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 set_restart_barrier(int format, struct timeval *now)
 452 {
 453         struct timeval tmp;
 454
 455         if (now)
 456                 tmp = *now;
 457         else
 458                 gettimeofday(&tmp, NULL);
 459         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 460 }
 461
 462 static void close_receiver(int slot_num)
 463 {
 464         struct slot_info *s = &slot[slot_num];
 465         struct audio_format_info *a;
 466         struct timeval now;
 467
 468         if (s->format < 0 || !s->receiver_node)
 469                 return;
 470         a = &afi[s->format];
 471         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 472                 audio_formats[s->format] , slot_num);
 473         a->receiver->close(s->receiver_node);
 474         free(s->receiver_node);
 475         s->receiver_node = NULL;
 476         set_restart_barrier(s->format, NULL);
 477 }
 478
 479 static void kill_all_decoders(void)
 480 {
 481         int i;
 482
 483         FOR_EACH_SLOT(i)
 484                 if (slot[i].format >= 0) {
 485                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 486                         kill_stream_writer(i);
 487                 }
 488 }
 489
 490 static void check_sigchld(void)
 491 {
 492         pid_t pid;
 493         int i;
 494         struct timeval now;
 495         gettimeofday(&now, NULL);
 496
 497 reap_next_child:
 498         pid = para_reap_child();
 499         if (pid <= 0)
 500                 return;
 501         FOR_EACH_SLOT(i) {
 502                 struct slot_info *s = &slot[i];
 503                 long lifetime;
 504                 if (s->format < 0)
 505                         continue;
 506                 if (pid == s->wpid) {
 507                         s->wpid = -1;
 508                         lifetime = now.tv_sec - s->wstime.tv_sec;
 509                         PARA_INFO_LOG("%s stream writer in slot %d died "
 510                                 "after %li secs\n",
 511                                 audio_formats[s->format], i, lifetime);
 512                         set_restart_barrier(s->format, &now);
 513                         goto reap_next_child;
 514                 }
 515         }
 516         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 517         goto reap_next_child;
 518 }
 519
 520 static int get_empty_slot(void)
 521 {
 522         int i;
 523         struct slot_info *s;
 524
 525         FOR_EACH_SLOT(i) {
 526                 s = &slot[i];
 527                 if (s->format < 0) {
 528                         clear_slot(i);
 529                         return i;
 530                 }
 531                 if (s->write_fd > 0 || s->wpid > 0)
 532                         continue;
 533                 if (s->receiver_node)
 534                         continue;
 535                 if (s->fci)
 536                         continue;
 537                 clear_slot(i);
 538                 return i;
 539         }
 540         return -E_NO_MORE_SLOTS;
 541 }
 542
 543 static int decoder_running(int format)
 544 {
 545         int i, ret = 0;
 546         struct slot_info *s;
 547
 548         FOR_EACH_SLOT(i) {
 549                 s = &slot[i];
 550                 if (s->format == format && s->receiver_node)
 551                         ret |= 1;
 552                 if (s->format == format && s->wpid > 0)
 553                         ret |= 2;
 554         }
 555         return ret;
 556 }
 557
 558 static void close_stat_pipe(void)
 559 {
 560         char *msg;
 561         int i;
 562
 563         if (stat_pipe < 0)
 564                 return;
 565         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 566         close(stat_pipe);
 567         del_close_on_fork_list(stat_pipe);
 568         stat_pipe = -1;
 569         kill_all_decoders();
 570         for (i = 0; i < RINGBUFFER_SIZE; i++)
 571                 free(ringbuffer_add(stat_item_ringbuf, para_strdup(NULL)));
 572         dump_empty_status();
 573         length_seconds = 0;
 574         offset_seconds = 0;
 575         audiod_status_dump();
 576         playing = 0;
 577         msg = make_message("%s:no connection to para_server\n",
 578                 status_item_list[SI_STATUS_BAR]);
 579         free(ringbuffer_add(stat_item_ringbuf, msg));
 580         stat_client_write(msg);
 581 }
 582
 583 static void __noreturn clean_exit(int status, const char *msg)
 584 {
 585         PARA_EMERG_LOG("%s\n", msg);
 586         kill_all_decoders();
 587         if (socket_name)
 588                 unlink(socket_name);
 589         if (stat_pipe >= 0)
 590                 close_stat_pipe();
 591         exit(status);
 592 }
 593
 594 static char *glob_cmd(char *cmd)
 595 {
 596         char *ret, *replacement;
 597         struct timeval tmp, delay, rss; /* real stream start */
 598
 599         delay.tv_sec = conf.stream_delay_arg / 1000;
 600         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 601 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 602         if (sa_time_diff_sign < 0)
 603                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 604         else
 605                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 606         tv_add(&rss, &delay, &tmp);
 607         replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
 608         ret = s_a_r(cmd, "STREAM_START", replacement);
 609         free(replacement);
 610         if (!ret)
 611                 goto out;
