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                 decoder_flags[i] = flag;
 372         }
 373         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 374         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 375                 decoder_flags);
 376 }
 377
 378 static char *configfile_exists(void)
 379 {
 380         static char *config_file;
 381
 382         if (!config_file) {
 383                 char *home = para_homedir();
 384                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 385                 free(home);
 386         }
 387         return file_exists(config_file)? config_file : NULL;
 388 }
 389
 390 static void setup_signal_handling(void)
 391 {
 392         signal_pipe = para_signal_init();
 393         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 394         para_install_sighandler(SIGINT);
 395         para_install_sighandler(SIGTERM);
 396         para_install_sighandler(SIGCHLD);
 397         para_install_sighandler(SIGHUP);
 398         signal(SIGPIPE, SIG_IGN);
 399 }
 400
 401 static void audiod_status_dump(void)
 402 {
 403         static char *p_ts, *p_us, *p_as, *p_df;
 404         struct timeval *t = wstime();
 405         char *us, *tmp = get_time_string(t);
 406
 407         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 408                 stat_client_write(tmp, SI_PLAY_TIME);
 409         free(p_ts);
 410         p_ts = tmp;
 411
 412         us = uptime_str();
 413         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 414         free(us);
 415         if (!p_us || strcmp(p_us, tmp))
 416                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 417         free(p_us);
 418         p_us = tmp;
 419
 420         tmp = audiod_status_string();
 421         if (!p_as || strcmp(p_as, tmp))
 422                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 423         free(p_as);
 424         p_as = tmp;
 425
 426         tmp = decoder_flags();
 427         if (!p_df || strcmp(p_df, tmp))
 428                 stat_client_write(tmp, SI_DECODER_FLAGS);
 429         free(p_df);
 430         p_df = tmp;
 431 }
 432
 433 static void clear_slot(int slot_num)
 434 {
 435         struct slot_info *s = &slot[slot_num];
 436
 437         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 438         memset(s, 0, sizeof(struct slot_info));
 439         s->format = -1;
 440 }
 441
 442 static void kill_stream_writer(int slot_num)
 443 {
 444         struct slot_info *s = &slot[slot_num];
 445
 446         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 447                 return;
 448         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 449                 s->wpid, audio_formats[s->format], slot_num);
 450         kill(s->wpid, SIGTERM);
 451         s->wkilled = 1;
 452         s->fci->error = 1;
 453 }
 454
 455 static void set_restart_barrier(int format, struct timeval *now)
 456 {
 457         struct timeval tmp;
 458
 459         if (now)
 460                 tmp = *now;
 461         else
 462                 gettimeofday(&tmp, NULL);
 463         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 464 }
 465
 466 static void close_receiver(int slot_num)
 467 {
 468         struct slot_info *s = &slot[slot_num];
 469         struct audio_format_info *a;
 470
 471         if (s->format < 0 || !s->receiver_node)
 472                 return;
 473         a = &afi[s->format];
 474         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 475                 audio_formats[s->format] , slot_num);
 476         a->receiver->close(s->receiver_node);
 477         free(s->receiver_node);
 478         s->receiver_node = NULL;
 479         set_restart_barrier(s->format, NULL);
 480 }
 481
 482 static void kill_all_decoders(void)
 483 {
 484         int i;
 485
 486         FOR_EACH_SLOT(i)
 487                 if (slot[i].format >= 0) {
 488                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 489                         kill_stream_writer(i);
 490                 }
 491 }
 492
 493 static void check_sigchld(void)
 494 {
 495         pid_t pid;
 496         int i;
 497         struct timeval now;
 498         gettimeofday(&now, NULL);
 499
 500 reap_next_child:
 501         pid = para_reap_child();
 502         if (pid <= 0)
 503                 return;
 504         FOR_EACH_SLOT(i) {
 505                 struct slot_info *s = &slot[i];
 506                 long lifetime;
 507                 if (s->format < 0)
 508                         continue;
 509                 if (pid == s->wpid) {
 510                         s->wpid = -1;
 511                         lifetime = now.tv_sec - s->wstime.tv_sec;
 512                         PARA_INFO_LOG("%s stream writer in slot %d died "
 513                                 "after %li secs\n",
 514                                 audio_formats[s->format], i, lifetime);
 515                         set_restart_barrier(s->format, &now);
 516                         goto reap_next_child;
 517                 }
 518         }
 519         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 520         goto reap_next_child;
 521 }
 522
 523 static int get_empty_slot(void)
 524 {
 525         int i;
 526         struct slot_info *s;
 527
 528         FOR_EACH_SLOT(i) {
 529                 s = &slot[i];
 530                 if (s->format < 0) {
 531                         clear_slot(i);
 532                         return i;
 533                 }
 534                 if (s->write_fd > 0 || s->wpid > 0)
 535                         continue;
 536                 if (s->receiver_node)
 537                         continue;
 538                 if (s->fci)
 539                         continue;
 540                 clear_slot(i);
 541                 return i;
 542         }
 543         return -E_NO_MORE_SLOTS;
 544 }
 545
 546 static int decoder_running(int format)
 547 {
 548         int i, ret = 0;
 549         struct slot_info *s;
 550
 551         FOR_EACH_SLOT(i) {
 552                 s = &slot[i];
 553                 if (s->format == format && s->receiver_node)
