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
  32 #include "error.h"
  33 #include "audiod.h"
  34 #include "net.h"
  35 #include "daemon.h"
  36 #include "string.h"
  37 #include "fd.h"
  38
  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 static char *stat_item_values[NUM_STAT_ITEMS];
 135 static FILE *logfile;
 136 static const struct timeval restart_delay = {0, 300 * 1000};
 137
 138 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 139
 140 static struct audiod_command cmds[] = {
 141 {
 142 .name = "cycle",
 143 .handler = com_cycle,
 144 .description = "switch to next mode",
 145 .synopsis = "cycle",
 146 .help =
 147
 148 "on -> standby -> off -> on\n"
 149
 150 },
 151 {
 152 .name = "grab",
 153 .handler = com_grab,
 154 .description = "grab the audio stream",
 155 .synopsis = "-- grab [grab_options]",
 156 .help =
 157
 158 "grab ('splice') the audio stream at any position in the filter      \n"
 159 "chain and send that data back to the client. Try\n"
 160 "\t para_audioc -- grab -h\n"
 161 "for the list of available options.\n"
 162 },
 163
 164 {
 165 .name = "help",
 166 .handler = com_help,
 167 .description = "display command list or help for given command",
 168 .synopsis = "help [command]",
 169 .help =
 170
 171 "When I was younger, so much younger than today, I never needed\n"
 172 "anybody's help in any way. But now these days are gone, I'm not so\n"
 173 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 174 "\n"
 175 "                               -- Beatles: Help\n"
 176
 177 },
 178 {
 179 .name = "off",
 180 .handler = com_off,
 181 .description = "deactivate para_audiod",
 182 .synopsis = "off",
 183 .help =
 184
 185 "Close connection to para_server and stop all decoders.\n"
 186
 187 },
 188 {
 189 .name = "on",
 190 .handler = com_on,
 191 .description = "activate para_audiod",
 192 .synopsis = "on",
 193 .help =
 194
 195 "Establish connection to para_server, retrieve para_server's current\n"
 196 "status. If playing, start corresponding decoder. Otherwise stop\n"
 197 "all decoders.\n"
 198
 199 },
 200 {
 201 .name = "sb",
 202 .handler = com_sb,
 203 .description = "enter standby mode",
 204 .synopsis = "sb",
 205 .help =
 206
 207 "Stop all decoders but leave connection to para_server open.\n"
 208
 209 },
 210 {
 211 .name = "stat",
 212 .handler = com_stat,
 213 .description = "print status information",
 214 .synopsis = "stat [item1 ...]",
 215 .help =
 216
 217 "Dump given status items (all if none given) to stdout.\n"
 218
 219 },
 220 {
 221 .name = "term",
 222 .handler = com_term,
 223 .description = "terminate audiod",
 224 .synopsis = "term",
 225 .help =
 226
 227 "Stop all decoders, shut down connection to para_server and exit.\n"
 228
 229 },
 230 {
 231 .name = NULL,
 232 }
 233 };
 234
 235 /** iterate over all slots */
 236 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
 237 /** iterate over all supported audio formats */
 238 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 239 /** iterate over the array of all audiod commands */
 240 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 241
 242 /**
 243  * get the audio format number
 244  * \param name the name of the audio format
 245  *
 246  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 247  * \a name is not a supported audio format.
 248  */
 249 int get_audio_format_num(char *name)
 250 {
 251         int i;
 252         FOR_EACH_AUDIO_FORMAT(i)
 253                 if (!strcmp(name, audio_formats[i]))
 254                         return i;
 255         return -E_UNSUPPORTED_AUDIO_FORMAT;
 256 }
 257
 258 /*
 259  * log function. first argument is loglevel.
 260  */
 261 void para_log(int ll, const char* fmt,...)
 262 {
 263         va_list argp;
 264         FILE *outfd;
 265         struct tm *tm;
 266         time_t t1;
 267         char str[MAXLINE] = "";
 268
 269         if (ll < conf.loglevel_arg)
 270                 return;
 271         outfd = logfile? logfile : stderr;
 272         time(&t1);
 273         tm = localtime(&t1);
 274         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 275         fprintf(outfd, "%s %s ", str, hostname);
 276         if (conf.loglevel_arg <= INFO)
 277                 fprintf(outfd, "%i ", ll);
 278         va_start(argp, fmt);
 279         vfprintf(outfd, fmt, argp);
 280         va_end(argp);
 281 }
 282
 283 static int client_write(int fd, const char *buf)
 284 {
 285         size_t len = strlen(buf);
 286         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 287 }
 288
 289 static char *get_time_string(struct timeval *newest_stime)
 290 {
 291         struct timeval now, diff, adj_stream_start, tmp;
 292         int total = 0, use_server_time = 1;
 293
 294         if (!playing) {
 295                 if (length_seconds)
 296                         return NULL;
 297                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 298         }
 299         if (audiod_status == AUDIOD_OFF)
 300                 goto out;
 301         if (sa_time_diff_sign > 0)
 302                 tv_diff(&server_stream_start, &sa_time_diff,
 303                         &adj_stream_start);
 304         else
 305                 tv_add(&server_stream_start, &sa_time_diff,
 306                         &adj_stream_start);
 307         tmp = adj_stream_start;
 308         if (newest_stime && audiod_status == AUDIOD_ON) {
 309                 tv_diff(newest_stime, &adj_stream_start, &diff);
 310                 if (tv2ms(&diff) < 5000) {
 311                         tmp = *newest_stime;
 312                         use_server_time = 0;
 313                 }
 314         }
 315         gettimeofday(&now, NULL);
 316         tv_diff(&now, &tmp, &diff);
 317         total = diff.tv_sec + offset_seconds;
 318         if (total > length_seconds)
 319                 total = length_seconds;
 320         if (total < 0)
 321                 total = 0;
 322 out:
 323         return make_message(
 324                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 325                 status_item_list[SI_PLAY_TIME],
 326                 use_server_time? "~" : "",
 327                 total / 60,
 328                 total % 60,
 329                 (length_seconds - total) / 60,
 330                 (length_seconds - total) % 60,
 331                 length_seconds? (total * 100 + length_seconds / 2) /
 332                         length_seconds : 0,
 333                 length_seconds / 60,
 334                 length_seconds % 60
 335         );
 336 }
 337
 338 __malloc static char *audiod_status_string(void)
 339 {
 340         const char *status = (audiod_status == AUDIOD_ON)?
