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",
 613                 (long unsigned)tmp.tv_sec,
 614                 (long unsigned)tmp.tv_usec);
 615         ret = s_a_r(cmd, "STREAM_START", replacement);
 616         free(replacement);
 617         if (!ret)
 618                 goto out;
 619         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 620 out:
 621         return ret;
 622 }
 623
 624 /** get the number of filters for the given audio format */
 625 int num_filters(int audio_format_num)
 626 {
 627         return afi[audio_format_num].num_filters;
 628 }
 629
 630 static void open_filters(int slot_num)
 631 {
 632         struct slot_info *s = &slot[slot_num];
 633         struct audio_format_info *a = &afi[s->format];
 634         int nf = a->num_filters;
 635         int i;
 636
 637         s->fci = para_calloc(sizeof(struct filter_chain_info));
 638         INIT_LIST_HEAD(&s->fci->filters);
 639         if (!nf)
 640                 return;
 641         s->fci->inbuf = s->receiver_node->buf;
 642         s->fci->in_loaded = &s->receiver_node->loaded;
 643         s->fci->outbuf = s->receiver_node->buf;
 644         s->fci->out_loaded = &s->receiver_node->loaded;
 645         s->fci->eof = &s->receiver_node->eof;
 646         for (i = 0; i < nf; i++) {
 647                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 648                 fn->conf = a->filter_conf[i];
 649                 fn->fci = s->fci;
 650                 fn->filter = a->filters[i];
 651                 INIT_LIST_HEAD(&fn->callbacks);
 652                 list_add_tail(&fn->node, &s->fci->filters);
 653                 fn->filter->open(fn);
 654                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 655                         audio_formats[s->format], i + 1,  nf,
 656                         fn->filter->name, slot_num);
 657                 s->fci->outbuf = fn->buf;
 658                 s->fci->out_loaded = &fn->loaded;
 659         }
 660         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 661                 s->fci->outbuf);
 662 }
 663
 664 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 665 {
 666         struct filter_node *fn;
 667         int i, j;
 668
 669         FOR_EACH_SLOT(i) {
 670                 struct slot_info *s = &slot[i];
 671                 if (s->format < 0 || !s->fci)
 672                         continue;
 673                 if (slot_num >= 0 && slot_num != i)
 674                         continue;
 675                 if (format >= 0 && s->format != format)
 676                         continue;
 677                 if (num_filters(i) < filternum)
 678                         continue;
 679                 /* success */
 680                 j = 1;
 681                 list_for_each_entry(fn, &s->fci->filters, node)
 682                         if (filternum <= 0 || j++ == filternum)
 683                                 break;
 684                 return fn;
 685         }
 686         return NULL;
 687 }
 688
 689 static void start_stream_writer(int slot_num)
 690 {
 691         int ret, fds[3] = {1, -1, -1};
 692         struct slot_info *s = &slot[slot_num];
 693         struct audio_format_info *a = &afi[s->format];
 694         char *glob = NULL;
 695
 696         if (a->write_cmd)
 697                 glob = glob_cmd(a->write_cmd);
 698         if (!glob)
 699                 glob = para_strdup("para_play");
 700         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 701         open_filters(slot_num);
 702         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 703         free(glob);
 704         if (ret < 0) {
 705                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 706                 return;
 707         }
 708         s->write_fd = fds[0];
 709         add_close_on_fork_list(s->write_fd);
 710         /* we write to this fd in do_select, so we need non-blocking */
 711         mark_fd_nonblock(s->write_fd);
 712         gettimeofday(&s->wstime, NULL);
 713         current_decoder = slot_num;
 714         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 715 }
 716
 717 static void open_receiver(int format)
 718 {
 719         struct audio_format_info *a = &afi[format];
 720         struct slot_info *s;
 721         int ret, slot_num;
 722
 723         slot_num = get_empty_slot();
 724         if (slot_num < 0)
 725                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 726         s = &slot[slot_num];
 727         s->format = format;
 728         gettimeofday(&s->rtime, NULL);
 729         s->wtime = s->rtime;
 730         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 731         s->receiver_node->conf = a->receiver_conf;
 732         ret = a->receiver->open(s->receiver_node);
 733         if (ret < 0) {
 734                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 735                         PARA_STRERROR(-ret));
 736                 free(s->receiver_node);
