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): %s%lums/%s%lums\n",
 801                 sign > 0? "+" : "-",
 802                 tv2ms(&diff),
 803                 sa_time_diff_sign ? "+" : "-",
 804                 tv2ms(&sa_time_diff)
 805         );
 806 }
 807
 808 static void check_stat_line(char *line)
 809 {
 810         int itemnum;
 811         size_t ilen = 0;
 812         struct timeval tv;
 813         char *tmp;
 814
 815         PARA_INFO_LOG("line: %s\n", line);
 816         if (!line)
 817                 return;
 818         itemnum = stat_line_valid(line);
 819         if (itemnum < 0) {
 820                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 821                 return;
 822         }
 823         tmp = make_message("%s\n", line);
 824         stat_client_write(tmp, itemnum);
 825         free(tmp);
 826         free(stat_item_values[itemnum]);
 827         stat_item_values[itemnum] = para_strdup(line);
 828         ilen = strlen(status_item_list[itemnum]);
 829         switch (itemnum) {
 830         case SI_STATUS:
 831                 playing = strstr(line, "playing")? 1 : 0;
 832                 break;
 833         case SI_FORMAT:
 834                 free(af_status);
 835                 af_status = para_strdup(line + ilen + 1);
 836                 break;
 837         case SI_OFFSET:
 838                 offset_seconds = atoi(line + ilen + 1);
 839                 break;
 840         case SI_LENGTH:
 841                 length_seconds = atoi(line + ilen + 1);
 842                 break;
 843         case SI_STREAM_START:
 844                 if (sscanf(line + ilen + 1, "%lu.%lu",
 845                                 &tv.tv_sec, &tv.tv_usec) == 2)
 846                         server_stream_start = tv;
 847                 break;
 848         case SI_CURRENT_TIME:
 849                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 850                                 &tv.tv_usec) == 2)
 851                         compute_time_diff(&tv);
 852                 break;
 853         }
 854 }
 855
 856 static void handle_signal(int sig)
 857 {
 858         switch (sig) {
 859         case SIGCHLD:
 860                 return check_sigchld();
 861         case SIGINT:
 862         case SIGTERM:
 863         case SIGHUP:
 864                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 865                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 866                 return;
 867         }
 868 }
 869
 870 static void check_timeouts(void)
 871 {
 872         struct timeval now;
 873         int slot_num, timeout = conf.stream_timeout_arg;
 874
 875         gettimeofday(&now, NULL);
 876         FOR_EACH_SLOT(slot_num) {
 877                 struct slot_info *s = &slot[slot_num];
 878                 if (s->format < 0)
 879                         continue;
 880                 /* check read time */
 881                 if (s->receiver_node &&
 882                         now.tv_sec > s->rtime.tv_sec + timeout) {
 883                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 884                                 audio_formats[s->format], slot_num);
 885                         if (s->fci)
 886                                 s->fci->error = 42;
 887                         else
 888                                 close_receiver(slot_num);
 889                 }
 890                 /* check write time */
 891                 if (s->wpid > 0 && !s->wkilled &&
 892                         now.tv_sec > s->wtime.tv_sec + timeout) {
 893                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 894                                 audio_formats[s->format], slot_num);
 895                         if (s->fci)
 896                                 s->fci->error = 42;
 897                 }
 898         }
 899 }
 900
 901 static size_t get_loaded_bytes(int slot_num)
 902 {
 903         size_t loaded = 0;
 904         struct slot_info *s = &slot[slot_num];
 905         struct receiver_node *rn = s->receiver_node;
 906
 907         if (s->format < 0)
 908                 goto out;
 909
 910         if (afi[s->format].num_filters) {
 911                 if (s->fci)
 912                         loaded = *s->fci->out_loaded;
 913         } else {
 914                 if (rn)
 915                         loaded = rn->loaded;
 916         }
 917 out:
 918         return loaded;
 919 }
 920
 921
 922 static void close_decoder_if_idle(int slot_num)
 923 {
 924         struct slot_info *s = &slot[slot_num];
 925         struct receiver_node *rn = s->receiver_node;
 926
 927         if (s->format < 0)
 928                 return;
 929         if (!s->fci)
