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 *fc;
  98 };
  99 static struct slot_info slot[MAX_STREAM_SLOTS];
 100
 101 extern const char *status_item_list[NUM_STAT_ITEMS];
 102
 103 static struct gengetopt_args_info conf;
 104 static struct timeval server_stream_start, sa_time_diff;
 105 static int playing, current_decoder = -1,
 106         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 107         sa_time_diff_sign = 1;
 108 static char *af_status, /* the audio format announced in server status */
 109         *socket_name, *hostname;
 110 static char *stat_item_values[NUM_STAT_ITEMS];
 111 static FILE *logfile;
 112 static const struct timeval restart_delay = {0, 300 * 1000};
 113
 114 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 115
 116 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 117
 118 struct command_task {
 119         int fd;
 120         struct task task;
 121 };
 122 static struct command_task command_task_struct, *cmd_task = &command_task_struct;
 123
 124 struct status_task {
 125         int fd;
 126         struct task task;
 127         char buf[STRINGSIZE];
 128         unsigned loaded;
 129 };
 130 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 131
 132 struct audiod_task {
 133         struct task task;
 134 };
 135 static struct audiod_task audiod_task_struct, *at = &audiod_task_struct;
 136
 137 struct signal_task {
 138         int fd;
 139         int signum;
 140         struct task task;
 141 };
 142
 143
 144 /** defines one command of para_audiod */
 145 struct audiod_command {
 146         /** the name of the command */
 147         const char *name;
 148         /** pointer to the function that handles the command */
 149         int (*handler)(int, int, char**);
 150         int (*line_handler)(int, char*);
 151         /** one-line description of the command */
 152         const char *description;
 153         /** summary of the command line options */
 154         const char *synopsis;
 155         /** the long help text */
 156         const char *help;
 157 };
 158 static int com_grab(int, char *);
 159 static int com_cycle(int, int, char **);
 160 static int com_help(int, int, char **);
 161 static int com_off(int, int, char **);
 162 static int com_on(int, int, char **);
 163 static int com_sb(int, int, char **);
 164 static int com_stat(int, int, char **);
 165 static int com_term(int, int, char **);
 166 static struct audiod_command cmds[] = {
 167 {
 168 .name = "cycle",
 169 .handler = com_cycle,
 170 .description = "switch to next mode",
 171 .synopsis = "cycle",
 172 .help =
 173
 174 "on -> standby -> off -> on\n"
 175
 176 },
 177 {
 178 .name = "grab",
 179 .line_handler = com_grab,
 180 .description = "grab the audio stream",
 181 .synopsis = "-- grab [grab_options]",
 182 .help =
 183
 184 "grab ('splice') the audio stream at any position in the filter      \n"
 185 "chain and send that data back to the client. Try\n"
 186 "\t para_audioc -- grab -h\n"
 187 "for the list of available options.\n"
 188 },
 189
 190 {
 191 .name = "help",
 192 .handler = com_help,
 193 .description = "display command list or help for given command",
 194 .synopsis = "help [command]",
 195 .help =
 196
 197 "When I was younger, so much younger than today, I never needed\n"
 198 "anybody's help in any way. But now these days are gone, I'm not so\n"
 199 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 200 "\n"
 201 "                               -- Beatles: Help\n"
 202
 203 },
 204 {
 205 .name = "off",
 206 .handler = com_off,
 207 .description = "deactivate para_audiod",
 208 .synopsis = "off",
 209 .help =
 210
 211 "Close connection to para_server and stop all decoders.\n"
 212
 213 },
 214 {
 215 .name = "on",
 216 .handler = com_on,
 217 .description = "activate para_audiod",
 218 .synopsis = "on",
 219 .help =
 220
 221 "Establish connection to para_server, retrieve para_server's current\n"
 222 "status. If playing, start corresponding decoder. Otherwise stop\n"
 223 "all decoders.\n"
 224
 225 },
 226 {
 227 .name = "sb",
 228 .handler = com_sb,
 229 .description = "enter standby mode",
 230 .synopsis = "sb",
 231 .help =
 232
 233 "Stop all decoders but leave connection to para_server open.\n"
 234
 235 },
 236 {
 237 .name = "stat",
 238 .handler = com_stat,
 239 .description = "print status information",
 240 .synopsis = "stat [item1 ...]",
 241 .help =
 242
 243 "Dump given status items (all if none given) to stdout.\n"
 244
 245 },
 246 {
 247 .name = "term",
 248 .handler = com_term,
 249 .description = "terminate audiod",
 250 .synopsis = "term",
 251 .help =
 252
 253 "Stop all decoders, shut down connection to para_server and exit.\n"
 254
 255 },
 256 {
 257 .name = NULL,
 258 }
 259 };
 260
 261 /** iterate over all slots */
 262 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 263 /** iterate over all supported audio formats */
 264 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 265 /** iterate over the array of all audiod commands */
 266 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 267
 268 /**
 269  * get the audio format number
 270  * \param name the name of the audio format
 271  *
 272  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 273  * \a name is not a supported audio format.
 274  */
 275 int get_audio_format_num(char *name)
 276 {
 277         int i;
 278         FOR_EACH_AUDIO_FORMAT(i)
 279                 if (!strcmp(name, audio_formats[i]))
 280                         return i;
 281         return -E_UNSUPPORTED_AUDIO_FORMAT;
 282 }
 283
 284 /*
 285  * log function. first argument is loglevel.
 286  */
 287 void para_log(int ll, const char* fmt,...)
 288 {
 289         va_list argp;
 290         FILE *outfd;
 291         struct tm *tm;
 292         time_t t1;
 293         char str[MAXLINE] = "";
 294
 295         if (ll < conf.loglevel_arg)
 296                 return;
 297         outfd = logfile? logfile : stderr;
 298         time(&t1);
 299         tm = localtime(&t1);
 300         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 301         fprintf(outfd, "%s %s ", str, hostname);
 302         if (conf.loglevel_arg <= INFO)
 303                 fprintf(outfd, "%i ", ll);
 304         va_start(argp, fmt);
 305         vfprintf(outfd, fmt, argp);
 306         va_end(argp);
 307 }
 308
 309 static int client_write(int fd, const char *buf)
 310 {
 311         size_t len = strlen(buf);
 312         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 313 }
 314
 315 static char *get_time_string(struct timeval *newest_stime)
 316 {
 317         struct timeval now, diff, adj_stream_start, tmp;
 318         int total = 0, use_server_time = 1;
 319
 320         if (!playing) {
 321                 if (length_seconds)
 322                         return NULL;
 323                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 324         }
 325         if (audiod_status == AUDIOD_OFF)
 326                 goto out;
 327         if (sa_time_diff_sign > 0)
 328                 tv_diff(&server_stream_start, &sa_time_diff,
 329                         &adj_stream_start);
 330         else
 331                 tv_add(&server_stream_start, &sa_time_diff,
 332                         &adj_stream_start);
 333         tmp = adj_stream_start;
 334         if (newest_stime && audiod_status == AUDIOD_ON) {
 335                 tv_diff(newest_stime, &adj_stream_start, &diff);
 336                 if (tv2ms(&diff) < 5000) {
 337                         tmp = *newest_stime;
 338                         use_server_time = 0;
 339                 }
 340         }
 341         gettimeofday(&now, NULL);
 342         tv_diff(&now, &tmp, &diff);
 343         total = diff.tv_sec + offset_seconds;
 344         if (total > length_seconds)
 345                 total = length_seconds;
 346         if (total < 0)
 347                 total = 0;
 348 out:
 349         return make_message(
 350                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 351                 status_item_list[SI_PLAY_TIME],
 352                 use_server_time? "~" : "",
 353                 total / 60,
 354                 total % 60,
 355                 (length_seconds - total) / 60,
 356                 (length_seconds - total) % 60,
 357                 length_seconds? (total * 100 + length_seconds / 2) /
 358                         length_seconds : 0,
 359                 length_seconds / 60,
 360                 length_seconds % 60
 361         );
 362 }
 363
 364 __malloc static char *audiod_status_string(void)
 365 {
 366         const char *status = (audiod_status == AUDIOD_ON)?