 737                 s->receiver_node = NULL;
 738                 return;
 739         }
 740         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 741                 audio_formats[s->format], a->receiver->name, slot_num);
 742 }
 743
 744 static int is_frozen(int format)
 745 {
 746         struct timeval now;
 747         struct audio_format_info *a = &afi[format];
 748
 749         gettimeofday(&now, NULL);
 750         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 751 }
 752
 753 static void start_current_receiver(void)
 754 {
 755         int i;
 756
 757         if (!af_status)
 758                 return;
 759         i = get_audio_format_num(af_status);
 760         if (i < 0)
 761                 return;
 762         if ((decoder_running(i) & 1) || is_frozen(i))
 763                 return;
 764         open_receiver(i);
 765 }
 766
 767 static void compute_time_diff(const struct timeval *status_time)
 768 {
 769         struct timeval now, tmp, diff;
 770         static int count;
 771         int sign;
 772         const struct timeval max_deviation = {0, 500 * 1000};
 773         const int time_smooth = 5;
 774
 775         gettimeofday(&now, NULL);
 776         sign = tv_diff(status_time, &now, &diff);
 777 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 778 //                      sign, sa_time_diff_sign);
 779         if (!count) {
 780                 sa_time_diff_sign = sign;
 781                 sa_time_diff = diff;
 782                 count++;
 783                 return;
 784         }
 785         if (count > 5) {
 786                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 787                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 788                         PARA_WARNING_LOG("time diff jump: %lims\n",
 789                                 s * tv2ms(&tmp));
 790         }
 791         count++;
 792         sa_time_diff_sign = tv_convex_combination(
 793                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 794                 count > 10? sign : sign * time_smooth, &diff,
 795                 &tmp);
 796         sa_time_diff = tmp;
 797         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 798                 sign > 0? "+" : "-",
 799                 tv2ms(&diff),
 800                 sa_time_diff_sign ? "+" : "-",
 801                 tv2ms(&sa_time_diff)
 802         );
 803 }
 804
 805 static void check_stat_line(char *line)
 806 {
 807         int itemnum;
 808         size_t ilen = 0;
 809         long unsigned sec, usec;
 810         char *tmp;
 811
 812         PARA_INFO_LOG("line: %s\n", line);
 813         if (!line)
 814                 return;
 815         itemnum = stat_line_valid(line);
 816         if (itemnum < 0) {
 817                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 818                 return;
 819         }
 820         tmp = make_message("%s\n", line);
 821         stat_client_write(tmp, itemnum);
 822         free(tmp);
 823         free(stat_item_values[itemnum]);
 824         stat_item_values[itemnum] = para_strdup(line);
 825         ilen = strlen(status_item_list[itemnum]);
 826         switch (itemnum) {
 827         case SI_STATUS:
 828                 playing = strstr(line, "playing")? 1 : 0;
 829                 break;
 830         case SI_FORMAT:
 831                 free(af_status);
 832                 af_status = para_strdup(line + ilen + 1);
 833                 break;
 834         case SI_OFFSET:
 835                 offset_seconds = atoi(line + ilen + 1);
 836                 break;
 837         case SI_LENGTH:
 838                 length_seconds = atoi(line + ilen + 1);
 839                 break;
 840         case SI_STREAM_START:
 841                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 842                         server_stream_start.tv_sec = sec;
 843                         server_stream_start.tv_usec = usec;
 844                 }
 845                 break;
 846         case SI_CURRENT_TIME:
 847                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 848                         struct timeval tv = {sec, usec};
 849                         compute_time_diff(&tv);
 850                 }
 851                 break;
 852         }
 853 }
 854
 855 static void handle_signal(int sig)
 856 {
 857         switch (sig) {
 858         case SIGCHLD:
 859                 return check_sigchld();
 860         case SIGINT:
 861         case SIGTERM:
 862         case SIGHUP:
 863                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 864                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 865                 return;
 866         }
 867 }
 868
 869 static void check_timeouts(void)
 870 {
 871         struct timeval now;
 872         int slot_num, timeout = conf.stream_timeout_arg;
 873
 874         gettimeofday(&now, NULL);
 875         FOR_EACH_SLOT(slot_num) {
 876                 struct slot_info *s = &slot[slot_num];
 877                 if (s->format < 0)