 930                 return;
 931         if (!rn->eof && !s->fci->error && s->wpid > 0)
 932                 return;
 933         if (!s->fci->error && s->wpid > 0) { /* eof */
 934                 if (filter_io(s->fci) > 0)
 935                         return;
 936                 if (get_loaded_bytes(slot_num))
 937                         return;
 938         }
 939         if (s->write_fd > 0) {
 940                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 941                         s->write_fd);
 942                 close(s->write_fd);
 943                 del_close_on_fork_list(s->write_fd);
 944                 s->write_fd = -1;
 945         }
 946         if (s->wpid > 0)
 947                 return; /* wait until writer dies before closing filters */
 948         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 949                 slot_num, s->fci);
 950         close_filters(s->fci);
 951         free(s->fci);
 952         close_receiver(slot_num);
 953         clear_slot(slot_num);
 954 }
 955
 956 static void set_stream_fds(fd_set *wfds, int *max_fileno)
 957 {
 958         int i;
 959
 960         check_timeouts();
 961         FOR_EACH_SLOT(i) {
 962                 struct slot_info *s = &slot[i];
 963                 struct audio_format_info *a;
 964                 struct receiver_node *rn;
 965
 966                 close_decoder_if_idle(i);
 967                 s->wcheck = 0;
 968                 if (s->format < 0)
 969                         continue;
 970                 a = &afi[s->format];
 971                 rn = s->receiver_node;
 972                 if (rn && rn->loaded && !s->wpid) {
 973                         PARA_INFO_LOG("no writer in slot %d\n", i);
 974                         start_stream_writer(i);
 975                 }
 976                 if (s->write_fd <= 0)
 977                         continue;
 978                 if (!get_loaded_bytes(i))
 979                         continue;
 980                 para_fd_set(s->write_fd, wfds, max_fileno);
 981                 s->wcheck = 1;
 982         }
 983 }
 984
 985 static int write_audio_data(int slot_num)
 986 {
 987         struct slot_info *s = &slot[slot_num];
 988         struct audio_format_info *a = &afi[s->format];
 989         struct receiver_node *rn = s->receiver_node;
 990         int rv;
 991         char **buf;
 992         size_t *len;
 993
 994         if (a->num_filters) {
 995                 buf = &s->fci->outbuf;
 996                 len = s->fci->out_loaded;
 997         } else {
 998                 buf = &rn->buf;
 999                 len = &rn->loaded;
1000         }
1001         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1002         rv = write(s->write_fd, *buf, *len);
1003         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1004         if (rv < 0) {
1005                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1006                         slot_num, s->write_fd, strerror(errno));
1007                 *len = 0;
1008                 s->fci->error = E_WRITE_AUDIO_DATA;
1009         } else if (rv != *len) {
1010                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1011                         audio_formats[s->format], rv, *len, slot_num);
1012                 *len -= rv;
1013                 memmove(*buf, *buf + rv, *len);
1014         } else
1015                 *len = 0;
1016         if (rv > 0)
1017                 gettimeofday(&s->wtime, NULL);
1018         return rv;
1019 }
1020
1021 static void slot_io(fd_set *wfds)
1022 {
1023         int ret, i;
1024
1025         FOR_EACH_SLOT(i) {
1026                 struct slot_info *s = &slot[i];
1027                 struct receiver_node *rn = s->receiver_node;
1028
1029                 if (rn && rn->loaded)
1030                         gettimeofday(&s->rtime, NULL);
1031                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1032                         ret = filter_io(s->fci);
1033                         if (ret < 0)
1034                                 s->fci->error = -ret;
1035 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1036 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1037                 }
1038                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1039                         continue;
1040                 write_audio_data(i);
1041         }
1042 }
1043
1044 static int parse_stream_command(const char *txt, char **cmd)
1045 {
1046         char *p = strchr(txt, ':');
1047         int i;
1048
1049         if (!p)
1050                 return -E_MISSING_COLON;
1051         p++;
1052         FOR_EACH_AUDIO_FORMAT(i) {