 554                         ret |= 1;
 555                 if (s->format == format && s->wpid > 0)
 556                         ret |= 2;
 557         }
 558         return ret;
 559 }
 560
 561 static void close_stat_pipe(void)
 562 {
 563         int i;
 564
 565         if (stat_pipe < 0)
 566                 return;
 567         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 568         close(stat_pipe);
 569         del_close_on_fork_list(stat_pipe);
 570         stat_pipe = -1;
 571         kill_all_decoders();
 572         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 573                 free(stat_item_values[i]);
 574                 stat_item_values[i] = NULL;
 575         }
 576         dump_empty_status();
 577         length_seconds = 0;
 578         offset_seconds = 0;
 579         audiod_status_dump();
 580         playing = 0;
 581         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 582                 status_item_list[SI_STATUS_BAR]);
 583         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 584 }
 585
 586 static void __noreturn clean_exit(int status, const char *msg)
 587 {
 588         PARA_EMERG_LOG("%s\n", msg);
 589         kill_all_decoders();
 590         if (socket_name)
 591                 unlink(socket_name);
 592         if (stat_pipe >= 0)
 593                 close_stat_pipe();
 594         exit(status);
 595 }
 596
 597 __malloc static char *glob_cmd(char *cmd)
 598 {
 599         char *ret, *replacement;
 600         struct timeval tmp, delay, rss; /* real stream start */
 601
 602         delay.tv_sec = conf.stream_delay_arg / 1000;
 603         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 604 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 605         if (sa_time_diff_sign < 0)
 606                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 607         else
 608                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 609         tv_add(&rss, &delay, &tmp);
 610         replacement = make_message("%lu:%lu",
 611                 (long unsigned)tmp.tv_sec,
 612                 (long unsigned)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 out:
 619         return ret;
 620 }
 621
 622 /** get the number of filters for the given audio format */
 623 int num_filters(int audio_format_num)
 624 {
 625         return afi[audio_format_num].num_filters;
 626 }
 627
 628 static void open_filters(int slot_num)
 629 {
 630         struct slot_info *s = &slot[slot_num];
 631         struct audio_format_info *a = &afi[s->format];
 632         int nf = a->num_filters;
 633         int i;
 634
 635         s->fci = para_calloc(sizeof(struct filter_chain_info));
 636         INIT_LIST_HEAD(&s->fci->filters);
 637         if (!nf)
 638                 return;
 639         s->fci->inbuf = s->receiver_node->buf;
 640         s->fci->in_loaded = &s->receiver_node->loaded;
 641         s->fci->outbuf = s->receiver_node->buf;
 642         s->fci->out_loaded = &s->receiver_node->loaded;
 643         s->fci->eof = &s->receiver_node->eof;
 644         for (i = 0; i < nf; i++) {
 645                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 646                 fn->conf = a->filter_conf[i];
 647                 fn->fci = s->fci;
 648                 fn->filter = a->filters[i];
 649                 INIT_LIST_HEAD(&fn->callbacks);
 650                 list_add_tail(&fn->node, &s->fci->filters);
 651                 fn->filter->open(fn);
 652                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 653                         audio_formats[s->format], i + 1,  nf,
 654                         fn->filter->name, slot_num);
 655                 s->fci->outbuf = fn->buf;
 656                 s->fci->out_loaded = &fn->loaded;
 657         }
 658         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 659                 s->fci->outbuf);
 660 }
 661
 662 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 663 {
 664         struct filter_node *fn;
 665         int i, j;
 666
 667         FOR_EACH_SLOT(i) {
 668                 struct slot_info *s = &slot[i];
 669                 if (s->format < 0 || !s->fci)
 670                         continue;
 671                 if (slot_num >= 0 && slot_num != i)
 672                         continue;
 673                 if (format >= 0 && s->format != format)
 674                         continue;
 675                 if (num_filters(i) < filternum)
 676                         continue;
 677                 /* success */
 678                 j = 1;
 679                 list_for_each_entry(fn, &s->fci->filters, node)
 680                         if (filternum <= 0 || j++ == filternum)
 681                                 break;
 682                 return fn;
 683         }
 684         return NULL;
 685 }
 686
 687 static void start_stream_writer(int slot_num)
 688 {
 689         int ret, fds[3] = {1, -1, -1};
 690         struct slot_info *s = &slot[slot_num];
 691         struct audio_format_info *a = &afi[s->format];
 692         char *glob = NULL;
 693
 694         if (a->write_cmd)
 695                 glob = glob_cmd(a->write_cmd);
 696         if (!glob)
 697                 glob = para_strdup("para_write -w alsa");
 698         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 699         open_filters(slot_num);
 700         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 701         free(glob);
 702         if (ret < 0) {
 703                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 704                 return;
 705         }
 706         s->write_fd = fds[0];
 707         add_close_on_fork_list(s->write_fd);
 708         /* we write to this fd in do_select, so we need non-blocking */
 709         mark_fd_nonblock(s->write_fd);
 710         gettimeofday(&s->wstime, NULL);
 711         current_decoder = slot_num;
 712         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 713 }
 714
 715 static void open_receiver(int format)
 716 {
 717         struct audio_format_info *a = &afi[format];
 718         struct slot_info *s;
 719         int ret, slot_num;
 720