 341                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 342         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 343 }
 344
 345 static struct timeval *wstime(void)
 346 {
 347         int i;
 348         struct timeval *max = NULL;
 349         FOR_EACH_SLOT(i) {
 350                 struct slot_info *s = &slot[i];
 351                 if (s->wpid <= 0)
 352                         continue;
 353                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 354                         continue;
 355                 max = &s->wstime;
 356         }
 357         return max;
 358 }
 359 __malloc static char *decoder_flags(void)
 360 {
 361         int i;
 362         char decoder_flags[MAX_STREAM_SLOTS + 1];
 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         }
 375         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 376         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 377                 decoder_flags);
 378 }
 379
 380 static char *configfile_exists(void)
 381 {
 382         static char *config_file;
 383
 384         if (!config_file) {
 385                 char *home = para_homedir();
 386                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 387                 free(home);
 388         }
 389         return file_exists(config_file)? config_file : NULL;
 390 }
 391
 392 static void setup_signal_handling(void)
 393 {
 394         signal_pipe = para_signal_init();
 395         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 396         para_install_sighandler(SIGINT);
 397         para_install_sighandler(SIGTERM);
 398         para_install_sighandler(SIGCHLD);
 399         para_install_sighandler(SIGHUP);
 400         signal(SIGPIPE, SIG_IGN);
 401 }
 402
 403 static void audiod_status_dump(void)
 404 {
 405         static char *p_ts, *p_us, *p_as, *p_df;
 406         struct timeval *t = wstime();
 407         char *us, *tmp = get_time_string(t);
 408
 409         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 410                 stat_client_write(tmp, SI_PLAY_TIME);
 411         free(p_ts);
 412         p_ts = tmp;
 413
 414         us = uptime_str();
 415         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 416         free(us);
 417         if (!p_us || strcmp(p_us, tmp))
 418                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 419         free(p_us);
 420         p_us = tmp;
 421
 422         tmp = audiod_status_string();
 423         if (!p_as || strcmp(p_as, tmp))
 424                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 425         free(p_as);
 426         p_as = tmp;
 427
 428         tmp = decoder_flags();
 429         if (!p_df || strcmp(p_df, tmp))
 430                 stat_client_write(tmp, SI_DECODER_FLAGS);
 431         free(p_df);
 432         p_df = tmp;
 433 }
 434
 435 static void clear_slot(int slot_num)
 436 {
 437         struct slot_info *s = &slot[slot_num];
 438
 439         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 440         memset(s, 0, sizeof(struct slot_info));
 441         s->format = -1;
 442 }
 443
 444 static void kill_stream_writer(int slot_num)
 445 {
 446         struct slot_info *s = &slot[slot_num];
 447
 448         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 449                 return;
 450         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 451                 s->wpid, audio_formats[s->format], slot_num);
 452         kill(s->wpid, SIGTERM);
 453         s->wkilled = 1;
 454         s->fci->error = 1;
 455 }
 456
 457 static void set_restart_barrier(int format, struct timeval *now)
 458 {
 459         struct timeval tmp;
 460
 461         if (now)
 462                 tmp = *now;
 463         else
 464                 gettimeofday(&tmp, NULL);
 465         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 466 }
 467
 468 static void close_receiver(int slot_num)
 469 {
 470         struct slot_info *s = &slot[slot_num];
 471         struct audio_format_info *a;
 472
 473         if (s->format < 0 || !s->receiver_node)
 474                 return;
 475         a = &afi[s->format];
 476         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 477                 audio_formats[s->format] , slot_num);
 478         a->receiver->close(s->receiver_node);
 479         free(s->receiver_node);
 480         s->receiver_node = NULL;
 481         set_restart_barrier(s->format, NULL);
 482 }
 483
 484 static void kill_all_decoders(void)
 485 {
 486         int i;
 487
 488         FOR_EACH_SLOT(i)
 489                 if (slot[i].format >= 0) {
 490                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 491                         kill_stream_writer(i);
 492                 }
 493 }
 494
 495 static void check_sigchld(void)
 496 {
 497         pid_t pid;
 498         int i;
 499         struct timeval now;
 500         gettimeofday(&now, NULL);
 501
 502 reap_next_child:
 503         pid = para_reap_child();
 504         if (pid <= 0)
 505                 return;
 506         FOR_EACH_SLOT(i) {
 507                 struct slot_info *s = &slot[i];
 508                 long lifetime;
 509                 if (s->format < 0)
 510                         continue;
 511                 if (pid == s->wpid) {
 512                         s->wpid = -1;
 513                         lifetime = now.tv_sec - s->wstime.tv_sec;
 514                         PARA_INFO_LOG("%s stream writer in slot %d died "
 515                                 "after %li secs\n",
 516                                 audio_formats[s->format], i, lifetime);
 517                         set_restart_barrier(s->format, &now);
 518                         goto reap_next_child;
 519                 }
 520         }
 521         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 522         goto reap_next_child;
 523 }
 524
 525 static int get_empty_slot(void)
 526 {
 527         int i;
 528         struct slot_info *s;
 529
 530         FOR_EACH_SLOT(i) {
 531                 s = &slot[i];
 532                 if (s->format < 0) {
 533                         clear_slot(i);
 534                         return i;
 535                 }
 536                 if (s->write_fd > 0 || s->wpid > 0)
 537                         continue;
 538                 if (s->receiver_node)
 539                         continue;
 540                 if (s->fci)
 541                         continue;
 542                 clear_slot(i);
 543                 return i;
 544         }
 545         return -E_NO_MORE_SLOTS;
 546 }
 547
 548 static int decoder_running(int format)
 549 {
 550         int i, ret = 0;
 551         struct slot_info *s;
 552
 553         FOR_EACH_SLOT(i) {
 554                 s = &slot[i];
 555                 if (s->format == format && s->receiver_node)
 556                         ret |= 1;
 557                 if (s->format == format && s->wpid > 0)
 558                         ret |= 2;
