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 #include "write.h"
  40 #include "write_common.h"
  41
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 DEFINE_AUDIO_FORMAT_ARRAY;
  46
  47 /**
  48  * the possible modes of operation
  49  *
  50  * - off: disconnect from para_server
  51  * - on: receive status information from para_server and play the audio stream
  52  * - sb: only receive status information but not the audio stream
  53 */
  54 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  55
  56 /** defines how to handle one supported audio format */
  57 struct audio_format_info {
  58         /** pointer to the receiver for this audio format */
  59         struct receiver *receiver;
  60         /** the receiver configuration */
  61         void *receiver_conf;
  62         /** the number of filters that should be activated for this audio format */
  63         unsigned int num_filters;
  64         /** pointer to the array of filters to be activated */
  65         struct filter **filters;
  66         /** pointer to the array of filter configurations */
  67         void **filter_conf;
  68         /** the number of filters that should be activated for this audio format */
  69         unsigned int num_writers;
  70         /** pointer to the array of writers to be activated */
  71         struct writer **writers;
  72         /** pointer to the array of writer configurations */
  73         void **writer_conf;
  74         /** do not start receiver/filters/writer before this time */
  75         struct timeval restart_barrier;
  76 };
  77
  78 /**
  79  * describes one instance of a receiver-filter-writer chain
  80  *
  81  * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
  82  * writer_node, writer_node_group.
  83   */
  84 struct slot_info {
  85         /** number of the audio format in this slot */
  86         int format;
  87         /** time of the last successful read from the receiver */
  88         struct timeval rtime;
  89         /** time the last write to the write fd happend */
  90         struct timeval wtime;
  91         /** writer start time */
  92         struct timeval wstime;
  93         /** the receiver info associated with this slot */
  94         struct receiver_node *receiver_node;
  95         /** the active filter chain */
  96         struct filter_chain *fc;
  97         /** the active writer node group */
  98         struct writer_node_group *wng;
  99 };
 100 static struct slot_info slot[MAX_STREAM_SLOTS];
 101
 102 extern const char *status_item_list[NUM_STAT_ITEMS];
 103
 104 static struct gengetopt_args_info conf;
 105 static struct timeval server_stream_start, sa_time_diff;
 106 static int playing, current_decoder = -1,
 107         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 108         sa_time_diff_sign = 1;
 109 static char *af_status, /* the audio format announced in server status */
 110         *socket_name, *hostname;
 111 static char *stat_item_values[NUM_STAT_ITEMS];
 112 static FILE *logfile;
 113 static const struct timeval restart_delay = {0, 300 * 1000};
 114
 115 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 116
 117 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 118
 119 struct command_task {
 120         int fd;
 121         struct task task;
 122 };
 123 static struct command_task command_task_struct, *cmd_task = &command_task_struct;
 124
 125 struct status_task {
 126         int fd;
 127         struct task task;
 128         char buf[STRINGSIZE];
 129         unsigned loaded;
 130 };
 131 static struct status_task status_task_struct, *stat_task = &status_task_struct;
 132
 133 struct audiod_task {
 134         struct task task;
 135 };
 136 static struct audiod_task audiod_task_struct, *at = &audiod_task_struct;
 137
 138 struct signal_task {
 139         int fd;
 140         int signum;
 141         struct task task;
 142 };
 143
 144
 145 /** defines one command of para_audiod */
 146 struct audiod_command {
 147         /** the name of the command */
 148         const char *name;
 149         /** pointer to the function that handles the command */
 150         int (*handler)(int, int, char**);
 151         int (*line_handler)(int, char*);
 152         /** one-line description of the command */
 153         const char *description;
 154         /** summary of the command line options */
 155         const char *synopsis;
 156         /** the long help text */
 157         const char *help;
 158 };
 159 static int com_grab(int, char *);
 160 static int com_cycle(int, int, char **);
 161 static int com_help(int, int, char **);
 162 static int com_off(int, int, char **);
 163 static int com_on(int, int, char **);
 164 static int com_sb(int, int, char **);
 165 static int com_stat(int, int, char **);
 166 static int com_term(int, int, char **);
 167 static struct audiod_command cmds[] = {
 168 {
 169 .name = "cycle",
 170 .handler = com_cycle,
 171 .description = "switch to next mode",
 172 .synopsis = "cycle",
 173 .help =
 174
 175 "on -> standby -> off -> on\n"
 176
 177 },
 178 {
 179 .name = "grab",
 180 .line_handler = com_grab,
 181 .description = "grab the audio stream",
 182 .synopsis = "-- grab [grab_options]",
 183 .help =
 184
 185 "grab ('splice') the audio stream at any position in the filter      \n"
 186 "chain and send that data back to the client. Try\n"
 187 "\t para_audioc -- grab -h\n"
 188 "for the list of available options.\n"
 189 },
 190
 191 {
 192 .name = "help",
 193 .handler = com_help,
 194 .description = "display command list or help for given command",
 195 .synopsis = "help [command]",
 196 .help =
 197
 198 "When I was younger, so much younger than today, I never needed\n"
 199 "anybody's help in any way. But now these days are gone, I'm not so\n"
 200 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 201 "\n"
 202 "                               -- Beatles: Help\n"
 203
 204 },
 205 {
 206 .name = "off",
 207 .handler = com_off,
 208 .description = "deactivate para_audiod",
 209 .synopsis = "off",
 210 .help =
 211
 212 "Close connection to para_server and stop all decoders.\n"
 213
 214 },
 215 {
 216 .name = "on",
 217 .handler = com_on,
 218 .description = "activate para_audiod",
 219 .synopsis = "on",
 220 .help =
 221
 222 "Establish connection to para_server, retrieve para_server's current\n"
 223 "status. If playing, start corresponding decoder. Otherwise stop\n"
 224 "all decoders.\n"
 225
 226 },
 227 {
 228 .name = "sb",
 229 .handler = com_sb,
 230 .description = "enter standby mode",
 231 .synopsis = "sb",
 232 .help =
 233
 234 "Stop all decoders but leave connection to para_server open.\n"
 235
 236 },
 237 {
 238 .name = "stat",
 239 .handler = com_stat,
 240 .description = "print status information",
 241 .synopsis = "stat [item1 ...]",
 242 .help =
 243
 244 "Dump given status items (all if none given) to stdout.\n"
 245
 246 },
 247 {
 248 .name = "term",
 249 .handler = com_term,
 250 .description = "terminate audiod",
 251 .synopsis = "term",
 252 .help =
 253
 254 "Stop all decoders, shut down connection to para_server and exit.\n"
 255
 256 },
 257 {
 258 .name = NULL,
 259 }
 260 };
 261
 262 /** iterate over all slots */
 263 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
 264 /** iterate over all supported audio formats */
 265 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 266 /** iterate over the array of all audiod commands */
 267 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 268
 269 /**
 270  * get the audio format number
 271  * \param name the name of the audio format
 272  *
 273  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 274  * \a name is not a supported audio format.
