1168                         goto out;
1169         }
1170         ret = 1;
1171 out:
1172         return ret;
1173 }
1174
1175 static int dump_commands(int fd)
1176 {
1177         char *buf = para_strdup(""), *tmp = NULL;
1178         int i;
1179         ssize_t ret;
1180
1181         FOR_EACH_COMMAND(i) {
1182                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1183                         cmds[i].description);
1184                 free(buf);
1185                 buf = tmp;
1186         }
1187         ret = client_write(fd, buf);
1188         free(buf);
1189         return ret;
1190 }
1191
1192 /*
1193  * command handlers don't close their fd on errors (ret < 0) so that
1194  * its caller can send an error message. Otherwise (ret >= 0) it's up
1195  * to each individual command to close the fd if necessary.
1196  */
1197
1198 static int com_help(int fd, int argc, char **argv)
1199 {
1200         int i, ret;
1201         char *buf;
1202         const char *dflt = "No such command. Available commands:\n";
1203
1204         if (argc < 2) {
1205                 ret = dump_commands(fd);
1206                 goto out;
1207         }
1208         FOR_EACH_COMMAND(i) {
1209                 if (strcmp(cmds[i].name, argv[1]))
1210                         continue;
1211                 buf = make_message(
1212                         "NAME\n\t%s -- %s\n"
1213                         "SYNOPSIS\n\tpara_audioc %s\n"
1214                         "DESCRIPTION\n%s\n",
1215                         argv[1],
1216                         cmds[i].description,
1217                         cmds[i].synopsis,
1218                         cmds[i].help
1219                 );
1220                 ret = client_write(fd, buf);
1221                 free(buf);
1222                 goto out;
1223         }
1224         ret = client_write(fd, dflt);
1225         if (ret > 0)
1226                 ret = dump_commands(fd);
1227 out:
1228         if (ret >= 0)
1229                 close(fd);
1230         return ret;
1231 }
1232
1233 static int com_stat(int fd, __unused int argc, __unused char **argv)
1234 {
1235         int i, ret;
1236         char *buf = audiod_status_string();
1237
1238         buf = para_strcat(buf, "\n");
1239         for (i = RINGBUFFER_SIZE - 1; i >= 0; i--) {
1240                 char *tmp, *line = ringbuffer_get(stat_item_ringbuf, i);
1241                 if (!line)
1242                         continue;
1243                 tmp = make_message("%s\n", line);
1244                 buf = para_strcat(buf, tmp);
1245                 free(tmp);
1246         }
1247         ret = client_write(fd, buf);
1248         if (ret > 0)
1249                 ret = stat_client_add(fd);
1250         free(buf);
1251         return ret;
1252 }
1253
1254 #if 0
1255 static char *list_filters(void)
1256 {
1257         int i, j;
1258         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1259
1260         FOR_EACH_AUDIO_FORMAT(i) {
1261                 for (j = 0; j < afi[i].num_filters; j++) {
1262                         tmp = make_message("%s\t%i\t%s\n",
1263                                 afi[i].name, j, afi[i].filter_cmds[j]);
1264                         msg = para_strcat(msg, tmp);
1265                         free(tmp);
1266                 }
1267                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1268                         j, afi[i].write_cmd);
1269                 msg = para_strcat(msg, tmp);
1270                 free(tmp);
1271         }
1272         return msg;
1273 }
1274 #endif
1275
1276 static int com_grab(int fd, int argc, char **argv)
1277 {
1278         struct grab_client *gc;
1279         struct filter_node *fn;
1280         int err;
1281
1282         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1283         gc = grab_client_new(fd, argc, argv, &err);
1284         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1285         if (!gc)
1286                 goto err_out;
1287         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1288         if (fn)
1289                 activate_grab_client(gc, fn);
1290         return 1;
1291 err_out:
1292         if (err != -E_GC_HELP_GIVEN)
1293                 return err;
1294         err = client_write(fd, "Usage: para_audioc [audioc_options] -- "
1295                 "grab [grab_options]\nAvailable options:\n");
1296         if (err < 0)
1297                 return err;
1298         err = client_write(fd, GRAB_HELP_TXT);
1299         if (err < 0)
1300                 return err;
1301         close(fd);
1302         return 1;
1303 }
1304
1305 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1306 {
1307         close(fd);
1308         clean_exit(EXIT_SUCCESS, "terminating on user request");
1309 }
1310
1311 static int com_on(int fd, __unused int argc, __unused char **argv)
1312 {
1313         audiod_status = AUDIOD_ON;
1314         close(fd);
1315         return 1;
1316 }
1317
1318 static int com_off(int fd, __unused int argc, __unused char **argv)
1319 {
1320         audiod_status = AUDIOD_OFF;
1321         close(fd);
1322         return 1;
1323 }
1324
1325 static int com_sb(int fd, __unused int argc, __unused char **argv)
1326 {
1327         audiod_status = AUDIOD_STANDBY;
1328         close(fd);
1329         return 1;
1330 }
1331
1332 static int com_cycle(int fd, int argc, char **argv)
1333 {
1334         switch (audiod_status) {
1335                 case  AUDIOD_ON:
