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 "sched.h"
  28 #include "recv.h"
  29 #include "filter.h"
  30 #include "grab_client.cmdline.h"
  31 #include "grab_client.h"
  32
  33 #include "error.h"
  34 #include "audiod.h"
  35 #include "net.h"
  36 #include "daemon.h"
  37 #include "string.h"
  38 #include "fd.h"
  39
  40 /** define the array of error lists needed by para_audiod */
  41 INIT_AUDIOD_ERRLISTS;
  42 /** define the array containing all supported audio formats */
  43 DEFINE_AUDIO_FORMAT_ARRAY;
  44
  45 /**
  46  * the possible modes of operation
  47  *
  48  * - off: disconnect from para_server
  49  * - on: receive status information from para_server and play the audio stream
  50  * - sb: only receive status information but not the audio stream
  51 */
  52 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  53
  54 /** defines how to handle one supported audio format */
  55 struct audio_format_info {
  56 /** pointer to the receiver for this audio format */
  57         struct receiver *receiver;
  58 /** the receiver configuration */
  59         void *receiver_conf;
  60 /** the number of filters that should be activated for this audio format */
  61         unsigned int num_filters;
  62 /** pointer to the array of filters to be activated */
  63         struct filter **filters;
  64 /** pointer to the array of filter configurations */
  65         void **filter_conf;
  66 /** output of the last filter is written to stdin of this command */
  67         char *write_cmd;
  68 /** do not start receiver/filters/writer before this time */
  69         struct timeval restart_barrier;
  70 };
  71
  72 /**
  73  * describes one instance of a receiver-filter-writer chain
  74  *
  75  * \sa receier_node, receiver, filter, filter_node, filter_chain_info
  76   */
  77 struct slot_info {
  78 /** number of the audio format in this slot */
  79         int format;
  80 /** the file descriptor of the writer */
  81         int write_fd;
  82 /** the process id of the writer */
  83         pid_t wpid;
  84 /** time of the last successful read from the receiver */
  85         struct timeval rtime;
  86 /** time the last write to the write fd happend */
  87         struct timeval wtime;
  88 /** writer start time */
  89         struct timeval wstime;
  90 /** did we include \a write_fd in the fdset */
  91         int  wcheck;
  92 /** set to one if we have sent the TERM signal to \a wpid */
  93         int wkilled;
  94 /** the receiver info associated with this slot */
  95         struct receiver_node *receiver_node;
  96 /** the active filter chain */
  97         struct filter_chain_info *fci;
  98 };
  99
 100 static struct slot_info slot[MAX_STREAM_SLOTS];
 101
 102 /** defines one command of para_audiod */
 103 struct audiod_command {
 104 /** the name of the command */
 105 const char *name;
 106 /** pointer to the function that handles the command */
 107 int (*handler)(int, int, char**);
 108 int (*line_handler)(int, char*);
 109 /** one-line description of the command */
 110 const char *description;
 111 /** summary of the command line options */
 112 const char *synopsis;
 113 /** the long help text */
 114 const char *help;
 115 };
 116
 117 extern const char *status_item_list[NUM_STAT_ITEMS];
 118
 119 static int com_grab(int, char *);
 120 static int com_cycle(int, int, char **);
 121 static int com_help(int, int, char **);
 122 static int com_off(int, int, char **);
 123 static int com_on(int, int, char **);
 124 static int com_sb(int, int, char **);
 125 static int com_stat(int, int, char **);
 126 static int com_term(int, int, char **);
 127 static int stat_pipe = -1, signal_pipe;
 128
 129 static struct gengetopt_args_info conf;
 130 static struct timeval server_stream_start, sa_time_diff;
 131 static int playing, current_decoder = -1,
 132         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 133         sa_time_diff_sign = 1, audiod_socket = -1;
 134 static char *af_status, /* the audio format announced in server status */
 135         *socket_name, *hostname;
 136 static char *stat_item_values[NUM_STAT_ITEMS];
 137 static FILE *logfile;
 138 static const struct timeval restart_delay = {0, 300 * 1000};
 139
 140 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 141
 142 static struct audiod_command cmds[] = {
 143 {
 144 .name = "cycle",
 145 .handler = com_cycle,
 146 .description = "switch to next mode",
 147 .synopsis = "cycle",
 148 .help =
 149
 150 "on -> standby -> off -> on\n"
 151
 152 },
 153 {
 154 .name = "grab",
 155 .line_handler = com_grab,
 156 .description = "grab the audio stream",
 157 .synopsis = "-- grab [grab_options]",
 158 .help =
 159
 160 "grab ('splice') the audio stream at any position in the filter      \n"
 161 "chain and send that data back to the client. Try\n"
 162 "\t para_audioc -- grab -h\n"
 163 "for the list of available options.\n"
 164 },
 165
 166 {
 167 .name = "help",
 168 .handler = com_help,
 169 .description = "display command list or help for given command",
 170 .synopsis = "help [command]",
 171 .help =
 172
 173 "When I was younger, so much younger than today, I never needed\n"
 174 "anybody's help in any way. But now these days are gone, I'm not so\n"
 175 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 176 "\n"
 177 "                               -- Beatles: Help\n"
 178
 179 },
 180 {
 181 .name = "off",
 182 .handler = com_off,
 183 .description = "deactivate para_audiod",
 184 .synopsis = "off",
 185 .help =
 186
 187 "Close connection to para_server and stop all decoders.\n"
 188
 189 },
 190 {
 191 .name = "on",
 192 .handler = com_on,
 193 .description = "activate para_audiod",
 194 .synopsis = "on",
 195 .help =
 196
 197 "Establish connection to para_server, retrieve para_server's current\n"
 198 "status. If playing, start corresponding decoder. Otherwise stop\n"
 199 "all decoders.\n"
 200
 201 },
 202 {
 203 .name = "sb",
 204 .handler = com_sb,
 205 .description = "enter standby mode",
 206 .synopsis = "sb",
 207 .help =
 208
 209 "Stop all decoders but leave connection to para_server open.\n"
 210
 211 },
 212 {
 213 .name = "stat",
 214 .handler = com_stat,
 215 .description = "print status information",
 216 .synopsis = "stat [item1 ...]",
 217 .help =
 218
 219 "Dump given status items (all if none given) to stdout.\n"
 220
 221 },
 222 {
 223 .name = "term",
 224 .handler = com_term,
 225 .description = "terminate audiod",
 226 .synopsis = "term",
 227 .help =
 228
 229 "Stop all decoders, shut down connection to para_server and exit.\n"
 230
 231 },
 232 {
 233 .name = NULL,
 234 }
 235 };
 236
 237 /** iterate over all slots */
 238 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
 239 /** iterate over all supported audio formats */
 240 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 241 /** iterate over the array of all audiod commands */
 242 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 243
 244 /**
 245  * get the audio format number
 246  * \param name the name of the audio format
 247  *
 248  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 249  * \a name is not a supported audio format.