 275  */
 276 int get_audio_format_num(char *name)
 277 {
 278         int i;
 279         FOR_EACH_AUDIO_FORMAT(i)
 280                 if (!strcmp(name, audio_formats[i]))
 281                         return i;
 282         return -E_UNSUPPORTED_AUDIO_FORMAT;
 283 }
 284
 285 /*
 286  * log function. first argument is loglevel.
 287  */
 288 void para_log(int ll, const char* fmt,...)
 289 {
 290         va_list argp;
 291         FILE *outfd;
 292         struct tm *tm;
 293         time_t t1;
 294         char str[MAXLINE] = "";
 295
 296         if (ll < conf.loglevel_arg)
 297                 return;
 298         outfd = logfile? logfile : stderr;
 299         time(&t1);
 300         tm = localtime(&t1);
 301         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 302         fprintf(outfd, "%s %s ", str, hostname);
 303         if (conf.loglevel_arg <= INFO)
 304                 fprintf(outfd, "%i ", ll);
 305         va_start(argp, fmt);
 306         vfprintf(outfd, fmt, argp);
 307         va_end(argp);
 308 }
 309
 310 static int client_write(int fd, const char *buf)
 311 {
 312         size_t len = strlen(buf);
 313         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 314 }
 315
 316 static char *get_time_string(struct timeval *newest_stime)
 317 {
 318         struct timeval now, diff, adj_stream_start, tmp;
 319         int total = 0, use_server_time = 1;
 320
 321         if (!playing) {
 322                 if (length_seconds)
 323                         return NULL;
 324                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 325         }
 326         if (audiod_status == AUDIOD_OFF)
 327                 goto out;
 328         if (sa_time_diff_sign > 0)
 329                 tv_diff(&server_stream_start, &sa_time_diff,
 330                         &adj_stream_start);
 331         else
 332                 tv_add(&server_stream_start, &sa_time_diff,
 333                         &adj_stream_start);
 334         tmp = adj_stream_start;
 335         if (newest_stime && audiod_status == AUDIOD_ON) {
 336                 tv_diff(newest_stime, &adj_stream_start, &diff);
 337                 if (tv2ms(&diff) < 5000) {
 338                         tmp = *newest_stime;
 339                         use_server_time = 0;
 340                 }
 341         }
 342         gettimeofday(&now, NULL);
 343         tv_diff(&now, &tmp, &diff);
 344         total = diff.tv_sec + offset_seconds;
 345         if (total > length_seconds)
 346                 total = length_seconds;
 347         if (total < 0)
 348                 total = 0;
 349 out:
 350         return make_message(
 351                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 352                 status_item_list[SI_PLAY_TIME],
 353                 use_server_time? "~" : "",
 354                 total / 60,
 355                 total % 60,
 356                 (length_seconds - total) / 60,
 357                 (length_seconds - total) % 60,
 358                 length_seconds? (total * 100 + length_seconds / 2) /
 359                         length_seconds : 0,
 360                 length_seconds / 60,
 361                 length_seconds % 60
 362         );
 363 }
 364
 365 __malloc static char *audiod_status_string(void)
 366 {
 367         const char *status = (audiod_status == AUDIOD_ON)?
 368                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 369         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 370 }
 371
 372 static struct timeval *wstime(void)
 373 {
 374         int i;
 375         struct timeval *max = NULL;
 376         FOR_EACH_SLOT(i) {
 377                 struct slot_info *s = &slot[i];
 378                 if (!s->wng)
 379                         continue;
 380                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 381                         continue;
 382                 max = &s->wstime;
 383         }
 384         return max;
 385 }
 386 __malloc static char *decoder_flags(void)
 387 {
 388         int i;
 389         char decoder_flags[MAX_STREAM_SLOTS + 1];
 390
 391         FOR_EACH_SLOT(i) {
 392                 struct slot_info *s = &slot[i];
 393                 char flag = '0';
 394                 if (s->receiver_node)
 395                         flag += 1;
 396                 if (s->wng)
 397                         flag += 2;
 398                 decoder_flags[i] = flag;
 399         }
 400         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 401         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 402                 decoder_flags);
 403 }
 404
 405 static char *configfile_exists(void)
 406 {
 407         static char *config_file;
 408
 409         if (!config_file) {
 410                 char *home = para_homedir();
 411                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 412                 free(home);
 413         }
 414         return file_exists(config_file)? config_file : NULL;
 415 }
 416
 417 static void setup_signal_handling(void)
 418 {
 419         sig_task->fd = para_signal_init();
 420         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 421         para_install_sighandler(SIGINT);
 422         para_install_sighandler(SIGTERM);
 423         para_install_sighandler(SIGCHLD);
 424         para_install_sighandler(SIGHUP);
 425         signal(SIGPIPE, SIG_IGN);
 426 }
 427
 428 static void audiod_status_dump(void)
 429 {
 430         static char *p_ts, *p_us, *p_as, *p_df;
 431         struct timeval *t = wstime();
 432         char *us, *tmp = get_time_string(t);
 433
 434         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 435                 stat_client_write(tmp, SI_PLAY_TIME);
 436         free(p_ts);
 437         p_ts = tmp;
 438
 439         us = uptime_str();
 440         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 441         free(us);
 442         if (!p_us || strcmp(p_us, tmp))
 443                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 444         free(p_us);
 445         p_us = tmp;
 446
 447         tmp = audiod_status_string();
 448         if (!p_as || strcmp(p_as, tmp))
 449                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 450         free(p_as);
 451         p_as = tmp;
 452
 453         tmp = decoder_flags();
 454         if (!p_df || strcmp(p_df, tmp))
 455                 stat_client_write(tmp, SI_DECODER_FLAGS);
 456         free(p_df);
 457         p_df = tmp;
 458 }
 459
 460 static void clear_slot(int slot_num)
 461 {
 462         struct slot_info *s = &slot[slot_num];
 463
 464         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 465         memset(s, 0, sizeof(struct slot_info));
 466         s->format = -1;
 467 }
 468
 469 static void set_restart_barrier(int format, struct timeval *now)
 470 {
 471         struct timeval tmp;
 472
 473         if (now)
 474                 tmp = *now;
 475         else
 476                 gettimeofday(&tmp, NULL);
 477         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 478 }
 479
 480 static void close_receiver(int slot_num)