 721         slot_num = get_empty_slot();
 722         if (slot_num < 0)
 723                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 724         s = &slot[slot_num];
 725         s->format = format;
 726         gettimeofday(&s->rtime, NULL);
 727         s->wtime = s->rtime;
 728         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 729         s->receiver_node->conf = a->receiver_conf;
 730         ret = a->receiver->open(s->receiver_node);
 731         if (ret < 0) {
 732                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 733                         PARA_STRERROR(-ret));
 734                 free(s->receiver_node);
 735                 s->receiver_node = NULL;
 736                 return;
 737         }
 738         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 739                 audio_formats[s->format], a->receiver->name, slot_num);
 740 }
 741
 742 static int is_frozen(int format)
 743 {
 744         struct timeval now;
 745         struct audio_format_info *a = &afi[format];
 746
 747         gettimeofday(&now, NULL);
 748         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 749 }
 750
 751 static void start_current_receiver(void)
 752 {
 753         int i;
 754
 755         if (!af_status)
 756                 return;
 757         i = get_audio_format_num(af_status);
 758         if (i < 0)
 759                 return;
 760         if ((decoder_running(i) & 1) || is_frozen(i))
 761                 return;
 762         open_receiver(i);
 763 }
 764
 765 static void compute_time_diff(const struct timeval *status_time)
 766 {
 767         struct timeval now, tmp, diff;
 768         static int count;
 769         int sign;
 770         const struct timeval max_deviation = {0, 500 * 1000};
 771         const int time_smooth = 5;
 772
 773         gettimeofday(&now, NULL);
 774         sign = tv_diff(status_time, &now, &diff);
 775 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 776 //                      sign, sa_time_diff_sign);
 777         if (!count) {
 778                 sa_time_diff_sign = sign;
 779                 sa_time_diff = diff;
 780                 count++;
 781                 return;
 782         }
 783         if (count > 5) {
 784                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 785                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 786                         PARA_WARNING_LOG("time diff jump: %lims\n",
 787                                 s * tv2ms(&tmp));
 788         }
 789         count++;
 790         sa_time_diff_sign = tv_convex_combination(
 791                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 792                 count > 10? sign : sign * time_smooth, &diff,
 793                 &tmp);
 794         sa_time_diff = tmp;
 795         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 796                 sign > 0? "+" : "-",
 797                 tv2ms(&diff),
 798                 sa_time_diff_sign ? "+" : "-",
 799                 tv2ms(&sa_time_diff)
 800         );
 801 }
 802
 803 static void check_stat_line(char *line)
 804 {
 805         int itemnum;
 806         size_t ilen = 0;
 807         long unsigned sec, usec;
 808         char *tmp;
 809
 810 //      PARA_INFO_LOG("line: %s\n", line);
 811         if (!line)
 812                 return;
 813         itemnum = stat_line_valid(line);
 814         if (itemnum < 0) {
 815                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 816                 return;
 817         }
 818         tmp = make_message("%s\n", line);
 819         stat_client_write(tmp, itemnum);
 820         free(tmp);
 821         free(stat_item_values[itemnum]);
 822         stat_item_values[itemnum] = para_strdup(line);
 823         ilen = strlen(status_item_list[itemnum]);
 824         switch (itemnum) {
 825         case SI_STATUS:
 826                 playing = strstr(line, "playing")? 1 : 0;
 827                 break;
 828         case SI_FORMAT:
 829                 free(af_status);
 830                 af_status = para_strdup(line + ilen + 1);
 831                 break;
 832         case SI_OFFSET:
 833                 offset_seconds = atoi(line + ilen + 1);
 834                 break;
 835         case SI_LENGTH:
 836                 length_seconds = atoi(line + ilen + 1);
 837                 break;
 838         case SI_STREAM_START:
 839                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 840                         server_stream_start.tv_sec = sec;
 841                         server_stream_start.tv_usec = usec;
 842                 }
 843                 break;
 844         case SI_CURRENT_TIME:
 845                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 846                         struct timeval tv = {sec, usec};
 847                         compute_time_diff(&tv);
 848                 }
 849                 break;
 850         }
 851 }
 852
 853 static void handle_signal(int sig)
 854 {
 855         switch (sig) {
 856         case SIGCHLD:
 857                 return check_sigchld();
 858         case SIGINT:
 859         case SIGTERM:
 860         case SIGHUP:
 861                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 862                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 863                 return;
 864         }
 865 }
 866
 867 static void check_timeouts(void)
 868 {
 869         struct timeval now;
 870         int slot_num, timeout = conf.stream_timeout_arg;
 871
 872         gettimeofday(&now, NULL);
 873         FOR_EACH_SLOT(slot_num) {
 874                 struct slot_info *s = &slot[slot_num];
 875                 if (s->format < 0)
 876                         continue;
 877                 /* check read time */
 878                 if (s->receiver_node &&
 879                         now.tv_sec > s->rtime.tv_sec + timeout) {
 880                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 881                                 audio_formats[s->format], slot_num);
 882                         if (s->fci)
 883                                 s->fci->error = 42;