 250  */
 251 int get_audio_format_num(char *name)
 252 {
 253         int i;
 254         FOR_EACH_AUDIO_FORMAT(i)
 255                 if (!strcmp(name, audio_formats[i]))
 256                         return i;
 257         return -E_UNSUPPORTED_AUDIO_FORMAT;
 258 }
 259
 260 /*
 261  * log function. first argument is loglevel.
 262  */
 263 void para_log(int ll, const char* fmt,...)
 264 {
 265         va_list argp;
 266         FILE *outfd;
 267         struct tm *tm;
 268         time_t t1;
 269         char str[MAXLINE] = "";
 270
 271         if (ll < conf.loglevel_arg)
 272                 return;
 273         outfd = logfile? logfile : stderr;
 274         time(&t1);
 275         tm = localtime(&t1);
 276         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 277         fprintf(outfd, "%s %s ", str, hostname);
 278         if (conf.loglevel_arg <= INFO)
 279                 fprintf(outfd, "%i ", ll);
 280         va_start(argp, fmt);
 281         vfprintf(outfd, fmt, argp);
 282         va_end(argp);
 283 }
 284
 285 static int client_write(int fd, const char *buf)
 286 {
 287         size_t len = strlen(buf);
 288         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 289 }
 290
 291 static char *get_time_string(struct timeval *newest_stime)
 292 {
 293         struct timeval now, diff, adj_stream_start, tmp;
 294         int total = 0, use_server_time = 1;
 295
 296         if (!playing) {
 297                 if (length_seconds)
 298                         return NULL;
 299                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 300         }
 301         if (audiod_status == AUDIOD_OFF)
 302                 goto out;
 303         if (sa_time_diff_sign > 0)
 304                 tv_diff(&server_stream_start, &sa_time_diff,
 305                         &adj_stream_start);
 306         else
 307                 tv_add(&server_stream_start, &sa_time_diff,
 308                         &adj_stream_start);
 309         tmp = adj_stream_start;
 310         if (newest_stime && audiod_status == AUDIOD_ON) {
 311                 tv_diff(newest_stime, &adj_stream_start, &diff);
 312                 if (tv2ms(&diff) < 5000) {
 313                         tmp = *newest_stime;
 314                         use_server_time = 0;
 315                 }
 316         }
 317         gettimeofday(&now, NULL);
 318         tv_diff(&now, &tmp, &diff);
 319         total = diff.tv_sec + offset_seconds;
 320         if (total > length_seconds)
 321                 total = length_seconds;
 322         if (total < 0)
 323                 total = 0;
 324 out:
 325         return make_message(
 326                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 327                 status_item_list[SI_PLAY_TIME],
 328                 use_server_time? "~" : "",
 329                 total / 60,
 330                 total % 60,
 331                 (length_seconds - total) / 60,
 332                 (length_seconds - total) % 60,
 333                 length_seconds? (total * 100 + length_seconds / 2) /
 334                         length_seconds : 0,
 335                 length_seconds / 60,
 336                 length_seconds % 60
 337         );
 338 }
 339
 340 __malloc static char *audiod_status_string(void)
 341 {
 342         const char *status = (audiod_status == AUDIOD_ON)?
 343                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 344         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 345 }
 346
 347 static struct timeval *wstime(void)
 348 {
 349         int i;
 350         struct timeval *max = NULL;
 351         FOR_EACH_SLOT(i) {
 352                 struct slot_info *s = &slot[i];
 353                 if (s->wpid <= 0)
 354                         continue;
 355                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 356                         continue;
 357                 max = &s->wstime;
 358         }
 359         return max;
 360 }
 361 __malloc static char *decoder_flags(void)
 362 {
 363         int i;
 364         char decoder_flags[MAX_STREAM_SLOTS + 1];
 365
 366         FOR_EACH_SLOT(i) {
 367                 struct slot_info *s = &slot[i];
 368                 char flag = '0';
 369                 if (s->receiver_node)
 370                         flag += 1;
 371                 if (s->wpid > 0)
 372                         flag += 2;
 373                 decoder_flags[i] = flag;
 374         }
 375         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 376         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 377                 decoder_flags);
 378 }
 379
 380 static char *configfile_exists(void)
 381 {
 382         static char *config_file;
 383
 384         if (!config_file) {
 385                 char *home = para_homedir();
 386                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 387                 free(home);
 388         }
 389         return file_exists(config_file)? config_file : NULL;
 390 }
 391
 392 static void setup_signal_handling(void)
 393 {
 394         signal_pipe = para_signal_init();
 395         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 396         para_install_sighandler(SIGINT);
 397         para_install_sighandler(SIGTERM);
 398         para_install_sighandler(SIGCHLD);
 399         para_install_sighandler(SIGHUP);
 400         signal(SIGPIPE, SIG_IGN);
 401 }
 402
 403 static void audiod_status_dump(void)
 404 {
 405         static char *p_ts, *p_us, *p_as, *p_df;
 406         struct timeval *t = wstime();
 407         char *us, *tmp = get_time_string(t);
 408
 409         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 410                 stat_client_write(tmp, SI_PLAY_TIME);
 411         free(p_ts);
 412         p_ts = tmp;
 413
 414         us = uptime_str();
 415         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 416         free(us);
 417         if (!p_us || strcmp(p_us, tmp))
 418                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 419         free(p_us);
 420         p_us = tmp;
 421
 422         tmp = audiod_status_string();
 423         if (!p_as || strcmp(p_as, tmp))
 424                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 425         free(p_as);
 426         p_as = tmp;
 427
 428         tmp = decoder_flags();
 429         if (!p_df || strcmp(p_df, tmp))
 430                 stat_client_write(tmp, SI_DECODER_FLAGS);
 431         free(p_df);
 432         p_df = tmp;
 433 }
 434
 435 static void clear_slot(int slot_num)
 436 {
 437         struct slot_info *s = &slot[slot_num];
 438
 439         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 440         memset(s, 0, sizeof(struct slot_info));
 441         s->format = -1;
 442 }
 443
 444 static void kill_stream_writer(int slot_num)
 445 {
 446         struct slot_info *s = &slot[slot_num];
 447
 448         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 449                 return;
 450         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 451                 s->wpid, audio_formats[s->format], slot_num);
 452         kill(s->wpid, SIGTERM);
 453         s->wkilled = 1;
 454         s->fci->error = 1;
 455 }
 456
 457 static void set_restart_barrier(int format, struct timeval *now)
 458 {
 459         struct timeval tmp;
 460
 461         if (now)
 462                 tmp = *now;
 463         else