1053                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1054                         continue;
1055                 *cmd = p;
1056                 return i;
1057         }
1058         return -E_UNSUPPORTED_AUDIO_FORMAT;
1059 }
1060
1061 static int add_filter(int format, char *cmdline)
1062 {
1063         struct audio_format_info *a = &afi[format];
1064         int filter_num, nf = a->num_filters;
1065
1066         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1067         if (filter_num < 0)
1068                 return filter_num;
1069         a->filters[nf] = &filters[filter_num];
1070         a->num_filters++;
1071         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1072                 a->filters[nf]->name);
1073         return filter_num;
1074 }
1075
1076 static int setup_default_filters(void)
1077 {
1078         int i, ret = 1;
1079
1080         FOR_EACH_AUDIO_FORMAT(i) {
1081                 struct audio_format_info *a = &afi[i];
1082                 char *tmp;
1083                 int j;
1084                 if (a->num_filters)
1085                         continue;
1086                 /* add "dec" to audio format name */
1087                 tmp = make_message("%sdec", audio_formats[i]);
1088                 for (j = 0; filters[j].name; j++)
1089                         if (!strcmp(tmp, filters[j].name))
1090                                 break;
1091                 free(tmp);
1092                 ret = -E_UNSUPPORTED_FILTER;
1093                 if (!filters[j].name)
1094                         goto out;
1095                 tmp = para_strdup(filters[j].name);
1096                 ret = add_filter(i, tmp);
1097                 free(tmp);
1098                 if (ret < 0)
1099                         goto out;
1100                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1101                 ret = add_filter(i, para_strdup("wav"));
1102                 if (ret < 0)
1103                         goto out;
1104                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1105         }
1106 out:
1107         return ret;
1108 }
1109
1110 static int init_stream_io(void)
1111 {
1112         int i, ret, receiver_num, nf;
1113         char *cmd;
1114
1115         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1116                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1117                 if (ret < 0)
1118                         goto out;
1119                 afi[ret].write_cmd = para_strdup(cmd);
1120                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1121         }
1122         for (i = 0; receivers[i].name; i++) {
1123                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1124                 receivers[i].init(&receivers[i]);
1125         }
1126         for (i = 0; i < conf.receiver_given; i++) {
1127                 char *arg = conf.receiver_arg[i];
1128                 char *recv = strchr(arg, ':');
1129                 ret = -E_MISSING_COLON;
1130                 if (!recv)
1131                         goto out;
1132                 *recv = '\0';
1133                 recv++;
1134                 ret = get_audio_format_num(arg);
1135                 if (ret < 0)
1136                         goto out;
1137                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1138                 if (!afi[ret].receiver_conf) {
1139                         ret = -E_RECV_SYNTAX;
1140                         goto out;
1141                 }
1142                 afi[ret].receiver = &receivers[receiver_num];
1143         }
1144         /* use the first available receiver with no arguments
1145          * for those audio formats for which no receiver
1146          * was specified
1147          */
1148         cmd = para_strdup(receivers[0].name);
1149         FOR_EACH_AUDIO_FORMAT(i) {
1150                 struct audio_format_info *a = &afi[i];
1151                 if (a->receiver_conf)
1152                         continue;
1153                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1154                 if (!a->receiver_conf)
1155                         return -E_RECV_SYNTAX;
1156                 a->receiver = &receivers[receiver_num];
1157         }
1158         free(cmd);
1159         /* filters */
1160         filter_init(filters);
1161         nf = PARA_MAX(2,  conf.filter_given) + 1;
1162         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1163         FOR_EACH_AUDIO_FORMAT(i) {
1164                 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1165                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1166         }
1167         if (!conf.no_default_filters_given)
1168                 return setup_default_filters();