 559         }
 560         return ret;
 561 }
 562
 563 static void close_stat_pipe(void)
 564 {
 565         int i;
 566
 567         if (stat_pipe < 0)
 568                 return;
 569         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 570         close(stat_pipe);
 571         del_close_on_fork_list(stat_pipe);
 572         stat_pipe = -1;
 573         kill_all_decoders();
 574         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 575                 free(stat_item_values[i]);
 576                 stat_item_values[i] = NULL;
 577         }
 578         dump_empty_status();
 579         length_seconds = 0;
 580         offset_seconds = 0;
 581         audiod_status_dump();
 582         playing = 0;
 583         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 584                 status_item_list[SI_STATUS_BAR]);
 585         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 586 }
 587
 588 static void __noreturn clean_exit(int status, const char *msg)
 589 {
 590         PARA_EMERG_LOG("%s\n", msg);
 591         kill_all_decoders();
 592         if (socket_name)
 593                 unlink(socket_name);
 594         if (stat_pipe >= 0)
 595                 close_stat_pipe();
 596         exit(status);
 597 }
 598
 599 __malloc static char *glob_cmd(char *cmd)
 600 {
 601         char *ret, *replacement;
 602         struct timeval tmp, delay, rss; /* real stream start */
 603
 604         delay.tv_sec = conf.stream_delay_arg / 1000;
 605         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 606 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 607         if (sa_time_diff_sign < 0)
 608                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 609         else
 610                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 611         tv_add(&rss, &delay, &tmp);
 612         replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
 613         ret = s_a_r(cmd, "STREAM_START", replacement);
 614         free(replacement);
 615         if (!ret)
 616                 goto out;
 617         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 618         {
 619         struct timeval now;
 620         gettimeofday(&now, NULL);
 621         PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
 622         }
 623 out:
 624         return ret;
 625 }
 626
 627 /** get the number of filters for the given audio format */
 628 int num_filters(int audio_format_num)
 629 {
 630         return afi[audio_format_num].num_filters;
 631 }
 632
 633 static void open_filters(int slot_num)
 634 {
 635         struct slot_info *s = &slot[slot_num];
 636         struct audio_format_info *a = &afi[s->format];
 637         int nf = a->num_filters;
 638         int i;
 639
 640         s->fci = para_calloc(sizeof(struct filter_chain_info));
 641         INIT_LIST_HEAD(&s->fci->filters);
 642         if (!nf)
 643                 return;
 644         s->fci->inbuf = s->receiver_node->buf;
 645         s->fci->in_loaded = &s->receiver_node->loaded;
 646         s->fci->outbuf = s->receiver_node->buf;
 647         s->fci->out_loaded = &s->receiver_node->loaded;
 648         s->fci->eof = &s->receiver_node->eof;
 649         for (i = 0; i < nf; i++) {
 650                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 651                 fn->conf = a->filter_conf[i];
 652                 fn->fci = s->fci;
 653                 fn->filter = a->filters[i];
 654                 INIT_LIST_HEAD(&fn->callbacks);
 655                 list_add_tail(&fn->node, &s->fci->filters);
 656                 fn->filter->open(fn);
 657                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 658                         audio_formats[s->format], i + 1,  nf,
 659                         fn->filter->name, slot_num);
 660                 s->fci->outbuf = fn->buf;
 661                 s->fci->out_loaded = &fn->loaded;
 662         }
 663         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 664                 s->fci->outbuf);
 665 }
 666
 667 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 668 {
 669         struct filter_node *fn;
 670         int i, j;
 671
 672         FOR_EACH_SLOT(i) {
 673                 struct slot_info *s = &slot[i];
 674                 if (s->format < 0 || !s->fci)
 675                         continue;
 676                 if (slot_num >= 0 && slot_num != i)
 677                         continue;
 678                 if (format >= 0 && s->format != format)
 679                         continue;
 680                 if (num_filters(i) < filternum)
 681                         continue;
 682                 /* success */
 683                 j = 1;
 684                 list_for_each_entry(fn, &s->fci->filters, node)
 685                         if (filternum <= 0 || j++ == filternum)
 686                                 break;
 687                 return fn;
 688         }
 689         return NULL;
 690 }
 691
 692 static void start_stream_writer(int slot_num)
 693 {
 694         int ret, fds[3] = {1, -1, -1};
 695         struct slot_info *s = &slot[slot_num];
 696         struct audio_format_info *a = &afi[s->format];
 697         char *glob = NULL;
 698
 699         if (a->write_cmd)
 700                 glob = glob_cmd(a->write_cmd);
 701         if (!glob)
 702                 glob = para_strdup("para_play");
 703         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 704         open_filters(slot_num);
 705         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 706         free(glob);
 707         if (ret < 0) {
 708                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 709                 return;
 710         }
 711         s->write_fd = fds[0];
 712         add_close_on_fork_list(s->write_fd);
 713         /* we write to this fd in do_select, so we need non-blocking */
 714         mark_fd_nonblock(s->write_fd);
 715         gettimeofday(&s->wstime, NULL);
 716         current_decoder = slot_num;
 717         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 718 }
 719
 720 static void open_receiver(int format)
 721 {
 722         struct audio_format_info *a = &afi[format];
 723         struct slot_info *s;
 724         int ret, slot_num;
 725
 726         slot_num = get_empty_slot();
 727         if (slot_num < 0)
 728                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 729         s = &slot[slot_num];
 730         s->format = format;
 731         gettimeofday(&s->rtime, NULL);
 732         s->wtime = s->rtime;
 733         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 734         s->receiver_node->conf = a->receiver_conf;
 735         ret = a->receiver->open(s->receiver_node);
 736         if (ret < 0) {
 737                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 738                         PARA_STRERROR(-ret));
 739                 free(s->receiver_node);
 740                 s->receiver_node = NULL;