 464                 gettimeofday(&tmp, NULL);
 465         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 466 }
 467
 468 static void close_receiver(int slot_num)
 469 {
 470         struct slot_info *s = &slot[slot_num];
 471         struct audio_format_info *a;
 472
 473         if (s->format < 0 || !s->receiver_node)
 474                 return;
 475         a = &afi[s->format];
 476         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 477                 audio_formats[s->format] , slot_num);
 478         a->receiver->close(s->receiver_node);
 479         free(s->receiver_node);
 480         s->receiver_node = NULL;
 481         set_restart_barrier(s->format, NULL);
 482 }
 483
 484 static void kill_all_decoders(void)
 485 {
 486         int i;
 487
 488         FOR_EACH_SLOT(i)
 489                 if (slot[i].format >= 0) {
 490                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 491                         kill_stream_writer(i);
 492                 }
 493 }
 494
 495 static void check_sigchld(void)
 496 {
 497         pid_t pid;
 498         int i;
 499         struct timeval now;
 500         gettimeofday(&now, NULL);
 501
 502 reap_next_child:
 503         pid = para_reap_child();
 504         if (pid <= 0)
 505                 return;
 506         FOR_EACH_SLOT(i) {
 507                 struct slot_info *s = &slot[i];
 508                 long lifetime;
 509                 if (s->format < 0)
 510                         continue;
 511                 if (pid == s->wpid) {
 512                         s->wpid = -1;
 513                         lifetime = now.tv_sec - s->wstime.tv_sec;
 514                         PARA_INFO_LOG("%s stream writer in slot %d died "
 515                                 "after %li secs\n",
 516                                 audio_formats[s->format], i, lifetime);
 517                         set_restart_barrier(s->format, &now);
 518                         goto reap_next_child;
 519                 }
 520         }
 521         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 522         goto reap_next_child;
 523 }
 524
 525 static int get_empty_slot(void)
 526 {
 527         int i;
 528         struct slot_info *s;
 529
 530         FOR_EACH_SLOT(i) {
 531                 s = &slot[i];
 532                 if (s->format < 0) {
 533                         clear_slot(i);
 534                         return i;
 535                 }
 536                 if (s->write_fd > 0 || s->wpid > 0)
 537                         continue;
 538                 if (s->receiver_node)
 539                         continue;
 540                 if (s->fci)
 541                         continue;
 542                 clear_slot(i);
 543                 return i;
 544         }
 545         return -E_NO_MORE_SLOTS;
 546 }
 547
 548 static int decoder_running(int format)
 549 {
 550         int i, ret = 0;
 551         struct slot_info *s;
 552
 553         FOR_EACH_SLOT(i) {
 554                 s = &slot[i];
 555                 if (s->format == format && s->receiver_node)
 556                         ret |= 1;
 557                 if (s->format == format && s->wpid > 0)
 558                         ret |= 2;
 559         }
 560         return ret;
 561 }
 562
 563 static void close_stat_pipe(void)
 564 {
 565         int i;
 566
 567         if (stat_pipe < 0)
 568                 return;
 569         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 570         close(stat_pipe);
 571         del_close_on_fork_list(stat_pipe);
 572         stat_pipe = -1;
 573         kill_all_decoders();
 574         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 575                 free(stat_item_values[i]);
 576                 stat_item_values[i] = NULL;
 577         }
 578         dump_empty_status();
 579         length_seconds = 0;
 580         offset_seconds = 0;
 581         audiod_status_dump();
 582         playing = 0;
 583         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 584                 status_item_list[SI_STATUS_BAR]);
 585         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 586 }
 587
 588 static void __noreturn clean_exit(int status, const char *msg)
 589 {
 590         PARA_EMERG_LOG("%s\n", msg);
 591         kill_all_decoders();
 592         if (socket_name)
 593                 unlink(socket_name);
 594         if (stat_pipe >= 0)
 595                 close_stat_pipe();
 596         exit(status);
 597 }
 598
 599 __malloc static char *glob_cmd(char *cmd)
 600 {
 601         char *ret, *replacement;
 602         struct timeval tmp, delay, rss; /* real stream start */
 603
 604         delay.tv_sec = conf.stream_delay_arg / 1000;
 605         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 606 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 607         if (sa_time_diff_sign < 0)
 608                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 609         else
 610                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 611         tv_add(&rss, &delay, &tmp);
 612         replacement = make_message("%lu:%lu",
 613                 (long unsigned)tmp.tv_sec,
 614                 (long unsigned)tmp.tv_usec);
 615         ret = s_a_r(cmd, "STREAM_START", replacement);
 616         free(replacement);
 617         if (!ret)
 618                 goto out;
 619         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 620 out:
 621         return ret;
 622 }
 623
 624 /** get the number of filters for the given audio format */
 625 int num_filters(int audio_format_num)
 626 {
 627         return afi[audio_format_num].num_filters;
 628 }
 629
 630 static void open_filters(int slot_num)
 631 {
 632         struct slot_info *s = &slot[slot_num];
 633         struct audio_format_info *a = &afi[s->format];
 634         int nf = a->num_filters;
 635         int i;
 636
 637         s->fci = para_calloc(sizeof(struct filter_chain_info));
 638         INIT_LIST_HEAD(&s->fci->filters);
 639         if (!nf)
 640                 return;
 641         s->fci->inbuf = s->receiver_node->buf;
 642         s->fci->in_loaded = &s->receiver_node->loaded;
 643         s->fci->outbuf = s->receiver_node->buf;
 644         s->fci->out_loaded = &s->receiver_node->loaded;
 645         s->fci->eof = &s->receiver_node->eof;
 646         for (i = 0; i < nf; i++) {
 647                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 648                 fn->conf = a->filter_conf[i];
 649                 fn->fci = s->fci;
 650                 fn->filter = a->filters[i];
 651                 INIT_LIST_HEAD(&fn->callbacks);
 652                 list_add_tail(&fn->node, &s->fci->filters);
 653                 fn->filter->open(fn);
 654                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 655                         audio_formats[s->format], i + 1,  nf,
 656                         fn->filter->name, slot_num);
 657                 s->fci->outbuf = fn->buf;
 658                 s->fci->out_loaded = &fn->loaded;
 659         }
 660         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 661                 s->fci->outbuf);
 662 }
 663
 664 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 665 {
 666         struct filter_node *fn;
 667         int i, j;
 668
 669         FOR_EACH_SLOT(i) {
 670                 struct slot_info *s = &slot[i];
 671                 if (s->format < 0 || !s->fci)