 884                         else
 885                                 close_receiver(slot_num);
 886                 }
 887                 /* check write time */
 888                 if (s->wpid > 0 && !s->wkilled &&
 889                         now.tv_sec > s->wtime.tv_sec + timeout) {
 890                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 891                                 audio_formats[s->format], slot_num);
 892                         if (s->fci)
 893                                 s->fci->error = 42;
 894                 }
 895         }
 896 }
 897
 898 static size_t get_loaded_bytes(int slot_num)
 899 {
 900         size_t loaded = 0;
 901         struct slot_info *s = &slot[slot_num];
 902         struct receiver_node *rn = s->receiver_node;
 903
 904         if (s->format < 0)
 905                 goto out;
 906
 907         if (afi[s->format].num_filters) {
 908                 if (s->fci)
 909                         loaded = *s->fci->out_loaded;
 910         } else {
 911                 if (rn)
 912                         loaded = rn->loaded;
 913         }
 914 out:
 915         return loaded;
 916 }
 917
 918
 919 static void close_decoder_if_idle(int slot_num)
 920 {
 921         struct slot_info *s = &slot[slot_num];
 922         struct receiver_node *rn = s->receiver_node;
 923
 924         if (s->format < 0)
 925                 return;
 926         if (!s->fci)
 927                 return;
 928         if (!rn->eof && !s->fci->error && s->wpid > 0)
 929                 return;
 930         if (!s->fci->error && s->wpid > 0) { /* eof */
 931                 if (filter_io(s->fci) > 0)
 932                         return;
 933                 if (get_loaded_bytes(slot_num))
 934                         return;
 935         }
 936         if (s->write_fd > 0) {
 937                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 938                         s->write_fd);
 939                 close(s->write_fd);
 940                 del_close_on_fork_list(s->write_fd);
 941                 s->write_fd = -1;
 942         }
 943         if (s->wpid > 0)
 944                 return; /* wait until writer dies before closing filters */
 945         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 946                 slot_num, s->fci);
 947         close_filters(s->fci);
 948         free(s->fci);
 949         close_receiver(slot_num);
 950         clear_slot(slot_num);
 951 }
 952
 953 static void set_stream_fds(fd_set *wfds, int *max_fileno)
 954 {
 955         int i;
 956
 957         check_timeouts();
 958         FOR_EACH_SLOT(i) {
 959                 struct slot_info *s = &slot[i];
 960                 struct audio_format_info *a;
 961                 struct receiver_node *rn;
 962
 963                 close_decoder_if_idle(i);
 964                 s->wcheck = 0;
 965                 if (s->format < 0)
 966                         continue;
 967                 a = &afi[s->format];
 968                 rn = s->receiver_node;
 969                 if (rn && rn->loaded && !s->wpid) {
 970                         PARA_INFO_LOG("no writer in slot %d\n", i);
 971                         start_stream_writer(i);
 972                 }
 973                 if (s->write_fd <= 0)
 974                         continue;
 975                 if (!get_loaded_bytes(i))
 976                         continue;
 977                 para_fd_set(s->write_fd, wfds, max_fileno);
 978                 s->wcheck = 1;
 979         }
 980 }
 981
 982 static int write_audio_data(int slot_num)
 983 {
 984         struct slot_info *s = &slot[slot_num];
 985         struct audio_format_info *a = &afi[s->format];
 986         struct receiver_node *rn = s->receiver_node;
 987         int rv;
 988         char **buf;
 989         size_t *len;
 990
 991         if (a->num_filters) {
 992                 buf = &s->fci->outbuf;
 993                 len = s->fci->out_loaded;
 994         } else {
 995                 buf = &rn->buf;
 996                 len = &rn->loaded;
 997         }
 998         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
 999         rv = write(s->write_fd, *buf, *len);
1000         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1001         if (rv < 0) {
1002                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1003                         slot_num, s->write_fd, strerror(errno));
1004                 *len = 0;
1005                 s->fci->error = E_WRITE_AUDIO_DATA;
1006         } else if (rv != *len) {
1007                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1008                         audio_formats[s->format], rv, *len, slot_num);
1009                 *len -= rv;
1010                 memmove(*buf, *buf + rv, *len);
1011         } else
1012                 *len = 0;
1013         if (rv > 0)
1014                 gettimeofday(&s->wtime, NULL);
1015         return rv;
1016 }
1017
1018 static void slot_io(fd_set *wfds)
1019 {
1020         int ret, i;
1021
1022         FOR_EACH_SLOT(i) {
1023                 struct slot_info *s = &slot[i];
1024                 struct receiver_node *rn = s->receiver_node;
1025
1026                 if (rn && rn->loaded)
1027                         gettimeofday(&s->rtime, NULL);
1028                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1029                         ret = filter_io(s->fci);
1030                         if (ret < 0)
1031                                 s->fci->error = -ret;
1032 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1033 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1034                 }
1035                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1036                         continue;
1037                 write_audio_data(i);
1038         }
1039 }
1040
1041 static int parse_stream_command(const char *txt, char **cmd)
1042 {
1043         char *p = strchr(txt, ':');
1044         int i;
1045
1046         if (!p)
1047                 return -E_MISSING_COLON;
1048         p++;
1049         FOR_EACH_AUDIO_FORMAT(i) {