 741                 return;
 742         }
 743         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 744                 audio_formats[s->format], a->receiver->name, slot_num);
 745 }
 746
 747 static int is_frozen(int format)
 748 {
 749         struct timeval now;
 750         struct audio_format_info *a = &afi[format];
 751
 752         gettimeofday(&now, NULL);
 753         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 754 }
 755
 756 static void start_current_receiver(void)
 757 {
 758         int i;
 759
 760         if (!af_status)
 761                 return;
 762         i = get_audio_format_num(af_status);
 763         if (i < 0)
 764                 return;
 765         if ((decoder_running(i) & 1) || is_frozen(i))
 766                 return;
 767         open_receiver(i);
 768 }
 769
 770 static void compute_time_diff(const struct timeval *status_time)
 771 {
 772         struct timeval now, tmp, diff;
 773         static int count;
 774         int sign;
 775         const struct timeval max_deviation = {0, 500 * 1000};
 776         const int time_smooth = 5;
 777
 778         gettimeofday(&now, NULL);
 779         sign = tv_diff(status_time, &now, &diff);
 780 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 781 //                      sign, sa_time_diff_sign);
 782         if (!count) {
 783                 sa_time_diff_sign = sign;
 784                 sa_time_diff = diff;
 785                 count++;
 786                 return;
 787         }
 788         if (count > 5) {
 789                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 790                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 791                         PARA_WARNING_LOG("time diff jump: %lims\n",
 792                                 s * tv2ms(&tmp));
 793         }
 794         count++;
 795         sa_time_diff_sign = tv_convex_combination(
 796                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 797                 count > 10? sign : sign * time_smooth, &diff,
 798                 &tmp);
 799         sa_time_diff = tmp;
 800         PARA_INFO_LOG("time diff (cur/avg): "
 801                 "%li:%lu/%li:%lu\n",
 802                 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
 803                 sa_time_diff_sign * sa_time_diff.tv_sec,
 804                 (sa_time_diff.tv_usec + 500)/ 1000);
 805 }
 806
 807 static void check_stat_line(char *line)
 808 {
 809         int itemnum;
 810         size_t ilen = 0;
 811         struct timeval tv;
 812         char *tmp;
 813
 814         if (!line)
 815                 return;
 816         itemnum = stat_line_valid(line);
 817         if (itemnum < 0) {
 818                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 819                 return;
 820         }
 821         tmp = make_message("%s\n", line);
 822         stat_client_write(tmp, itemnum);
 823         free(tmp);
 824         free(stat_item_values[itemnum]);
 825         stat_item_values[itemnum] = para_strdup(line);
 826         ilen = strlen(status_item_list[itemnum]);
 827         switch (itemnum) {
 828         case SI_STATUS:
 829                 playing = strstr(line, "playing")? 1 : 0;
 830                 break;
 831         case SI_FORMAT:
 832                 free(af_status);
 833                 af_status = para_strdup(line + ilen + 1);
 834                 break;
 835         case SI_OFFSET:
 836                 offset_seconds = atoi(line + ilen + 1);
 837                 break;
 838         case SI_LENGTH:
 839                 length_seconds = atoi(line + ilen + 1);
 840                 break;
 841         case SI_STREAM_START:
 842                 if (sscanf(line + ilen + 1, "%lu.%lu",
 843                                 &tv.tv_sec, &tv.tv_usec) == 2)
 844                         server_stream_start = tv;
 845                 break;
 846         case SI_CURRENT_TIME:
 847                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 848                                 &tv.tv_usec) == 2)
 849                         compute_time_diff(&tv);
 850                 break;
 851         }
 852 }
 853
 854 static void handle_signal(int sig)
 855 {
 856         switch (sig) {
 857         case SIGCHLD:
 858                 return check_sigchld();
 859         case SIGINT:
 860         case SIGTERM:
 861         case SIGHUP:
 862                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 863                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 864                 return;
 865         }
 866 }
 867
 868 static void check_timeouts(void)
 869 {
 870         struct timeval now;
 871         int slot_num, timeout = conf.stream_timeout_arg;
 872
 873         gettimeofday(&now, NULL);
 874         FOR_EACH_SLOT(slot_num) {
 875                 struct slot_info *s = &slot[slot_num];
 876                 if (s->format < 0)
 877                         continue;
 878                 /* check read time */
 879                 if (s->receiver_node &&
 880                         now.tv_sec > s->rtime.tv_sec + timeout) {
 881                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 882                                 audio_formats[s->format], slot_num);
 883                         if (s->fci)
 884                                 s->fci->error = 42;
 885                         else
 886                                 close_receiver(slot_num);
 887                 }
 888                 /* check write time */
 889                 if (s->wpid > 0 && !s->wkilled &&
 890                         now.tv_sec > s->wtime.tv_sec + timeout) {
 891                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 892                                 audio_formats[s->format], slot_num);
 893                         if (s->fci)
 894                                 s->fci->error = 42;
 895                 }
 896         }
 897 }
 898
 899 static size_t get_loaded_bytes(int slot_num)
 900 {
 901         size_t loaded = 0;
 902         struct slot_info *s = &slot[slot_num];
 903         struct receiver_node *rn = s->receiver_node;
 904
 905         if (s->format < 0)
 906                 goto out;
 907
 908         if (afi[s->format].num_filters) {
 909                 if (s->fci)
 910                         loaded = *s->fci->out_loaded;
 911         } else {
 912                 if (rn)
 913                         loaded = rn->loaded;
 914         }
 915 out:
 916         return loaded;
 917 }
 918
 919
 920 static void close_decoder_if_idle(int slot_num)
 921 {
 922         struct slot_info *s = &slot[slot_num];
 923         struct receiver_node *rn = s->receiver_node;
 924
 925         if (s->format < 0)
 926                 return;
 927         if (!s->fci)
 928                 return;
 929         if (!rn->eof && !s->fci->error && s->wpid > 0)
 930                 return;
 931         if (!s->fci->error && s->wpid > 0) { /* eof */