 672                         continue;
 673                 if (slot_num >= 0 && slot_num != i)
 674                         continue;
 675                 if (format >= 0 && s->format != format)
 676                         continue;
 677                 if (num_filters(i) < filternum)
 678                         continue;
 679                 /* success */
 680                 j = 1;
 681                 list_for_each_entry(fn, &s->fci->filters, node)
 682                         if (filternum <= 0 || j++ == filternum)
 683                                 break;
 684                 return fn;
 685         }
 686         return NULL;
 687 }
 688
 689 static void start_stream_writer(int slot_num)
 690 {
 691         int ret, fds[3] = {1, -1, -1};
 692         struct slot_info *s = &slot[slot_num];
 693         struct audio_format_info *a = &afi[s->format];
 694         char *glob = NULL;
 695
 696         if (a->write_cmd)
 697                 glob = glob_cmd(a->write_cmd);
 698         if (!glob)
 699                 glob = para_strdup("para_write -w alsa");
 700         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 701         open_filters(slot_num);
 702         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 703         free(glob);
 704         if (ret < 0) {
 705                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 706                 return;
 707         }
 708         s->write_fd = fds[0];
 709         add_close_on_fork_list(s->write_fd);
 710         /* we write to this fd in do_select, so we need non-blocking */
 711         mark_fd_nonblock(s->write_fd);
 712         gettimeofday(&s->wstime, NULL);
 713         current_decoder = slot_num;
 714         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 715 }
 716
 717 static void open_receiver(int format)
 718 {
 719         struct audio_format_info *a = &afi[format];
 720         struct slot_info *s;
 721         int ret, slot_num;
 722
 723         slot_num = get_empty_slot();
 724         if (slot_num < 0)
 725                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 726         s = &slot[slot_num];
 727         s->format = format;
 728         gettimeofday(&s->rtime, NULL);
 729         s->wtime = s->rtime;
 730         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 731         s->receiver_node->conf = a->receiver_conf;
 732         ret = a->receiver->open(s->receiver_node);
 733         if (ret < 0) {
 734                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 735                         PARA_STRERROR(-ret));
 736                 free(s->receiver_node);
 737                 s->receiver_node = NULL;
 738                 return;
 739         }
 740         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 741                 audio_formats[s->format], a->receiver->name, slot_num);
 742 }
 743
 744 static int is_frozen(int format)
 745 {
 746         struct timeval now;
 747         struct audio_format_info *a = &afi[format];
 748
 749         gettimeofday(&now, NULL);
 750         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 751 }
 752
 753 static void start_current_receiver(void)
 754 {
 755         int i;
 756
 757         if (!af_status)
 758                 return;
 759         i = get_audio_format_num(af_status);
 760         if (i < 0)
 761                 return;
 762         if ((decoder_running(i) & 1) || is_frozen(i))
 763                 return;
 764         open_receiver(i);
 765 }
 766
 767 static void compute_time_diff(const struct timeval *status_time)
 768 {
 769         struct timeval now, tmp, diff;
 770         static int count;
 771         int sign;
 772         const struct timeval max_deviation = {0, 500 * 1000};
 773         const int time_smooth = 5;
 774
 775         gettimeofday(&now, NULL);
 776         sign = tv_diff(status_time, &now, &diff);
 777 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 778 //                      sign, sa_time_diff_sign);
 779         if (!count) {
 780                 sa_time_diff_sign = sign;
 781                 sa_time_diff = diff;
 782                 count++;
 783                 return;
 784         }
 785         if (count > 5) {
 786                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 787                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 788                         PARA_WARNING_LOG("time diff jump: %lims\n",
 789                                 s * tv2ms(&tmp));
 790         }
 791         count++;
 792         sa_time_diff_sign = tv_convex_combination(
 793                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 794                 count > 10? sign : sign * time_smooth, &diff,
 795                 &tmp);
 796         sa_time_diff = tmp;
 797         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 798                 sign > 0? "+" : "-",
 799                 tv2ms(&diff),
 800                 sa_time_diff_sign ? "+" : "-",
 801                 tv2ms(&sa_time_diff)
 802         );
 803 }
 804
 805 static void check_stat_line(char *line)
 806 {
 807         int itemnum;
 808         size_t ilen = 0;
 809         long unsigned sec, usec;
 810         char *tmp;
 811
 812 //      PARA_INFO_LOG("line: %s\n", line);
 813         if (!line)
 814                 return;
 815         itemnum = stat_line_valid(line);
 816         if (itemnum < 0) {
 817                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 818                 return;
 819         }
 820         tmp = make_message("%s\n", line);
 821         stat_client_write(tmp, itemnum);
 822         free(tmp);
 823         free(stat_item_values[itemnum]);
 824         stat_item_values[itemnum] = para_strdup(line);
 825         ilen = strlen(status_item_list[itemnum]);
 826         switch (itemnum) {
 827         case SI_STATUS:
 828                 playing = strstr(line, "playing")? 1 : 0;
 829                 break;
 830         case SI_FORMAT:
 831                 free(af_status);
 832                 af_status = para_strdup(line + ilen + 1);
 833                 break;
 834         case SI_OFFSET:
 835                 offset_seconds = atoi(line + ilen + 1);
 836                 break;
 837         case SI_LENGTH:
 838                 length_seconds = atoi(line + ilen + 1);
 839                 break;
 840         case SI_STREAM_START:
 841                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 842                         server_stream_start.tv_sec = sec;
 843                         server_stream_start.tv_usec = usec;
 844                 }
 845                 break;
 846         case SI_CURRENT_TIME:
 847                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 848                         struct timeval tv = {sec, usec};
 849                         compute_time_diff(&tv);
 850                 }
 851                 break;
 852         }
 853 }
 854
 855 static void handle_signal(int sig)
 856 {
 857         switch (sig) {
 858         case SIGCHLD:
 859                 return check_sigchld();
 860         case SIGINT:
 861         case SIGTERM:
 862         case SIGHUP:
 863                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 864                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 865                 return;
 866         }
 867 }
 868
 869 static void check_timeouts(void)
 870 {
 871         struct timeval now;