 612         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 613         {
 614         struct timeval now;
 615         gettimeofday(&now, NULL);
 616         PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
 617         }
 618 out:
 619         return ret;
 620 }
 621
 622 /** get the number of filters for the given audio format */
 623 int num_filters(int audio_format_num)
 624 {
 625         return afi[audio_format_num].num_filters;
 626 }
 627
 628 static void open_filters(int slot_num)
 629 {
 630         struct slot_info *s = &slot[slot_num];
 631         struct audio_format_info *a = &afi[s->format];
 632         int nf = a->num_filters;
 633         int i;
 634
 635         s->fci = para_calloc(sizeof(struct filter_chain_info));
 636         INIT_LIST_HEAD(&s->fci->filters);
 637         if (!nf)
 638                 return;
 639         s->fci->inbuf = s->receiver_node->buf;
 640         s->fci->in_loaded = &s->receiver_node->loaded;
 641         s->fci->outbuf = s->receiver_node->buf;
 642         s->fci->out_loaded = &s->receiver_node->loaded;
 643         s->fci->eof = &s->receiver_node->eof;
 644         for (i = 0; i < nf; i++) {
 645                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 646                 fn->conf = a->filter_conf[i];
 647                 fn->fci = s->fci;
 648                 fn->filter = a->filters[i];
 649                 INIT_LIST_HEAD(&fn->callbacks);
 650                 list_add_tail(&fn->node, &s->fci->filters);
 651                 fn->filter->open(fn);
 652                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 653                         audio_formats[s->format], i + 1,  nf,
 654                         fn->filter->name, slot_num);
 655                 s->fci->outbuf = fn->buf;
 656                 s->fci->out_loaded = &fn->loaded;
 657         }
 658         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 659                 s->fci->outbuf);
 660 }
 661
 662 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 663 {
 664         struct filter_node *fn;
 665         int i, j;
 666
 667         FOR_EACH_SLOT(i) {
 668                 struct slot_info *s = &slot[i];
 669                 if (s->format < 0 || !s->fci)
 670                         continue;
 671                 if (slot_num >= 0 && slot_num != i)
 672                         continue;
 673                 if (format >= 0 && s->format != format)
 674                         continue;
 675                 if (num_filters(i) < filternum)
 676                         continue;
 677                 /* success */
 678                 j = 1;
 679                 list_for_each_entry(fn, &s->fci->filters, node)
 680                         if (filternum <= 0 || j++ == filternum)
 681                                 break;
 682                 return fn;
 683         }
 684         return NULL;
 685 }
 686
 687 static void start_stream_writer(int slot_num)
 688 {
 689         int ret, fds[3] = {1, -1, -1};
 690         struct slot_info *s = &slot[slot_num];
 691         struct audio_format_info *a = &afi[s->format];
 692         char *glob = glob_cmd(a->write_cmd);
 693
 694         PARA_INFO_LOG("starting stream writer: %s\n", glob? glob : a->write_cmd);
 695         open_filters(slot_num);
 696
 697         ret = para_exec_cmdline_pid(&s->wpid, glob? glob : a->write_cmd, fds);
 698         free(glob);
 699         if (ret < 0) {
 700                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 701                 return;
 702         }
 703         s->write_fd = fds[0];
 704         add_close_on_fork_list(s->write_fd);
 705         /* we write to this fd in do_select, so we need non-blocking */
 706         fcntl(s->write_fd, F_SETFL, O_NONBLOCK);
 707         gettimeofday(&s->wstime, NULL);
 708         current_decoder = slot_num;
 709         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 710 }
 711
 712 static void open_receiver(int format)
 713 {
 714         struct audio_format_info *a = &afi[format];
 715         struct slot_info *s;
 716         int ret, slot_num;
 717
 718         slot_num = get_empty_slot();
 719         if (slot_num < 0)
 720                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 721         s = &slot[slot_num];
 722         s->format = format;
 723         gettimeofday(&s->rtime, NULL);
 724         s->wtime = s->rtime;
 725         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 726         s->receiver_node->conf = a->receiver_conf;
 727         ret = a->receiver->open(s->receiver_node);
 728         if (ret < 0) {
 729                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 730                         PARA_STRERROR(-ret));
 731                 free(s->receiver_node);
 732                 s->receiver_node = NULL;
 733                 return;
 734         }
 735         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 736                 audio_formats[s->format], a->receiver->name, slot_num);
 737 }
 738
 739 static int is_frozen(int format)
 740 {
 741         struct timeval now;
 742         struct audio_format_info *a = &afi[format];
 743
 744         gettimeofday(&now, NULL);
 745         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 746 }
 747
 748 static void start_current_receiver(void)
 749 {
 750         int i;
 751
 752         if (!af_status)
 753                 return;
 754         i = get_audio_format_num(af_status);
 755         if (i < 0)
 756                 return;
 757         if ((decoder_running(i) & 1) || is_frozen(i))