1050                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1051                         continue;
1052                 *cmd = p;
1053                 return i;
1054         }
1055         return -E_UNSUPPORTED_AUDIO_FORMAT;
1056 }
1057
1058 static int add_filter(int format, char *cmdline)
1059 {
1060         struct audio_format_info *a = &afi[format];
1061         int filter_num, nf = a->num_filters;
1062
1063         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1064         if (filter_num < 0)
1065                 return filter_num;
1066         a->filters[nf] = &filters[filter_num];
1067         a->num_filters++;
1068         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1069                 a->filters[nf]->name);
1070         return filter_num;
1071 }
1072
1073 static int setup_default_filters(void)
1074 {
1075         int i, ret = 1;
1076
1077         FOR_EACH_AUDIO_FORMAT(i) {
1078                 struct audio_format_info *a = &afi[i];
1079                 char *tmp;
1080                 int j;
1081                 if (a->num_filters)
1082                         continue;
1083                 /* add "dec" to audio format name */
1084                 tmp = make_message("%sdec", audio_formats[i]);
1085                 for (j = 0; filters[j].name; j++)
1086                         if (!strcmp(tmp, filters[j].name))
1087                                 break;
1088                 free(tmp);
1089                 ret = -E_UNSUPPORTED_FILTER;
1090                 if (!filters[j].name)
1091                         goto out;
1092                 tmp = para_strdup(filters[j].name);
1093                 ret = add_filter(i, tmp);
1094                 free(tmp);
1095                 if (ret < 0)
1096                         goto out;
1097                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1098                         filters[j].name);
1099                 ret = add_filter(i, "wav");
1100                 if (ret < 0)
1101                         goto out;
1102                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1103         }
1104 out:
1105         return ret;
1106 }
1107
1108 static int init_stream_io(void)
1109 {
1110         int i, ret, receiver_num, nf;
1111         char *cmd;
1112
1113         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1114                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1115                 if (ret < 0)
1116                         goto out;
1117                 afi[ret].write_cmd = para_strdup(cmd);
1118                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1119         }
1120         for (i = 0; receivers[i].name; i++) {
1121                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1122                 receivers[i].init(&receivers[i]);
1123         }
1124         for (i = 0; i < conf.receiver_given; i++) {
1125                 char *arg = conf.receiver_arg[i];
1126                 char *recv = strchr(arg, ':');
1127                 ret = -E_MISSING_COLON;
1128                 if (!recv)
1129                         goto out;
1130                 *recv = '\0';
1131                 recv++;
1132                 ret = get_audio_format_num(arg);
1133                 if (ret < 0)
1134                         goto out;
1135                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1136                 if (!afi[ret].receiver_conf) {
1137                         ret = -E_RECV_SYNTAX;
1138                         goto out;
1139                 }
1140                 afi[ret].receiver = &receivers[receiver_num];
1141         }
1142         /* use the first available receiver with no arguments
1143          * for those audio formats for which no receiver
1144          * was specified
1145          */
1146         cmd = para_strdup(receivers[0].name);
1147         FOR_EACH_AUDIO_FORMAT(i) {
1148                 struct audio_format_info *a = &afi[i];
1149                 if (a->receiver_conf)
1150                         continue;
1151                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1152                 if (!a->receiver_conf)
1153                         return -E_RECV_SYNTAX;
1154                 a->receiver = &receivers[receiver_num];
1155         }
1156         free(cmd);
1157         /* filters */
1158         filter_init(filters);
1159         nf = PARA_MAX(2,  conf.filter_given) + 1;
1160         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1161         FOR_EACH_AUDIO_FORMAT(i) {
1162                 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1163                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1164         }
1165         if (!conf.no_default_filters_given)
1166                 return setup_default_filters();
1167         for (i = 0; i < conf.filter_given; i++) {
1168                 char *arg = conf.filter_arg[i];
1169                 char *filter_name = strchr(arg, ':');
1170                 ret = -E_MISSING_COLON;
1171                 if (!filter_name)
1172                         goto out;
1173                 *filter_name = '\0';
1174                 filter_name++;
1175                 ret = get_audio_format_num(arg);
1176                 if (ret < 0)
1177                         goto out;
1178                 ret = add_filter(ret, filter_name);
1179                 if (ret < 0)
1180                         goto out;
1181         }
1182         ret = 1;
1183 out:
1184         return ret;
1185 }
1186
1187 static int dump_commands(int fd)
1188 {
1189         char *buf = para_strdup(""), *tmp = NULL;
1190         int i;
1191         ssize_t ret;
1192
1193         FOR_EACH_COMMAND(i) {
1194                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1195                         cmds[i].description);
1196                 free(buf);
1197                 buf = tmp;
1198         }
1199         ret = client_write(fd, buf);
1200         free(buf);
1201         return ret;
1202 }
1203
1204 /*
1205  * command handlers don't close their fd on errors (ret < 0) so that
1206  * its caller can send an error message. Otherwise (ret >= 0) it's up
1207  * to each individual command to close the fd if necessary.