 872         int slot_num, timeout = conf.stream_timeout_arg;
 873
 874         gettimeofday(&now, NULL);
 875         FOR_EACH_SLOT(slot_num) {
 876                 struct slot_info *s = &slot[slot_num];
 877                 if (s->format < 0)
 878                         continue;
 879                 /* check read time */
 880                 if (s->receiver_node &&
 881                         now.tv_sec > s->rtime.tv_sec + timeout) {
 882                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 883                                 audio_formats[s->format], slot_num);
 884                         if (s->fci)
 885                                 s->fci->error = 42;
 886                         else
 887                                 close_receiver(slot_num);
 888                 }
 889                 /* check write time */
 890                 if (s->wpid > 0 && !s->wkilled &&
 891                         now.tv_sec > s->wtime.tv_sec + timeout) {
 892                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 893                                 audio_formats[s->format], slot_num);
 894                         if (s->fci)
 895                                 s->fci->error = 42;
 896                         kill_stream_writer(slot_num);
 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("err: %d\n", s->fci->error);
 941                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 942                         s->write_fd);
 943                 close(s->write_fd);
 944                 del_close_on_fork_list(s->write_fd);
 945                 s->write_fd = -1;
 946         }
 947         if (s->wpid > 0)
 948                 return; /* wait until writer dies before closing filters */
 949         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 950                 slot_num, s->fci);
 951         close_filters(s->fci);
 952         free(s->fci);
 953         close_receiver(slot_num);
 954         clear_slot(slot_num);
 955 }
 956
 957 static void set_stream_fds(fd_set *wfds, int *max_fileno)
 958 {
 959         int i;
 960
 961         check_timeouts();
 962         FOR_EACH_SLOT(i) {
 963                 struct slot_info *s = &slot[i];
 964                 struct audio_format_info *a;
 965                 struct receiver_node *rn;
 966
 967                 close_decoder_if_idle(i);
 968                 s->wcheck = 0;
 969                 if (s->format < 0)
 970                         continue;
 971                 a = &afi[s->format];
 972                 rn = s->receiver_node;
 973                 if (rn && rn->loaded && !s->wpid) {
 974                         PARA_INFO_LOG("no writer in slot %d\n", i);
 975                         start_stream_writer(i);
 976                 }
 977                 if (s->write_fd <= 0)
 978                         continue;
 979                 if (!get_loaded_bytes(i))
 980                         continue;
 981                 para_fd_set(s->write_fd, wfds, max_fileno);
 982                 s->wcheck = 1;
 983         }
 984 }
 985
 986 static int write_audio_data(int slot_num)
 987 {
 988         struct slot_info *s = &slot[slot_num];
 989         struct audio_format_info *a = &afi[s->format];
 990         struct receiver_node *rn = s->receiver_node;
 991         int rv;
 992         char **buf;
 993         size_t *len;
 994
 995         if (a->num_filters) {
 996                 buf = &s->fci->outbuf;
 997                 len = s->fci->out_loaded;
 998         } else {
 999                 buf = &rn->buf;
1000                 len = &rn->loaded;
1001         }
1002         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1003         rv = write(s->write_fd, *buf, *len);
1004         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1005         if (rv < 0) {
1006                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1007                         slot_num, s->write_fd, strerror(errno));
1008                 *len = 0;
1009                 s->fci->error = E_WRITE_AUDIO_DATA;
1010         } else if (rv != *len) {
1011                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1012                         audio_formats[s->format], rv, *len, slot_num);
1013                 *len -= rv;
1014                 memmove(*buf, *buf + rv, *len);
1015         } else
1016                 *len = 0;
1017         if (rv > 0)
1018                 gettimeofday(&s->wtime, NULL);
1019         return rv;
1020 }
1021
1022 static void slot_io(fd_set *wfds)
1023 {
1024         int ret, i;
1025
1026         FOR_EACH_SLOT(i) {
1027                 struct slot_info *s = &slot[i];
1028                 struct receiver_node *rn = s->receiver_node;
1029
1030                 if (rn && rn->loaded)
1031                         gettimeofday(&s->rtime, NULL);
1032                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1033                         ret = filter_io(s->fci);
1034                         if (ret < 0)
1035                                 s->fci->error = -ret;
1036 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1037 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1038                 }
1039                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1040                         continue;
1041                 write_audio_data(i);
1042         }
1043 }
1044
1045 static int parse_stream_command(const char *txt, char **cmd)
1046 {
1047         char *p = strchr(txt, ':');
1048         int i;
1049
1050         if (!p)
1051                 return -E_MISSING_COLON;
1052         p++;
1053         FOR_EACH_AUDIO_FORMAT(i) {
1054                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1055                         continue;
1056                 *cmd = p;
1057                 return i;
1058         }
1059         return -E_UNSUPPORTED_AUDIO_FORMAT;
1060 }
1061
1062 static int add_filter(int format, char *cmdline)
1063 {
1064         struct audio_format_info *a = &afi[format];
1065         int filter_num, nf = a->num_filters;
1066
1067         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1068         if (filter_num < 0)
1069                 return filter_num;
1070         a->filters[nf] = &filters[filter_num];
1071         a->num_filters++;
1072         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1073                 a->filters[nf]->name);
1074         return filter_num;
1075 }
1076
1077 static int setup_default_filters(void)
1078 {
1079         int i, ret = 1;
1080
1081         FOR_EACH_AUDIO_FORMAT(i) {
1082                 struct audio_format_info *a = &afi[i];
1083                 char *tmp;
1084                 int j;
1085                 if (a->num_filters)
1086                         continue;
1087                 /* add "dec" to audio format name */
1088                 tmp = make_message("%sdec", audio_formats[i]);
1089                 for (j = 0; filters[j].name; j++)
1090                         if (!strcmp(tmp, filters[j].name))
1091                                 break;
1092                 free(tmp);
1093                 ret = -E_UNSUPPORTED_FILTER;
1094                 if (!filters[j].name)
1095                         goto out;
1096                 tmp = para_strdup(filters[j].name);
1097                 ret = add_filter(i, tmp);
1098                 free(tmp);
1099                 if (ret < 0)
1100                         goto out;