 367                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 368         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 369 }
 370
 371 static struct timeval *wstime(void)
 372 {
 373         int i;
 374         struct timeval *max = NULL;
 375         FOR_EACH_SLOT(i) {
 376                 struct slot_info *s = &slot[i];
 377                 if (s->wpid <= 0)
 378                         continue;
 379                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 380                         continue;
 381                 max = &s->wstime;
 382         }
 383         return max;
 384 }
 385 __malloc static char *decoder_flags(void)
 386 {
 387         int i;
 388         char decoder_flags[MAX_STREAM_SLOTS + 1];
 389
 390         FOR_EACH_SLOT(i) {
 391                 struct slot_info *s = &slot[i];
 392                 char flag = '0';
 393                 if (s->receiver_node)
 394                         flag += 1;
 395                 if (s->wpid > 0)
 396                         flag += 2;
 397                 decoder_flags[i] = flag;
 398         }
 399         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 400         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 401                 decoder_flags);
 402 }
 403
 404 static char *configfile_exists(void)
 405 {
 406         static char *config_file;
 407
 408         if (!config_file) {
 409                 char *home = para_homedir();
 410                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 411                 free(home);
 412         }
 413         return file_exists(config_file)? config_file : NULL;
 414 }
 415
 416 static void setup_signal_handling(void)
 417 {
 418         sig_task->fd = para_signal_init();
 419         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 420         para_install_sighandler(SIGINT);
 421         para_install_sighandler(SIGTERM);
 422         para_install_sighandler(SIGCHLD);
 423         para_install_sighandler(SIGHUP);
 424         signal(SIGPIPE, SIG_IGN);
 425 }
 426
 427 static void audiod_status_dump(void)
 428 {
 429         static char *p_ts, *p_us, *p_as, *p_df;
 430         struct timeval *t = wstime();
 431         char *us, *tmp = get_time_string(t);
 432
 433         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 434                 stat_client_write(tmp, SI_PLAY_TIME);
 435         free(p_ts);
 436         p_ts = tmp;
 437
 438         us = uptime_str();
 439         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 440         free(us);
 441         if (!p_us || strcmp(p_us, tmp))
 442                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 443         free(p_us);
 444         p_us = tmp;
 445
 446         tmp = audiod_status_string();
 447         if (!p_as || strcmp(p_as, tmp))
 448                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 449         free(p_as);
 450         p_as = tmp;
 451
 452         tmp = decoder_flags();
 453         if (!p_df || strcmp(p_df, tmp))
 454                 stat_client_write(tmp, SI_DECODER_FLAGS);
 455         free(p_df);
 456         p_df = tmp;
 457 }
 458
 459 static void clear_slot(int slot_num)
 460 {
 461         struct slot_info *s = &slot[slot_num];
 462
 463         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 464         memset(s, 0, sizeof(struct slot_info));
 465         s->format = -1;
 466 }
 467
 468 static void kill_stream_writer(int slot_num)
 469 {
 470         struct slot_info *s = &slot[slot_num];
 471
 472         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 473                 return;
 474         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 475                 s->wpid, audio_formats[s->format], slot_num);
 476         kill(s->wpid, SIGTERM);
 477         s->wkilled = 1;
 478 }
 479
 480 static void set_restart_barrier(int format, struct timeval *now)
 481 {
 482         struct timeval tmp;
 483
 484         if (now)
 485                 tmp = *now;
 486         else
 487                 gettimeofday(&tmp, NULL);
 488         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 489 }
 490
 491 static void close_receiver(int slot_num)
 492 {
 493         struct slot_info *s = &slot[slot_num];
 494         struct audio_format_info *a;
 495
 496         if (s->format < 0 || !s->receiver_node)
 497                 return;
 498         a = &afi[s->format];
 499         PARA_NOTICE_LOG("closing %s recevier in slot %d (eof = %d)\n",
 500                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 501         if (!s->receiver_node->eof)
 502                 unregister_task(&s->receiver_node->task);
 503         a->receiver->close(s->receiver_node);
 504         free(s->receiver_node);
 505         s->receiver_node = NULL;
 506         set_restart_barrier(s->format, NULL);
 507 }
 508
 509 static void kill_all_decoders(void)
 510 {
 511         int i;
 512
 513         FOR_EACH_SLOT(i)
 514                 if (slot[i].format >= 0) {
 515                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 516                         kill_stream_writer(i);
 517                 }
 518 }
 519
 520 static void check_sigchld(void)
 521 {
 522         pid_t pid;
 523         int i;
 524         struct timeval now;
 525         gettimeofday(&now, NULL);
 526
 527 reap_next_child:
 528         pid = para_reap_child();
 529         if (pid <= 0)
 530                 return;
 531         FOR_EACH_SLOT(i) {
 532                 struct slot_info *s = &slot[i];
 533                 long lifetime;
 534                 if (s->format < 0)
 535                         continue;
 536                 if (pid == s->wpid) {
 537                         s->wpid = -1;
 538                         lifetime = now.tv_sec - s->wstime.tv_sec;
 539                         PARA_INFO_LOG("%s stream writer in slot %d died "
 540                                 "after %li secs\n",
 541                                 audio_formats[s->format], i, lifetime);
 542                         set_restart_barrier(s->format, &now);
 543                         goto reap_next_child;
 544                 }
 545         }
 546         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 547         goto reap_next_child;
 548 }
 549
 550 static int get_empty_slot(void)
 551 {
 552         int i;
 553         struct slot_info *s;
 554
 555         FOR_EACH_SLOT(i) {
 556                 s = &slot[i];
 557                 if (s->format < 0) {
 558                         clear_slot(i);
 559                         return i;
 560                 }
 561                 if (s->write_fd > 0 || s->wpid > 0)
 562                         continue;
 563                 if (s->receiver_node)
 564                         continue;
 565                 if (s->fc)
 566                         continue;
 567                 clear_slot(i);
 568                 return i;
 569         }
 570         return -E_NO_MORE_SLOTS;
 571 }
 572
 573 static int decoder_running(int format)
 574 {
 575         int i, ret = 0;
 576         struct slot_info *s;
 577
 578         FOR_EACH_SLOT(i) {
 579                 s = &slot[i];
 580                 if (s->format == format && s->receiver_node)
 581                         ret |= 1;
 582                 if (s->format == format && s->wpid > 0)
 583                         ret |= 2;
 584         }
 585         return ret;
 586 }
 587
 588 static void close_stat_pipe(void)
 589 {
 590         int i;
 591
 592         if (stat_task->fd < 0)
 593                 return;
 594         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 595         close(stat_task->fd);
 596         del_close_on_fork_list(stat_task->fd);
 597         stat_task->fd = -1;
