code.delx.au - pulseaudio/blob - src/polyp/context.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <assert.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32 #include <sys/stat.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35 #include <limits.h>
  36
  37 #ifdef HAVE_SYS_WAIT_H
  38 #include <sys/wait.h>
  39 #endif
  40
  41 #ifdef HAVE_SYS_SOCKET_H
  42 #include <sys/socket.h>
  43 #endif
  44 #ifdef HAVE_NETDB_H
  45 #include <netdb.h>
  46 #endif
  47
  48 #include "../polypcore/winsock.h"
  49
  50 #include <polyp/version.h>
  51
  52 #include <polypcore/native-common.h>
  53 #include <polypcore/pdispatch.h>
  54 #include <polypcore/pstream.h>
  55 #include <polypcore/dynarray.h>
  56 #include <polypcore/socket-client.h>
  57 #include <polypcore/pstream-util.h>
  58 #include <polypcore/util.h>
  59 #include <polypcore/xmalloc.h>
  60 #include <polypcore/log.h>
  61 #include <polypcore/socket-util.h>
  62
  63 #include "internal.h"
  64
  65 #include "client-conf.h"
  66
  67 #ifdef HAVE_X11
  68 #include "client-conf-x11.h"
  69 #endif
  70
  71 #include "context.h"
  72
  73 #define AUTOSPAWN_LOCK "autospawn.lock"
  74
  75 static const pa_pdispatch_cb_t command_table[PA_COMMAND_MAX] = {
  76     [PA_COMMAND_REQUEST] = pa_command_request,
  77     [PA_COMMAND_OVERFLOW] = pa_command_overflow_or_underflow,
  78     [PA_COMMAND_UNDERFLOW] = pa_command_overflow_or_underflow,
  79     [PA_COMMAND_PLAYBACK_STREAM_KILLED] = pa_command_stream_killed,
  80     [PA_COMMAND_RECORD_STREAM_KILLED] = pa_command_stream_killed,
  81     [PA_COMMAND_SUBSCRIBE_EVENT] = pa_command_subscribe_event
  82 };
  83
  84 static void unlock_autospawn_lock_file(pa_context *c) {
  85     assert(c);
  86
  87     if (c->autospawn_lock_fd >= 0) {
  88         char lf[PATH_MAX];
  89         pa_runtime_path(AUTOSPAWN_LOCK, lf, sizeof(lf));
  90
  91         pa_unlock_lockfile(lf, c->autospawn_lock_fd);
  92         c->autospawn_lock_fd = -1;
  93     }
  94 }
  95
  96 pa_context *pa_context_new(pa_mainloop_api *mainloop, const char *name) {
  97     pa_context *c;
  98
  99     assert(mainloop);
 100     assert(name);
 101
 102     c = pa_xnew(pa_context, 1);
 103     c->ref = 1;
 104     c->name = pa_xstrdup(name);
 105     c->mainloop = mainloop;
 106     c->client = NULL;
 107     c->pstream = NULL;
 108     c->pdispatch = NULL;
 109     c->playback_streams = pa_dynarray_new();
 110     c->record_streams = pa_dynarray_new();
 111
 112     PA_LLIST_HEAD_INIT(pa_stream, c->streams);
 113     PA_LLIST_HEAD_INIT(pa_operation, c->operations);
 114
 115     c->error = PA_OK;
 116     c->state = PA_CONTEXT_UNCONNECTED;
 117     c->ctag = 0;
 118     c->csyncid = 0;
 119
 120     c->state_callback = NULL;
 121     c->state_userdata = NULL;
 122
 123     c->subscribe_callback = NULL;
 124     c->subscribe_userdata = NULL;
 125
 126     c->memblock_stat = pa_memblock_stat_new();
 127     c->local = -1;
 128     c->server_list = NULL;
 129     c->server = NULL;
 130     c->autospawn_lock_fd = -1;
 131     memset(&c->spawn_api, 0, sizeof(c->spawn_api));
 132     c->do_autospawn = 0;
 133
 134 #ifdef SIGPIPE
 135     pa_check_signal_is_blocked(SIGPIPE);
 136 #endif
 137
 138     c->conf = pa_client_conf_new();
 139     pa_client_conf_load(c->conf, NULL);
 140 #ifdef HAVE_X11
 141     pa_client_conf_from_x11(c->conf, NULL);
 142 #endif
 143     pa_client_conf_env(c->conf);
 144
 145     return c;
 146 }
 147
 148 static void context_free(pa_context *c) {
 149     assert(c);
 150
 151     unlock_autospawn_lock_file(c);
 152
 153     while (c->operations)