 758                 return;
 759         open_receiver(i);
 760 }
 761
 762 static void compute_time_diff(const struct timeval *status_time)
 763 {
 764         struct timeval now, tmp, diff;
 765         static int count;
 766         int sign;
 767         const struct timeval max_deviation = {0, 500 * 1000};
 768         const int time_smooth = 5;
 769
 770         gettimeofday(&now, NULL);
 771         sign = tv_diff(status_time, &now, &diff);
 772 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 773 //                      sign, sa_time_diff_sign);
 774         if (!count) {
 775                 sa_time_diff_sign = sign;
 776                 sa_time_diff = diff;
 777                 count++;
 778                 return;
 779         }
 780         if (count > 5) {
 781                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 782                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 783                         PARA_WARNING_LOG("time diff jump: %lims\n",
 784                                 s * tv2ms(&tmp));
 785         }
 786         count++;
 787         sa_time_diff_sign = tv_convex_combination(
 788                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 789                 count > 10? sign : sign * time_smooth, &diff,
 790                 &tmp);
 791         sa_time_diff = tmp;
 792         PARA_INFO_LOG("time diff (cur/avg): "
 793                 "%li:%lu/%li:%lu\n",
 794                 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
 795                 sa_time_diff_sign * sa_time_diff.tv_sec,
 796                 (sa_time_diff.tv_usec + 500)/ 1000);
 797 }
 798
 799 static void check_stat_line(char *line)
 800 {
 801         int itemnum;
 802         size_t ilen = 0;
 803         struct timeval tv;
 804
 805         if (!line)
 806                 return;
 807         free(ringbuffer_add(stat_item_ringbuf, para_strdup(line)));
 808         stat_client_write(line);
 809         itemnum = stat_line_valid(line);
 810         if (itemnum < 0)
 811                 return;
 812         ilen = strlen(status_item_list[itemnum]);
 813         switch (itemnum) {
 814         case SI_STATUS:
 815                 playing = strstr(line, "playing")? 1 : 0;
 816                 break;
 817         case SI_FORMAT:
 818                 free(af_status);
 819                 af_status = para_strdup(line + ilen + 1);
 820                 break;
 821         case SI_OFFSET:
 822                 offset_seconds = atoi(line + ilen + 1);
 823                 break;
 824         case SI_LENGTH:
 825                 length_seconds = atoi(line + ilen + 1);
 826                 break;
 827         case SI_STREAM_START:
 828                 if (sscanf(line + ilen + 1, "%lu.%lu",
 829                                 &tv.tv_sec, &tv.tv_usec) == 2)
 830                         server_stream_start = tv;
 831                 break;
 832         case SI_CURRENT_TIME:
 833                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 834                                 &tv.tv_usec) == 2)
 835                         compute_time_diff(&tv);
 836                 break;
 837         }
 838 }
 839
 840 static void handle_signal(int sig)
 841 {
 842         switch (sig) {
 843         case SIGCHLD:
 844                 return check_sigchld();
 845         case SIGINT:
 846         case SIGTERM:
 847         case SIGHUP:
 848                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 849                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 850                 return;
 851         }
 852 }
 853
 854 static void check_timeouts(void)
 855 {
 856         struct timeval now;
 857         int slot_num, timeout = conf.stream_timeout_arg;
 858
 859         gettimeofday(&now, NULL);
 860         FOR_EACH_SLOT(slot_num) {
 861                 struct slot_info *s = &slot[slot_num];
 862                 if (s->format < 0)
 863                         continue;
 864                 /* check read time */
 865                 if (s->receiver_node &&
 866                         now.tv_sec > s->rtime.tv_sec + timeout) {
 867                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 868                                 audio_formats[s->format], slot_num);
 869                         if (s->fci)
 870                                 s->fci->error = 42;
 871                         else
 872                                 close_receiver(slot_num);
 873                 }
 874                 /* check write time */
 875                 if (s->wpid > 0 && !s->wkilled &&
 876                         now.tv_sec > s->wtime.tv_sec + timeout) {
 877                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 878                                 audio_formats[s->format], slot_num);
 879                         if (s->fci)
 880                                 s->fci->error = 42;
 881                 }
 882         }
 883 }
 884
 885 static size_t get_loaded_bytes(int slot_num)
 886 {
 887         size_t loaded = 0;
 888         struct slot_info *s = &slot[slot_num];
 889         struct receiver_node *rn = s->receiver_node;
 890
 891         if (s->format < 0)
 892                 goto out;
 893
 894         if (afi[s->format].num_filters) {
 895                 if (s->fci)
 896                         loaded = *s->fci->out_loaded;
 897         } else {
 898                 if (rn)
 899                         loaded = rn->loaded;
 900         }
 901 out:
 902         return loaded;
 903 }