 932                 if (filter_io(s->fci) > 0)
 933                         return;
 934                 if (get_loaded_bytes(slot_num))
 935                         return;
 936         }
 937         if (s->write_fd > 0) {
 938                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 939                         s->write_fd);
 940                 close(s->write_fd);
 941                 del_close_on_fork_list(s->write_fd);
 942                 s->write_fd = -1;
 943         }
 944         if (s->wpid > 0)
 945                 return; /* wait until writer dies before closing filters */
 946         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 947                 slot_num, s->fci);
 948         close_filters(s->fci);
 949         free(s->fci);
 950         close_receiver(slot_num);
 951         clear_slot(slot_num);
 952 }
 953
 954 static void set_stream_fds(fd_set *wfds, int *max_fileno)
 955 {
 956         int i;
 957
 958         check_timeouts();
 959         FOR_EACH_SLOT(i) {
 960                 struct slot_info *s = &slot[i];
 961                 struct audio_format_info *a;
 962                 struct receiver_node *rn;
 963
 964                 close_decoder_if_idle(i);
 965                 s->wcheck = 0;
 966                 if (s->format < 0)
 967                         continue;
 968                 a = &afi[s->format];
 969                 rn = s->receiver_node;
 970                 if (rn && rn->loaded && !s->wpid) {
 971                         PARA_INFO_LOG("no writer in slot %d\n", i);
 972                         start_stream_writer(i);
 973                 }
 974                 if (s->write_fd <= 0)
 975                         continue;
 976                 if (!get_loaded_bytes(i))
 977                         continue;
 978                 para_fd_set(s->write_fd, wfds, max_fileno);
 979                 s->wcheck = 1;
 980         }
 981 }
 982
 983 static int write_audio_data(int slot_num)
 984 {
 985         struct slot_info *s = &slot[slot_num];
 986         struct audio_format_info *a = &afi[s->format];
 987         struct receiver_node *rn = s->receiver_node;
 988         int rv;
 989         char **buf;
 990         size_t *len;
 991
 992         if (a->num_filters) {
 993                 buf = &s->fci->outbuf;
 994                 len = s->fci->out_loaded;
 995         } else {
 996                 buf = &rn->buf;
 997                 len = &rn->loaded;
 998         }
 999         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1000         rv = write(s->write_fd, *buf, *len);
1001         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1002         if (rv < 0) {
1003                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1004                         slot_num, s->write_fd, strerror(errno));
1005                 *len = 0;
1006                 s->fci->error = E_WRITE_AUDIO_DATA;
1007         } else if (rv != *len) {
1008                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1009                         audio_formats[s->format], rv, *len, slot_num);
1010                 *len -= rv;
1011                 memmove(*buf, *buf + rv, *len);
1012         } else
1013                 *len = 0;
1014         if (rv > 0)
1015                 gettimeofday(&s->wtime, NULL);
1016         return rv;
1017 }
1018
1019 static void slot_io(fd_set *wfds)
1020 {
1021         int ret, i;
1022
1023         FOR_EACH_SLOT(i) {
1024                 struct slot_info *s = &slot[i];
1025                 struct receiver_node *rn = s->receiver_node;
1026
1027                 if (rn && rn->loaded)
1028                         gettimeofday(&s->rtime, NULL);
1029                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1030                         ret = filter_io(s->fci);
1031                         if (ret < 0)
1032                                 s->fci->error = -ret;
1033 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1034 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1035                 }
1036                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1037                         continue;
1038                 write_audio_data(i);
1039         }
1040 }
1041
1042 static int parse_stream_command(const char *txt, char **cmd)
1043 {
1044         char *p = strchr(txt, ':');
1045         int i;
1046
1047         if (!p)
1048                 return -E_MISSING_COLON;
1049         p++;
1050         FOR_EACH_AUDIO_FORMAT(i) {
1051                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1052                         continue;
1053                 *cmd = p;
1054                 return i;
1055         }
1056         return -E_UNSUPPORTED_AUDIO_FORMAT;
1057 }
1058
1059 static int add_filter(int format, char *cmdline)
1060 {
1061         struct audio_format_info *a = &afi[format];
1062         int filter_num, nf = a->num_filters;
1063
1064         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1065         if (filter_num < 0)
1066                 return filter_num;
1067         a->filters[nf] = &filters[filter_num];
1068         a->num_filters++;
1069         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1070                 a->filters[nf]->name);
1071         return filter_num;
1072 }
1073
1074 static int setup_default_filters(void)
1075 {
1076         int i, ret = 1;
1077
1078         FOR_EACH_AUDIO_FORMAT(i) {
1079                 struct audio_format_info *a = &afi[i];
1080                 char *tmp;
1081                 int j;
1082                 if (a->num_filters)
1083                         continue;
1084                 /* add "dec" to audio format name */
1085                 tmp = make_message("%sdec", audio_formats[i]);
1086                 for (j = 0; filters[j].name; j++)
1087                         if (!strcmp(tmp, filters[j].name))
1088                                 break;
1089                 free(tmp);
1090                 ret = -E_UNSUPPORTED_FILTER;
1091                 if (!filters[j].name)
1092                         goto out;
1093                 tmp = para_strdup(filters[j].name);
1094                 ret = add_filter(i, tmp);
1095                 free(tmp);
1096                 if (ret < 0)
1097                         goto out;
1098                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1099                 ret = add_filter(i, para_strdup("wav"));
1100                 if (ret < 0)
1101                         goto out;
1102                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1103         }
1104 out:
1105         return ret;
1106 }
1107
1108 static int init_stream_io(void)
1109 {
1110         int i, ret, receiver_num;
1111         char *cmd;
1112
1113         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1114                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1115                 if (ret < 0)
1116                         goto out;
1117                 afi[ret].write_cmd = para_strdup(cmd);