 878                         continue;
 879                 /* check read time */
 880                 if (s->receiver_node &&
 881                         now.tv_sec > s->rtime.tv_sec + timeout) {
 882                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 883                                 audio_formats[s->format], slot_num);
 884                         if (s->fci)
 885                                 s->fci->error = 42;
 886                         else
 887                                 close_receiver(slot_num);
 888                 }
 889                 /* check write time */
 890                 if (s->wpid > 0 && !s->wkilled &&
 891                         now.tv_sec > s->wtime.tv_sec + timeout) {
 892                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 893                                 audio_formats[s->format], slot_num);
 894                         if (s->fci)
 895                                 s->fci->error = 42;
 896                 }
 897         }
 898 }
 899
 900 static size_t get_loaded_bytes(int slot_num)
 901 {
 902         size_t loaded = 0;
 903         struct slot_info *s = &slot[slot_num];
 904         struct receiver_node *rn = s->receiver_node;
 905
 906         if (s->format < 0)
 907                 goto out;
 908
 909         if (afi[s->format].num_filters) {
 910                 if (s->fci)
 911                         loaded = *s->fci->out_loaded;
 912         } else {
 913                 if (rn)
 914                         loaded = rn->loaded;
 915         }
 916 out:
 917         return loaded;
 918 }
 919
 920
 921 static void close_decoder_if_idle(int slot_num)
 922 {
 923         struct slot_info *s = &slot[slot_num];
 924         struct receiver_node *rn = s->receiver_node;
 925
 926         if (s->format < 0)
 927                 return;
 928         if (!s->fci)
 929                 return;
 930         if (!rn->eof && !s->fci->error && s->wpid > 0)
 931                 return;
 932         if (!s->fci->error && s->wpid > 0) { /* eof */
 933                 if (filter_io(s->fci) > 0)
 934                         return;
 935                 if (get_loaded_bytes(slot_num))
 936                         return;
 937         }
 938         if (s->write_fd > 0) {
 939                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 940                         s->write_fd);
 941                 close(s->write_fd);
 942                 del_close_on_fork_list(s->write_fd);
 943                 s->write_fd = -1;
 944         }
 945         if (s->wpid > 0)
 946                 return; /* wait until writer dies before closing filters */
 947         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 948                 slot_num, s->fci);
 949         close_filters(s->fci);
 950         free(s->fci);
 951         close_receiver(slot_num);
 952         clear_slot(slot_num);
 953 }
 954
 955 static void set_stream_fds(fd_set *wfds, int *max_fileno)
 956 {
 957         int i;
 958
 959         check_timeouts();
 960         FOR_EACH_SLOT(i) {
 961                 struct slot_info *s = &slot[i];
 962                 struct audio_format_info *a;
 963                 struct receiver_node *rn;
 964
 965                 close_decoder_if_idle(i);
 966                 s->wcheck = 0;
 967                 if (s->format < 0)
 968                         continue;
 969                 a = &afi[s->format];
 970                 rn = s->receiver_node;
 971                 if (rn && rn->loaded && !s->wpid) {
 972                         PARA_INFO_LOG("no writer in slot %d\n", i);
 973                         start_stream_writer(i);
 974                 }
 975                 if (s->write_fd <= 0)
 976                         continue;
 977                 if (!get_loaded_bytes(i))
 978                         continue;
 979                 para_fd_set(s->write_fd, wfds, max_fileno);
 980                 s->wcheck = 1;
 981         }
 982 }
 983
 984 static int write_audio_data(int slot_num)
 985 {
 986         struct slot_info *s = &slot[slot_num];
 987         struct audio_format_info *a = &afi[s->format];
 988         struct receiver_node *rn = s->receiver_node;
 989         int rv;
 990         char **buf;
 991         size_t *len;
 992
 993         if (a->num_filters) {
 994                 buf = &s->fci->outbuf;
 995                 len = s->fci->out_loaded;
 996         } else {
 997                 buf = &rn->buf;
 998                 len = &rn->loaded;
 999         }
1000         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1001         rv = write(s->write_fd, *buf, *len);
1002         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1003         if (rv < 0) {
1004                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1005                         slot_num, s->write_fd, strerror(errno));
1006                 *len = 0;
1007                 s->fci->error = E_WRITE_AUDIO_DATA;
1008         } else if (rv != *len) {