 598         kill_all_decoders();
 599         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 600                 free(stat_item_values[i]);
 601                 stat_item_values[i] = NULL;
 602         }
 603         dump_empty_status();
 604         length_seconds = 0;
 605         offset_seconds = 0;
 606         audiod_status_dump();
 607         playing = 0;
 608         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 609                 status_item_list[SI_STATUS_BAR]);
 610         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 611 }
 612
 613 static void __noreturn clean_exit(int status, const char *msg)
 614 {
 615         PARA_EMERG_LOG("%s\n", msg);
 616         kill_all_decoders();
 617         if (socket_name)
 618                 unlink(socket_name);
 619         if (stat_task->fd >= 0)
 620                 close_stat_pipe();
 621         exit(status);
 622 }
 623
 624 __malloc static char *glob_cmd(char *cmd)
 625 {
 626         char *ret, *replacement;
 627         struct timeval tmp, delay, rss; /* real stream start */
 628
 629         delay.tv_sec = conf.stream_delay_arg / 1000;
 630         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 631 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 632         if (sa_time_diff_sign < 0)
 633                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 634         else
 635                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 636         tv_add(&rss, &delay, &tmp);
 637         replacement = make_message("%lu:%lu",
 638                 (long unsigned)tmp.tv_sec,
 639                 (long unsigned)tmp.tv_usec);
 640         ret = s_a_r(cmd, "STREAM_START", replacement);
 641         free(replacement);
 642         if (!ret)
 643                 goto out;
 644         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 645 out:
 646         return ret;
 647 }
 648
 649 /** get the number of filters for the given audio format */
 650 int num_filters(int audio_format_num)
 651 {
 652         return afi[audio_format_num].num_filters;
 653 }
 654
 655 void filter_event_handler(struct task *t)
 656 {
 657         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 658         unregister_task(t);
 659 }
 660
 661 static void open_filters(int slot_num)
 662 {
 663         struct slot_info *s = &slot[slot_num];
 664         struct audio_format_info *a = &afi[s->format];
 665         int nf = a->num_filters;
 666         int i;
 667         static int output_eof; /* FIXME */
 668
 669         s->fc = para_calloc(sizeof(struct filter_chain));
 670         INIT_LIST_HEAD(&s->fc->filters);
 671         if (!nf)
 672                 return;
 673         s->fc->inbuf = s->receiver_node->buf;
 674         s->fc->in_loaded = &s->receiver_node->loaded;
 675         s->fc->input_eof = &s->receiver_node->eof;
 676         s->fc->output_eof = &output_eof;
 677         output_eof = 0;
 678
 679         s->fc->task.pre_select = filter_pre_select;
 680         s->fc->task.event_handler = filter_event_handler;
 681         s->fc->task.private_data = s->fc;
 682         s->fc->task.flags = 0;
 683         s->fc->eof = 0;
 684         sprintf(s->fc->task.status, "filter chain");
 685         for (i = 0; i < nf; i++) {
 686                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 687                 fn->conf = a->filter_conf[i];
 688                 fn->fc = s->fc;
 689                 fn->filter = a->filters[i];
 690                 INIT_LIST_HEAD(&fn->callbacks);
 691                 list_add_tail(&fn->node, &s->fc->filters);
 692                 fn->filter->open(fn);
 693                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 694                         audio_formats[s->format], i + 1,  nf,
 695                         fn->filter->name, slot_num);
 696                 s->fc->outbuf = fn->buf;
 697                 s->fc->out_loaded = &fn->loaded;
 698         }
 699         register_task(&s->fc->task);
 700 //      PARA_DEBUG_LOG("output loaded for filter chain %p: %p\n", s->fc,
 701 //              s->fc->out_loaded);
 702 }
 703
 704 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 705 {
 706         struct filter_node *fn;
 707         int i, j;
 708
 709         FOR_EACH_SLOT(i) {
 710                 struct slot_info *s = &slot[i];
 711                 if (s->format < 0 || !s->fc)
 712                         continue;
 713                 if (slot_num >= 0 && slot_num != i)
 714                         continue;
 715                 if (format >= 0 && s->format != format)
 716                         continue;
 717                 if (num_filters(i) < filternum)
 718                         continue;
 719                 /* success */
 720                 j = 1;
 721                 list_for_each_entry(fn, &s->fc->filters, node)
 722                         if (filternum <= 0 || j++ == filternum)
 723                                 break;
 724                 return fn;
 725         }
 726         return NULL;
 727 }
 728
 729 static void start_stream_writer(int slot_num)
 730 {
 731         int ret, fds[3] = {1, -1, -1};
 732         struct slot_info *s = &slot[slot_num];
 733         struct audio_format_info *a = &afi[s->format];
 734         char *glob = NULL;
 735
 736         if (a->write_cmd)
 737                 glob = glob_cmd(a->write_cmd);
 738         if (!glob)
 739                 glob = para_strdup("para_write -w alsa");
 740         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 741         open_filters(slot_num);
 742         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 743         free(glob);
 744         if (ret < 0) {
 745                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 746                 return;
 747         }
 748         s->write_fd = fds[0];
 749         add_close_on_fork_list(s->write_fd);
 750         /* we write to this fd in do_select, so we need non-blocking */
 751         mark_fd_nonblock(s->write_fd);
 752         gettimeofday(&s->wstime, NULL);
 753         current_decoder = slot_num;
 754         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 755 }
 756
 757 void rn_event_handler(struct task *t)
 758 {
 759 //      struct receiver_node *rn = t->private_data;
 760         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 761         unregister_task(t);
 762 }
 763 static void open_receiver(int format)
 764 {
 765         struct audio_format_info *a = &afi[format];
 766         struct slot_info *s;
 767         int ret, slot_num;
 768         struct receiver_node *rn;
 769
 770         slot_num = get_empty_slot();
 771         if (slot_num < 0)
 772                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 773         s = &slot[slot_num];
 774         s->format = format;
 775         gettimeofday(&s->rtime, NULL);
 776         s->wtime = s->rtime;
 777         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 778         rn = s->receiver_node;
 779         rn->receiver = a->receiver;
 780         rn->conf = a->receiver_conf;
 781         ret = a->receiver->open(s->receiver_node);
 782         if (ret < 0) {
 783                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 784                         PARA_STRERROR(-ret));
 785                 free(s->receiver_node);
 786                 s->receiver_node = NULL;
 787                 return;
 788         }
 789         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 790                 audio_formats[s->format], a->receiver->name, slot_num);
 791         rn->task.private_data = s->receiver_node;
 792         PARA_NOTICE_LOG("rn = %p\n", rn->task.private_data);
 793         rn->task.pre_select = a->receiver->pre_select;