 481 {
 482         struct slot_info *s = &slot[slot_num];
 483         struct audio_format_info *a;
 484
 485         if (s->format < 0 || !s->receiver_node)
 486                 return;
 487         a = &afi[s->format];
 488         PARA_NOTICE_LOG("closing %s recevier in slot %d (eof = %d)\n",
 489                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 490         if (!s->receiver_node->eof)
 491                 unregister_task(&s->receiver_node->task);
 492         a->receiver->close(s->receiver_node);
 493         free(s->receiver_node);
 494         s->receiver_node = NULL;
 495         set_restart_barrier(s->format, NULL);
 496 }
 497 static void close_writer(int slot_num)
 498 {
 499         struct slot_info *s = &slot[slot_num];
 500         if (s->wng) {
 501                 PARA_INFO_LOG("slot %d: closing writer node group\n",
 502                         slot_num);
 503                 wng_close(s->wng);
 504                 s->wng = NULL;
 505         }
 506         if (s->fc)
 507                 *s->fc->output_eof = 1; /* FIXME */
 508 }
 509
 510
 511 static void kill_all_decoders(void)
 512 {
 513         int i;
 514
 515         FOR_EACH_SLOT(i)
 516                 close_writer(i);
 517 }
 518
 519 static void check_sigchld(void)
 520 {
 521         pid_t pid;
 522         struct timeval now;
 523         gettimeofday(&now, NULL);
 524
 525 reap_next_child:
 526         pid = para_reap_child();
 527         if (pid <= 0)
 528                 return;
 529         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 530         goto reap_next_child;
 531 }
 532
 533 static int get_empty_slot(void)
 534 {
 535         int i;
 536         struct slot_info *s;
 537
 538         FOR_EACH_SLOT(i) {
 539                 s = &slot[i];
 540                 if (s->format < 0) {
 541                         clear_slot(i);
 542                         return i;
 543                 }
 544                 if (s->wng)
 545                         continue;
 546                 if (s->receiver_node)
 547                         continue;
 548                 if (s->fc)
 549                         continue;
 550                 clear_slot(i);
 551                 return i;
 552         }
 553         return -E_NO_MORE_SLOTS;
 554 }
 555
 556 static int decoder_running(int format)
 557 {
 558         int i, ret = 0;
 559         struct slot_info *s;
 560
 561         FOR_EACH_SLOT(i) {
 562                 s = &slot[i];
 563                 if (s->format == format && s->receiver_node)
 564                         ret |= 1;
 565                 if (s->format == format && s->wng)
 566                         ret |= 2;
 567         }
 568         return ret;
 569 }
 570
 571 static void close_stat_pipe(void)
 572 {
 573         int i;
 574
 575         if (stat_task->fd < 0)
 576                 return;
 577         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 578         close(stat_task->fd);
 579         del_close_on_fork_list(stat_task->fd);
 580         stat_task->fd = -1;
 581         kill_all_decoders();
 582         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 583                 free(stat_item_values[i]);
 584                 stat_item_values[i] = NULL;
 585         }
 586         dump_empty_status();
 587         length_seconds = 0;
 588         offset_seconds = 0;
 589         audiod_status_dump();
 590         playing = 0;
 591         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 592                 status_item_list[SI_STATUS_BAR]);
 593         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 594 }
 595
 596 static void __noreturn clean_exit(int status, const char *msg)
 597 {
 598         PARA_EMERG_LOG("%s\n", msg);
 599         kill_all_decoders();
 600         if (socket_name)
 601                 unlink(socket_name);
 602         if (stat_task->fd >= 0)
 603                 close_stat_pipe();
 604         exit(status);
 605 }
 606
 607 /** get the number of filters for the given audio format */
 608 int num_filters(int audio_format_num)
 609 {
 610         return afi[audio_format_num].num_filters;
 611 }
 612
 613 void filter_event_handler(struct task *t)
 614 {
 615         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 616         unregister_task(t);
 617 }
 618
 619 static void open_filters(int slot_num)
 620 {
 621         struct slot_info *s = &slot[slot_num];
 622         struct audio_format_info *a = &afi[s->format];
 623         int nf = a->num_filters;
 624         int i;
 625
 626         s->fc = NULL;
 627         if (!nf)
 628                 return;
 629         s->fc = para_calloc(sizeof(struct filter_chain));
 630         INIT_LIST_HEAD(&s->fc->filters);
 631         s->fc->inbuf = s->receiver_node->buf;
 632         s->fc->in_loaded = &s->receiver_node->loaded;
 633         s->fc->input_eof = &s->receiver_node->eof;
 634
 635         s->fc->task.pre_select = filter_pre_select;
 636         s->fc->task.event_handler = filter_event_handler;
 637         s->fc->task.private_data = s->fc;
 638         s->fc->task.flags = 0;
 639         s->fc->eof = 0;
 640         sprintf(s->fc->task.status, "filter chain");
 641         for (i = 0; i < nf; i++) {
 642                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 643                 fn->conf = a->filter_conf[i];
 644                 fn->fc = s->fc;
 645                 fn->filter = a->filters[i];
 646                 INIT_LIST_HEAD(&fn->callbacks);
 647                 list_add_tail(&fn->node, &s->fc->filters);
 648                 fn->filter->open(fn);
 649                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 650                         audio_formats[s->format], i + 1,  nf,
 651                         fn->filter->name, slot_num);
 652                 s->fc->outbuf = fn->buf;
 653                 s->fc->out_loaded = &fn->loaded;
 654         }
 655         register_task(&s->fc->task);
 656 //      PARA_DEBUG_LOG("output loaded for filter chain %p: %p\n", s->fc,
 657 //              s->fc->out_loaded);
 658 }
 659
 660 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 661 {
 662         struct filter_node *fn;
 663         int i, j;
 664
 665         FOR_EACH_SLOT(i) {
 666                 struct slot_info *s = &slot[i];
 667                 if (s->format < 0 || !s->fc)
 668                         continue;
 669                 if (slot_num >= 0 && slot_num != i)
 670                         continue;
 671                 if (format >= 0 && s->format != format)
 672                         continue;
 673                 if (num_filters(i) < filternum)
 674                         continue;
 675                 /* success */
 676                 j = 1;
 677                 list_for_each_entry(fn, &s->fc->filters, node)
 678                         if (filternum <= 0 || j++ == filternum)
 679                                 break;
 680                 return fn;
 681         }
 682         return NULL;
 683 }
 684
 685 static void wng_event_handler(struct task *t)
 686 {
 687         struct writer_node_group *g = t->private_data;