 154         pa_operation_cancel(c->operations);
 155
 156     while (c->streams)
 157         pa_stream_set_state(c->streams, PA_STREAM_TERMINATED);
 158
 159     if (c->client)
 160         pa_socket_client_unref(c->client);
 161     if (c->pdispatch)
 162         pa_pdispatch_unref(c->pdispatch);
 163     if (c->pstream) {
 164         pa_pstream_close(c->pstream);
 165         pa_pstream_unref(c->pstream);
 166     }
 167
 168     if (c->record_streams)
 169         pa_dynarray_free(c->record_streams, NULL, NULL);
 170     if (c->playback_streams)
 171         pa_dynarray_free(c->playback_streams, NULL, NULL);
 172
 173     pa_memblock_stat_unref(c->memblock_stat);
 174
 175     if (c->conf)
 176         pa_client_conf_free(c->conf);
 177
 178     pa_strlist_free(c->server_list);
 179
 180     pa_xfree(c->name);
 181     pa_xfree(c->server);
 182     pa_xfree(c);
 183 }
 184
 185 pa_context* pa_context_ref(pa_context *c) {
 186     assert(c);
 187     assert(c->ref >= 1);
 188
 189     c->ref++;
 190     return c;
 191 }
 192
 193 void pa_context_unref(pa_context *c) {
 194     assert(c);
 195     assert(c->ref >= 1);
 196
 197     if (--c->ref <= 0)
 198         context_free(c);
 199 }
 200
 201 void pa_context_set_state(pa_context *c, pa_context_state_t st) {
 202     assert(c);
 203     assert(c->ref >= 1);
 204
 205     if (c->state == st)
 206         return;
 207
 208     pa_context_ref(c);
 209
 210     if (st == PA_CONTEXT_FAILED || st == PA_CONTEXT_TERMINATED) {
 211         pa_stream *s;
 212
 213         s = c->streams ? pa_stream_ref(c->streams) : NULL;
 214         while (s) {
 215             pa_stream *n = s->next ? pa_stream_ref(s->next) : NULL;
 216             pa_stream_set_state(s, st == PA_CONTEXT_FAILED ? PA_STREAM_FAILED : PA_STREAM_TERMINATED);
 217             pa_stream_unref(s);
 218             s = n;
 219         }
 220
 221         if (c->pdispatch)
 222             pa_pdispatch_unref(c->pdispatch);
 223         c->pdispatch = NULL;
 224
 225         if (c->pstream) {
 226             pa_pstream_close(c->pstream);
 227             pa_pstream_unref(c->pstream);
 228         }
 229         c->pstream = NULL;
 230
 231         if (c->client)
 232             pa_socket_client_unref(c->client);
 233         c->client = NULL;
 234     }
 235
 236     c->state = st;
 237     if (c->state_callback)
 238         c->state_callback(c, c->state_userdata);
 239
 240     pa_context_unref(c);
 241 }
 242
 243 void pa_context_fail(pa_context *c, int error) {
 244     assert(c);
 245     assert(c->ref >= 1);
 246
 247     pa_context_set_error(c, error);
 248     pa_context_set_state(c, PA_CONTEXT_FAILED);
 249 }
 250
 251 int pa_context_set_error(pa_context *c, int error) {
 252     assert(error >= 0);
 253     assert(error < PA_ERR_MAX);
 254
 255     if (c)
 256         c->error = error;
 257
 258     return error;
 259 }
 260
 261 static void pstream_die_callback(pa_pstream *p, void *userdata) {
 262     pa_context *c = userdata;
 263
 264     assert(p);
 265     assert(c);
 266
 267     pa_context_fail(c, PA_ERR_CONNECTIONTERMINATED);
 268 }
 269
 270 static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, void *userdata) {
 271     pa_context *c = userdata;
 272
 273     assert(p);
 274     assert(packet);
 275     assert(c);
 276
 277     pa_context_ref(c);
 278
 279     if (pa_pdispatch_run(c->pdispatch, packet, c) < 0)
 280         pa_context_fail(c, PA_ERR_PROTOCOL);
 281
 282     pa_context_unref(c);
 283 }
 284
 285 static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, int64_t offset, pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata) {