1208  */
1209
1210 static int com_help(int fd, int argc, char **argv)
1211 {
1212         int i, ret;
1213         char *buf;
1214         const char *dflt = "No such command. Available commands:\n";
1215
1216         if (argc < 2) {
1217                 ret = dump_commands(fd);
1218                 goto out;
1219         }
1220         FOR_EACH_COMMAND(i) {
1221                 if (strcmp(cmds[i].name, argv[1]))
1222                         continue;
1223                 buf = make_message(
1224                         "NAME\n\t%s -- %s\n"
1225                         "SYNOPSIS\n\tpara_audioc %s\n"
1226                         "DESCRIPTION\n%s\n",
1227                         argv[1],
1228                         cmds[i].description,
1229                         cmds[i].synopsis,
1230                         cmds[i].help
1231                 );
1232                 ret = client_write(fd, buf);
1233                 free(buf);
1234                 goto out;
1235         }
1236         ret = client_write(fd, dflt);
1237         if (ret > 0)
1238                 ret = dump_commands(fd);
1239 out:
1240         if (ret >= 0)
1241                 close(fd);
1242         return ret;
1243 }
1244
1245 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1246 {
1247         int i, ret;
1248         char *buf = NULL;
1249         long unsigned mask = ~0LU;
1250
1251         if (argc > 1) {
1252                 mask = 0;
1253                 for (i = 1; i < argc; i++) {
1254                         ret = stat_item_valid(argv[i]);
1255                         if (ret < 0)
1256                                 return ret;
1257                         mask |= (1 << ret);
1258                 }
1259         }
1260         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1261         if (mask & (1 << SI_PLAY_TIME)) {
1262                 struct timeval *t = wstime();
1263                 char *ts = get_time_string(t);
1264                 if (ts) {
1265                         ret = client_write(fd, ts);
1266                         if (ret < 0)
1267                                 goto out;
1268                         free(ts);
1269                 }
1270         }
1271         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1272                 char *tmp, *us = uptime_str();
1273                 tmp = make_message("%s:%s\n",
1274                         status_item_list[SI_AUDIOD_UPTIME], us);
1275                 free(us);
1276                 ret = client_write(fd, tmp);
1277                 if (ret < 0)
1278                         goto out;
1279                 free(tmp);
1280         }
1281         if (mask & (1 << SI_AUDIOD_STATUS)) {
1282                 char *s = audiod_status_string();
1283                 ret = client_write(fd, s);
1284                 if (ret < 0)
1285                         goto out;
1286                 free(s);
1287         }
1288         if (mask & (1 << SI_DECODER_FLAGS)) {
1289                 char *df =decoder_flags();
1290                 ret = client_write(fd, df);
1291                 if (ret < 0)
1292                         goto out;
1293                 free(df);
1294         }
1295
1296         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1297                 char *tmp, *v;
1298                 if (!((1 << i) & mask))
1299                         continue;
1300                 v = stat_item_values[i];
1301                 tmp = make_message("%s%s%s", buf? buf: "",
1302                         v? v : "", v? "\n" : "");
1303                 free(buf);
1304                 buf = tmp;
1305         }
1306         ret = client_write(fd, buf);
1307 out:
1308         if (ret > 0)
1309                 ret = stat_client_add(fd, mask);
1310         free(buf);
1311         return ret;
1312 }
1313
1314 #if 0
1315 static char *list_filters(void)
1316 {
1317         int i, j;
1318         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1319
1320         FOR_EACH_AUDIO_FORMAT(i) {
1321                 for (j = 0; j < afi[i].num_filters; j++) {
1322                         tmp = make_message("%s\t%i\t%s\n",
1323                                 afi[i].name, j, afi[i].filter_cmds[j]);
1324                         msg = para_strcat(msg, tmp);
1325                         free(tmp);
1326                 }
1327                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1328                         j, afi[i].write_cmd);
1329                 msg = para_strcat(msg, tmp);
1330                 free(tmp);
1331         }
1332         return msg;
1333 }
1334 #endif
1335
1336 static int com_grab(int fd, int argc, char **argv)
1337 {
1338         struct grab_client *gc;
1339         struct filter_node *fn;
1340         int i, err;
1341         char *msg;
1342
1343         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1344         gc = grab_client_new(fd, argc, argv, &err);
1345         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1346         if (!gc)
1347                 goto err_out;
1348         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1349         if (fn)
1350                 activate_grab_client(gc, fn);
1351         return 1;
1352 err_out:
1353         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1354                 return err;
1355         if (err == -E_GC_HELP_GIVEN) {
1356                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1357                 for (i = 0; grab_client_args_info_help[i]; i++) {
1358                         char *tmp = make_message("%s%s\n", msg,
1359                                 grab_client_args_info_help[i]);
1360                         free(msg);
1361                         msg = tmp;
1362                 }
1363         } else
1364                 msg = make_message("%s %s\n",