1009                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1010                         audio_formats[s->format], rv, *len, slot_num);
1011                 *len -= rv;
1012                 memmove(*buf, *buf + rv, *len);
1013         } else
1014                 *len = 0;
1015         if (rv > 0)
1016                 gettimeofday(&s->wtime, NULL);
1017         return rv;
1018 }
1019
1020 static void slot_io(fd_set *wfds)
1021 {
1022         int ret, i;
1023
1024         FOR_EACH_SLOT(i) {
1025                 struct slot_info *s = &slot[i];
1026                 struct receiver_node *rn = s->receiver_node;
1027
1028                 if (rn && rn->loaded)
1029                         gettimeofday(&s->rtime, NULL);
1030                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1031                         ret = filter_io(s->fci);
1032                         if (ret < 0)
1033                                 s->fci->error = -ret;
1034 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1035 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1036                 }
1037                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1038                         continue;
1039                 write_audio_data(i);
1040         }
1041 }
1042
1043 static int parse_stream_command(const char *txt, char **cmd)
1044 {
1045         char *p = strchr(txt, ':');
1046         int i;
1047
1048         if (!p)
1049                 return -E_MISSING_COLON;
1050         p++;
1051         FOR_EACH_AUDIO_FORMAT(i) {
1052                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1053                         continue;
1054                 *cmd = p;
1055                 return i;
1056         }
1057         return -E_UNSUPPORTED_AUDIO_FORMAT;
1058 }
1059
1060 static int add_filter(int format, char *cmdline)
1061 {
1062         struct audio_format_info *a = &afi[format];
1063         int filter_num, nf = a->num_filters;
1064
1065         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1066         if (filter_num < 0)
1067                 return filter_num;
1068         a->filters[nf] = &filters[filter_num];
1069         a->num_filters++;
1070         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1071                 a->filters[nf]->name);
1072         return filter_num;
1073 }
1074
1075 static int setup_default_filters(void)
1076 {
1077         int i, ret = 1;
1078
1079         FOR_EACH_AUDIO_FORMAT(i) {
1080                 struct audio_format_info *a = &afi[i];
1081                 char *tmp;
1082                 int j;
1083                 if (a->num_filters)
1084                         continue;
1085                 /* add "dec" to audio format name */
1086                 tmp = make_message("%sdec", audio_formats[i]);
1087                 for (j = 0; filters[j].name; j++)
1088                         if (!strcmp(tmp, filters[j].name))
1089                                 break;
1090                 free(tmp);
1091                 ret = -E_UNSUPPORTED_FILTER;
1092                 if (!filters[j].name)
1093                         goto out;
1094                 tmp = para_strdup(filters[j].name);
1095                 ret = add_filter(i, tmp);
1096                 free(tmp);
1097                 if (ret < 0)
1098                         goto out;
1099                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1100                 ret = add_filter(i, para_strdup("wav"));
1101                 if (ret < 0)
1102                         goto out;
1103                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1104         }
1105 out:
1106         return ret;
1107 }
1108
1109 static int init_stream_io(void)
1110 {
1111         int i, ret, receiver_num, nf;
1112         char *cmd;
1113
1114         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1115                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1116                 if (ret < 0)
1117                         goto out;
1118                 afi[ret].write_cmd = para_strdup(cmd);
1119                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1120         }
1121         for (i = 0; receivers[i].name; i++) {
1122                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1123                 receivers[i].init(&receivers[i]);
1124         }
1125         for (i = 0; i < conf.receiver_given; i++) {
1126                 char *arg = conf.receiver_arg[i];
1127                 char *recv = strchr(arg, ':');
1128                 ret = -E_MISSING_COLON;
1129                 if (!recv)
1130                         goto out;
1131                 *recv = '\0';
1132                 recv++;
1133                 ret = get_audio_format_num(arg);
1134                 if (ret < 0)
1135                         goto out;
1136                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1137                 if (!afi[ret].receiver_conf) {
1138                         ret = -E_RECV_SYNTAX;
1139                         goto out;