 688         int i;
 689
 690         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 691         unregister_task(t);
 692         FOR_EACH_SLOT(i) {
 693                 if (slot[i].wng != g)
 694                         continue;
 695                 wng_close(g);
 696                 wng_destroy(g);
 697                 slot[i].wng = NULL;
 698         }
 699 }
 700
 701 static void start_stream_writer(int slot_num, struct timeval *now)
 702 {
 703         int ret, i;
 704         struct slot_info *s = &slot[slot_num];
 705         struct audio_format_info *a = &afi[s->format];
 706
 707         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 708         open_filters(slot_num);
 709         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 710         if (!a->num_writers)
 711                 s->wng = setup_default_wng();
 712         else
 713                 s->wng = wng_new(a->num_writers);
 714         if (s->fc) {
 715                 s->wng->buf = s->fc->outbuf;
 716                 s->wng->loaded = s->fc->out_loaded;
 717                 s->wng->input_eof = &s->fc->eof;
 718                 s->fc->output_eof = &s->wng->eof;
 719         } else {
 720                 s->wng->buf = s->receiver_node->buf;
 721                 s->wng->loaded = &s->receiver_node->loaded;
 722                 s->wng->input_eof = &s->receiver_node->eof;
 723         }
 724         s->wng->task.event_handler = wng_event_handler;
 725         for (i = 0; i < a->num_writers; i++) {
 726                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 727                 s->wng->writer_nodes[i].writer = a->writers[i];
 728                 sprintf(s->wng->writer_nodes[i].task.status, "writer_ node");
 729         }
 730         ret = wng_open(s->wng);
 731         s->wstime = *now;
 732         current_decoder = slot_num;
 733         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 734 }
 735
 736 void rn_event_handler(struct task *t)
 737 {
 738 //      struct receiver_node *rn = t->private_data;
 739         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 740         unregister_task(t);
 741 }
 742 static void open_receiver(int format)
 743 {
 744         struct audio_format_info *a = &afi[format];
 745         struct slot_info *s;
 746         int ret, slot_num;
 747         struct receiver_node *rn;
 748
 749         slot_num = get_empty_slot();
 750         if (slot_num < 0)
 751                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 752         s = &slot[slot_num];
 753         s->format = format;
 754         gettimeofday(&s->rtime, NULL);
 755         s->wtime = s->rtime;
 756         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 757         rn = s->receiver_node;
 758         rn->receiver = a->receiver;
 759         rn->conf = a->receiver_conf;
 760         ret = a->receiver->open(s->receiver_node);
 761         if (ret < 0) {
 762                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 763                         PARA_STRERROR(-ret));
 764                 free(s->receiver_node);
 765                 s->receiver_node = NULL;
 766                 return;
 767         }
 768         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 769                 audio_formats[s->format], a->receiver->name, slot_num);
 770         rn->task.private_data = s->receiver_node;
 771         PARA_NOTICE_LOG("rn = %p\n", rn->task.private_data);
 772         rn->task.pre_select = a->receiver->pre_select;
 773         rn->task.post_select = a->receiver->post_select;
 774         rn->task.event_handler = rn_event_handler;
 775         rn->task.flags = 0;
 776         sprintf(rn->task.status, "receiver node");
 777         register_task(&rn->task);
 778 }
 779
 780 static int is_frozen(int format)
 781 {
 782         struct timeval now;
 783         struct audio_format_info *a = &afi[format];
 784
 785         gettimeofday(&now, NULL);
 786         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 787 }
 788
 789 static void start_current_receiver(void)
 790 {
 791         int i;
 792
 793         if (!af_status)
 794                 return;
 795         i = get_audio_format_num(af_status);
 796         if (i < 0)
 797                 return;
 798         if ((decoder_running(i) & 1) || is_frozen(i))
 799                 return;
 800         open_receiver(i);
 801 }
 802
 803 static void compute_time_diff(const struct timeval *status_time)
 804 {
 805         struct timeval now, tmp, diff;
 806         static int count;
 807         int sign;
 808         const struct timeval max_deviation = {0, 500 * 1000};
 809         const int time_smooth = 5;
 810
 811         gettimeofday(&now, NULL);
 812         sign = tv_diff(status_time, &now, &diff);
 813 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 814 //                      sign, sa_time_diff_sign);
 815         if (!count) {
 816                 sa_time_diff_sign = sign;
 817                 sa_time_diff = diff;
 818                 count++;
 819                 return;
 820         }
 821         if (count > 5) {
 822                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 823                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 824                         PARA_WARNING_LOG("time diff jump: %lims\n",
 825                                 s * tv2ms(&tmp));
 826         }
 827         count++;
 828         sa_time_diff_sign = tv_convex_combination(
 829                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 830                 count > 10? sign : sign * time_smooth, &diff,
 831                 &tmp);
 832         sa_time_diff = tmp;
 833         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 834                 sign > 0? "+" : "-",
 835                 tv2ms(&diff),
 836                 sa_time_diff_sign ? "+" : "-",
 837                 tv2ms(&sa_time_diff)
 838         );
 839 }
 840
 841 static void check_stat_line(char *line)
 842 {
 843         int itemnum;
 844         size_t ilen = 0;
 845         long unsigned sec, usec;
 846         char *tmp;
 847
 848 //      PARA_INFO_LOG("line: %s\n", line);
 849         if (!line)
 850                 return;
 851         itemnum = stat_line_valid(line);
 852         if (itemnum < 0) {
 853                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 854                 return;
 855         }
 856         tmp = make_message("%s\n", line);
 857         stat_client_write(tmp, itemnum);
 858         free(tmp);
 859         free(stat_item_values[itemnum]);
 860         stat_item_values[itemnum] = para_strdup(line);
 861         ilen = strlen(status_item_list[itemnum]);
 862         switch (itemnum) {
 863         case SI_STATUS:
 864                 playing = strstr(line, "playing")? 1 : 0;
 865                 break;
 866         case SI_FORMAT:
 867                 free(af_status);
 868                 af_status = para_strdup(line + ilen + 1);
 869                 break;
 870         case SI_OFFSET:
 871                 offset_seconds = atoi(line + ilen + 1);
 872                 break;