 286     pa_context *c = userdata;
 287     pa_stream *s;
 288
 289     assert(p);
 290     assert(chunk);
 291     assert(chunk->memblock);
 292     assert(chunk->length);
 293     assert(c);
 294     assert(c->ref >= 1);
 295
 296     pa_context_ref(c);
 297
 298     if ((s = pa_dynarray_get(c->record_streams, channel))) {
 299
 300         pa_memblockq_seek(s->record_memblockq, offset, seek);
 301         pa_memblockq_push_align(s->record_memblockq, chunk);
 302
 303         if (s->read_callback) {
 304             size_t l;
 305
 306             if ((l = pa_memblockq_get_length(s->record_memblockq)) > 0)
 307                 s->read_callback(s, l, s->read_userdata);
 308         }
 309     }
 310
 311     pa_context_unref(c);
 312 }
 313
 314 int pa_context_handle_error(pa_context *c, uint32_t command, pa_tagstruct *t) {
 315     assert(c);
 316     assert(c->ref >= 1);
 317
 318     if (command == PA_COMMAND_ERROR) {
 319         assert(t);
 320
 321         if (pa_tagstruct_getu32(t, &c->error) < 0) {
 322             pa_context_fail(c, PA_ERR_PROTOCOL);
 323             return -1;
 324
 325         }
 326     } else if (command == PA_COMMAND_TIMEOUT)
 327         c->error = PA_ERR_TIMEOUT;
 328     else {
 329         pa_context_fail(c, PA_ERR_PROTOCOL);
 330         return -1;
 331     }
 332
 333     return 0;
 334 }
 335
 336 static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
 337     pa_context *c = userdata;
 338
 339     assert(pd);
 340     assert(c);
 341     assert(c->state == PA_CONTEXT_AUTHORIZING || c->state == PA_CONTEXT_SETTING_NAME);
 342
 343     pa_context_ref(c);
 344
 345     if (command != PA_COMMAND_REPLY) {
 346
 347         if (pa_context_handle_error(c, command, t) < 0)
 348             pa_context_fail(c, PA_ERR_PROTOCOL);
 349
 350         pa_context_fail(c, c->error);
 351         goto finish;
 352     }
 353
 354     switch(c->state) {
 355         case PA_CONTEXT_AUTHORIZING: {
 356             pa_tagstruct *reply;
 357             reply = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag);
 358             pa_tagstruct_puts(reply, c->name);
 359             pa_pstream_send_tagstruct(c->pstream, reply);
 360             pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c);
 361
 362             pa_context_set_state(c, PA_CONTEXT_SETTING_NAME);
 363             break;
 364         }
 365
 366         case PA_CONTEXT_SETTING_NAME :
 367             pa_context_set_state(c, PA_CONTEXT_READY);
 368             break;
 369
 370         default:
 371             assert(0);
 372     }
 373
 374 finish:
 375     pa_context_unref(c);
 376 }
 377
 378 static void setup_context(pa_context *c, pa_iochannel *io) {
 379     pa_tagstruct *t;
 380     uint32_t tag;
 381
 382     assert(c);
 383     assert(io);
 384
 385     pa_context_ref(c);
 386
 387     assert(!c->pstream);
 388     c->pstream = pa_pstream_new(c->mainloop, io, c->memblock_stat);
 389
 390     pa_pstream_set_die_callback(c->pstream, pstream_die_callback, c);
 391     pa_pstream_set_recieve_packet_callback(c->pstream, pstream_packet_callback, c);
 392     pa_pstream_set_recieve_memblock_callback(c->pstream, pstream_memblock_callback, c);
 393
 394     assert(!c->pdispatch);
 395     c->pdispatch = pa_pdispatch_new(c->mainloop, command_table, PA_COMMAND_MAX);
 396
 397     if (!c->conf->cookie_valid) {
 398         pa_context_fail(c, PA_ERR_AUTHKEY);
 399         goto finish;
 400     }
 401
 402     t = pa_tagstruct_command(c, PA_COMMAND_AUTH, &tag);