1140                 }
1141                 afi[ret].receiver = &receivers[receiver_num];
1142         }
1143         /* use the first available receiver with no arguments
1144          * for those audio formats for which no receiver
1145          * was specified
1146          */
1147         cmd = para_strdup(receivers[0].name);
1148         FOR_EACH_AUDIO_FORMAT(i) {
1149                 struct audio_format_info *a = &afi[i];
1150                 if (a->receiver_conf)
1151                         continue;
1152                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1153                 if (!a->receiver_conf)
1154                         return -E_RECV_SYNTAX;
1155                 a->receiver = &receivers[receiver_num];
1156         }
1157         free(cmd);
1158         /* filters */
1159         filter_init(filters);
1160         nf = PARA_MAX(2,  conf.filter_given) + 1;
1161         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1162         FOR_EACH_AUDIO_FORMAT(i) {
1163                 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1164                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1165         }
1166         if (!conf.no_default_filters_given)
1167                 return setup_default_filters();
1168         for (i = 0; i < conf.filter_given; i++) {
1169                 char *arg = conf.filter_arg[i];
1170                 char *filter_name = strchr(arg, ':');
1171                 ret = -E_MISSING_COLON;
1172                 if (!filter_name)
1173                         goto out;
1174                 *filter_name = '\0';
1175                 filter_name++;
1176                 ret = get_audio_format_num(arg);
1177                 if (ret < 0)
1178                         goto out;
1179                 ret = add_filter(ret, filter_name);
1180                 if (ret < 0)
1181                         goto out;
1182         }
1183         ret = 1;
1184 out:
1185         return ret;
1186 }
1187
1188 static int dump_commands(int fd)
1189 {
1190         char *buf = para_strdup(""), *tmp = NULL;
1191         int i;
1192         ssize_t ret;
1193
1194         FOR_EACH_COMMAND(i) {
1195                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1196                         cmds[i].description);
1197                 free(buf);
1198                 buf = tmp;
1199         }
1200         ret = client_write(fd, buf);
1201         free(buf);
1202         return ret;
1203 }
1204
1205 /*
1206  * command handlers don't close their fd on errors (ret < 0) so that
1207  * its caller can send an error message. Otherwise (ret >= 0) it's up
1208  * to each individual command to close the fd if necessary.
1209  */
1210
1211 static int com_help(int fd, int argc, char **argv)
1212 {
1213         int i, ret;
1214         char *buf;
1215         const char *dflt = "No such command. Available commands:\n";
1216
1217         if (argc < 2) {
1218                 ret = dump_commands(fd);
1219                 goto out;
1220         }
1221         FOR_EACH_COMMAND(i) {
1222                 if (strcmp(cmds[i].name, argv[1]))
1223                         continue;
1224                 buf = make_message(
1225                         "NAME\n\t%s -- %s\n"
1226                         "SYNOPSIS\n\tpara_audioc %s\n"
1227                         "DESCRIPTION\n%s\n",
1228                         argv[1],
1229                         cmds[i].description,
1230                         cmds[i].synopsis,
1231                         cmds[i].help
1232                 );
1233                 ret = client_write(fd, buf);
1234                 free(buf);
1235                 goto out;
1236         }
1237         ret = client_write(fd, dflt);
1238         if (ret > 0)
1239                 ret = dump_commands(fd);
1240 out:
1241         if (ret >= 0)
1242                 close(fd);
1243         return ret;
1244 }
1245
1246 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1247 {
1248         int i, ret;
1249         char *buf = NULL;
1250         long unsigned mask = ~0LU;
1251
1252         if (argc > 1) {
1253                 mask = 0;
1254                 for (i = 1; i < argc; i++) {
1255                         ret = stat_item_valid(argv[i]);
1256                         if (ret < 0)
1257                                 return ret;
1258                         mask |= (1 << ret);
1259                 }
1260         }
1261         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1262         if (mask & (1 << SI_PLAY_TIME)) {
1263                 struct timeval *t = wstime();
1264                 char *ts = get_time_string(t);
1265                 if (ts) {
1266                         ret = client_write(fd, ts);
1267                         if (ret < 0)
1268                                 goto out;
1269                         free(ts);
1270                 }
1271         }
1272         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1273                 char *tmp, *us = uptime_str();