 873         case SI_LENGTH:
 874                 length_seconds = atoi(line + ilen + 1);
 875                 break;
 876         case SI_STREAM_START:
 877                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 878                         server_stream_start.tv_sec = sec;
 879                         server_stream_start.tv_usec = usec;
 880                 }
 881                 break;
 882         case SI_CURRENT_TIME:
 883                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 884                         struct timeval tv = {sec, usec};
 885                         compute_time_diff(&tv);
 886                 }
 887                 break;
 888         }
 889 }
 890
 891 static void handle_signal(int sig)
 892 {
 893         switch (sig) {
 894         case SIGCHLD:
 895                 return check_sigchld();
 896         case SIGINT:
 897         case SIGTERM:
 898         case SIGHUP:
 899                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 900                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 901                 return;
 902         }
 903 }
 904
 905 static void check_timeouts(void)
 906 {
 907         struct timeval now;
 908         int slot_num, timeout = conf.stream_timeout_arg;
 909
 910         gettimeofday(&now, NULL);
 911         FOR_EACH_SLOT(slot_num) {
 912                 struct slot_info *s = &slot[slot_num];
 913                 if (s->format < 0)
 914                         continue;
 915                 /* check read time */
 916                 if (s->receiver_node &&
 917                         now.tv_sec > s->rtime.tv_sec + timeout) {
 918                         PARA_INFO_LOG("%s stream (slot %d) not ready\n",
 919                                 audio_formats[s->format], slot_num);
 920                         s->receiver_node->eof = 1;
 921                 }
 922         }
 923 }
 924
 925 static void close_decoder_if_idle(int slot_num)
 926 {
 927         struct slot_info *s = &slot[slot_num];
 928
 929         if (s->format < 0)
 930                 return;
 931         if (!s->fc)
 932                 return;
 933         if (s->wng)
 934                 return;
 935         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 936                 slot_num, s->fc);
 937         close_filters(s->fc);
 938         free(s->fc);
 939         close_receiver(slot_num);
 940         clear_slot(slot_num);
 941 }
 942
 943 static void audiod_pre_select(__a_unused struct sched *s, __a_unused struct task *t)
 944 {
 945         int i;
 946
 947         if (audiod_status != AUDIOD_ON)
 948                 kill_all_decoders();
 949         else if (playing)
 950                 start_current_receiver();
 951         check_timeouts();
 952         FOR_EACH_SLOT(i) {
 953                 struct receiver_node *rn;
 954
 955                 close_decoder_if_idle(i);
 956                 if (slot[i].format < 0)
 957                         continue;
 958                 rn = slot[i].receiver_node;
 959                 if (rn && rn->loaded && !slot[i].wng) {
 960                         PARA_INFO_LOG("no writer in slot %d\n", i);
 961                         start_stream_writer(i, &s->now);
 962                 }
 963         }
 964 }
 965
 966 static void audiod_post_select(struct sched *s, __a_unused struct task *t)
 967 {
 968         int i;
 969
 970         FOR_EACH_SLOT(i) {
 971                 struct receiver_node *rn = slot[i].receiver_node;
 972
 973                 if (rn && rn->loaded)
 974                         slot[i].rtime = s->now;
 975         }
 976 }
 977
 978 static void init_audiod_task(struct audiod_task *at)
 979 {
 980         at->task.pre_select = audiod_pre_select;
 981         at->task.post_select = audiod_post_select;
 982         at->task.private_data = at;
 983         at->task.flags = 0;
 984         sprintf(at->task.status, "audiod task");
 985 }
 986
 987 static int parse_stream_command(const char *txt, char **cmd)
 988 {
 989         char *p = strchr(txt, ':');
 990         int i;
 991
 992         if (!p)
 993                 return -E_MISSING_COLON;
 994         p++;
 995         FOR_EACH_AUDIO_FORMAT(i) {
 996                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 997                         continue;
 998                 *cmd = p;
 999                 return i;
1000         }
1001         return -E_UNSUPPORTED_AUDIO_FORMAT;
1002 }
1003
1004 static int add_filter(int format, char *cmdline)
1005 {
1006         struct audio_format_info *a = &afi[format];
1007         int filter_num, nf = a->num_filters;
1008
1009         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1010         if (filter_num < 0)
1011                 return filter_num;
1012         a->filters[nf] = &filters[filter_num];
1013         a->num_filters++;
1014         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1015                 a->filters[nf]->name);
1016         return filter_num;
1017 }
1018
1019 static int setup_default_filters(void)
1020 {
1021         int i, ret = 1;
1022
1023         FOR_EACH_AUDIO_FORMAT(i) {
1024                 struct audio_format_info *a = &afi[i];
1025                 char *tmp;
1026                 int j;
1027                 if (a->num_filters)
1028                         continue;
1029                 /* add "dec" to audio format name */
1030                 tmp = make_message("%sdec", audio_formats[i]);
1031                 for (j = 0; filters[j].name; j++)
1032                         if (!strcmp(tmp, filters[j].name))
1033                                 break;
1034                 free(tmp);
1035                 ret = -E_UNSUPPORTED_FILTER;
1036                 if (!filters[j].name)
1037                         goto out;
1038                 tmp = para_strdup(filters[j].name);
1039                 ret = add_filter(i, tmp);
1040                 free(tmp);
1041                 if (ret < 0)
1042                         goto out;
1043                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1044                         filters[j].name);
1045                 ret = add_filter(i, "wav");
1046                 if (ret < 0)
1047                         goto out;
1048                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1049         }
1050 out:
1051         return ret;
1052 }
1053
1054 static int init_stream_io(void)
1055 {
1056         int i, ret, receiver_num, nf, nw;
1057         char *cmd;
1058         struct audio_format_info *a;
1059
1060         init_supported_writers();
1061         nw = PARA_MAX(1, conf.writer_given);
1062         PARA_INFO_LOG("allocating space for %d writers\n", nw);
1063         FOR_EACH_AUDIO_FORMAT(i) {
1064                 a = &afi[i];
1065                 a->writer_conf = para_malloc(nw * sizeof(void *));
1066                 a->writers = para_malloc(nw * sizeof(struct writer *));
1067                 a->num_writers = 0;
1068         }
1069         for (i = 0; i < conf.writer_given; i++) {
1070                 void *wconf;
1071                 int writer_num;