1101                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1102                         filters[j].name);
1103                 ret = add_filter(i, "wav");
1104                 if (ret < 0)
1105                         goto out;
1106                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1107         }
1108 out:
1109         return ret;
1110 }
1111
1112 static int init_stream_io(void)
1113 {
1114         int i, ret, receiver_num, nf;
1115         char *cmd;
1116
1117         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1118                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1119                 if (ret < 0)
1120                         goto out;
1121                 afi[ret].write_cmd = para_strdup(cmd);
1122                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1123         }
1124         for (i = 0; receivers[i].name; i++) {
1125                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1126                 receivers[i].init(&receivers[i]);
1127         }
1128         for (i = 0; i < conf.receiver_given; i++) {
1129                 char *arg = conf.receiver_arg[i];
1130                 char *recv = strchr(arg, ':');
1131                 ret = -E_MISSING_COLON;
1132                 if (!recv)
1133                         goto out;
1134                 *recv = '\0';
1135                 recv++;
1136                 ret = get_audio_format_num(arg);
1137                 if (ret < 0)
1138                         goto out;
1139                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1140                 if (!afi[ret].receiver_conf) {
1141                         ret = -E_RECV_SYNTAX;
1142                         goto out;
1143                 }
1144                 afi[ret].receiver = &receivers[receiver_num];
1145         }
1146         /* use the first available receiver with no arguments
1147          * for those audio formats for which no receiver
1148          * was specified
1149          */
1150         cmd = para_strdup(receivers[0].name);
1151         FOR_EACH_AUDIO_FORMAT(i) {
1152                 struct audio_format_info *a = &afi[i];
1153                 if (a->receiver_conf)
1154                         continue;
1155                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1156                 if (!a->receiver_conf)
1157                         return -E_RECV_SYNTAX;
1158                 a->receiver = &receivers[receiver_num];
1159         }
1160         free(cmd);
1161         /* filters */
1162         filter_init(filters);
1163         nf = PARA_MAX(2,  conf.filter_given) + 1;
1164         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1165         FOR_EACH_AUDIO_FORMAT(i) {
1166                 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1167                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1168         }
1169         if (!conf.no_default_filters_given)
1170                 return setup_default_filters();
1171         for (i = 0; i < conf.filter_given; i++) {
1172                 char *arg = conf.filter_arg[i];
1173                 char *filter_name = strchr(arg, ':');
1174                 ret = -E_MISSING_COLON;
1175                 if (!filter_name)
1176                         goto out;
1177                 *filter_name = '\0';
1178                 filter_name++;
1179                 ret = get_audio_format_num(arg);
1180                 if (ret < 0)
1181                         goto out;
1182                 ret = add_filter(ret, filter_name);
1183                 if (ret < 0)
1184                         goto out;
1185         }
1186         ret = 1;
1187 out:
1188         return ret;
1189 }
1190
1191 static int dump_commands(int fd)
1192 {
1193         char *buf = para_strdup(""), *tmp = NULL;
1194         int i;
1195         ssize_t ret;
1196
1197         FOR_EACH_COMMAND(i) {
1198                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1199                         cmds[i].description);
1200                 free(buf);
1201                 buf = tmp;
1202         }
1203         ret = client_write(fd, buf);
1204         free(buf);
1205         return ret;
1206 }
1207
1208 /*
1209  * command handlers don't close their fd on errors (ret < 0) so that
1210  * its caller can send an error message. Otherwise (ret >= 0) it's up
1211  * to each individual command to close the fd if necessary.
1212  */
1213
1214 static int com_help(int fd, int argc, char **argv)
1215 {
1216         int i, ret;
1217         char *buf;
1218         const char *dflt = "No such command. Available commands:\n";
1219
1220         if (argc < 2) {
1221                 ret = dump_commands(fd);
1222                 goto out;
1223         }
1224         FOR_EACH_COMMAND(i) {
1225                 if (strcmp(cmds[i].name, argv[1]))
1226                         continue;
1227                 buf = make_message(
1228                         "NAME\n\t%s -- %s\n"
1229                         "SYNOPSIS\n\tpara_audioc %s\n"
1230                         "DESCRIPTION\n%s\n",
1231                         argv[1],
1232                         cmds[i].description,
1233                         cmds[i].synopsis,
1234                         cmds[i].help
1235                 );
1236                 ret = client_write(fd, buf);
1237                 free(buf);
1238                 goto out;
1239         }
1240         ret = client_write(fd, dflt);
1241         if (ret > 0)
1242                 ret = dump_commands(fd);
1243 out:
1244         if (ret >= 0)
1245                 close(fd);
1246         return ret;
1247 }
1248
1249 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1250 {
1251         int i, ret;
1252         char *buf = NULL;
1253         long unsigned mask = ~0LU;
1254
1255         if (argc > 1) {
1256                 mask = 0;
1257                 for (i = 1; i < argc; i++) {
1258                         ret = stat_item_valid(argv[i]);
1259                         if (ret < 0)
1260                                 return ret;
1261                         mask |= (1 << ret);
1262                 }
1263         }
1264         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1265         if (mask & (1 << SI_PLAY_TIME)) {
1266                 struct timeval *t = wstime();
1267                 char *ts = get_time_string(t);
1268                 if (ts) {
1269                         ret = client_write(fd, ts);
1270                         if (ret < 0)
1271                                 goto out;
1272                         free(ts);
1273                 }
1274         }
1275         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1276                 char *tmp, *us = uptime_str();
1277                 tmp = make_message("%s:%s\n",
1278                         status_item_list[SI_AUDIOD_UPTIME], us);
1279                 free(us);
1280                 ret = client_write(fd, tmp);
1281                 if (ret < 0)
1282                         goto out;
1283                 free(tmp);
1284         }
1285         if (mask & (1 << SI_AUDIOD_STATUS)) {
1286                 char *s = audiod_status_string();
1287                 ret = client_write(fd, s);
1288                 if (ret < 0)
1289                         goto out;
1290                 free(s);
1291         }
1292         if (mask & (1 << SI_DECODER_FLAGS)) {
1293                 char *df =decoder_flags();
1294                 ret = client_write(fd, df);