 904
 905
 906 static void close_decoder_if_idle(int slot_num)
 907 {
 908         struct slot_info *s = &slot[slot_num];
 909         struct receiver_node *rn = s->receiver_node;
 910
 911         if (s->format < 0)
 912                 return;
 913         if (!s->fci)
 914                 return;
 915         if (!rn->eof && !s->fci->error && s->wpid > 0)
 916                 return;
 917         if (!s->fci->error && s->wpid > 0) { /* eof */
 918                 if (filter_io(s->fci) > 0)
 919                         return;
 920                 if (get_loaded_bytes(slot_num))
 921                         return;
 922         }
 923         if (s->write_fd > 0) {
 924                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 925                         s->write_fd);
 926                 close(s->write_fd);
 927                 del_close_on_fork_list(s->write_fd);
 928                 s->write_fd = -1;
 929         }
 930         if (s->wpid > 0)
 931                 return; /* wait until writer dies before closing filters */
 932         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 933                 slot_num, s->fci);
 934         close_filters(s->fci);
 935         free(s->fci);
 936         close_receiver(slot_num);
 937         clear_slot(slot_num);
 938 }
 939
 940 static int set_stream_fds(fd_set *wfds)
 941 {
 942         int i, max_fileno = -1;
 943
 944         check_timeouts();
 945         FOR_EACH_SLOT(i) {
 946                 struct slot_info *s = &slot[i];
 947                 struct audio_format_info *a;
 948                 struct receiver_node *rn;
 949
 950                 close_decoder_if_idle(i);
 951                 s->wcheck = 0;
 952                 if (s->format < 0)
 953                         continue;
 954                 a = &afi[s->format];
 955                 rn = s->receiver_node;
 956                 if (rn && rn->loaded && !s->wpid) {
 957                         PARA_INFO_LOG("no writer in slot %d\n", i);
 958                         start_stream_writer(i);
 959                 }
 960                 if (s->write_fd <= 0)
 961                         continue;
 962                 if (!get_loaded_bytes(i))
 963                         continue;
 964                 FD_SET(s->write_fd, wfds);
 965                 s->wcheck = 1;
 966                 max_fileno = MAX(s->write_fd, max_fileno);
 967         }
 968 //      PARA_INFO_LOG("return %d\n", max_fileno);
 969         return max_fileno;
 970 }
 971
 972 static int write_audio_data(int slot_num)
 973 {
 974         struct slot_info *s = &slot[slot_num];
 975         struct audio_format_info *a = &afi[s->format];
 976         struct receiver_node *rn = s->receiver_node;
 977         int rv;
 978         char **buf;
 979         size_t *len;
 980
 981         if (a->num_filters) {
 982                 buf = &s->fci->outbuf;
 983                 len = s->fci->out_loaded;
 984         } else {
 985                 buf = &rn->buf;
 986                 len = &rn->loaded;
 987         }
 988         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
 989         rv = write(s->write_fd, *buf, *len);
 990         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
 991         if (rv < 0) {
 992                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
 993                         slot_num, s->write_fd, strerror(errno));
 994                 *len = 0;
 995                 s->fci->error = E_WRITE_AUDIO_DATA;
 996         } else if (rv != *len) {
 997                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
 998                         audio_formats[s->format], rv, *len, slot_num);
 999                 *len -= rv;
1000                 memmove(*buf, *buf + rv, *len);
1001         } else
1002                 *len = 0;
1003         if (rv > 0)
1004                 gettimeofday(&s->wtime, NULL);
1005         return rv;
1006 }
1007
1008 static void slot_io(fd_set *wfds)
1009 {
1010         int ret, i;
1011
1012         FOR_EACH_SLOT(i) {
1013                 struct slot_info *s = &slot[i];
1014                 struct receiver_node *rn = s->receiver_node;
1015
1016                 if (rn && rn->loaded)
1017                         gettimeofday(&s->rtime, NULL);
1018                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1019                         ret = filter_io(s->fci);
1020                         if (ret < 0)
1021                                 s->fci->error = -ret;
1022 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1023 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1024                 }
1025                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1026                         continue;
1027                 write_audio_data(i);
1028         }
1029 }
1030
1031 static int parse_stream_command(const char *txt, char **cmd)
1032 {
1033         char *p = strchr(txt, ':');
1034         int i;
1035
1036         if (!p)
1037                 return -E_MISSING_COLON;
1038         p++;
1039         FOR_EACH_AUDIO_FORMAT(i) {
1040                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1041                         continue;
1042                 *cmd = p;
1043                 return i;
1044         }
1045         return -E_UNSUPPORTED_AUDIO_FORMAT;
1046 }
1047
1048 static int add_filter(int format, char *cmdline)
1049 {
1050         struct audio_format_info *a = &afi[format];
1051         int filter_num, nf = a->num_filters;
1052
1053         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1054         if (filter_num < 0)