 794         rn->task.post_select = a->receiver->post_select;
 795         rn->task.event_handler = rn_event_handler;
 796         rn->task.flags = 0;
 797         sprintf(rn->task.status, "receiver node");
 798         register_task(&rn->task);
 799 }
 800
 801 static int is_frozen(int format)
 802 {
 803         struct timeval now;
 804         struct audio_format_info *a = &afi[format];
 805
 806         gettimeofday(&now, NULL);
 807         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 808 }
 809
 810 static void start_current_receiver(void)
 811 {
 812         int i;
 813
 814         if (!af_status)
 815                 return;
 816         i = get_audio_format_num(af_status);
 817         if (i < 0)
 818                 return;
 819         if ((decoder_running(i) & 1) || is_frozen(i))
 820                 return;
 821         open_receiver(i);
 822 }
 823
 824 static void compute_time_diff(const struct timeval *status_time)
 825 {
 826         struct timeval now, tmp, diff;
 827         static int count;
 828         int sign;
 829         const struct timeval max_deviation = {0, 500 * 1000};
 830         const int time_smooth = 5;
 831
 832         gettimeofday(&now, NULL);
 833         sign = tv_diff(status_time, &now, &diff);
 834 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 835 //                      sign, sa_time_diff_sign);
 836         if (!count) {
 837                 sa_time_diff_sign = sign;
 838                 sa_time_diff = diff;
 839                 count++;
 840                 return;
 841         }
 842         if (count > 5) {
 843                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 844                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 845                         PARA_WARNING_LOG("time diff jump: %lims\n",
 846                                 s * tv2ms(&tmp));
 847         }
 848         count++;
 849         sa_time_diff_sign = tv_convex_combination(
 850                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 851                 count > 10? sign : sign * time_smooth, &diff,
 852                 &tmp);
 853         sa_time_diff = tmp;
 854         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 855                 sign > 0? "+" : "-",
 856                 tv2ms(&diff),
 857                 sa_time_diff_sign ? "+" : "-",
 858                 tv2ms(&sa_time_diff)
 859         );
 860 }
 861
 862 static void check_stat_line(char *line)
 863 {
 864         int itemnum;
 865         size_t ilen = 0;
 866         long unsigned sec, usec;
 867         char *tmp;
 868
 869 //      PARA_INFO_LOG("line: %s\n", line);
 870         if (!line)
 871                 return;
 872         itemnum = stat_line_valid(line);
 873         if (itemnum < 0) {
 874                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 875                 return;
 876         }
 877         tmp = make_message("%s\n", line);
 878         stat_client_write(tmp, itemnum);
 879         free(tmp);
 880         free(stat_item_values[itemnum]);
 881         stat_item_values[itemnum] = para_strdup(line);
 882         ilen = strlen(status_item_list[itemnum]);
 883         switch (itemnum) {
 884         case SI_STATUS:
 885                 playing = strstr(line, "playing")? 1 : 0;
 886                 break;
 887         case SI_FORMAT:
 888                 free(af_status);
 889                 af_status = para_strdup(line + ilen + 1);
 890                 break;
 891         case SI_OFFSET:
 892                 offset_seconds = atoi(line + ilen + 1);
 893                 break;
 894         case SI_LENGTH:
 895                 length_seconds = atoi(line + ilen + 1);
 896                 break;
 897         case SI_STREAM_START:
 898                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 899                         server_stream_start.tv_sec = sec;
 900                         server_stream_start.tv_usec = usec;
 901                 }
 902                 break;
 903         case SI_CURRENT_TIME:
 904                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 905                         struct timeval tv = {sec, usec};
 906                         compute_time_diff(&tv);
 907                 }
 908                 break;
 909         }
 910 }
 911
 912 static void handle_signal(int sig)
 913 {
 914         switch (sig) {
 915         case SIGCHLD:
 916                 return check_sigchld();
 917         case SIGINT:
 918         case SIGTERM:
 919         case SIGHUP:
 920                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 921                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 922                 return;
 923         }
 924 }
 925
 926 static void check_timeouts(void)
 927 {
 928         struct timeval now;
 929         int slot_num, timeout = conf.stream_timeout_arg;
 930
 931         gettimeofday(&now, NULL);
 932         FOR_EACH_SLOT(slot_num) {
 933                 struct slot_info *s = &slot[slot_num];
 934                 if (s->format < 0)
 935                         continue;
 936                 /* check read time */
 937                 if (s->receiver_node &&
 938                         now.tv_sec > s->rtime.tv_sec + timeout) {
 939                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 940                                 audio_formats[s->format], slot_num);
 941                         s->receiver_node->eof = 1;
 942                 }
 943                 /* check write time */
 944                 if (s->wpid > 0 && !s->wkilled &&
 945                         now.tv_sec > s->wtime.tv_sec + timeout) {
 946                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 947                                 audio_formats[s->format], slot_num);
 948                         kill_stream_writer(slot_num);
 949                 }
 950         }
 951 }
 952
 953 static size_t get_loaded_bytes(int slot_num)
 954 {
 955         size_t loaded = 0;
 956         struct slot_info *s = &slot[slot_num];
 957         struct receiver_node *rn = s->receiver_node;
 958
 959         if (s->format < 0)
 960                 goto out;
 961
 962         if (afi[s->format].num_filters) {
 963                 if (s->fc)
 964                         loaded = *s->fc->out_loaded;
 965         } else {
 966                 if (rn)
 967                         loaded = rn->loaded;
 968         }
 969 out:
 970         return loaded;
 971 }
 972
 973 static void close_writer(int slot_num)
 974 {
 975         struct slot_info *s = &slot[slot_num];
 976         if (s->write_fd > 0) {
 977                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 978                         s->write_fd);
 979                 close(s->write_fd);
 980                 del_close_on_fork_list(s->write_fd);
 981                 s->write_fd = -1;
 982         }
 983         if (s->fc)
 984                 *s->fc->output_eof = 1; /* FIXME */
 985 }
 986
 987
 988 static void close_decoder_if_idle(int slot_num)
 989 {
 990         struct slot_info *s = &slot[slot_num];
 991         struct receiver_node *rn = s->receiver_node;
 992
 993         if (s->format < 0)
 994                 return;
 995         if (!s->fc)
 996                 return;
 997         if (!rn->eof && !s->fc->eof && s->wpid > 0)
 998                 return;
 999         if (!s->fc->eof && s->wpid > 0 && get_loaded_bytes(slot_num))
1000                 return;
1001         close_writer(slot_num);
1002         if (s->wpid > 0)
1003                 return; /* wait until writer dies before closing filters */
1004         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
1005                 slot_num, s->fc);
1006         close_filters(s->fc);