1336                         return com_sb(fd, argc, argv);
1337                         break;
1338                 case  AUDIOD_OFF:
1339                         return com_on(fd, argc, argv);
1340                         break;
1341                 case  AUDIOD_STANDBY:
1342                         return com_off(fd, argc, argv);
1343                         break;
1344         }
1345         close(fd);
1346         return 1;
1347 }
1348
1349 static int check_perms(struct ucred *c)
1350 {
1351         int i;
1352
1353         if (!conf.user_allow_given)
1354                 return 1;
1355         for (i = 0; i < conf.user_allow_given; i++)
1356                 if (c->uid == conf.user_allow_arg[i])
1357                         return 1;
1358         return -E_UCRED_PERM;
1359 }
1360
1361 static int handle_connect(void)
1362 {
1363         int i, argc, ret, clifd = -1;
1364         struct ucred c;
1365         char *buf = para_malloc(MAXLINE), **argv = NULL;
1366         struct sockaddr_un unix_addr;
1367
1368         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1369         if (ret < 0)
1370                 goto out;
1371         clifd = ret;
1372         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1373         if (ret < 0)
1374                 goto out;
1375         PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1376         buf[ret] = '\0';
1377         ret = check_perms(&c);
1378         if (ret < 0)
1379                 goto out;
1380         argc = split_args(buf, &argv, '\n');
1381         PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
1382         for (i = 0; cmds[i].name; i++) {
1383                 if (strcmp(cmds[i].name, argv[0]))
1384                         continue;
1385                 ret = cmds[i].handler(clifd, argc + 1, argv);
1386                 goto out;
1387         }
1388         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1389 out:
1390         free(buf);
1391         free(argv);
1392         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1393                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1394                 client_write(clifd, tmp);
1395                 free(tmp);
1396                 close(clifd);
1397         }
1398         return ret;
1399 }
1400
1401 static void audiod_get_socket(void)
1402 {
1403         struct sockaddr_un unix_addr;
1404
1405         if (conf.socket_given)
1406                 socket_name = para_strdup(conf.socket_arg);
1407         else {
1408                 char *hn = para_hostname();
1409                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1410                         hn);
1411                 free(hn);
1412         }
1413         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1414         if (conf.force_given)
1415                 unlink(socket_name);
1416         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1417                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1418         if (audiod_socket < 0) {
1419                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1420                 exit(EXIT_FAILURE); /* do not unlink socket */
1421         }
1422         if (listen(audiod_socket, 5) < 0) {
1423                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1424                 exit(EXIT_FAILURE); /* do not unlink socket */
1425         }
1426         add_close_on_fork_list(audiod_socket);
1427 }
1428
1429 static int open_stat_pipe(void)
1430 {
1431         int ret, fd[3] = {-1, 1, 0};
1432         char *argv[] = {BINDIR "/para_client", "stat", NULL};
1433         pid_t pid;
1434         ret = para_exec(&pid, BINDIR "/para_client",  argv, fd);
1435         if (ret >= 0) {
1436                 ret = fd[1];
1437                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1438                 add_close_on_fork_list(ret);
1439         } else
1440                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1441         return ret;
1442 }
1443
1444 static int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
1445 {
1446         int i, ret, max = -1;
1447
1448         FOR_EACH_SLOT(i) {
1449                 struct slot_info *s = &slot[i];
1450                 struct audio_format_info *a;
1451                 struct receiver_node *rn = s->receiver_node;
1452                 if (s->format < 0 || !rn)
1453                         continue;
1454                 a = &afi[s->format];
1455                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1456 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1457                 max = MAX(max, ret);
1458         }
1459         return max;
1460
1461 }
1462 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1463 {
1464         int i, ret;
1465
1466         FOR_EACH_SLOT(i) {
1467                 struct slot_info *s = &slot[i];
1468                 struct audio_format_info *a;
1469                 struct receiver_node *rn = s->receiver_node;
1470                 if (s->format < 0 || !rn || rn->eof)
1471                         continue;
1472                 a = &afi[s->format];
1473                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1474                 if (ret <= 0) {
1475                         if (ret)
1476                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1477                                 a->receiver->name, PARA_STRERROR(-ret), i);