1295                 if (ret < 0)
1296                         goto out;
1297                 free(df);
1298         }
1299
1300         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1301                 char *tmp, *v;
1302                 if (!((1 << i) & mask))
1303                         continue;
1304                 v = stat_item_values[i];
1305                 tmp = make_message("%s%s%s", buf? buf: "",
1306                         v? v : "", v? "\n" : "");
1307                 free(buf);
1308                 buf = tmp;
1309         }
1310         ret = client_write(fd, buf);
1311 out:
1312         if (ret > 0)
1313                 ret = stat_client_add(fd, mask);
1314         free(buf);
1315         return ret;
1316 }
1317
1318 #if 0
1319 static char *list_filters(void)
1320 {
1321         int i, j;
1322         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1323
1324         FOR_EACH_AUDIO_FORMAT(i) {
1325                 for (j = 0; j < afi[i].num_filters; j++) {
1326                         tmp = make_message("%s\t%i\t%s\n",
1327                                 afi[i].name, j, afi[i].filter_cmds[j]);
1328                         msg = para_strcat(msg, tmp);
1329                         free(tmp);
1330                 }
1331                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1332                         j, afi[i].write_cmd);
1333                 msg = para_strcat(msg, tmp);
1334                 free(tmp);
1335         }
1336         return msg;
1337 }
1338 #endif
1339
1340
1341 static int com_grab(int fd, char *cmdline)
1342 {
1343         struct grab_client *gc;
1344         struct filter_node *fn;
1345         int i, err;
1346         char *msg;
1347
1348         gc = grab_client_new(fd, cmdline, &err);
1349         if (!gc)
1350                 goto err_out;
1351         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1352         if (fn)
1353                 activate_grab_client(gc, fn);
1354         return 1;
1355 err_out:
1356         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1357                 return err;
1358         if (err == -E_GC_HELP_GIVEN) {
1359                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1360                 for (i = 0; grab_client_args_info_help[i]; i++) {
1361                         char *tmp = make_message("%s%s\n", msg,
1362                                 grab_client_args_info_help[i]);
1363                         free(msg);
1364                         msg = tmp;
1365                 }
1366         } else
1367                 msg = make_message("%s %s\n",
1368                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1369                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1370         err = client_write(fd, msg);
1371         free(msg);
1372         if (err < 0)
1373                 return err;
1374         close(fd);
1375         return 1;
1376 }
1377
1378 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1379 {
1380         close(fd);
1381         clean_exit(EXIT_SUCCESS, "terminating on user request");
1382 }
1383
1384 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1385 {
1386         audiod_status = AUDIOD_ON;
1387         close(fd);
1388         return 1;
1389 }
1390
1391 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1392 {
1393         audiod_status = AUDIOD_OFF;
1394         close(fd);
1395         return 1;
1396 }
1397
1398 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1399 {
1400         audiod_status = AUDIOD_STANDBY;
1401         close(fd);
1402         return 1;
1403 }
1404
1405 static int com_cycle(int fd, int argc, char **argv)
1406 {
1407         switch (audiod_status) {
1408                 case  AUDIOD_ON:
1409                         return com_sb(fd, argc, argv);
1410                         break;
1411                 case  AUDIOD_OFF:
1412                         return com_on(fd, argc, argv);
1413                         break;
1414                 case  AUDIOD_STANDBY:
1415                         return com_off(fd, argc, argv);
1416                         break;
1417         }
1418         close(fd);
1419         return 1;
1420 }
1421
1422 static int check_perms(uid_t uid)
1423 {
1424         int i;
1425
1426         if (!conf.user_allow_given)
1427                 return 1;
1428         for (i = 0; i < conf.user_allow_given; i++)
1429                 if (uid == conf.user_allow_arg[i])
1430                         return 1;
1431         return -E_UCRED_PERM;
1432 }
1433
1434 static int handle_connect(void)
1435 {
1436         int i, argc, ret, clifd = -1;
1437         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1438         struct sockaddr_un unix_addr;
1439
1440         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1441         if (ret < 0)
1442                 goto out;
1443         clifd = ret;
1444         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1445         if (ret < 0)
1446                 goto out;
1447         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1448         ret = check_perms(ret);
1449         if (ret < 0)
1450                 goto out;
1451         ret = -E_INVALID_AUDIOD_CMD;
1452         cmd = para_strdup(buf);
1453         p = strchr(cmd, '\n');
1454         if (!p)
1455                 p = "";
1456         else {
1457                 *p = '\0';
1458                 p++;
1459         }
1460         for (i = 0; cmds[i].name; i++) {
1461                 int j;
1462                 if (strcmp(cmds[i].name, cmd))
1463                         continue;
1464                 if (cmds[i].handler) {
1465                         argc = split_args(buf, &argv, "\n");
1466                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1467                         ret = cmds[i].handler(clifd, argc, argv);
1468                         goto out;
1469                 }
1470                 for (j = 0; p[j]; j++)
1471                         if (p[j] == '\n')
1472                                 p[j] = ' ';
1473                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1474                 ret = cmds[i].line_handler(clifd, p);
1475                 goto out;
1476         }
1477         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1478 out:
1479         free(cmd);
1480         free(buf);
1481         free(argv);
1482         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1483                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1484                 client_write(clifd, tmp);
1485                 free(tmp);
1486                 close(clifd);
1487         }
1488         return ret;
1489 }
1490
1491 static void audiod_get_socket(void)
1492 {
1493         struct sockaddr_un unix_addr;
1494
1495         if (conf.socket_given)
1496                 socket_name = para_strdup(conf.socket_arg);
1497         else {
1498                 char *hn = para_hostname();
1499                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1500                         hn);
1501                 free(hn);
1502         }
1503         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1504         if (conf.force_given)
1505                 unlink(socket_name);
1506         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1507                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1508         if (audiod_socket < 0) {