1169         for (i = 0; i < conf.filter_given; i++) {
1170                 char *arg = conf.filter_arg[i];
1171                 char *filter_name = strchr(arg, ':');
1172                 ret = -E_MISSING_COLON;
1173                 if (!filter_name)
1174                         goto out;
1175                 *filter_name = '\0';
1176                 filter_name++;
1177                 ret = get_audio_format_num(arg);
1178                 if (ret < 0)
1179                         goto out;
1180                 ret = add_filter(ret, filter_name);
1181                 if (ret < 0)
1182                         goto out;
1183         }
1184         ret = 1;
1185 out:
1186         return ret;
1187 }
1188
1189 static int dump_commands(int fd)
1190 {
1191         char *buf = para_strdup(""), *tmp = NULL;
1192         int i;
1193         ssize_t ret;
1194
1195         FOR_EACH_COMMAND(i) {
1196                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1197                         cmds[i].description);
1198                 free(buf);
1199                 buf = tmp;
1200         }
1201         ret = client_write(fd, buf);
1202         free(buf);
1203         return ret;
1204 }
1205
1206 /*
1207  * command handlers don't close their fd on errors (ret < 0) so that
1208  * its caller can send an error message. Otherwise (ret >= 0) it's up
1209  * to each individual command to close the fd if necessary.
1210  */
1211
1212 static int com_help(int fd, int argc, char **argv)
1213 {
1214         int i, ret;
1215         char *buf;
1216         const char *dflt = "No such command. Available commands:\n";
1217
1218         if (argc < 2) {
1219                 ret = dump_commands(fd);
1220                 goto out;
1221         }
1222         FOR_EACH_COMMAND(i) {
1223                 if (strcmp(cmds[i].name, argv[1]))
1224                         continue;
1225                 buf = make_message(
1226                         "NAME\n\t%s -- %s\n"
1227                         "SYNOPSIS\n\tpara_audioc %s\n"
1228                         "DESCRIPTION\n%s\n",
1229                         argv[1],
1230                         cmds[i].description,
1231                         cmds[i].synopsis,
1232                         cmds[i].help
1233                 );
1234                 ret = client_write(fd, buf);
1235                 free(buf);
1236                 goto out;
1237         }
1238         ret = client_write(fd, dflt);
1239         if (ret > 0)
1240                 ret = dump_commands(fd);
1241 out:
1242         if (ret >= 0)
1243                 close(fd);
1244         return ret;
1245 }
1246
1247 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1248 {
1249         int i, ret;
1250         char *buf = NULL;
1251         long unsigned mask = ~0LU;
1252
1253         if (argc > 1) {
1254                 mask = 0;
1255                 for (i = 1; i < argc; i++) {
1256                         ret = stat_item_valid(argv[i]);
1257                         if (ret < 0)
1258                                 return ret;
1259                         mask |= (1 << ret);
1260                 }
1261         }
1262         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1263         if (mask & (1 << SI_PLAY_TIME)) {
1264                 struct timeval *t = wstime();
1265                 char *ts = get_time_string(t);
1266                 if (ts) {
1267                         ret = client_write(fd, ts);
1268                         if (ret < 0)
1269                                 goto out;
1270                         free(ts);
1271                 }
1272         }
1273         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1274                 char *tmp, *us = uptime_str();
1275                 tmp = make_message("%s:%s\n",
1276                         status_item_list[SI_AUDIOD_UPTIME], us);
1277                 free(us);
1278                 ret = client_write(fd, tmp);
1279                 if (ret < 0)
1280                         goto out;
1281                 free(tmp);
1282         }
1283         if (mask & (1 << SI_AUDIOD_STATUS)) {
1284                 char *s = audiod_status_string();
1285                 ret = client_write(fd, s);
1286                 if (ret < 0)
1287                         goto out;
1288                 free(s);
1289         }
1290         if (mask & (1 << SI_DECODER_FLAGS)) {
1291                 char *df =decoder_flags();
1292                 ret = client_write(fd, df);
1293                 if (ret < 0)
1294                         goto out;
1295                 free(df);
1296         }
1297
1298         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1299                 char *tmp, *v;