1118                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1119         }
1120         for (i = 0; receivers[i].name; i++) {
1121                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1122                 receivers[i].init(&receivers[i]);
1123         }
1124         for (i = 0; i < conf.receiver_given; i++) {
1125                 char *arg = conf.receiver_arg[i];
1126                 char *recv = strchr(arg, ':');
1127                 ret = -E_MISSING_COLON;
1128                 if (!recv)
1129                         goto out;
1130                 *recv = '\0';
1131                 recv++;
1132                 ret = get_audio_format_num(arg);
1133                 if (ret < 0)
1134                         goto out;
1135                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1136                 if (!afi[ret].receiver_conf) {
1137                         ret = -E_RECV_SYNTAX;
1138                         goto out;
1139                 }
1140                 afi[ret].receiver = &receivers[receiver_num];
1141         }
1142         /* use the first available receiver with no arguments
1143          * for those audio formats for which no receiver
1144          * was specified
1145          */
1146         cmd = para_strdup(receivers[0].name);
1147         FOR_EACH_AUDIO_FORMAT(i) {
1148                 struct audio_format_info *a = &afi[i];
1149                 if (a->receiver_conf)
1150                         continue;
1151                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1152                 if (!a->receiver_conf)
1153                         return -E_RECV_SYNTAX;
1154                 a->receiver = &receivers[receiver_num];
1155         }
1156         free(cmd);
1157         /* filters */
1158         filter_init(filters);
1159         FOR_EACH_AUDIO_FORMAT(i) {
1160                 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1161                 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1162         }
1163         if (!conf.no_default_filters_given)
1164                 return setup_default_filters();
1165         for (i = 0; i < conf.filter_given; i++) {
1166                 char *arg = conf.filter_arg[i];
1167                 char *filter_name = strchr(arg, ':');
1168                 ret = -E_MISSING_COLON;
1169                 if (!filter_name)
1170                         goto out;
1171                 *filter_name = '\0';
1172                 filter_name++;
1173                 ret = get_audio_format_num(arg);
1174                 if (ret < 0)
1175                         goto out;
1176                 ret = add_filter(ret, filter_name);
1177                 if (ret < 0)
1178                         goto out;
1179         }
1180         ret = 1;
1181 out:
1182         return ret;
1183 }
1184
1185 static int dump_commands(int fd)
1186 {
1187         char *buf = para_strdup(""), *tmp = NULL;
1188         int i;
1189         ssize_t ret;
1190
1191         FOR_EACH_COMMAND(i) {
1192                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1193                         cmds[i].description);
1194                 free(buf);
1195                 buf = tmp;
1196         }
1197         ret = client_write(fd, buf);
1198         free(buf);
1199         return ret;
1200 }
1201
1202 /*
1203  * command handlers don't close their fd on errors (ret < 0) so that
1204  * its caller can send an error message. Otherwise (ret >= 0) it's up
1205  * to each individual command to close the fd if necessary.
1206  */
1207
1208 static int com_help(int fd, int argc, char **argv)
1209 {
1210         int i, ret;
1211         char *buf;
1212         const char *dflt = "No such command. Available commands:\n";
1213
1214         if (argc < 2) {
1215                 ret = dump_commands(fd);
1216                 goto out;
1217         }
1218         FOR_EACH_COMMAND(i) {
1219                 if (strcmp(cmds[i].name, argv[1]))
1220                         continue;
1221                 buf = make_message(
1222                         "NAME\n\t%s -- %s\n"
1223                         "SYNOPSIS\n\tpara_audioc %s\n"
1224                         "DESCRIPTION\n%s\n",
1225                         argv[1],
1226                         cmds[i].description,
1227                         cmds[i].synopsis,
1228                         cmds[i].help
1229                 );
1230                 ret = client_write(fd, buf);
1231                 free(buf);
1232                 goto out;
1233         }
1234         ret = client_write(fd, dflt);
1235         if (ret > 0)
1236                 ret = dump_commands(fd);
1237 out:
1238         if (ret >= 0)
1239                 close(fd);
1240         return ret;
1241 }
1242
1243 static int com_stat(int fd, __unused int argc, __unused char **argv)
1244 {
1245         int i, ret;
1246         char *buf = NULL;
1247         long unsigned mask = ~0LU;
1248
1249         if (argc > 1) {
1250                 mask = 0;
1251                 for (i = 1; i < argc; i++) {
1252                         ret = stat_item_valid(argv[i]);
1253                         if (ret < 0)
1254                                 return ret;
1255                         mask |= (1 << ret);
1256                 }
1257         }
1258         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1259         if (mask & (1 << SI_PLAY_TIME)) {
1260                 struct timeval *t = wstime();
1261                 char *ts = get_time_string(t);
1262                 if (ts) {
1263                         ret = client_write(fd, ts);
1264                         if (ret < 0)
1265                                 goto out;
1266                         free(ts);
1267                 }
1268         }
1269         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1270                 char *tmp, *us = uptime_str();
1271                 tmp = make_message("%s:%s\n",
1272                         status_item_list[SI_AUDIOD_UPTIME], us);
1273                 free(us);
1274                 ret = client_write(fd, tmp);
1275                 if (ret < 0)
1276                         goto out;
1277                 free(tmp);
1278         }
1279         if (mask & (1 << SI_AUDIOD_STATUS)) {
1280                 char *s = audiod_status_string();
1281                 ret = client_write(fd, s);
1282                 if (ret < 0)
1283                         goto out;
1284                 free(s);
1285         }
1286         if (mask & (1 << SI_DECODER_FLAGS)) {
1287                 char *df =decoder_flags();
1288                 ret = client_write(fd, df);
1289                 if (ret < 0)
1290                         goto out;
1291                 free(df);
1292         }
1293
1294         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1295                 char *tmp, *v;
1296                 if (!((1 << i) & mask))
1297                         continue;
1298                 v = stat_item_values[i];
1299                 tmp = make_message("%s%s%s", buf? buf: "",