1274                 tmp = make_message("%s:%s\n",
1275                         status_item_list[SI_AUDIOD_UPTIME], us);
1276                 free(us);
1277                 ret = client_write(fd, tmp);
1278                 if (ret < 0)
1279                         goto out;
1280                 free(tmp);
1281         }
1282         if (mask & (1 << SI_AUDIOD_STATUS)) {
1283                 char *s = audiod_status_string();
1284                 ret = client_write(fd, s);
1285                 if (ret < 0)
1286                         goto out;
1287                 free(s);
1288         }
1289         if (mask & (1 << SI_DECODER_FLAGS)) {
1290                 char *df =decoder_flags();
1291                 ret = client_write(fd, df);
1292                 if (ret < 0)
1293                         goto out;
1294                 free(df);
1295         }
1296
1297         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1298                 char *tmp, *v;
1299                 if (!((1 << i) & mask))
1300                         continue;
1301                 v = stat_item_values[i];
1302                 tmp = make_message("%s%s%s", buf? buf: "",
1303                         v? v : "", v? "\n" : "");
1304                 free(buf);
1305                 buf = tmp;
1306         }
1307         ret = client_write(fd, buf);
1308 out:
1309         if (ret > 0)
1310                 ret = stat_client_add(fd, mask);
1311         free(buf);
1312         return ret;
1313 }
1314
1315 #if 0
1316 static char *list_filters(void)
1317 {
1318         int i, j;
1319         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1320
1321         FOR_EACH_AUDIO_FORMAT(i) {
1322                 for (j = 0; j < afi[i].num_filters; j++) {
1323                         tmp = make_message("%s\t%i\t%s\n",
1324                                 afi[i].name, j, afi[i].filter_cmds[j]);
1325                         msg = para_strcat(msg, tmp);
1326                         free(tmp);
1327                 }
1328                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1329                         j, afi[i].write_cmd);
1330                 msg = para_strcat(msg, tmp);
1331                 free(tmp);
1332         }
1333         return msg;
1334 }
1335 #endif
1336
1337 static int com_grab(int fd, int argc, char **argv)
1338 {
1339         struct grab_client *gc;
1340         struct filter_node *fn;
1341         int i, err;
1342         char *msg;
1343
1344         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1345         gc = grab_client_new(fd, argc, argv, &err);
1346         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1347         if (!gc)
1348                 goto err_out;
1349         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1350         if (fn)
1351                 activate_grab_client(gc, fn);
1352         return 1;
1353 err_out:
1354         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1355                 return err;
1356         if (err == -E_GC_HELP_GIVEN) {
1357                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1358                 for (i = 0; grab_client_args_info_help[i]; i++) {
1359                         char *tmp = make_message("%s%s\n", msg,
1360                                 grab_client_args_info_help[i]);
1361                         free(msg);
1362                         msg = tmp;
1363                 }
1364         } else
1365                 msg = make_message("%s %s\n",
1366                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1367                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1368         err = client_write(fd, msg);
1369         free(msg);
1370         if (err < 0)
1371                 return err;
1372         close(fd);
1373         return 1;
1374 }
1375
1376 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1377 {
1378         close(fd);
1379         clean_exit(EXIT_SUCCESS, "terminating on user request");
1380 }
1381
1382 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1383 {
1384         audiod_status = AUDIOD_ON;
1385         close(fd);
1386         return 1;
1387 }
1388
1389 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1390 {
1391         audiod_status = AUDIOD_OFF;
1392         close(fd);
1393         return 1;
1394 }
1395
1396 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1397 {
1398         audiod_status = AUDIOD_STANDBY;
1399         close(fd);
1400         return 1;
1401 }
1402
1403 static int com_cycle(int fd, int argc, char **argv)
1404 {
1405         switch (audiod_status) {
1406                 case  AUDIOD_ON:
1407                         return com_sb(fd, argc, argv);
1408                         break;
1409                 case  AUDIOD_OFF:
1410                         return com_on(fd, argc, argv);
1411                         break;
1412                 case  AUDIOD_STANDBY:
1413                         return com_off(fd, argc, argv);
1414                         break;
1415         }