1509                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1510                 exit(EXIT_FAILURE); /* do not unlink socket */
1511         }
1512         if (listen(audiod_socket, 5) < 0) {
1513                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1514                 exit(EXIT_FAILURE); /* do not unlink socket */
1515         }
1516         add_close_on_fork_list(audiod_socket);
1517 }
1518
1519 static int open_stat_pipe(void)
1520 {
1521         int ret, fd[3] = {-1, 1, 0};
1522         pid_t pid;
1523         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1524         if (ret >= 0) {
1525                 ret = fd[1];
1526                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1527                 add_close_on_fork_list(ret);
1528         } else
1529                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1530         return ret;
1531 }
1532
1533 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1534                 int *max_fileno)
1535 {
1536         int i, ret;
1537
1538         FOR_EACH_SLOT(i) {
1539                 struct slot_info *s = &slot[i];
1540                 struct audio_format_info *a;
1541                 struct receiver_node *rn = s->receiver_node;
1542                 if (s->format < 0 || !rn)
1543                         continue;
1544                 a = &afi[s->format];
1545                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1546 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1547                 *max_fileno = PARA_MAX(*max_fileno, ret);
1548         }
1549 }
1550 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1551 {
1552         int i, ret;
1553
1554         FOR_EACH_SLOT(i) {
1555                 struct slot_info *s = &slot[i];
1556                 struct audio_format_info *a;
1557                 struct receiver_node *rn = s->receiver_node;
1558                 if (s->format < 0 || !rn || rn->eof)
1559                         continue;
1560                 a = &afi[s->format];
1561                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1562                 if (ret <= 0) {
1563                         if (ret)
1564                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1565                                 a->receiver->name, PARA_STRERROR(-ret), i);
1566                         else
1567                                 PARA_INFO_LOG("eof in slot %d\n", i);
1568                         rn->eof = 1;
1569                 }
1570                 if (ret < 0 && s->fci)
1571                         s->fci->error = ret;
1572         }
1573 }
1574
1575 /* TODO: move everything before the select call to pre_select() */
1576 static void __noreturn audiod_mainloop(void)
1577 {
1578         fd_set rfds, wfds;
1579         int ret, max_fileno, sbo = 0;
1580         char status_buf[STRINGSIZE] = "";
1581         struct timeval tv;
1582 repeat:
1583         FD_ZERO(&wfds);
1584         FD_ZERO(&rfds);
1585         max_fileno = -1;
1586         /* always check signal pipe and the local socket */
1587         para_fd_set(signal_pipe, &rfds, &max_fileno);
1588         para_fd_set(audiod_socket, &rfds, &max_fileno);
1589
1590         if (audiod_status != AUDIOD_ON)
1591                 kill_all_decoders();
1592         else if (playing)
1593                 start_current_receiver();
1594
1595         set_stream_fds(&wfds, &max_fileno);
1596         /* status pipe */
1597         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1598                 close_stat_pipe();
1599         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1600                 stat_pipe = open_stat_pipe();
1601                 sbo = 0;
1602                 status_buf[0] = '\0';
1603         }
1604         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1605                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1606         /* local socket */
1607         tv.tv_sec = 0;
1608         tv.tv_usec = 200 * 1000;
1609         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1610         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1611         if (ret < 0)
1612                 goto repeat;
1613         if (audiod_status != AUDIOD_OFF)
1614                 audiod_status_dump();
1615         audiod_post_select(ret, &rfds, &wfds);
1616         /* read status pipe */
1617         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1618                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1619                 if (ret <= 0) {
1620                         close_stat_pipe();
1621                         /* avoid busy loop if server is down */
1622                         while (sleep(1) > 0)
1623                                 ; /* try again*/
1624                 } else {
1625                         status_buf[ret + sbo] = '\0';
1626                         sbo = for_each_line(status_buf, ret + sbo,
1627                                 &check_stat_line);
1628                 }
1629         }
1630         slot_io(&wfds);
1631         if (FD_ISSET(audiod_socket, &rfds)) {
1632                 ret = handle_connect();
1633                 if (ret < 0) {
1634                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1635                 }
1636         }
1637         /* signals */
1638         if (FD_ISSET(signal_pipe, &rfds)) {
1639                 int sig_nr = para_next_signal();
1640                 if (sig_nr > 0)
1641                         handle_signal(sig_nr);
1642         }
1643         goto repeat;
1644 }
1645
1646 static void set_initial_status(void)
1647 {
1648         audiod_status = AUDIOD_ON;
1649         if (!conf.mode_given)
1650                 return;
1651         if (!strcmp(conf.mode_arg, "sb")) {
1652                 audiod_status = AUDIOD_STANDBY;
1653                 return;
1654         }
1655         if (!strcmp(conf.mode_arg, "off")) {
1656                 audiod_status = AUDIOD_OFF;
1657                 return;
1658         }
1659         if (strcmp(conf.mode_arg, "on"))
1660                 PARA_WARNING_LOG("%s", "invalid mode\n");
1661 }
1662
1663 int __noreturn main(int argc, char *argv[])
1664 {
1665         char *cf;
1666         int i;
1667
1668         valid_fd_012();
1669         hostname = para_hostname();
1670         cmdline_parser(argc, argv, &conf);
1671         para_drop_privileges(conf.user_arg, conf.group_arg);
1672         cf = configfile_exists();
1673         if (cf) {
1674                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1675                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1676                         exit(EXIT_FAILURE);
1677                 }
1678         }
1679         if (conf.logfile_given)
1680                 logfile = open_log(conf.logfile_arg);
1681         log_welcome("para_audiod", conf.loglevel_arg);
1682         i = init_stream_io();
1683         if (i < 0) {
1684                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1685                 exit(EXIT_FAILURE);
1686         }
1687         server_uptime(UPTIME_SET);
1688         set_initial_status();
1689         FOR_EACH_SLOT(i)
1690                 clear_slot(i);
1691         init_grabbing();
1692         setup_signal_handling();
1693         if (conf.daemon_given)
1694                 daemon_init();
1695         audiod_get_socket(); /* doesn't return on errors */
1696         audiod_mainloop();
1697 }