 403     pa_tagstruct_put_arbitrary(t, c->conf->cookie, sizeof(c->conf->cookie));
 404     pa_pstream_send_tagstruct(c->pstream, t);
 405     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c);
 406
 407     pa_context_set_state(c, PA_CONTEXT_AUTHORIZING);
 408
 409 finish:
 410
 411     pa_context_unref(c);
 412 }
 413
 414 static void on_connection(pa_socket_client *client, pa_iochannel*io, void *userdata);
 415
 416 #ifndef OS_IS_WIN32
 417
 418 static int context_connect_spawn(pa_context *c) {
 419     pid_t pid;
 420     int status, r;
 421     int fds[2] = { -1, -1} ;
 422     pa_iochannel *io;
 423
 424     pa_context_ref(c);
 425
 426     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
 427         pa_log(__FILE__": socketpair() failed: %s", strerror(errno));
 428         pa_context_fail(c, PA_ERR_INTERNAL);
 429         goto fail;
 430     }
 431
 432     pa_fd_set_cloexec(fds[0], 1);
 433
 434     pa_socket_low_delay(fds[0]);
 435     pa_socket_low_delay(fds[1]);
 436
 437     if (c->spawn_api.prefork)
 438         c->spawn_api.prefork();
 439
 440     if ((pid = fork()) < 0) {
 441         pa_log(__FILE__": fork() failed: %s", strerror(errno));
 442         pa_context_fail(c, PA_ERR_INTERNAL);
 443
 444         if (c->spawn_api.postfork)
 445             c->spawn_api.postfork();
 446
 447         goto fail;
 448     } else if (!pid) {
 449         /* Child */
 450
 451         char t[128];
 452         const char *state = NULL;
 453 #define MAX_ARGS 64
 454         const char * argv[MAX_ARGS+1];
 455         int n;
 456
 457         /* Not required, since fds[0] has CLOEXEC enabled anyway */
 458         close(fds[0]);
 459
 460         if (c->spawn_api.atfork)
 461             c->spawn_api.atfork();
 462
 463         /* Setup argv */
 464
 465         n = 0;
 466
 467         argv[n++] = c->conf->daemon_binary;
 468         argv[n++] = "--daemonize=yes";
 469
 470         snprintf(t, sizeof(t), "-Lmodule-native-protocol-fd fd=%i", fds[1]);
 471         argv[n++] = strdup(t);
 472
 473         while (n < MAX_ARGS) {
 474             char *a;
 475
 476             if (!(a = pa_split_spaces(c->conf->extra_arguments, &state)))
 477                 break;
 478
 479             argv[n++] = a;
 480         }
 481
 482         argv[n++] = NULL;
 483
 484         execv(argv[0], (char * const *) argv);
 485         _exit(1);
 486 #undef MAX_ARGS
 487     }
 488
 489     /* Parent */
 490
 491     r = waitpid(pid, &status, 0);
 492
 493     if (c->spawn_api.postfork)
 494         c->spawn_api.postfork();
 495
 496     if (r < 0) {
 497         pa_log(__FILE__": waitpid() failed: %s", strerror(errno));
 498         pa_context_fail(c, PA_ERR_INTERNAL);
 499         goto fail;
 500     } else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 501         pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 502         goto fail;
 503     }
 504
 505     close(fds[1]);
 506
 507     c->local = 1;
 508
 509     io = pa_iochannel_new(c->mainloop, fds[0], fds[0]);
 510
 511     setup_context(c, io);
 512     unlock_autospawn_lock_file(c);
 513
 514     pa_context_unref(c);
 515
 516     return 0;
 517
 518 fail:
 519     if (fds[0] != -1)
 520         close(fds[0]);
 521     if (fds[1] != -1)
 522         close(fds[1]);
 523
 524     unlock_autospawn_lock_file(c);
 525
 526     pa_context_unref(c);
 527
 528     return -1;
 529 }
 530
 531 #endif /* OS_IS_WIN32 */
 532
 533 static int try_next_connection(pa_context *c) {
 534     char *u = NULL;
 535     int r = -1;
 536
 537     assert(c);
 538     assert(!c->client);
 539
 540     for (;;) {