1055                 return filter_num;
1056         a->filters[nf] = &filters[filter_num];
1057         a->num_filters++;
1058         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1059                 a->filters[nf]->name);
1060         return filter_num;
1061 }
1062
1063 static int setup_default_filters(void)
1064 {
1065         int i, ret = 1;
1066
1067         FOR_EACH_AUDIO_FORMAT(i) {
1068                 struct audio_format_info *a = &afi[i];
1069                 char *tmp;
1070                 int j;
1071                 if (a->num_filters)
1072                         continue;
1073                 /* add "dec" to audio format name */
1074                 tmp = make_message("%sdec", audio_formats[i]);
1075                 for (j = 0; filters[j].name; j++)
1076                         if (!strcmp(tmp, filters[j].name))
1077                                 break;
1078                 free(tmp);
1079                 ret = -E_UNSUPPORTED_FILTER;
1080                 if (!filters[j].name)
1081                         goto out;
1082                 tmp = para_strdup(filters[j].name);
1083                 ret = add_filter(i, tmp);
1084                 free(tmp);
1085                 if (ret < 0)
1086                         goto out;
1087                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1088                 ret = add_filter(i, "wav");
1089                 if (ret < 0)
1090                         goto out;
1091                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1092         }
1093 out:
1094         return ret;
1095 }
1096
1097 static int init_stream_io(void)
1098 {
1099         int i, ret, receiver_num;
1100         char *cmd;
1101
1102         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1103                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1104                 if (ret < 0)
1105                         goto out;
1106                 afi[ret].write_cmd = para_strdup(cmd);
1107                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1108         }
1109         for (i = 0; receivers[i].name; i++) {
1110                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1111                 receivers[i].init(&receivers[i]);
1112         }
1113         for (i = 0; i < conf.receiver_given; i++) {
1114                 char *arg = conf.receiver_arg[i];
1115                 char *recv = strchr(arg, ':');
1116                 ret = -E_MISSING_COLON;
1117                 if (!recv)
1118                         goto out;
1119                 *recv = '\0';
1120                 recv++;
1121                 ret = get_audio_format_num(arg);
1122                 if (ret < 0)
1123                         goto out;
1124                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1125                 if (!afi[ret].receiver_conf) {
1126                         ret = -E_RECV_SYNTAX;
1127                         goto out;
1128                 }
1129                 afi[ret].receiver = &receivers[receiver_num];
1130         }
1131         /* use the first available receiver with no arguments
1132          * for those audio formats for which no receiver
1133          * was specified
1134          */
1135         cmd = para_strdup(receivers[0].name);
1136         FOR_EACH_AUDIO_FORMAT(i) {
1137                 struct audio_format_info *a = &afi[i];
1138                 if (a->receiver_conf)
1139                         continue;
1140                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1141                 if (!a->receiver_conf)
1142                         return -E_RECV_SYNTAX;
1143                 a->receiver = &receivers[receiver_num];
1144         }
1145         free(cmd);
1146         /* filters */
1147         filter_init(filters);
1148         FOR_EACH_AUDIO_FORMAT(i) {
1149                 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1150                 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1151         }
1152         if (!conf.no_default_filters_given)
1153                 return setup_default_filters();
1154         for (i = 0; i < conf.filter_given; i++) {
1155                 char *arg = conf.filter_arg[i];
1156                 char *filter_name = strchr(arg, ':');
1157                 ret = -E_MISSING_COLON;
1158                 if (!filter_name)
1159                         goto out;
1160                 *filter_name = '\0';
1161                 filter_name++;
1162                 ret = get_audio_format_num(arg);
1163                 if (ret < 0)
1164                         goto out;
1165                 ret = add_filter(ret, filter_name);
1166                 if (ret < 0)
1167                         goto out;
1168         }
1169         ret = 1;
1170 out:
1171         return ret;
1172 }
1173
1174 static int dump_commands(int fd)
1175 {
1176         char *buf = para_strdup(""), *tmp = NULL;
1177         int i;
1178         ssize_t ret;
1179
1180         FOR_EACH_COMMAND(i) {
1181                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1182                         cmds[i].description);
1183                 free(buf);
1184                 buf = tmp;
1185         }
1186         ret = client_write(fd, buf);
1187         free(buf);
1188         return ret;
1189 }
1190
1191 /*
1192  * command handlers don't close their fd on errors (ret < 0) so that
1193  * its caller can send an error message. Otherwise (ret >= 0) it's up
1194  * to each individual command to close the fd if necessary.