1007         free(s->fc);
1008         close_receiver(slot_num);
1009         clear_slot(slot_num);
1010 }
1011
1012 static void audiod_pre_select(struct sched *s, struct task *t)
1013 {
1014         int i;
1015
1016         if (audiod_status != AUDIOD_ON)
1017                 kill_all_decoders();
1018         else if (playing)
1019                 start_current_receiver();
1020         check_timeouts();
1021         FOR_EACH_SLOT(i) {
1022                 struct audio_format_info *a;
1023                 struct receiver_node *rn;
1024
1025                 close_decoder_if_idle(i);
1026                 slot[i].wcheck = 0;
1027                 if (slot[i].format < 0)
1028                         continue;
1029                 a = &afi[slot[i].format];
1030                 rn = slot[i].receiver_node;
1031                 if (rn && rn->loaded && !slot[i].wpid) {
1032                         PARA_INFO_LOG("no writer in slot %d\n", i);
1033                         start_stream_writer(i);
1034                 }
1035                 if (slot[i].write_fd <= 0)
1036                         continue;
1037                 if (!get_loaded_bytes(i))
1038                         continue;
1039                 para_fd_set(slot[i].write_fd, &s->wfds, &s->max_fileno);
1040                 slot[i].wcheck = 1;
1041         }
1042 }
1043
1044 static int write_audio_data(int slot_num)
1045 {
1046         struct slot_info *s = &slot[slot_num];
1047         struct audio_format_info *a = &afi[s->format];
1048         struct receiver_node *rn = s->receiver_node;
1049         int ret;
1050         char **buf;
1051         size_t *len;
1052
1053         if (a->num_filters) {
1054                 buf = &s->fc->outbuf;
1055                 len = s->fc->out_loaded;
1056         } else {
1057                 buf = &rn->buf;
1058                 len = &rn->loaded;
1059         }
1060         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1061         ret = write(s->write_fd, *buf, *len);
1062         PARA_DEBUG_LOG("wrote %d/%zd\n", ret, *len);
1063         if (ret < 0) {
1064                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1065                         slot_num, s->write_fd, strerror(errno));
1066                 *len = 0;
1067                 close_writer(slot_num);
1068 //              s->fc->error = E_WRITE_AUDIO_DATA;
1069         } else if (ret != *len) {
1070                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1071                         audio_formats[s->format], ret, *len, slot_num);
1072                 *len -= ret;
1073                 memmove(*buf, *buf + ret, *len);
1074         } else
1075                 *len = 0;
1076         if (ret > 0)
1077                 gettimeofday(&s->wtime, NULL);
1078         return ret;
1079 }
1080
1081 static void audiod_post_select(struct sched *s, struct task *t)
1082 {
1083         int ret, i;
1084
1085         FOR_EACH_SLOT(i) {
1086                 struct receiver_node *rn = slot[i].receiver_node;
1087
1088                 if (rn && rn->loaded)
1089                         slot[i].rtime = s->now;
1090                 if (slot[i].write_fd <= 0 || !slot[i].wcheck
1091                         || !FD_ISSET(slot[i].write_fd, &s->wfds))
1092                         continue;
1093                 ret = write_audio_data(i);
1094         }
1095 }
1096
1097 static void init_audiod_task(struct audiod_task *at)
1098 {
1099         at->task.pre_select = audiod_pre_select;
1100         at->task.post_select = audiod_post_select;
1101         at->task.private_data = at;
1102         at->task.flags = 0;
1103         sprintf(at->task.status, "audiod task");
1104 }
1105
1106 static int parse_stream_command(const char *txt, char **cmd)
1107 {
1108         char *p = strchr(txt, ':');
1109         int i;
1110
1111         if (!p)
1112                 return -E_MISSING_COLON;
1113         p++;
1114         FOR_EACH_AUDIO_FORMAT(i) {
1115                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1116                         continue;
1117                 *cmd = p;
1118                 return i;
1119         }
1120         return -E_UNSUPPORTED_AUDIO_FORMAT;
1121 }
1122
1123 static int add_filter(int format, char *cmdline)
1124 {
1125         struct audio_format_info *a = &afi[format];
1126         int filter_num, nf = a->num_filters;
1127
1128         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1129         if (filter_num < 0)
1130                 return filter_num;
1131         a->filters[nf] = &filters[filter_num];
1132         a->num_filters++;
1133         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1134                 a->filters[nf]->name);
1135         return filter_num;
1136 }
1137
1138 static int setup_default_filters(void)
1139 {
1140         int i, ret = 1;
1141
1142         FOR_EACH_AUDIO_FORMAT(i) {
1143                 struct audio_format_info *a = &afi[i];
1144                 char *tmp;
1145                 int j;
1146                 if (a->num_filters)
1147                         continue;
1148                 /* add "dec" to audio format name */
1149                 tmp = make_message("%sdec", audio_formats[i]);
1150                 for (j = 0; filters[j].name; j++)
1151                         if (!strcmp(tmp, filters[j].name))
1152                                 break;
1153                 free(tmp);
1154                 ret = -E_UNSUPPORTED_FILTER;
1155                 if (!filters[j].name)
1156                         goto out;
1157                 tmp = para_strdup(filters[j].name);
1158                 ret = add_filter(i, tmp);
1159                 free(tmp);
1160                 if (ret < 0)
1161                         goto out;
1162                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1163                         filters[j].name);
1164                 ret = add_filter(i, "wav");
1165                 if (ret < 0)
1166                         goto out;
1167                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1168         }
1169 out:
1170         return ret;
1171 }
1172
1173 static int init_stream_io(void)
1174 {
1175         int i, ret, receiver_num, nf;
1176         char *cmd;
1177
1178         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1179                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1180                 if (ret < 0)
1181                         goto out;
1182                 afi[ret].write_cmd = para_strdup(cmd);
1183                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1184         }
1185         for (i = 0; receivers[i].name; i++) {
1186                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1187                 receivers[i].init(&receivers[i]);
1188         }
1189         for (i = 0; i < conf.receiver_given; i++) {
1190                 char *arg = conf.receiver_arg[i];
1191                 char *recv = strchr(arg, ':');
1192                 ret = -E_MISSING_COLON;
1193                 if (!recv)
1194                         goto out;
1195                 *recv = '\0';
1196                 recv++;
1197                 ret = get_audio_format_num(arg);
1198                 if (ret < 0)
1199                         goto out;
1200                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1201                 if (!afi[ret].receiver_conf) {
1202                         ret = -E_RECV_SYNTAX;
1203                         goto out;
1204                 }
1205                 afi[ret].receiver = &receivers[receiver_num];
1206         }
1207         /* use the first available receiver with no arguments
1208          * for those audio formats for which no receiver
1209          * was specified
1210          */