1072                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
1073                 if (ret < 0)
1074                         goto out;
1075                 a = &afi[ret];
1076                 nw = a->num_writers;
1077                 wconf = check_writer_arg(cmd, &writer_num);
1078                 if (!wconf) {
1079                         ret = writer_num;
1080                         goto out;
1081                 }
1082                 a->writers[nw] = &writers[ret];
1083                 a->writer_conf[nw] = wconf;
1084                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
1085                         nw, writer_names[writer_num]);
1086                 a->num_writers++;
1087         }
1088         for (i = 0; receivers[i].name; i++) {
1089                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1090                 receivers[i].init(&receivers[i]);
1091         }
1092         for (i = 0; i < conf.receiver_given; i++) {
1093                 char *arg = conf.receiver_arg[i];
1094                 char *recv = strchr(arg, ':');
1095                 ret = -E_MISSING_COLON;
1096                 if (!recv)
1097                         goto out;
1098                 *recv = '\0';
1099                 recv++;
1100                 ret = get_audio_format_num(arg);
1101                 if (ret < 0)
1102                         goto out;
1103                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1104                 if (!afi[ret].receiver_conf) {
1105                         ret = -E_RECV_SYNTAX;
1106                         goto out;
1107                 }
1108                 afi[ret].receiver = &receivers[receiver_num];
1109         }
1110         /* use the first available receiver with no arguments
1111          * for those audio formats for which no receiver
1112          * was specified
1113          */
1114         cmd = para_strdup(receivers[0].name);
1115         FOR_EACH_AUDIO_FORMAT(i) {
1116                 a = &afi[i];
1117                 if (a->receiver_conf)
1118                         continue;
1119                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1120                 if (!a->receiver_conf)
1121                         return -E_RECV_SYNTAX;
1122                 a->receiver = &receivers[receiver_num];
1123         }
1124         free(cmd);
1125         /* filters */
1126         filter_init(filters);
1127         nf = PARA_MAX(2,  conf.filter_given) + 1;
1128         PARA_INFO_LOG("allocating space for %d filters\n", nf);
1129         FOR_EACH_AUDIO_FORMAT(i) {
1130                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
1131                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1132         }
1133         if (!conf.no_default_filters_given)
1134                 return setup_default_filters();
1135         for (i = 0; i < conf.filter_given; i++) {
1136                 char *arg = conf.filter_arg[i];
1137                 char *filter_name = strchr(arg, ':');
1138                 ret = -E_MISSING_COLON;
1139                 if (!filter_name)
1140                         goto out;
1141                 *filter_name = '\0';
1142                 filter_name++;
1143                 ret = get_audio_format_num(arg);
1144                 if (ret < 0)
1145                         goto out;
1146                 ret = add_filter(ret, filter_name);
1147                 if (ret < 0)
1148                         goto out;
1149         }
1150         ret = 1;
1151 out:
1152         return ret;
1153 }
1154
1155 static int dump_commands(int fd)
1156 {
1157         char *buf = para_strdup(""), *tmp = NULL;
1158         int i;
1159         ssize_t ret;
1160
1161         FOR_EACH_COMMAND(i) {
1162                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1163                         cmds[i].description);
1164                 free(buf);
1165                 buf = tmp;
1166         }
1167         ret = client_write(fd, buf);
1168         free(buf);
1169         return ret;
1170 }
1171
1172 /*
1173  * command handlers don't close their fd on errors (ret < 0) so that
1174  * its caller can send an error message. Otherwise (ret >= 0) it's up
1175  * to each individual command to close the fd if necessary.
1176  */
1177
1178 static int com_help(int fd, int argc, char **argv)
1179 {
1180         int i, ret;
1181         char *buf;
1182         const char *dflt = "No such command. Available commands:\n";
1183
1184         if (argc < 2) {
1185                 ret = dump_commands(fd);
1186                 goto out;
1187         }
1188         FOR_EACH_COMMAND(i) {
1189                 if (strcmp(cmds[i].name, argv[1]))
1190                         continue;
1191                 buf = make_message(
1192                         "NAME\n\t%s -- %s\n"
1193                         "SYNOPSIS\n\tpara_audioc %s\n"
1194                         "DESCRIPTION\n%s\n",
1195                         argv[1],
1196                         cmds[i].description,
1197                         cmds[i].synopsis,
1198                         cmds[i].help
1199                 );
1200                 ret = client_write(fd, buf);
1201                 free(buf);
1202                 goto out;
1203         }
1204         ret = client_write(fd, dflt);
1205         if (ret > 0)
1206                 ret = dump_commands(fd);
1207 out:
1208         if (ret >= 0)
1209                 close(fd);
1210         return ret;
1211 }
1212
1213 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1214 {
1215         int i, ret;
1216         char *buf = NULL;
1217         long unsigned mask = ~0LU;
1218
1219         if (argc > 1) {
1220                 mask = 0;
1221                 for (i = 1; i < argc; i++) {
1222                         ret = stat_item_valid(argv[i]);
1223                         if (ret < 0)
1224                                 return ret;
1225                         mask |= (1 << ret);
1226                 }
1227         }
1228         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1229         if (mask & (1 << SI_PLAY_TIME)) {
1230                 struct timeval *t = wstime();
1231                 char *ts = get_time_string(t);
1232                 if (ts) {
1233                         ret = client_write(fd, ts);
1234                         if (ret < 0)
1235                                 goto out;
1236                         free(ts);
1237                 }
1238         }
1239         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1240                 char *tmp, *us = uptime_str();
1241                 tmp = make_message("%s:%s\n",
1242                         status_item_list[SI_AUDIOD_UPTIME], us);
1243                 free(us);
1244                 ret = client_write(fd, tmp);
1245                 if (ret < 0)
1246                         goto out;
1247                 free(tmp);
1248         }
1249         if (mask & (1 << SI_AUDIOD_STATUS)) {
1250                 char *s = audiod_status_string();
1251                 ret = client_write(fd, s);
1252                 if (ret < 0)
1253                         goto out;