1195  */
1196
1197 static int com_help(int fd, int argc, char **argv)
1198 {
1199         int i, ret;
1200         char *buf;
1201         const char *dflt = "No such command. Available commands:\n";
1202
1203         if (argc < 2) {
1204                 ret = dump_commands(fd);
1205                 goto out;
1206         }
1207         FOR_EACH_COMMAND(i) {
1208                 if (strcmp(cmds[i].name, argv[1]))
1209                         continue;
1210                 buf = make_message(
1211                         "NAME\n\t%s -- %s\n"
1212                         "SYNOPSIS\n\tpara_audioc %s\n"
1213                         "DESCRIPTION\n%s\n",
1214                         argv[1],
1215                         cmds[i].description,
1216                         cmds[i].synopsis,
1217                         cmds[i].help
1218                 );
1219                 ret = client_write(fd, buf);
1220                 free(buf);
1221                 goto out;
1222         }
1223         ret = client_write(fd, dflt);
1224         if (ret > 0)
1225                 ret = dump_commands(fd);
1226 out:
1227         if (ret >= 0)
1228                 close(fd);
1229         return ret;
1230 }
1231
1232 static int com_stat(int fd, __unused int argc, __unused char **argv)
1233 {
1234         int i, ret;
1235         char *buf = audiod_status_string();
1236
1237         buf = para_strcat(buf, "\n");
1238         for (i = RINGBUFFER_SIZE - 1; i >= 0; i--) {
1239                 char *tmp, *line = ringbuffer_get(stat_item_ringbuf, i);
1240                 if (!line)
1241                         continue;
1242                 tmp = make_message("%s\n", line);
1243                 buf = para_strcat(buf, tmp);
1244                 free(tmp);
1245         }
1246         ret = client_write(fd, buf);
1247         if (ret > 0)
1248                 ret = stat_client_add(fd);
1249         free(buf);
1250         return ret;
1251 }
1252
1253 #if 0
1254 static char *list_filters(void)
1255 {
1256         int i, j;
1257         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1258
1259         FOR_EACH_AUDIO_FORMAT(i) {
1260                 for (j = 0; j < afi[i].num_filters; j++) {
1261                         tmp = make_message("%s\t%i\t%s\n",
1262                                 afi[i].name, j, afi[i].filter_cmds[j]);
1263                         msg = para_strcat(msg, tmp);
1264                         free(tmp);
1265                 }
1266                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1267                         j, afi[i].write_cmd);
1268                 msg = para_strcat(msg, tmp);
1269                 free(tmp);
1270         }
1271         return msg;
1272 }
1273 #endif
1274
1275 static int com_grab(int fd, int argc, char **argv)
1276 {
1277         struct grab_client *gc;
1278         struct filter_node *fn;
1279         int err;
1280
1281         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1282         gc = grab_client_new(fd, argc, argv, &err);
1283         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1284         if (!gc)
1285                 goto err_out;
1286         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1287         if (fn)
1288                 activate_grab_client(gc, fn);
1289         return 1;
1290 err_out:
1291         if (err != -E_GC_HELP_GIVEN)
1292                 return err;
1293         err = client_write(fd, "Usage: para_audioc [audioc_options] -- "
1294                 "grab [grab_options]\nAvailable options:\n");
1295         if (err < 0)
1296                 return err;
1297         err = client_write(fd, GRAB_HELP_TXT);
1298         if (err < 0)
1299                 return err;
1300         close(fd);
1301         return 1;
1302 }
1303
1304 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1305 {
1306         close(fd);
1307         clean_exit(EXIT_SUCCESS, "terminating on user request");
1308 }
1309
1310 static int com_on(int fd, __unused int argc, __unused char **argv)
1311 {
1312         audiod_status = AUDIOD_ON;
1313         close(fd);
1314         return 1;
1315 }
1316
1317 static int com_off(int fd, __unused int argc, __unused char **argv)
1318 {
1319         audiod_status = AUDIOD_OFF;
1320         close(fd);
1321         return 1;
1322 }
1323
1324 static int com_sb(int fd, __unused int argc, __unused char **argv)
1325 {
1326         audiod_status = AUDIOD_STANDBY;
1327         close(fd);
1328         return 1;
1329 }
1330
1331 static int com_cycle(int fd, int argc, char **argv)
1332 {
1333         switch (audiod_status) {
1334                 case  AUDIOD_ON:
1335                         return com_sb(fd, argc, argv);
1336                         break;
1337                 case  AUDIOD_OFF:
1338                         return com_on(fd, argc, argv);
1339                         break;
1340                 case  AUDIOD_STANDBY:
1341                         return com_off(fd, argc, argv);
1342                         break;
1343         }
1344         close(fd);
1345         return 1;
1346 }
1347
1348 static int check_perms(struct ucred *c)
1349 {
1350         int i;
1351
1352         if (!conf.user_allow_given)