1300                 if (!((1 << i) & mask))
1301                         continue;
1302                 v = stat_item_values[i];
1303                 tmp = make_message("%s%s%s", buf? buf: "",
1304                         v? v : "", v? "\n" : "");
1305                 free(buf);
1306                 buf = tmp;
1307         }
1308         ret = client_write(fd, buf);
1309 out:
1310         if (ret > 0)
1311                 ret = stat_client_add(fd, mask);
1312         free(buf);
1313         return ret;
1314 }
1315
1316 #if 0
1317 static char *list_filters(void)
1318 {
1319         int i, j;
1320         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1321
1322         FOR_EACH_AUDIO_FORMAT(i) {
1323                 for (j = 0; j < afi[i].num_filters; j++) {
1324                         tmp = make_message("%s\t%i\t%s\n",
1325                                 afi[i].name, j, afi[i].filter_cmds[j]);
1326                         msg = para_strcat(msg, tmp);
1327                         free(tmp);
1328                 }
1329                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1330                         j, afi[i].write_cmd);
1331                 msg = para_strcat(msg, tmp);
1332                 free(tmp);
1333         }
1334         return msg;
1335 }
1336 #endif
1337
1338 static int com_grab(int fd, int argc, char **argv)
1339 {
1340         struct grab_client *gc;
1341         struct filter_node *fn;
1342         int i, err;
1343         char *msg;
1344
1345         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1346         gc = grab_client_new(fd, argc, argv, &err);
1347         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1348         if (!gc)
1349                 goto err_out;
1350         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1351         if (fn)
1352                 activate_grab_client(gc, fn);
1353         return 1;
1354 err_out:
1355         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1356                 return err;
1357         if (err == -E_GC_HELP_GIVEN) {
1358                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1359                 for (i = 0; grab_client_args_info_help[i]; i++) {
1360                         char *tmp = make_message("%s%s\n", msg,
1361                                 grab_client_args_info_help[i]);
1362                         free(msg);
1363                         msg = tmp;
1364                 }
1365         } else
1366                 msg = make_message("%s %s\n",
1367                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1368                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1369         err = client_write(fd, msg);
1370         free(msg);
1371         if (err < 0)
1372                 return err;
1373         close(fd);
1374         return 1;
1375 }
1376
1377 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1378 {
1379         close(fd);
1380         clean_exit(EXIT_SUCCESS, "terminating on user request");
1381 }
1382
1383 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1384 {
1385         audiod_status = AUDIOD_ON;
1386         close(fd);
1387         return 1;
1388 }
1389
1390 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1391 {
1392         audiod_status = AUDIOD_OFF;
1393         close(fd);
1394         return 1;
1395 }
1396
1397 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1398 {
1399         audiod_status = AUDIOD_STANDBY;
1400         close(fd);
1401         return 1;
1402 }
1403
1404 static int com_cycle(int fd, int argc, char **argv)
1405 {
1406         switch (audiod_status) {
1407                 case  AUDIOD_ON:
1408                         return com_sb(fd, argc, argv);
1409                         break;
1410                 case  AUDIOD_OFF:
1411                         return com_on(fd, argc, argv);
1412                         break;
1413                 case  AUDIOD_STANDBY:
1414                         return com_off(fd, argc, argv);
1415                         break;
1416         }
1417         close(fd);
1418         return 1;
1419 }
1420
1421 static int check_perms(uid_t uid)
1422 {
1423         int i;
1424
1425         if (!conf.user_allow_given)
1426                 return 1;
1427         for (i = 0; i < conf.user_allow_given; i++)
1428                 if (uid == conf.user_allow_arg[i])
1429                         return 1;
1430         return -E_UCRED_PERM;
1431 }
1432
1433 static int handle_connect(void)
1434 {
1435         int i, argc, ret, clifd = -1;
1436         char *buf = para_malloc(MAXLINE), **argv = NULL;
1437         struct sockaddr_un unix_addr;
1438