 541         pa_xfree(u);
 542         u = NULL;
 543
 544         c->server_list = pa_strlist_pop(c->server_list, &u);
 545
 546         if (!u) {
 547
 548 #ifndef OS_IS_WIN32
 549             if (c->do_autospawn) {
 550                 r = context_connect_spawn(c);
 551                 goto finish;
 552             }
 553 #endif
 554
 555             pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 556             goto finish;
 557         }
 558
 559         pa_log_debug(__FILE__": Trying to connect to %s...", u);
 560
 561         pa_xfree(c->server);
 562         c->server = pa_xstrdup(u);
 563
 564         if (!(c->client = pa_socket_client_new_string(c->mainloop, u, PA_NATIVE_DEFAULT_PORT)))
 565             continue;
 566
 567         c->local = pa_socket_client_is_local(c->client);
 568         pa_socket_client_set_callback(c->client, on_connection, c);
 569         break;
 570     }
 571
 572     r = 0;
 573
 574 finish:
 575     pa_xfree(u);
 576
 577     return r;
 578 }
 579
 580 static void on_connection(pa_socket_client *client, pa_iochannel*io, void *userdata) {
 581     pa_context *c = userdata;
 582
 583     assert(client);
 584     assert(c);
 585     assert(c->state == PA_CONTEXT_CONNECTING);
 586
 587     pa_context_ref(c);
 588
 589     pa_socket_client_unref(client);
 590     c->client = NULL;
 591
 592     if (!io) {
 593         /* Try the item in the list */
 594         if (errno == ECONNREFUSED || errno == ETIMEDOUT || errno == EHOSTUNREACH) {
 595             try_next_connection(c);
 596             goto finish;
 597         }
 598
 599         pa_context_fail(c, PA_ERR_CONNECTIONREFUSED);
 600         goto finish;
 601     }
 602
 603     unlock_autospawn_lock_file(c);
 604     setup_context(c, io);
 605
 606 finish:
 607     pa_context_unref(c);
 608 }
 609
 610 int pa_context_connect(
 611         pa_context *c,
 612         const char *server,
 613         pa_context_flags_t flags,
 614         const pa_spawn_api *api) {
 615
 616     int r = -1;
 617
 618     assert(c);
 619     assert(c->ref >= 1);
 620
 621     PA_CHECK_VALIDITY(c, c->state == PA_CONTEXT_UNCONNECTED, PA_ERR_BADSTATE);
 622     PA_CHECK_VALIDITY(c, !(flags & ~PA_CONTEXT_NOAUTOSPAWN), PA_ERR_INVALID);
 623     PA_CHECK_VALIDITY(c, !server || *server, PA_ERR_INVALID);
 624
 625     if (!server)
 626         server = c->conf->default_server;
 627
 628     pa_context_ref(c);
 629
 630     assert(!c->server_list);
 631
 632     if (server) {
 633         if (!(c->server_list = pa_strlist_parse(server))) {
 634             pa_context_fail(c, PA_ERR_INVALIDSERVER);
 635             goto finish;
 636         }
 637     } else {
 638         char *d;
 639         char ufn[PATH_MAX];
 640
 641         /* Prepend in reverse order */
 642
 643         if ((d = getenv("DISPLAY"))) {
 644             char *e;
 645             d = pa_xstrdup(d);
 646             if ((e = strchr(d, ':')))
 647                 *e = 0;
 648
 649             if (*d)
 650                 c->server_list = pa_strlist_prepend(c->server_list, d);
 651
 652             pa_xfree(d);
 653         }
 654
 655         c->server_list = pa_strlist_prepend(c->server_list, "tcp6:localhost");
 656         c->server_list = pa_strlist_prepend(c->server_list, "localhost");
 657         c->server_list = pa_strlist_prepend(c->server_list, pa_runtime_path(PA_NATIVE_DEFAULT_UNIX_SOCKET, ufn, sizeof(ufn)));
 658
 659         /* Wrap the connection attempts in a single transaction for sane autospawn locking */
 660         if (!(flags & PA_CONTEXT_NOAUTOSPAWN) && c->conf->autospawn) {