1353                 return 1;
1354         for (i = 0; i < conf.user_allow_given; i++)
1355                 if (c->uid == conf.user_allow_arg[i])
1356                         return 1;
1357         return -E_UCRED_PERM;
1358 }
1359
1360 static int handle_connect(void)
1361 {
1362         int i, argc, ret, clifd = -1;
1363         struct ucred c;
1364         char *buf = para_malloc(MAXLINE), **argv = NULL;
1365         struct sockaddr_un unix_addr;
1366
1367         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1368         if (ret < 0)
1369                 goto out;
1370         clifd = ret;
1371         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1372         if (ret < 0)
1373                 goto out;
1374         PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1375         buf[ret] = '\0';
1376         ret = check_perms(&c);
1377         if (ret < 0)
1378                 goto out;
1379         argc = split_args(buf, &argv, '\n');
1380         PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
1381         for (i = 0; cmds[i].name; i++) {
1382                 if (strcmp(cmds[i].name, argv[0]))
1383                         continue;
1384                 ret = cmds[i].handler(clifd, argc + 1, argv);
1385                 goto out;
1386         }
1387         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1388 out:
1389         free(buf);
1390         free(argv);
1391         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1392                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1393                 client_write(clifd, tmp);
1394                 free(tmp);
1395                 close(clifd);
1396         }
1397         return ret;
1398 }
1399
1400 static void audiod_get_socket(void)
1401 {
1402         struct sockaddr_un unix_addr;
1403
1404         if (conf.socket_given)
1405                 socket_name = para_strdup(conf.socket_arg);
1406         else {
1407                 char *hn = para_hostname();
1408                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1409                         hn);
1410                 free(hn);
1411         }
1412         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1413         if (conf.force_given)
1414                 unlink(socket_name);
1415         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1416                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1417         if (audiod_socket < 0) {
1418                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1419                 exit(EXIT_FAILURE); /* do not unlink socket */
1420         }
1421         if (listen(audiod_socket, 5) < 0) {
1422                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1423                 exit(EXIT_FAILURE); /* do not unlink socket */
1424         }
1425         add_close_on_fork_list(audiod_socket);
1426 }
1427
1428 static int open_stat_pipe(void)
1429 {
1430         int ret, fd[3] = {-1, 1, 0};
1431         char *argv[] = {BINDIR "/para_client", "stat", NULL};
1432         pid_t pid;
1433         ret = para_exec(&pid, BINDIR "/para_client",  argv, fd);
1434         if (ret >= 0) {
1435                 ret = fd[1];
1436                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1437                 add_close_on_fork_list(ret);
1438         } else
1439                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1440         return ret;
1441 }
1442
1443 static int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
1444 {
1445         int i, ret, max = -1;
1446
1447         FOR_EACH_SLOT(i) {
1448                 struct slot_info *s = &slot[i];
1449                 struct audio_format_info *a;
1450                 struct receiver_node *rn = s->receiver_node;
1451                 if (s->format < 0 || !rn)
1452                         continue;
1453                 a = &afi[s->format];
1454                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1455 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1456                 max = MAX(max, ret);
1457         }
1458         return max;
1459
1460 }
1461 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1462 {
1463         int i, ret;
1464
1465         FOR_EACH_SLOT(i) {
1466                 struct slot_info *s = &slot[i];
1467                 struct audio_format_info *a;
1468                 struct receiver_node *rn = s->receiver_node;
1469                 if (s->format < 0 || !rn || rn->eof)
1470                         continue;
1471                 a = &afi[s->format];
1472                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1473                 if (ret <= 0) {
1474                         if (ret)
1475                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1476                                 a->receiver->name, PARA_STRERROR(-ret), i);
1477                         else
1478                                 PARA_INFO_LOG("eof in slot %d\n", i);
1479                         rn->eof = 1;
1480                 }
1481                 if (ret < 0 && s->fci)
1482                         s->fci->error = ret;
1483         }
1484 }