1416         close(fd);
1417         return 1;
1418 }
1419
1420 static int check_perms(uid_t uid)
1421 {
1422         int i;
1423
1424         if (!conf.user_allow_given)
1425                 return 1;
1426         for (i = 0; i < conf.user_allow_given; i++)
1427                 if (uid == conf.user_allow_arg[i])
1428                         return 1;
1429         return -E_UCRED_PERM;
1430 }
1431
1432 static int handle_connect(void)
1433 {
1434         int i, argc, ret, clifd = -1;
1435         char *buf = para_malloc(MAXLINE), **argv = NULL;
1436         struct sockaddr_un unix_addr;
1437
1438         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1439         if (ret < 0)
1440                 goto out;
1441         clifd = ret;
1442         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1443         if (ret < 0)
1444                 goto out;
1445         PARA_INFO_LOG("connection from user %i\n",  ret);
1446         ret = check_perms(ret);
1447         if (ret < 0)
1448                 goto out;
1449         argc = split_args(buf, &argv, "\n");
1450         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1451         for (i = 0; cmds[i].name; i++) {
1452                 if (strcmp(cmds[i].name, argv[0]))
1453                         continue;
1454                 ret = cmds[i].handler(clifd, argc, argv);
1455                 goto out;
1456         }
1457         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1458 out:
1459         free(buf);
1460         free(argv);
1461         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1462                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1463                 client_write(clifd, tmp);
1464                 free(tmp);
1465                 close(clifd);
1466         }
1467         return ret;
1468 }
1469
1470 static void audiod_get_socket(void)
1471 {
1472         struct sockaddr_un unix_addr;
1473
1474         if (conf.socket_given)
1475                 socket_name = para_strdup(conf.socket_arg);
1476         else {
1477                 char *hn = para_hostname();
1478                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1479                         hn);
1480                 free(hn);
1481         }
1482         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1483         if (conf.force_given)
1484                 unlink(socket_name);
1485         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1486                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1487         if (audiod_socket < 0) {
1488                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1489                 exit(EXIT_FAILURE); /* do not unlink socket */
1490         }
1491         if (listen(audiod_socket, 5) < 0) {
1492                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1493                 exit(EXIT_FAILURE); /* do not unlink socket */
1494         }
1495         add_close_on_fork_list(audiod_socket);
1496 }
1497
1498 static int open_stat_pipe(void)
1499 {
1500         int ret, fd[3] = {-1, 1, 0};
1501         pid_t pid;
1502         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1503         if (ret >= 0) {
1504                 ret = fd[1];
1505                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1506                 add_close_on_fork_list(ret);
1507         } else
1508                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1509         return ret;
1510 }
1511
1512 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1513                 int *max_fileno)
1514 {
1515         int i, ret;
1516
1517         FOR_EACH_SLOT(i) {
1518                 struct slot_info *s = &slot[i];
1519                 struct audio_format_info *a;
1520                 struct receiver_node *rn = s->receiver_node;
1521                 if (s->format < 0 || !rn)
1522                         continue;
1523                 a = &afi[s->format];
1524                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1525 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1526                 *max_fileno = PARA_MAX(*max_fileno, ret);
1527         }
1528 }
1529 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1530 {
1531         int i, ret;
1532
1533         FOR_EACH_SLOT(i) {
1534                 struct slot_info *s = &slot[i];
1535                 struct audio_format_info *a;
1536                 struct receiver_node *rn = s->receiver_node;
1537                 if (s->format < 0 || !rn || rn->eof)
1538                         continue;
1539                 a = &afi[s->format];
1540                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1541                 if (ret <= 0) {
1542                         if (ret)
1543                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1544                                 a->receiver->name, PARA_STRERROR(-ret), i);
1545                         else
1546                                 PARA_INFO_LOG("eof in slot %d\n", i);
1547                         rn->eof = 1;