1300                         v? v : "", v? "\n" : "");
1301                 free(buf);
1302                 buf = tmp;
1303         }
1304         ret = client_write(fd, buf);
1305 out:
1306         if (ret > 0)
1307                 ret = stat_client_add(fd, mask);
1308         free(buf);
1309         return ret;
1310 }
1311
1312 #if 0
1313 static char *list_filters(void)
1314 {
1315         int i, j;
1316         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1317
1318         FOR_EACH_AUDIO_FORMAT(i) {
1319                 for (j = 0; j < afi[i].num_filters; j++) {
1320                         tmp = make_message("%s\t%i\t%s\n",
1321                                 afi[i].name, j, afi[i].filter_cmds[j]);
1322                         msg = para_strcat(msg, tmp);
1323                         free(tmp);
1324                 }
1325                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1326                         j, afi[i].write_cmd);
1327                 msg = para_strcat(msg, tmp);
1328                 free(tmp);
1329         }
1330         return msg;
1331 }
1332 #endif
1333
1334 static int com_grab(int fd, int argc, char **argv)
1335 {
1336         struct grab_client *gc;
1337         struct filter_node *fn;
1338         int i, err;
1339         char *msg;
1340
1341         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1342         gc = grab_client_new(fd, argc, argv, &err);
1343         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1344         if (!gc)
1345                 goto err_out;
1346         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1347         if (fn)
1348                 activate_grab_client(gc, fn);
1349         return 1;
1350 err_out:
1351         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1352                 return err;
1353         if (err == -E_GC_HELP_GIVEN) {
1354                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1355                 for (i = 0; grab_client_args_info_help[i]; i++) {
1356                         char *tmp = make_message("%s%s\n", msg,
1357                                 grab_client_args_info_help[i]);
1358                         free(msg);
1359                         msg = tmp;
1360                 }
1361         } else
1362                 msg = make_message("%s %s\n",
1363                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1364                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1365         err = client_write(fd, msg);
1366         free(msg);
1367         if (err < 0)
1368                 return err;
1369         close(fd);
1370         return 1;
1371 }
1372
1373 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1374 {
1375         close(fd);
1376         clean_exit(EXIT_SUCCESS, "terminating on user request");
1377 }
1378
1379 static int com_on(int fd, __unused int argc, __unused char **argv)
1380 {
1381         audiod_status = AUDIOD_ON;
1382         close(fd);
1383         return 1;
1384 }
1385
1386 static int com_off(int fd, __unused int argc, __unused char **argv)
1387 {
1388         audiod_status = AUDIOD_OFF;
1389         close(fd);
1390         return 1;
1391 }
1392
1393 static int com_sb(int fd, __unused int argc, __unused char **argv)
1394 {
1395         audiod_status = AUDIOD_STANDBY;
1396         close(fd);
1397         return 1;
1398 }
1399
1400 static int com_cycle(int fd, int argc, char **argv)
1401 {
1402         switch (audiod_status) {
1403                 case  AUDIOD_ON:
1404                         return com_sb(fd, argc, argv);
1405                         break;
1406                 case  AUDIOD_OFF:
1407                         return com_on(fd, argc, argv);
1408                         break;
1409                 case  AUDIOD_STANDBY:
1410                         return com_off(fd, argc, argv);
1411                         break;
1412         }
1413         close(fd);
1414         return 1;
1415 }
1416
1417 static int check_perms(struct ucred *c)
1418 {
1419         int i;
1420
1421         if (!conf.user_allow_given)
1422                 return 1;
1423         for (i = 0; i < conf.user_allow_given; i++)
1424                 if (c->uid == conf.user_allow_arg[i])
1425                         return 1;
1426         return -E_UCRED_PERM;
1427 }
1428
1429 static int handle_connect(void)
1430 {
1431         int i, argc, ret, clifd = -1;
1432         struct ucred c;
1433         char *buf = para_malloc(MAXLINE), **argv = NULL;
1434         struct sockaddr_un unix_addr;
1435
1436         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1437         if (ret < 0)
1438                 goto out;
1439         clifd = ret;
1440         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1441         if (ret < 0)
1442                 goto out;
1443         PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1444         buf[ret] = '\0';
1445         ret = check_perms(&c);
1446         if (ret < 0)
1447                 goto out;
1448         argc = split_args(buf, &argv, '\n');
1449         PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
1450         for (i = 0; cmds[i].name; i++) {
1451                 if (strcmp(cmds[i].name, argv[0]))
1452                         continue;
1453                 ret = cmds[i].handler(clifd, argc + 1, argv);
1454                 goto out;
1455         }
1456         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1457 out:
1458         free(buf);
1459         free(argv);
1460         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1461                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1462                 client_write(clifd, tmp);
1463                 free(tmp);
1464                 close(clifd);
1465         }
1466         return ret;
1467 }
1468
1469 static void audiod_get_socket(void)
1470 {
1471         struct sockaddr_un unix_addr;
1472
1473         if (conf.socket_given)
1474                 socket_name = para_strdup(conf.socket_arg);
1475         else {
1476                 char *hn = para_hostname();
1477                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1478                         hn);
1479                 free(hn);
1480         }
1481         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1482         if (conf.force_given)
1483                 unlink(socket_name);
1484         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1485                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1486         if (audiod_socket < 0) {
1487                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1488                 exit(EXIT_FAILURE); /* do not unlink socket */
1489         }
1490         if (listen(audiod_socket, 5) < 0) {
1491                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1492                 exit(EXIT_FAILURE); /* do not unlink socket */
1493         }
1494         add_close_on_fork_list(audiod_socket);
1495 }
1496