1365                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1366                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1367         err = client_write(fd, msg);
1368         free(msg);
1369         if (err < 0)
1370                 return err;
1371         close(fd);
1372         return 1;
1373 }
1374
1375 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1376 {
1377         close(fd);
1378         clean_exit(EXIT_SUCCESS, "terminating on user request");
1379 }
1380
1381 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1382 {
1383         audiod_status = AUDIOD_ON;
1384         close(fd);
1385         return 1;
1386 }
1387
1388 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1389 {
1390         audiod_status = AUDIOD_OFF;
1391         close(fd);
1392         return 1;
1393 }
1394
1395 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1396 {
1397         audiod_status = AUDIOD_STANDBY;
1398         close(fd);
1399         return 1;
1400 }
1401
1402 static int com_cycle(int fd, int argc, char **argv)
1403 {
1404         switch (audiod_status) {
1405                 case  AUDIOD_ON:
1406                         return com_sb(fd, argc, argv);
1407                         break;
1408                 case  AUDIOD_OFF:
1409                         return com_on(fd, argc, argv);
1410                         break;
1411                 case  AUDIOD_STANDBY:
1412                         return com_off(fd, argc, argv);
1413                         break;
1414         }
1415         close(fd);
1416         return 1;
1417 }
1418
1419 static int check_perms(uid_t uid)
1420 {
1421         int i;
1422
1423         if (!conf.user_allow_given)
1424                 return 1;
1425         for (i = 0; i < conf.user_allow_given; i++)
1426                 if (uid == conf.user_allow_arg[i])
1427                         return 1;
1428         return -E_UCRED_PERM;
1429 }
1430
1431 static int handle_connect(void)
1432 {
1433         int i, argc, ret, clifd = -1;
1434         char *buf = para_malloc(MAXLINE), **argv = NULL;
1435         struct sockaddr_un unix_addr;
1436
1437         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1438         if (ret < 0)
1439                 goto out;
1440         clifd = ret;
1441         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1442         if (ret < 0)
1443                 goto out;
1444         PARA_INFO_LOG("connection from user %i\n",  ret);
1445         ret = check_perms(ret);
1446         if (ret < 0)
1447                 goto out;
1448         argc = split_args(buf, &argv, "\n");
1449         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1450         for (i = 0; cmds[i].name; i++) {
1451                 if (strcmp(cmds[i].name, argv[0]))
1452                         continue;
1453                 ret = cmds[i].handler(clifd, argc, argv);
1454                 goto out;
1455         }
1456         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1457 out:
1458         free(buf);
1459         free(argv);
1460         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1461                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1462                 client_write(clifd, tmp);
1463                 free(tmp);
1464                 close(clifd);
1465         }
1466         return ret;
1467 }
1468
1469 static void audiod_get_socket(void)
1470 {
1471         struct sockaddr_un unix_addr;
1472
1473         if (conf.socket_given)
1474                 socket_name = para_strdup(conf.socket_arg);
1475         else {
1476                 char *hn = para_hostname();
1477                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1478                         hn);
1479                 free(hn);
1480         }
1481         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1482         if (conf.force_given)
1483                 unlink(socket_name);
1484         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1485                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1486         if (audiod_socket < 0) {
1487                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1488                 exit(EXIT_FAILURE); /* do not unlink socket */
1489         }
1490         if (listen(audiod_socket, 5) < 0) {
1491                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1492                 exit(EXIT_FAILURE); /* do not unlink socket */
1493         }
1494         add_close_on_fork_list(audiod_socket);
1495 }
1496
1497 static int open_stat_pipe(void)
1498 {
1499         int ret, fd[3] = {-1, 1, 0};
1500         pid_t pid;
1501         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1502         if (ret >= 0) {
1503                 ret = fd[1];
1504                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1505                 add_close_on_fork_list(ret);
1506         } else
1507                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1508         return ret;
1509 }
1510
1511 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1512                 int *max_fileno)
1513 {
1514         int i, ret;
1515
1516         FOR_EACH_SLOT(i) {
1517                 struct slot_info *s = &slot[i];
1518                 struct audio_format_info *a;
1519                 struct receiver_node *rn = s->receiver_node;
1520                 if (s->format < 0 || !rn)
1521                         continue;
1522                 a = &afi[s->format];
1523                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1524 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1525                 *max_fileno = PARA_MAX(*max_fileno, ret);
1526         }
1527 }
1528 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1529 {