1211         cmd = para_strdup(receivers[0].name);
1212         FOR_EACH_AUDIO_FORMAT(i) {
1213                 struct audio_format_info *a = &afi[i];
1214                 if (a->receiver_conf)
1215                         continue;
1216                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1217                 if (!a->receiver_conf)
1218                         return -E_RECV_SYNTAX;
1219                 a->receiver = &receivers[receiver_num];
1220         }
1221         free(cmd);
1222         /* filters */
1223         filter_init(filters);
1224         nf = PARA_MAX(2,  conf.filter_given) + 1;
1225         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1226         FOR_EACH_AUDIO_FORMAT(i) {
1227                 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1228                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1229         }
1230         if (!conf.no_default_filters_given)
1231                 return setup_default_filters();
1232         for (i = 0; i < conf.filter_given; i++) {
1233                 char *arg = conf.filter_arg[i];
1234                 char *filter_name = strchr(arg, ':');
1235                 ret = -E_MISSING_COLON;
1236                 if (!filter_name)
1237                         goto out;
1238                 *filter_name = '\0';
1239                 filter_name++;
1240                 ret = get_audio_format_num(arg);
1241                 if (ret < 0)
1242                         goto out;
1243                 ret = add_filter(ret, filter_name);
1244                 if (ret < 0)
1245                         goto out;
1246         }
1247         ret = 1;
1248 out:
1249         return ret;
1250 }
1251
1252 static int dump_commands(int fd)
1253 {
1254         char *buf = para_strdup(""), *tmp = NULL;
1255         int i;
1256         ssize_t ret;
1257
1258         FOR_EACH_COMMAND(i) {
1259                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1260                         cmds[i].description);
1261                 free(buf);
1262                 buf = tmp;
1263         }
1264         ret = client_write(fd, buf);
1265         free(buf);
1266         return ret;
1267 }
1268
1269 /*
1270  * command handlers don't close their fd on errors (ret < 0) so that
1271  * its caller can send an error message. Otherwise (ret >= 0) it's up
1272  * to each individual command to close the fd if necessary.
1273  */
1274
1275 static int com_help(int fd, int argc, char **argv)
1276 {
1277         int i, ret;
1278         char *buf;
1279         const char *dflt = "No such command. Available commands:\n";
1280
1281         if (argc < 2) {
1282                 ret = dump_commands(fd);
1283                 goto out;
1284         }
1285         FOR_EACH_COMMAND(i) {
1286                 if (strcmp(cmds[i].name, argv[1]))
1287                         continue;
1288                 buf = make_message(
1289                         "NAME\n\t%s -- %s\n"
1290                         "SYNOPSIS\n\tpara_audioc %s\n"
1291                         "DESCRIPTION\n%s\n",
1292                         argv[1],
1293                         cmds[i].description,
1294                         cmds[i].synopsis,
1295                         cmds[i].help
1296                 );
1297                 ret = client_write(fd, buf);
1298                 free(buf);
1299                 goto out;
1300         }
1301         ret = client_write(fd, dflt);
1302         if (ret > 0)
1303                 ret = dump_commands(fd);
1304 out:
1305         if (ret >= 0)
1306                 close(fd);
1307         return ret;
1308 }
1309
1310 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1311 {
1312         int i, ret;
1313         char *buf = NULL;
1314         long unsigned mask = ~0LU;
1315
1316         if (argc > 1) {
1317                 mask = 0;
1318                 for (i = 1; i < argc; i++) {
1319                         ret = stat_item_valid(argv[i]);
1320                         if (ret < 0)
1321                                 return ret;
1322                         mask |= (1 << ret);
1323                 }
1324         }
1325         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1326         if (mask & (1 << SI_PLAY_TIME)) {
1327                 struct timeval *t = wstime();
1328                 char *ts = get_time_string(t);
1329                 if (ts) {
1330                         ret = client_write(fd, ts);
1331                         if (ret < 0)
1332                                 goto out;
1333                         free(ts);
1334                 }
1335         }
1336         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1337                 char *tmp, *us = uptime_str();
1338                 tmp = make_message("%s:%s\n",
1339                         status_item_list[SI_AUDIOD_UPTIME], us);
1340                 free(us);
1341                 ret = client_write(fd, tmp);
1342                 if (ret < 0)
1343                         goto out;
1344                 free(tmp);
1345         }
1346         if (mask & (1 << SI_AUDIOD_STATUS)) {
1347                 char *s = audiod_status_string();
1348                 ret = client_write(fd, s);
1349                 if (ret < 0)
1350                         goto out;
1351                 free(s);
1352         }
1353         if (mask & (1 << SI_DECODER_FLAGS)) {
1354                 char *df =decoder_flags();
1355                 ret = client_write(fd, df);
1356                 if (ret < 0)
1357                         goto out;
1358                 free(df);
1359         }
1360
1361         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1362                 char *tmp, *v;
1363                 if (!((1 << i) & mask))
1364                         continue;
1365                 v = stat_item_values[i];
1366                 tmp = make_message("%s%s%s", buf? buf: "",
1367                         v? v : "", v? "\n" : "");
1368                 free(buf);
1369                 buf = tmp;
1370         }
1371         ret = client_write(fd, buf);
1372 out:
1373         if (ret > 0)
1374                 ret = stat_client_add(fd, mask);
1375         free(buf);
1376         return ret;
1377 }
1378
1379 #if 0
1380 static char *list_filters(void)
1381 {
1382         int i, j;
1383         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1384
1385         FOR_EACH_AUDIO_FORMAT(i) {
1386                 for (j = 0; j < afi[i].num_filters; j++) {
1387                         tmp = make_message("%s\t%i\t%s\n",
1388                                 afi[i].name, j, afi[i].filter_cmds[j]);
1389                         msg = para_strcat(msg, tmp);
1390                         free(tmp);
1391                 }
1392                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1393                         j, afi[i].write_cmd);
1394                 msg = para_strcat(msg, tmp);
1395                 free(tmp);
1396         }
1397         return msg;
1398 }
1399 #endif
1400
1401
1402 static int com_grab(int fd, char *cmdline)
1403 {
1404         struct grab_client *gc;
1405         struct filter_node *fn;
1406         int i, err;
1407         char *msg;
1408
1409         gc = grab_client_new(fd, cmdline, &err);
1410         if (!gc)
1411                 goto err_out;
1412         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1413         if (fn)
1414                 activate_grab_client(gc, fn);
1415         return 1;
1416 err_out:
1417         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1418                 return err;
1419         if (err == -E_GC_HELP_GIVEN) {
1420                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1421                 for (i = 0; grab_client_args_info_help[i]; i++) {