 661             char lf[PATH_MAX];
 662
 663             pa_runtime_path(AUTOSPAWN_LOCK, lf, sizeof(lf));
 664             pa_make_secure_parent_dir(lf);
 665             assert(c->autospawn_lock_fd <= 0);
 666             c->autospawn_lock_fd = pa_lock_lockfile(lf);
 667
 668             if (api)
 669                 c->spawn_api = *api;
 670             c->do_autospawn = 1;
 671         }
 672
 673     }
 674
 675     pa_context_set_state(c, PA_CONTEXT_CONNECTING);
 676     r = try_next_connection(c);
 677
 678 finish:
 679     pa_context_unref(c);
 680
 681     return r;
 682 }
 683
 684 void pa_context_disconnect(pa_context *c) {
 685     assert(c);
 686     assert(c->ref >= 1);
 687
 688     pa_context_set_state(c, PA_CONTEXT_TERMINATED);
 689 }
 690
 691 pa_context_state_t pa_context_get_state(pa_context *c) {
 692     assert(c);
 693     assert(c->ref >= 1);
 694
 695     return c->state;
 696 }
 697
 698 int pa_context_errno(pa_context *c) {
 699     assert(c);
 700     assert(c->ref >= 1);
 701
 702     return c->error;
 703 }
 704
 705 void pa_context_set_state_callback(pa_context *c, pa_context_notify_cb_t cb, void *userdata) {
 706     assert(c);
 707     assert(c->ref >= 1);
 708
 709     c->state_callback = cb;
 710     c->state_userdata = userdata;
 711 }
 712
 713 int pa_context_is_pending(pa_context *c) {
 714     assert(c);
 715     assert(c->ref >= 1);
 716
 717 /*     pa_log("pstream: %i", pa_pstream_is_pending(c->pstream)); */
 718 /*     pa_log("pdispatch: %i", pa_pdispatch_is_pending(c->pdispatch)); */
 719
 720     return (c->pstream && pa_pstream_is_pending(c->pstream)) ||
 721         (c->pdispatch && pa_pdispatch_is_pending(c->pdispatch)) ||
 722         c->client;
 723 }
 724
 725 static void set_dispatch_callbacks(pa_operation *o);
 726
 727 static void pdispatch_drain_callback(PA_GCC_UNUSED pa_pdispatch*pd, void *userdata) {
 728     set_dispatch_callbacks(userdata);
 729 }
 730
 731 static void pstream_drain_callback(PA_GCC_UNUSED pa_pstream *s, void *userdata) {
 732     set_dispatch_callbacks(userdata);
 733 }
 734
 735 static void set_dispatch_callbacks(pa_operation *o) {
 736     int done = 1;
 737
 738     assert(o);
 739     assert(o->ref >= 1);
 740     assert(o->context);
 741     assert(o->context->ref >= 1);
 742     assert(o->context->state == PA_CONTEXT_READY);
 743
 744     pa_pstream_set_drain_callback(o->context->pstream, NULL, NULL);
 745     pa_pdispatch_set_drain_callback(o->context->pdispatch, NULL, NULL);
 746
 747     if (pa_pdispatch_is_pending(o->context->pdispatch)) {
 748         pa_pdispatch_set_drain_callback(o->context->pdispatch, pdispatch_drain_callback, o);
 749         done = 0;
 750     }
 751
 752     if (pa_pstream_is_pending(o->context->pstream)) {
 753         pa_pstream_set_drain_callback(o->context->pstream, pstream_drain_callback, o);
 754         done = 0;
 755     }
 756
 757     if (!done)
 758         pa_operation_ref(o);
 759     else {
 760         if (o->callback) {
 761             pa_context_notify_cb_t cb = (pa_context_notify_cb_t) o->callback;
 762             cb(o->context, o->userdata);
 763         }
 764
 765         pa_operation_done(o);
 766     }
 767
 768     pa_operation_unref(o);
 769 }
 770
 771 pa_operation* pa_context_drain(pa_context *c, pa_context_notify_cb_t cb, void *userdata) {
 772     pa_operation *o;
 773
 774     assert(c);
 775     assert(c->ref >= 1);
 776
 777     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 778     PA_CHECK_VALIDITY_RETURN_NULL(c, pa_context_is_pending(c), PA_ERR_BADSTATE);
 779