1439         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1440         if (ret < 0)
1441                 goto out;
1442         clifd = ret;
1443         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1444         if (ret < 0)
1445                 goto out;
1446         PARA_INFO_LOG("connection from user %i\n",  ret);
1447         ret = check_perms(ret);
1448         if (ret < 0)
1449                 goto out;
1450         argc = split_args(buf, &argv, "\n");
1451         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1452         for (i = 0; cmds[i].name; i++) {
1453                 if (strcmp(cmds[i].name, argv[0]))
1454                         continue;
1455                 ret = cmds[i].handler(clifd, argc, argv);
1456                 goto out;
1457         }
1458         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1459 out:
1460         free(buf);
1461         free(argv);
1462         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1463                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1464                 client_write(clifd, tmp);
1465                 free(tmp);
1466                 close(clifd);
1467         }
1468         return ret;
1469 }
1470
1471 static void audiod_get_socket(void)
1472 {
1473         struct sockaddr_un unix_addr;
1474
1475         if (conf.socket_given)
1476                 socket_name = para_strdup(conf.socket_arg);
1477         else {
1478                 char *hn = para_hostname();
1479                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1480                         hn);
1481                 free(hn);
1482         }
1483         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1484         if (conf.force_given)
1485                 unlink(socket_name);
1486         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1487                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1488         if (audiod_socket < 0) {
1489                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1490                 exit(EXIT_FAILURE); /* do not unlink socket */
1491         }
1492         if (listen(audiod_socket, 5) < 0) {
1493                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1494                 exit(EXIT_FAILURE); /* do not unlink socket */
1495         }
1496         add_close_on_fork_list(audiod_socket);
1497 }
1498
1499 static int open_stat_pipe(void)
1500 {
1501         int ret, fd[3] = {-1, 1, 0};
1502         pid_t pid;
1503         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1504         if (ret >= 0) {
1505                 ret = fd[1];
1506                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1507                 add_close_on_fork_list(ret);
1508         } else
1509                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1510         return ret;
1511 }
1512
1513 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1514                 int *max_fileno)
1515 {
1516         int i, ret;
1517
1518         FOR_EACH_SLOT(i) {
1519                 struct slot_info *s = &slot[i];
1520                 struct audio_format_info *a;
1521                 struct receiver_node *rn = s->receiver_node;
1522                 if (s->format < 0 || !rn)
1523                         continue;
1524                 a = &afi[s->format];
1525                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1526 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1527                 *max_fileno = PARA_MAX(*max_fileno, ret);
1528         }
1529 }
1530 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1531 {
1532         int i, ret;
1533
1534         FOR_EACH_SLOT(i) {
1535                 struct slot_info *s = &slot[i];
1536                 struct audio_format_info *a;
1537                 struct receiver_node *rn = s->receiver_node;
1538                 if (s->format < 0 || !rn || rn->eof)
1539                         continue;
1540                 a = &afi[s->format];
1541                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1542                 if (ret <= 0) {
1543                         if (ret)
1544                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1545                                 a->receiver->name, PARA_STRERROR(-ret), i);
1546                         else
1547                                 PARA_INFO_LOG("eof in slot %d\n", i);
1548                         rn->eof = 1;
1549                 }
1550                 if (ret < 0 && s->fci)
1551                         s->fci->error = ret;
1552         }
1553 }
1554
1555 /* TODO: move everything before the select call to pre_select() */
1556 static void __noreturn audiod_mainloop(void)
1557 {
1558         fd_set rfds, wfds;