1422                         char *tmp = make_message("%s%s\n", msg,
1423                                 grab_client_args_info_help[i]);
1424                         free(msg);
1425                         msg = tmp;
1426                 }
1427         } else
1428                 msg = make_message("%s %s\n",
1429                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1430                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1431         err = client_write(fd, msg);
1432         free(msg);
1433         if (err < 0)
1434                 return err;
1435         close(fd);
1436         return 1;
1437 }
1438
1439 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1440 {
1441         close(fd);
1442         clean_exit(EXIT_SUCCESS, "terminating on user request");
1443 }
1444
1445 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1446 {
1447         audiod_status = AUDIOD_ON;
1448         close(fd);
1449         return 1;
1450 }
1451
1452 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1453 {
1454         audiod_status = AUDIOD_OFF;
1455         close(fd);
1456         return 1;
1457 }
1458
1459 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1460 {
1461         audiod_status = AUDIOD_STANDBY;
1462         close(fd);
1463         return 1;
1464 }
1465
1466 static int com_cycle(int fd, int argc, char **argv)
1467 {
1468         switch (audiod_status) {
1469                 case  AUDIOD_ON:
1470                         return com_sb(fd, argc, argv);
1471                         break;
1472                 case  AUDIOD_OFF:
1473                         return com_on(fd, argc, argv);
1474                         break;
1475                 case  AUDIOD_STANDBY:
1476                         return com_off(fd, argc, argv);
1477                         break;
1478         }
1479         close(fd);
1480         return 1;
1481 }
1482
1483 static int check_perms(uid_t uid)
1484 {
1485         int i;
1486
1487         if (!conf.user_allow_given)
1488                 return 1;
1489         for (i = 0; i < conf.user_allow_given; i++)
1490                 if (uid == conf.user_allow_arg[i])
1491                         return 1;
1492         return -E_UCRED_PERM;
1493 }
1494
1495 static int handle_connect(void)
1496 {
1497         int i, argc, ret, clifd = -1;
1498         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1499         struct sockaddr_un unix_addr;
1500
1501         ret = para_accept(cmd_task->fd, &unix_addr, sizeof(struct sockaddr_un));
1502         if (ret < 0)
1503                 goto out;
1504         clifd = ret;
1505         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1506         if (ret < 0)
1507                 goto out;
1508         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1509         ret = check_perms(ret);
1510         if (ret < 0)
1511                 goto out;
1512         ret = -E_INVALID_AUDIOD_CMD;
1513         cmd = para_strdup(buf);
1514         p = strchr(cmd, '\n');
1515         if (!p)
1516                 p = "";
1517         else {
1518                 *p = '\0';
1519                 p++;
1520         }
1521         for (i = 0; cmds[i].name; i++) {
1522                 int j;
1523                 if (strcmp(cmds[i].name, cmd))
1524                         continue;
1525                 if (cmds[i].handler) {
1526                         argc = split_args(buf, &argv, "\n");
1527                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1528                         ret = cmds[i].handler(clifd, argc, argv);
1529                         goto out;
1530                 }
1531                 for (j = 0; p[j]; j++)
1532                         if (p[j] == '\n')
1533                                 p[j] = ' ';
1534                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1535                 ret = cmds[i].line_handler(clifd, p);
1536                 goto out;
1537         }
1538         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1539 out:
1540         free(cmd);
1541         free(buf);
1542         free(argv);
1543         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1544                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1545                 client_write(clifd, tmp);
1546                 free(tmp);
1547                 close(clifd);
1548         }
1549         return ret;
1550 }
1551
1552 static void audiod_get_socket(void)
1553 {
1554         struct sockaddr_un unix_addr;
1555
1556         if (conf.socket_given)
1557                 socket_name = para_strdup(conf.socket_arg);
1558         else {
1559                 char *hn = para_hostname();
1560                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1561                         hn);
1562                 free(hn);
1563         }
1564         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1565         if (conf.force_given)
1566                 unlink(socket_name);
1567         cmd_task->fd = create_pf_socket(socket_name, &unix_addr,
1568                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1569         if (cmd_task->fd < 0) {
1570                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1571                 exit(EXIT_FAILURE); /* do not unlink socket */
1572         }
1573         if (listen(cmd_task->fd , 5) < 0) {
1574                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1575                 exit(EXIT_FAILURE); /* do not unlink socket */
1576         }
1577         add_close_on_fork_list(cmd_task->fd);
1578 }
1579
1580 static int open_stat_pipe(void)
1581 {
1582         int ret, fd[3] = {-1, 1, 0};
1583         pid_t pid;
1584         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1585         if (ret >= 0) {
1586                 ret = fd[1];
1587                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1588                 add_close_on_fork_list(ret);
1589         } else
1590                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1591         return ret;
1592 }
1593
1594 void signal_event_handler(struct task *t)
1595 {
1596         struct signal_task *st = t->private_data;
1597         handle_signal(st->signum);
1598 }
1599
1600 void signal_pre_select(struct sched *s, struct task *t)
1601 {
1602         struct signal_task *st = t->private_data;
1603         t->ret = 1;
1604         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1605 }
1606
1607 void signal_post_select(struct sched *s, struct task *t)
1608 {
1609         struct signal_task *st = t->private_data;
1610         t->ret = 1;
1611         if (!FD_ISSET(st->fd, &s->rfds))
1612                 return;
1613         t->ret = -E_SIGNAL_CAUGHT;
1614         st->signum = para_next_signal();
1615 }
1616
1617 void signal_setup_default(struct signal_task *st)
1618 {
1619         st->task.pre_select = signal_pre_select;
1620         st->task.post_select = signal_post_select;
1621         st->task.private_data = st;
1622         st->task.flags = 0;
1623         sprintf(st->task.status, "signal task");
1624 }
1625
1626 static void command_pre_select(struct sched *s, struct task *t)
1627 {
1628         struct command_task *ct = t->private_data;
1629         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1630
1631 }
1632
1633 static void command_post_select(struct sched *s, struct task *t)
1634 {
1635         int ret;
1636         struct command_task *ct = t->private_data;
1637
1638         if (audiod_status != AUDIOD_OFF)
1639                 audiod_status_dump();
1640         t->ret = 1; /* always successful */
1641         if (!FD_ISSET(ct->fd, &s->rfds))
1642                 return;
1643         ret = handle_connect();
1644         if (ret < 0)