1497 static int open_stat_pipe(void)
1498 {
1499         int ret, fd[3] = {-1, 1, 0};
1500         pid_t pid;
1501         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1502         if (ret >= 0) {
1503                 ret = fd[1];
1504                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1505                 add_close_on_fork_list(ret);
1506         } else
1507                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1508         return ret;
1509 }
1510
1511 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1512                 int *max_fileno)
1513 {
1514         int i, ret;
1515
1516         FOR_EACH_SLOT(i) {
1517                 struct slot_info *s = &slot[i];
1518                 struct audio_format_info *a;
1519                 struct receiver_node *rn = s->receiver_node;
1520                 if (s->format < 0 || !rn)
1521                         continue;
1522                 a = &afi[s->format];
1523                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1524 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1525                 *max_fileno = MAX(*max_fileno, ret);
1526         }
1527 }
1528 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1529 {
1530         int i, ret;
1531
1532         FOR_EACH_SLOT(i) {
1533                 struct slot_info *s = &slot[i];
1534                 struct audio_format_info *a;
1535                 struct receiver_node *rn = s->receiver_node;
1536                 if (s->format < 0 || !rn || rn->eof)
1537                         continue;
1538                 a = &afi[s->format];
1539                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1540                 if (ret <= 0) {
1541                         if (ret)
1542                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1543                                 a->receiver->name, PARA_STRERROR(-ret), i);
1544                         else
1545                                 PARA_INFO_LOG("eof in slot %d\n", i);
1546                         rn->eof = 1;
1547                 }
1548                 if (ret < 0 && s->fci)
1549                         s->fci->error = ret;
1550         }
1551 }
1552
1553 /* TODO: move everything before the select call to pre_select() */
1554 static void __noreturn audiod_mainloop(void)
1555 {
1556         fd_set rfds, wfds;
1557         int ret, max_fileno, sbo = 0;
1558         char status_buf[STRINGSIZE] = "";
1559         struct timeval tv;
1560 repeat:
1561         FD_ZERO(&wfds);
1562         FD_ZERO(&rfds);
1563         /* always check signal pipe and the local socket */
1564         FD_SET(signal_pipe, &rfds);
1565         max_fileno = signal_pipe;
1566         para_fd_set(audiod_socket, &rfds, &max_fileno);
1567
1568         if (audiod_status != AUDIOD_ON)
1569                 kill_all_decoders();
1570         else if (playing)
1571                 start_current_receiver();
1572
1573         set_stream_fds(&wfds, &max_fileno);
1574         /* status pipe */
1575         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1576                 close_stat_pipe();
1577         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1578                 stat_pipe = open_stat_pipe();
1579                 sbo = 0;
1580                 status_buf[0] = '\0';
1581         }
1582         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1583                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1584         /* local socket */
1585         tv.tv_sec = 0;
1586         tv.tv_usec = 200 * 1000;
1587         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1588         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1589         if (ret < 0)
1590                 goto repeat;
1591         if (audiod_status != AUDIOD_OFF)
1592                 audiod_status_dump();
1593         audiod_post_select(ret, &rfds, &wfds);
1594         /* read status pipe */
1595         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1596                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1597                 if (ret <= 0) {
1598                         close_stat_pipe();
1599                         /* avoid busy loop if server is down */
1600                         while (sleep(1) > 0)
1601                                 ; /* try again*/
1602                 } else {
1603                         status_buf[ret + sbo] = '\0';
1604                         sbo = for_each_line(status_buf, ret + sbo,
1605                                 &check_stat_line);
1606                 }
1607         }
1608         slot_io(&wfds);
1609         if (FD_ISSET(audiod_socket, &rfds)) {
1610                 ret = handle_connect();
1611                 if (ret < 0) {
1612                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1613                 }
1614         }
1615         /* signals */
1616         if (FD_ISSET(signal_pipe, &rfds)) {
1617                 int sig_nr = para_next_signal();
1618                 if (sig_nr > 0)
1619                         handle_signal(sig_nr);
1620         }
1621         goto repeat;
1622 }
1623
1624 static void set_initial_status(void)
1625 {
1626         audiod_status = AUDIOD_ON;
1627         if (!conf.mode_given)
1628                 return;
1629         if (!strcmp(conf.mode_arg, "sb")) {
1630                 audiod_status = AUDIOD_STANDBY;
1631                 return;
1632         }
1633         if (!strcmp(conf.mode_arg, "off")) {
1634                 audiod_status = AUDIOD_OFF;
1635                 return;
1636         }
1637         if (strcmp(conf.mode_arg, "on"))
1638                 PARA_WARNING_LOG("%s", "invalid mode\n");
1639 }
1640
1641 int __noreturn main(int argc, char *argv[])
1642 {
1643         char *cf;
1644         int i;
1645
1646         valid_fd_012();
1647         hostname = para_hostname();
1648         cmdline_parser(argc, argv, &conf);
1649         para_drop_privileges(conf.user_arg, conf.group_arg);
1650         cf = configfile_exists();
1651         if (cf) {
1652                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1653                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1654                         exit(EXIT_FAILURE);
1655                 }
1656         }
1657         if (conf.logfile_given)
1658                 logfile = open_log(conf.logfile_arg);
1659         log_welcome("para_audiod", conf.loglevel_arg);
1660         i = init_stream_io();
1661         if (i < 0) {
1662                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1663                 exit(EXIT_FAILURE);
1664         }
1665         server_uptime(UPTIME_SET);
1666         set_initial_status();
1667         FOR_EACH_SLOT(i)
1668                 clear_slot(i);
1669         init_grabbing();
1670         setup_signal_handling();
1671         if (conf.daemon_given)
1672                 daemon_init();
1673         audiod_get_socket(); /* doesn't return on errors */
1674         audiod_mainloop();
1675 }