1559         int ret, max_fileno, sbo = 0;
1560         char status_buf[STRINGSIZE] = "";
1561         struct timeval tv;
1562 repeat:
1563         FD_ZERO(&wfds);
1564         FD_ZERO(&rfds);
1565         /* always check signal pipe and the local socket */
1566         FD_SET(signal_pipe, &rfds);
1567         max_fileno = signal_pipe;
1568         para_fd_set(audiod_socket, &rfds, &max_fileno);
1569
1570         if (audiod_status != AUDIOD_ON)
1571                 kill_all_decoders();
1572         else if (playing)
1573                 start_current_receiver();
1574
1575         set_stream_fds(&wfds, &max_fileno);
1576         /* status pipe */
1577         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1578                 close_stat_pipe();
1579         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1580                 stat_pipe = open_stat_pipe();
1581                 sbo = 0;
1582                 status_buf[0] = '\0';
1583         }
1584         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1585                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1586         /* local socket */
1587         tv.tv_sec = 0;
1588         tv.tv_usec = 200 * 1000;
1589         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1590         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1591         if (ret < 0)
1592                 goto repeat;
1593         if (audiod_status != AUDIOD_OFF)
1594                 audiod_status_dump();
1595         audiod_post_select(ret, &rfds, &wfds);
1596         /* read status pipe */
1597         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1598                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1599                 if (ret <= 0) {
1600                         close_stat_pipe();
1601                         /* avoid busy loop if server is down */
1602                         while (sleep(1) > 0)
1603                                 ; /* try again*/
1604                 } else {
1605                         status_buf[ret + sbo] = '\0';
1606                         sbo = for_each_line(status_buf, ret + sbo,
1607                                 &check_stat_line);
1608                 }
1609         }
1610         slot_io(&wfds);
1611         if (FD_ISSET(audiod_socket, &rfds)) {
1612                 ret = handle_connect();
1613                 if (ret < 0) {
1614                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1615                 }
1616         }
1617         /* signals */
1618         if (FD_ISSET(signal_pipe, &rfds)) {
1619                 int sig_nr = para_next_signal();
1620                 if (sig_nr > 0)
1621                         handle_signal(sig_nr);
1622         }
1623         goto repeat;
1624 }
1625
1626 static void set_initial_status(void)
1627 {
1628         audiod_status = AUDIOD_ON;
1629         if (!conf.mode_given)
1630                 return;
1631         if (!strcmp(conf.mode_arg, "sb")) {
1632                 audiod_status = AUDIOD_STANDBY;
1633                 return;
1634         }
1635         if (!strcmp(conf.mode_arg, "off")) {
1636                 audiod_status = AUDIOD_OFF;
1637                 return;
1638         }
1639         if (strcmp(conf.mode_arg, "on"))
1640                 PARA_WARNING_LOG("%s", "invalid mode\n");
1641 }
1642
1643 int __noreturn main(int argc, char *argv[])
1644 {
1645         char *cf;
1646         int i;
1647
1648         fprintf(stderr, "argc: %d\n", argc);
1649         valid_fd_012();
1650         hostname = para_hostname();
1651         cmdline_parser(argc, argv, &conf);
1652         para_drop_privileges(conf.user_arg, conf.group_arg);
1653         cf = configfile_exists();
1654         if (cf) {
1655                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1656                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1657                         exit(EXIT_FAILURE);
1658                 }
1659         }
1660         if (conf.logfile_given)
1661                 logfile = open_log(conf.logfile_arg);
1662         log_welcome("para_audiod", conf.loglevel_arg);
1663         i = init_stream_io();
1664         if (i < 0) {
1665                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1666                 exit(EXIT_FAILURE);
1667         }
1668         server_uptime(UPTIME_SET);
1669         set_initial_status();
1670         FOR_EACH_SLOT(i)
1671                 clear_slot(i);
1672         init_grabbing();
1673         setup_signal_handling();
1674         if (conf.daemon_given)
1675                 daemon_init();
1676         audiod_get_socket(); /* doesn't return on errors */
1677         audiod_mainloop();
1678 }