1645                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1646 }
1647
1648 void init_command_task(struct command_task *ct)
1649 {
1650         ct->task.pre_select = command_pre_select;
1651         ct->task.post_select = command_post_select;
1652         ct->task.private_data = ct;
1653         ct->task.flags = 0;
1654         sprintf(ct->task.status, "command task");
1655 }
1656
1657 static void status_pre_select(struct sched *s, struct task *t)
1658 {
1659         struct status_task *st = t->private_data;
1660         t->ret = 1;
1661         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1662                 close_stat_pipe();
1663         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1664                 st->fd = open_stat_pipe();
1665                 st->loaded = 0;
1666                 st->buf[0] = '\0';
1667         }
1668         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1669                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1670 }
1671
1672 static void status_post_select(struct sched *s, struct task *t)
1673 {
1674         struct status_task *st = t->private_data;
1675         int ret;
1676
1677         t->ret = 1;
1678         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1679                 return;
1680         ret = read(st->fd, st->buf + st->loaded,
1681                 STRINGSIZE - 1 - st->loaded);
1682         if (ret <= 0) {
1683                 close_stat_pipe();
1684                 /* avoid busy loop if server is down */
1685                 while (sleep(1) > 0)
1686                         ; /* try again*/
1687         } else {
1688                 st->buf[ret + st->loaded] = '\0';
1689                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1690                         &check_stat_line);
1691         }
1692 }
1693
1694 static void init_status_task(struct status_task *st)
1695 {
1696         st->task.pre_select = status_pre_select;
1697         st->task.post_select = status_post_select;
1698         st->task.private_data = st;
1699         st->task.flags = 0;
1700         st->loaded = 0;
1701         st->fd = -1;
1702         st->buf[0] = '\0';
1703         sprintf(st->task.status, "status task");
1704 }
1705
1706
1707
1708 #if 0
1709 /* TODO: move everything before the select call to pre_select() */
1710 static void __noreturn audiod_mainloop(void)
1711 {
1712         fd_set rfds, wfds;
1713         int ret, max_fileno, sbo = 0;
1714         char status_buf[STRINGSIZE] = "";
1715         struct timeval tv;
1716
1717
1718
1719 repeat:
1720         FD_ZERO(&wfds);
1721         FD_ZERO(&rfds);
1722         max_fileno = -1;
1723         /* always check signal pipe and the local socket */
1724         para_fd_set(signal_pipe, &rfds, &max_fileno);
1725         para_fd_set(audiod_socket, &rfds, &max_fileno);
1726
1727         if (audiod_status != AUDIOD_ON)
1728                 kill_all_decoders();
1729         else if (playing)
1730                 start_current_receiver();
1731
1732         set_stream_fds(&wfds, &max_fileno);
1733         /* status pipe */
1734         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1735                 close_stat_pipe();
1736         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1737                 stat_pipe = open_stat_pipe();
1738                 sbo = 0;
1739                 status_buf[0] = '\0';
1740         }
1741         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1742                 para_fd_set(stat_pipe, &rfds, &max_fileno);
1743         /* local socket */
1744         tv.tv_sec = 0;
1745         tv.tv_usec = 200 * 1000;
1746         audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1747         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1748         if (ret < 0)
1749                 goto repeat;
1750         if (audiod_status != AUDIOD_OFF)
1751                 audiod_status_dump();
1752         audiod_post_select(ret, &rfds, &wfds);
1753         /* read status pipe */
1754         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1755                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1756                 if (ret <= 0) {
1757                         close_stat_pipe();
1758                         /* avoid busy loop if server is down */
1759                         while (sleep(1) > 0)
1760                                 ; /* try again*/
1761                 } else {
1762                         status_buf[ret + sbo] = '\0';
1763                         sbo = for_each_line(status_buf, ret + sbo,
1764                                 &check_stat_line);
1765                 }
1766         }
1767         slot_io(&wfds);
1768         if (FD_ISSET(audiod_socket, &rfds)) {
1769                 ret = handle_connect();
1770                 if (ret < 0) {
1771                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1772                 }
1773         }
1774         /* signals */
1775         if (FD_ISSET(signal_pipe, &rfds)) {
1776                 int sig_nr = para_next_signal();
1777                 if (sig_nr > 0)
1778                         handle_signal(sig_nr);
1779         }
1780         goto repeat;
1781 }
1782 #endif
1783
1784 static void set_initial_status(void)
1785 {
1786         audiod_status = AUDIOD_ON;
1787         if (!conf.mode_given)
1788                 return;
1789         if (!strcmp(conf.mode_arg, "sb")) {
1790                 audiod_status = AUDIOD_STANDBY;
1791                 return;
1792         }
1793         if (!strcmp(conf.mode_arg, "off")) {
1794                 audiod_status = AUDIOD_OFF;
1795                 return;
1796         }
1797         if (strcmp(conf.mode_arg, "on"))
1798                 PARA_WARNING_LOG("%s", "invalid mode\n");
1799 }
1800
1801 int main(int argc, char *argv[])
1802 {
1803         char *cf;
1804         int ret, i;
1805         struct sched s;
1806
1807         init_sched();
1808
1809         valid_fd_012();
1810         hostname = para_hostname();
1811         cmdline_parser(argc, argv, &conf);
1812         para_drop_privileges(conf.user_arg, conf.group_arg);
1813         cf = configfile_exists();
1814         if (cf) {
1815                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1816                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1817                         exit(EXIT_FAILURE);
1818                 }
1819         }
1820         if (conf.logfile_given)
1821                 logfile = open_log(conf.logfile_arg);
1822         log_welcome("para_audiod", conf.loglevel_arg);
1823         i = init_stream_io();
1824         if (i < 0) {
1825                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1826                 exit(EXIT_FAILURE);
1827         }
1828         server_uptime(UPTIME_SET);
1829         set_initial_status();
1830         FOR_EACH_SLOT(i)
1831                 clear_slot(i);
1832         init_grabbing();
1833         setup_signal_handling();
1834         if (conf.daemon_given)
1835                 daemon_init();
1836         audiod_get_socket(); /* doesn't return on errors */
1837
1838         signal_setup_default(sig_task);
1839         sig_task->task.event_handler = signal_event_handler;
1840
1841         init_status_task(stat_task);
1842         init_command_task(cmd_task);
1843         init_audiod_task(at);
1844
1845         register_task(&sig_task->task);
1846         register_task(&cmd_task->task);
1847         register_task(&stat_task->task);
1848         register_task(&at->task);
1849         s.default_timeout.tv_sec = 0;
1850         s.default_timeout.tv_usec = 999 * 1000;
1851         ret = sched(&s);
1852
1853         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1854         return EXIT_FAILURE;
1855 }