1530         int i, ret;
1531
1532         FOR_EACH_SLOT(i) {
1533                 struct slot_info *s = &slot[i];
1534                 struct audio_format_info *a;
1535                 struct receiver_node *rn = s->receiver_node;
1536                 if (s->format < 0 || !rn || rn->eof)
1537                         continue;
1538                 a = &afi[s->format];
1539                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1540                 if (ret <= 0) {
1541                         if (ret)
1542                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1543                                 a->receiver->name, PARA_STRERROR(-ret), i);
1544                         else
1545                                 PARA_INFO_LOG("eof in slot %d\n", i);
1546                         rn->eof = 1;
1547                 }
1548                 if (ret < 0 && s->fci)
1549                         s->fci->error = ret;
1550         }
1551 }
1552
1553 /* TODO: move everything before the select call to pre_select() */
1554 static void __noreturn audiod_mainloop(void)
1555 {
1556         fd_set rfds, wfds;
1557         int ret, max_fileno, sbo = 0;
1558         char status_buf[STRINGSIZE] = "";
1559         struct timeval tv;
1560 repeat:
1561         FD_ZERO(&wfds);
1562         FD_ZERO(&rfds);
1563         max_fileno = -1;
1564         /* always check signal pipe and the local socket */
1565         para_fd_set(signal_pipe, &rfds, &max_fileno);
1566         para_fd_set(audiod_socket, &rfds, &max_fileno);
1567
1568         if (audiod_status != AUDIOD_ON)
1569                 kill_all_decoders();
1570         else if (playing)
1571                 start_current_receiver();
1572
1573         set_stream_fds(&wfds, &max_fileno);
1574         /* status pipe */
1575         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1576                 close_stat_pipe();
1577         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1578                 stat_pipe = open_stat_pipe();
1579                 sbo = 0;
1580                 status_buf[0] = '\0';
1581         }
1582         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1583                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1584         /* local socket */
1585         tv.tv_sec = 0;
1586         tv.tv_usec = 200 * 1000;
1587         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1588         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1589         if (ret < 0)
1590                 goto repeat;
1591         if (audiod_status != AUDIOD_OFF)
1592                 audiod_status_dump();
1593         audiod_post_select(ret, &rfds, &wfds);
1594         /* read status pipe */
1595         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1596                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1597                 if (ret <= 0) {
1598                         close_stat_pipe();
1599                         /* avoid busy loop if server is down */
1600                         while (sleep(1) > 0)
1601                                 ; /* try again*/
1602                 } else {
1603                         status_buf[ret + sbo] = '\0';
1604                         sbo = for_each_line(status_buf, ret + sbo,
1605                                 &check_stat_line);
1606                 }
1607         }
1608         slot_io(&wfds);
1609         if (FD_ISSET(audiod_socket, &rfds)) {
1610                 ret = handle_connect();
1611                 if (ret < 0) {
1612                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1613                 }
1614         }
1615         /* signals */
1616         if (FD_ISSET(signal_pipe, &rfds)) {
1617                 int sig_nr = para_next_signal();
1618                 if (sig_nr > 0)
1619                         handle_signal(sig_nr);
1620         }
1621         goto repeat;
1622 }
1623
1624 static void set_initial_status(void)
1625 {
1626         audiod_status = AUDIOD_ON;
1627         if (!conf.mode_given)
1628                 return;
1629         if (!strcmp(conf.mode_arg, "sb")) {
1630                 audiod_status = AUDIOD_STANDBY;
1631                 return;
1632         }
1633         if (!strcmp(conf.mode_arg, "off")) {
1634                 audiod_status = AUDIOD_OFF;
1635                 return;
1636         }
1637         if (strcmp(conf.mode_arg, "on"))
1638                 PARA_WARNING_LOG("%s", "invalid mode\n");
1639 }
1640
1641 int __noreturn main(int argc, char *argv[])
1642 {
1643         char *cf;
1644         int i;
1645
1646         valid_fd_012();
1647         hostname = para_hostname();
1648         cmdline_parser(argc, argv, &conf);
1649         para_drop_privileges(conf.user_arg, conf.group_arg);
1650         cf = configfile_exists();
1651         if (cf) {
1652                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1653                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1654                         exit(EXIT_FAILURE);
1655                 }
1656         }
1657         if (conf.logfile_given)
1658                 logfile = open_log(conf.logfile_arg);
1659         log_welcome("para_audiod", conf.loglevel_arg);
1660         i = init_stream_io();
1661         if (i < 0) {
1662                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1663                 exit(EXIT_FAILURE);
1664         }
1665         server_uptime(UPTIME_SET);
1666         set_initial_status();
1667         FOR_EACH_SLOT(i)
1668                 clear_slot(i);
1669         init_grabbing();
1670         setup_signal_handling();
1671         if (conf.daemon_given)
1672                 daemon_init();
1673         audiod_get_socket(); /* doesn't return on errors */
1674         audiod_mainloop();
1675 }