1548                 }
1549                 if (ret < 0 && s->fci)
1550                         s->fci->error = ret;
1551         }
1552 }
1553
1554 /* TODO: move everything before the select call to pre_select() */
1555 static void __noreturn audiod_mainloop(void)
1556 {
1557         fd_set rfds, wfds;
1558         int ret, max_fileno, sbo = 0;
1559         char status_buf[STRINGSIZE] = "";
1560         struct timeval tv;
1561 repeat:
1562         FD_ZERO(&wfds);
1563         FD_ZERO(&rfds);
1564         /* always check signal pipe and the local socket */
1565         FD_SET(signal_pipe, &rfds);
1566         max_fileno = signal_pipe;
1567         para_fd_set(audiod_socket, &rfds, &max_fileno);
1568
1569         if (audiod_status != AUDIOD_ON)
1570                 kill_all_decoders();
1571         else if (playing)
1572                 start_current_receiver();
1573
1574         set_stream_fds(&wfds, &max_fileno);
1575         /* status pipe */
1576         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1577                 close_stat_pipe();
1578         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1579                 stat_pipe = open_stat_pipe();
1580                 sbo = 0;
1581                 status_buf[0] = '\0';
1582         }
1583         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1584                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1585         /* local socket */
1586         tv.tv_sec = 0;
1587         tv.tv_usec = 200 * 1000;
1588         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1589         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1590         if (ret < 0)
1591                 goto repeat;
1592         if (audiod_status != AUDIOD_OFF)
1593                 audiod_status_dump();
1594         audiod_post_select(ret, &rfds, &wfds);
1595         /* read status pipe */
1596         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1597                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1598                 if (ret <= 0) {
1599                         close_stat_pipe();
1600                         /* avoid busy loop if server is down */
1601                         while (sleep(1) > 0)
1602                                 ; /* try again*/
1603                 } else {
1604                         status_buf[ret + sbo] = '\0';
1605                         sbo = for_each_line(status_buf, ret + sbo,
1606                                 &check_stat_line);
1607                 }
1608         }
1609         slot_io(&wfds);
1610         if (FD_ISSET(audiod_socket, &rfds)) {
1611                 ret = handle_connect();
1612                 if (ret < 0) {
1613                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1614                 }
1615         }
1616         /* signals */
1617         if (FD_ISSET(signal_pipe, &rfds)) {
1618                 int sig_nr = para_next_signal();
1619                 if (sig_nr > 0)
1620                         handle_signal(sig_nr);
1621         }
1622         goto repeat;
1623 }
1624
1625 static void set_initial_status(void)
1626 {
1627         audiod_status = AUDIOD_ON;
1628         if (!conf.mode_given)
1629                 return;
1630         if (!strcmp(conf.mode_arg, "sb")) {
1631                 audiod_status = AUDIOD_STANDBY;
1632                 return;
1633         }
1634         if (!strcmp(conf.mode_arg, "off")) {
1635                 audiod_status = AUDIOD_OFF;
1636                 return;
1637         }
1638         if (strcmp(conf.mode_arg, "on"))
1639                 PARA_WARNING_LOG("%s", "invalid mode\n");
1640 }
1641
1642 int __noreturn main(int argc, char *argv[])
1643 {
1644         char *cf;
1645         int i;
1646
1647         fprintf(stderr, "argc: %d\n", argc);
1648         valid_fd_012();
1649         hostname = para_hostname();
1650         cmdline_parser(argc, argv, &conf);
1651         para_drop_privileges(conf.user_arg, conf.group_arg);
1652         cf = configfile_exists();
1653         if (cf) {
1654                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1655                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1656                         exit(EXIT_FAILURE);
1657                 }
1658         }
1659         if (conf.logfile_given)
1660                 logfile = open_log(conf.logfile_arg);
1661         log_welcome("para_audiod", conf.loglevel_arg);
1662         i = init_stream_io();
1663         if (i < 0) {
1664                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1665                 exit(EXIT_FAILURE);
1666         }
1667         server_uptime(UPTIME_SET);
1668         set_initial_status();
1669         FOR_EACH_SLOT(i)
1670                 clear_slot(i);
1671         init_grabbing();
1672         setup_signal_handling();
1673         if (conf.daemon_given)
1674                 daemon_init();
1675         audiod_get_socket(); /* doesn't return on errors */
1676         audiod_mainloop();
1677 }