1254                 free(s);
1255         }
1256         if (mask & (1 << SI_DECODER_FLAGS)) {
1257                 char *df =decoder_flags();
1258                 ret = client_write(fd, df);
1259                 if (ret < 0)
1260                         goto out;
1261                 free(df);
1262         }
1263
1264         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1265                 char *tmp, *v;
1266                 if (!((1 << i) & mask))
1267                         continue;
1268                 v = stat_item_values[i];
1269                 tmp = make_message("%s%s%s", buf? buf: "",
1270                         v? v : "", v? "\n" : "");
1271                 free(buf);
1272                 buf = tmp;
1273         }
1274         ret = client_write(fd, buf);
1275 out:
1276         if (ret > 0)
1277                 ret = stat_client_add(fd, mask);
1278         free(buf);
1279         return ret;
1280 }
1281
1282 static int com_grab(int fd, char *cmdline)
1283 {
1284         struct grab_client *gc;
1285         struct filter_node *fn;
1286         int i, err;
1287         char *msg;
1288
1289         gc = grab_client_new(fd, cmdline, &err);
1290         if (!gc)
1291                 goto err_out;
1292         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1293         if (fn)
1294                 activate_grab_client(gc, fn);
1295         return 1;
1296 err_out:
1297         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1298                 return err;
1299         if (err == -E_GC_HELP_GIVEN) {
1300                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1301                 for (i = 0; grab_client_args_info_help[i]; i++) {
1302                         char *tmp = make_message("%s%s\n", msg,
1303                                 grab_client_args_info_help[i]);
1304                         free(msg);
1305                         msg = tmp;
1306                 }
1307         } else
1308                 msg = make_message("%s %s\n",
1309                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1310                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1311         err = client_write(fd, msg);
1312         free(msg);
1313         if (err < 0)
1314                 return err;
1315         close(fd);
1316         return 1;
1317 }
1318
1319 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1320 {
1321         close(fd);
1322         clean_exit(EXIT_SUCCESS, "terminating on user request");
1323 }
1324
1325 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1326 {
1327         audiod_status = AUDIOD_ON;
1328         close(fd);
1329         return 1;
1330 }
1331
1332 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1333 {
1334         audiod_status = AUDIOD_OFF;
1335         close(fd);
1336         return 1;
1337 }
1338
1339 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1340 {
1341         audiod_status = AUDIOD_STANDBY;
1342         close(fd);
1343         return 1;
1344 }
1345
1346 static int com_cycle(int fd, int argc, char **argv)
1347 {
1348         switch (audiod_status) {
1349                 case  AUDIOD_ON:
1350                         return com_sb(fd, argc, argv);
1351                         break;
1352                 case  AUDIOD_OFF:
1353                         return com_on(fd, argc, argv);
1354                         break;
1355                 case  AUDIOD_STANDBY:
1356                         return com_off(fd, argc, argv);
1357                         break;
1358         }
1359         close(fd);
1360         return 1;
1361 }
1362
1363 static int check_perms(uid_t uid)
1364 {
1365         int i;
1366
1367         if (!conf.user_allow_given)
1368                 return 1;
1369         for (i = 0; i < conf.user_allow_given; i++)
1370                 if (uid == conf.user_allow_arg[i])
1371                         return 1;
1372         return -E_UCRED_PERM;
1373 }
1374
1375 static int handle_connect(void)
1376 {
1377         int i, argc, ret, clifd = -1;
1378         char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1379         struct sockaddr_un unix_addr;
1380
1381         ret = para_accept(cmd_task->fd, &unix_addr, sizeof(struct sockaddr_un));
1382         if (ret < 0)
1383                 goto out;
1384         clifd = ret;
1385         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1386         if (ret < 0)
1387                 goto out;
1388         PARA_INFO_LOG("connection from user %i, buf: %s\n",  ret, buf);
1389         ret = check_perms(ret);
1390         if (ret < 0)
1391                 goto out;
1392         ret = -E_INVALID_AUDIOD_CMD;
1393         cmd = para_strdup(buf);
1394         p = strchr(cmd, '\n');
1395         if (!p)
1396                 p = "";
1397         else {
1398                 *p = '\0';
1399                 p++;
1400         }
1401         for (i = 0; cmds[i].name; i++) {
1402                 int j;
1403                 if (strcmp(cmds[i].name, cmd))
1404                         continue;
1405                 if (cmds[i].handler) {
1406                         argc = split_args(buf, &argv, "\n");
1407                         PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1408                         ret = cmds[i].handler(clifd, argc, argv);
1409                         goto out;
1410                 }
1411                 for (j = 0; p[j]; j++)
1412                         if (p[j] == '\n')
1413                                 p[j] = ' ';
1414                 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1415                 ret = cmds[i].line_handler(clifd, p);
1416                 goto out;
1417         }
1418         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1419 out:
1420         free(cmd);
1421         free(buf);
1422         free(argv);
1423         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1424                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1425                 client_write(clifd, tmp);
1426                 free(tmp);
1427                 close(clifd);
1428         }
1429         return ret;
1430 }
1431
1432 static void audiod_get_socket(void)
1433 {
1434         struct sockaddr_un unix_addr;
1435
1436         if (conf.socket_given)
1437                 socket_name = para_strdup(conf.socket_arg);
1438         else {
1439                 char *hn = para_hostname();
1440                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1441                         hn);
1442                 free(hn);
1443         }
1444         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1445         if (conf.force_given)
1446                 unlink(socket_name);
1447         cmd_task->fd = create_pf_socket(socket_name, &unix_addr,
1448                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1449         if (cmd_task->fd < 0) {
1450                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1451                 exit(EXIT_FAILURE); /* do not unlink socket */
1452         }
1453         if (listen(cmd_task->fd , 5) < 0) {