1478                         else
1479                                 PARA_INFO_LOG("eof in slot %d\n", i);
1480                         rn->eof = 1;
1481                 }
1482                 if (ret < 0 && s->fci)
1483                         s->fci->error = ret;
1484         }
1485 }
1486
1487 /* TODO: move everything before the select call to pre_select() */
1488 static void __noreturn audiod_mainloop(void)
1489 {
1490         fd_set rfds, wfds;
1491         int ret, max_fileno, sbo = 0;
1492         char status_buf[STRINGSIZE] = "";
1493         struct timeval tv;
1494 repeat:
1495         FD_ZERO(&rfds);
1496         FD_ZERO(&wfds);
1497         max_fileno = 0;
1498         if (audiod_status != AUDIOD_ON)
1499                 kill_all_decoders();
1500         else if (playing)
1501                 start_current_receiver();
1502         max_fileno = set_stream_fds(&wfds);
1503         /* stat pipe (read) */
1504         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1505                 close_stat_pipe();
1506         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1507                 stat_pipe = open_stat_pipe();
1508                 sbo = 0;
1509                 status_buf[0] = '\0';
1510         }
1511         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
1512                 FD_SET(stat_pipe, &rfds);
1513                 max_fileno = MAX(max_fileno, stat_pipe);
1514         }
1515         /* always check signal pipe */
1516         FD_SET(signal_pipe, &rfds);
1517         max_fileno = MAX(max_fileno, signal_pipe);
1518         /* local socket */
1519         if (audiod_socket < 0)
1520                 audiod_get_socket(); /* doesn't return on errors */
1521         FD_SET(audiod_socket, &rfds);
1522         max_fileno = MAX(max_fileno, audiod_socket);
1523         tv.tv_sec = 0;
1524         tv.tv_usec = 200 * 1000;
1525         ret = pre_select(&rfds, &wfds, &tv);
1526         max_fileno = MAX(max_fileno, ret);
1527         ret = select(max_fileno + 1, &rfds, &wfds, NULL, &tv);
1528         if (ret < 0 && errno != EINTR)
1529                 PARA_ERROR_LOG("select returned %d (%s)\n", ret,
1530                         strerror(errno));
1531         if (audiod_status != AUDIOD_OFF)
1532                 audiod_status_dump();
1533         if (ret < 0)
1534                 goto repeat;
1535         audiod_post_select(ret, &rfds, &wfds);
1536         /* read status pipe */
1537         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1538                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1539                 if (ret <= 0) {
1540                         close_stat_pipe();
1541                         /* avoid busy loop if server is down */
1542                         while (sleep(1) > 0)
1543                                 ; /* try again*/
1544                 } else {
1545                         status_buf[ret + sbo] = '\0';
1546                         sbo = for_each_line(status_buf, ret + sbo,
1547                                 &check_stat_line);
1548                 }
1549         }
1550         slot_io(&wfds);
1551         if (FD_ISSET(audiod_socket, &rfds)) {
1552                 ret = handle_connect();
1553                 if (ret < 0) {
1554                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1555                 }
1556         }
1557         /* signals */
1558         if (FD_ISSET(signal_pipe, &rfds)) {
1559                 int sig_nr = para_next_signal();
1560                 if (sig_nr > 0)
1561                         handle_signal(sig_nr);
1562         }
1563         goto repeat;
1564 }
1565
1566 static void set_initial_status(void)
1567 {
1568         audiod_status = AUDIOD_ON;
1569         if (!conf.mode_given)
1570                 return;
1571         if (!strcmp(conf.mode_arg, "sb")) {
1572                 audiod_status = AUDIOD_STANDBY;
1573                 return;
1574         }
1575         if (!strcmp(conf.mode_arg, "off")) {
1576                 audiod_status = AUDIOD_OFF;
1577                 return;
1578         }
1579         if (strcmp(conf.mode_arg, "on"))
1580                 PARA_WARNING_LOG("%s", "invalid mode\n");
1581 }
1582
1583 int __noreturn main(int argc, char *argv[])
1584 {
1585         char *cf;
1586         int i;
1587
1588         valid_fd_012();
1589         hostname = para_hostname();
1590         cmdline_parser(argc, argv, &conf);
1591         para_drop_privileges(conf.user_arg);
1592         cf = configfile_exists();
1593         if (cf) {
1594                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1595                         fprintf(stderr, "parse error in config file\n");
1596                         exit(EXIT_FAILURE);
1597                 }
1598         }
1599         log_welcome("para_audiod", conf.loglevel_arg);
1600         i = init_stream_io();
1601         if (i < 0) {
1602                 fprintf(stderr, "init stream io error: %s\n",
1603                         PARA_STRERROR(-i));
1604                 exit(EXIT_FAILURE);
1605         }
1606         server_uptime(UPTIME_SET);
1607         set_initial_status();
1608         FOR_EACH_SLOT(i)
1609                 clear_slot(i);
1610         stat_item_ringbuf = ringbuffer_new(RINGBUFFER_SIZE);
1611         init_grabbing();
1612         setup_signal_handling();
1613         if (conf.daemon_given)
1614                 daemon_init();
1615         audiod_mainloop();
1616 }