1485
1486 /* TODO: move everything before the select call to pre_select() */
1487 static void __noreturn audiod_mainloop(void)
1488 {
1489         fd_set rfds, wfds;
1490         int ret, max_fileno, sbo = 0;
1491         char status_buf[STRINGSIZE] = "";
1492         struct timeval tv;
1493 repeat:
1494         FD_ZERO(&rfds);
1495         FD_ZERO(&wfds);
1496         max_fileno = 0;
1497         if (audiod_status != AUDIOD_ON)
1498                 kill_all_decoders();
1499         else if (playing)
1500                 start_current_receiver();
1501         max_fileno = set_stream_fds(&wfds);
1502         /* stat pipe (read) */
1503         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1504                 close_stat_pipe();
1505         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1506                 stat_pipe = open_stat_pipe();
1507                 sbo = 0;
1508                 status_buf[0] = '\0';
1509         }
1510         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
1511                 FD_SET(stat_pipe, &rfds);
1512                 max_fileno = MAX(max_fileno, stat_pipe);
1513         }
1514         /* always check signal pipe */
1515         FD_SET(signal_pipe, &rfds);
1516         max_fileno = MAX(max_fileno, signal_pipe);
1517         /* local socket */
1518         if (audiod_socket < 0)
1519                 audiod_get_socket(); /* doesn't return on errors */
1520         FD_SET(audiod_socket, &rfds);
1521         max_fileno = MAX(max_fileno, audiod_socket);
1522         tv.tv_sec = 0;
1523         tv.tv_usec = 200 * 1000;
1524         ret = pre_select(&rfds, &wfds, &tv);
1525         max_fileno = MAX(max_fileno, ret);
1526         ret = select(max_fileno + 1, &rfds, &wfds, NULL, &tv);
1527         if (ret < 0 && errno != EINTR)
1528                 PARA_ERROR_LOG("select returned %d (%s)\n", ret,
1529                         strerror(errno));
1530         if (audiod_status != AUDIOD_OFF)
1531                 audiod_status_dump();
1532         if (ret < 0)
1533                 goto repeat;
1534         audiod_post_select(ret, &rfds, &wfds);
1535         /* read status pipe */
1536         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1537                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1538                 if (ret <= 0) {
1539                         close_stat_pipe();
1540                         /* avoid busy loop if server is down */
1541                         while (sleep(1) > 0)
1542                                 ; /* try again*/
1543                 } else {
1544                         status_buf[ret + sbo] = '\0';
1545                         sbo = for_each_line(status_buf, ret + sbo,
1546                                 &check_stat_line);
1547                 }
1548         }
1549         slot_io(&wfds);
1550         if (FD_ISSET(audiod_socket, &rfds)) {
1551                 ret = handle_connect();
1552                 if (ret < 0) {
1553                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1554                 }
1555         }
1556         /* signals */
1557         if (FD_ISSET(signal_pipe, &rfds)) {
1558                 int sig_nr = para_next_signal();
1559                 if (sig_nr > 0)
1560                         handle_signal(sig_nr);
1561         }
1562         goto repeat;
1563 }
1564
1565 static void set_initial_status(void)
1566 {
1567         audiod_status = AUDIOD_ON;
1568         if (!conf.mode_given)
1569                 return;
1570         if (!strcmp(conf.mode_arg, "sb")) {
1571                 audiod_status = AUDIOD_STANDBY;
1572                 return;
1573         }
1574         if (!strcmp(conf.mode_arg, "off")) {
1575                 audiod_status = AUDIOD_OFF;
1576                 return;
1577         }
1578         if (strcmp(conf.mode_arg, "on"))
1579                 PARA_WARNING_LOG("%s", "invalid mode\n");
1580 }
1581
1582 int __noreturn main(int argc, char *argv[])
1583 {
1584         char *cf;
1585         int i;
1586
1587         valid_fd_012();
1588         hostname = para_hostname();
1589         cmdline_parser(argc, argv, &conf);
1590         para_drop_privileges(conf.user_arg);
1591         cf = configfile_exists();
1592         if (cf) {
1593                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1594                         fprintf(stderr, "parse error in config file\n");
1595                         exit(EXIT_FAILURE);
1596                 }
1597         }
1598         log_welcome("para_audiod", conf.loglevel_arg);
1599         i = init_stream_io();
1600         if (i < 0) {
1601                 fprintf(stderr, "init stream io error: %s\n",
1602                         PARA_STRERROR(-i));
1603                 exit(EXIT_FAILURE);
1604         }
1605         server_uptime(UPTIME_SET);
1606         set_initial_status();
1607         FOR_EACH_SLOT(i)
1608                 clear_slot(i);
1609         stat_item_ringbuf = ringbuffer_new(RINGBUFFER_SIZE);
1610         init_grabbing();
1611         setup_signal_handling();
1612         if (conf.daemon_given)
1613                 daemon_init();
1614         audiod_mainloop();
1615 }