1454                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1455                 exit(EXIT_FAILURE); /* do not unlink socket */
1456         }
1457         add_close_on_fork_list(cmd_task->fd);
1458 }
1459
1460 static int open_stat_pipe(void)
1461 {
1462         int ret, fd[3] = {-1, 1, 0};
1463         pid_t pid;
1464         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1465         if (ret >= 0) {
1466                 ret = fd[1];
1467                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1468                 add_close_on_fork_list(ret);
1469         } else
1470                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1471         return ret;
1472 }
1473
1474 void signal_event_handler(struct task *t)
1475 {
1476         struct signal_task *st = t->private_data;
1477         handle_signal(st->signum);
1478 }
1479
1480 void signal_pre_select(struct sched *s, struct task *t)
1481 {
1482         struct signal_task *st = t->private_data;
1483         t->ret = 1;
1484         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1485 }
1486
1487 void signal_post_select(struct sched *s, struct task *t)
1488 {
1489         struct signal_task *st = t->private_data;
1490         t->ret = 1;
1491         if (!FD_ISSET(st->fd, &s->rfds))
1492                 return;
1493         t->ret = -E_SIGNAL_CAUGHT;
1494         st->signum = para_next_signal();
1495 }
1496
1497 void signal_setup_default(struct signal_task *st)
1498 {
1499         st->task.pre_select = signal_pre_select;
1500         st->task.post_select = signal_post_select;
1501         st->task.private_data = st;
1502         st->task.flags = 0;
1503         sprintf(st->task.status, "signal task");
1504 }
1505
1506 static void command_pre_select(struct sched *s, struct task *t)
1507 {
1508         struct command_task *ct = t->private_data;
1509         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1510
1511 }
1512
1513 static void command_post_select(struct sched *s, struct task *t)
1514 {
1515         int ret;
1516         struct command_task *ct = t->private_data;
1517
1518         if (audiod_status != AUDIOD_OFF)
1519                 audiod_status_dump();
1520         t->ret = 1; /* always successful */
1521         if (!FD_ISSET(ct->fd, &s->rfds))
1522                 return;
1523         ret = handle_connect();
1524         if (ret < 0)
1525                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1526 }
1527
1528 void init_command_task(struct command_task *ct)
1529 {
1530         ct->task.pre_select = command_pre_select;
1531         ct->task.post_select = command_post_select;
1532         ct->task.private_data = ct;
1533         ct->task.flags = 0;
1534         sprintf(ct->task.status, "command task");
1535 }
1536
1537 static void status_pre_select(struct sched *s, struct task *t)
1538 {
1539         struct status_task *st = t->private_data;
1540         t->ret = 1;
1541         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
1542                 close_stat_pipe();
1543         if (st->fd < 0 && audiod_status != AUDIOD_OFF) {
1544                 st->fd = open_stat_pipe();
1545                 st->loaded = 0;
1546                 st->buf[0] = '\0';
1547         }
1548         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
1549                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1550 }
1551
1552 static void status_post_select(struct sched *s, struct task *t)
1553 {
1554         struct status_task *st = t->private_data;
1555         int ret;
1556
1557         t->ret = 1;
1558         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1559                 return;
1560         ret = read(st->fd, st->buf + st->loaded,
1561                 STRINGSIZE - 1 - st->loaded);
1562         if (ret <= 0) {
1563                 close_stat_pipe();
1564                 /* avoid busy loop if server is down */
1565                 while (sleep(1) > 0)
1566                         ; /* try again*/
1567         } else {
1568                 st->buf[ret + st->loaded] = '\0';
1569                 st->loaded = for_each_line(st->buf, ret + st->loaded,
1570                         &check_stat_line);
1571         }
1572 }
1573
1574 static void init_status_task(struct status_task *st)
1575 {
1576         st->task.pre_select = status_pre_select;
1577         st->task.post_select = status_post_select;
1578         st->task.private_data = st;
1579         st->task.flags = 0;
1580         st->loaded = 0;
1581         st->fd = -1;
1582         st->buf[0] = '\0';
1583         sprintf(st->task.status, "status task");
1584 }
1585
1586 static void set_initial_status(void)
1587 {
1588         audiod_status = AUDIOD_ON;
1589         if (!conf.mode_given)
1590                 return;
1591         if (!strcmp(conf.mode_arg, "sb")) {
1592                 audiod_status = AUDIOD_STANDBY;
1593                 return;
1594         }
1595         if (!strcmp(conf.mode_arg, "off")) {
1596                 audiod_status = AUDIOD_OFF;
1597                 return;
1598         }
1599         if (strcmp(conf.mode_arg, "on"))
1600                 PARA_WARNING_LOG("%s", "invalid mode\n");
1601 }
1602
1603 int main(int argc, char *argv[])
1604 {
1605         char *cf;
1606         int ret, i;
1607         struct sched s;
1608
1609         init_sched();
1610
1611         valid_fd_012();
1612         hostname = para_hostname();
1613         cmdline_parser(argc, argv, &conf);
1614         para_drop_privileges(conf.user_arg, conf.group_arg);
1615         cf = configfile_exists();
1616         if (cf) {
1617                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1618                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1619                         exit(EXIT_FAILURE);
1620                 }
1621         }
1622         if (conf.logfile_given)
1623                 logfile = open_log(conf.logfile_arg);
1624         log_welcome("para_audiod", conf.loglevel_arg);
1625         i = init_stream_io();
1626         if (i < 0) {
1627                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1628                 exit(EXIT_FAILURE);
1629         }
1630         server_uptime(UPTIME_SET);
1631         set_initial_status();
1632         FOR_EACH_SLOT(i)
1633                 clear_slot(i);
1634         init_grabbing();
1635         setup_signal_handling();
1636         if (conf.daemon_given)
1637                 daemon_init();
1638         audiod_get_socket(); /* doesn't return on errors */
1639
1640         signal_setup_default(sig_task);
1641         sig_task->task.event_handler = signal_event_handler;
1642
1643         init_status_task(stat_task);
1644         init_command_task(cmd_task);
1645         init_audiod_task(at);
1646
1647         register_task(&sig_task->task);
1648         register_task(&cmd_task->task);
1649         register_task(&stat_task->task);
1650         register_task(&at->task);
1651         s.default_timeout.tv_sec = 0;
1652         s.default_timeout.tv_usec = 99 * 1000;
1653         ret = sched(&s);
1654
1655         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1656         return EXIT_FAILURE;
1657 }