 780     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 781     set_dispatch_callbacks(pa_operation_ref(o));
 782
 783     return o;
 784 }
 785
 786 void pa_context_simple_ack_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
 787     pa_operation *o = userdata;
 788     int success = 1;
 789
 790     assert(pd);
 791     assert(o);
 792     assert(o->ref >= 1);
 793     assert(o->context);
 794
 795     if (command != PA_COMMAND_REPLY) {
 796         if (pa_context_handle_error(o->context, command, t) < 0)
 797             goto finish;
 798
 799         success = 0;
 800     } else if (!pa_tagstruct_eof(t)) {
 801         pa_context_fail(o->context, PA_ERR_PROTOCOL);
 802         goto finish;
 803     }
 804
 805     if (o->callback) {
 806         pa_context_success_cb_t cb = (pa_context_success_cb_t) o->callback;
 807         cb(o->context, success, o->userdata);
 808     }
 809
 810 finish:
 811     pa_operation_done(o);
 812     pa_operation_unref(o);
 813 }
 814
 815 pa_operation* pa_context_exit_daemon(pa_context *c, pa_context_success_cb_t cb, void *userdata) {
 816     pa_tagstruct *t;
 817     pa_operation *o;
 818     uint32_t tag;
 819
 820     assert(c);
 821     assert(c->ref >= 1);
 822
 823     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 824
 825     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 826
 827     t = pa_tagstruct_command(c, PA_COMMAND_EXIT, &tag);
 828     pa_pstream_send_tagstruct(c->pstream, t);
 829     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o));
 830
 831     return o;
 832 }
 833
 834 pa_operation* pa_context_send_simple_command(pa_context *c, uint32_t command, pa_pdispatch_cb_t internal_cb, pa_operation_cb_t cb, void *userdata) {
 835     pa_tagstruct *t;
 836     pa_operation *o;
 837     uint32_t tag;
 838
 839     assert(c);
 840     assert(c->ref >= 1);
 841
 842     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 843
 844     o = pa_operation_new(c, NULL, cb, userdata);
 845
 846     t = pa_tagstruct_command(c, command, &tag);
 847     pa_pstream_send_tagstruct(c->pstream, t);
 848     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, internal_cb, pa_operation_ref(o));
 849
 850     return o;
 851 }
 852
 853 pa_operation* pa_context_set_default_sink(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 854     pa_tagstruct *t;
 855     pa_operation *o;
 856     uint32_t tag;
 857
 858     assert(c);
 859     assert(c->ref >= 1);
 860
 861     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 862
 863     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 864
 865     t = pa_tagstruct_command(c, PA_COMMAND_SET_DEFAULT_SINK, &tag);
 866     pa_tagstruct_puts(t, name);
 867     pa_pstream_send_tagstruct(c->pstream, t);
 868     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o));
 869
 870     return o;
 871 }
 872
 873 pa_operation* pa_context_set_default_source(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 874     pa_tagstruct *t;
 875     pa_operation *o;
 876     uint32_t tag;
 877
 878     assert(c);
 879     assert(c->ref >= 1);
 880
 881     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 882
 883     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 884
 885     t = pa_tagstruct_command(c, PA_COMMAND_SET_DEFAULT_SOURCE, &tag);
 886     pa_tagstruct_puts(t, name);
 887     pa_pstream_send_tagstruct(c->pstream, t);
 888     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o));
 889
 890     return o;
 891 }
 892
 893 int pa_context_is_local(pa_context *c) {
 894     assert(c);
 895
 896     return c->local;
 897 }
 898
 899 pa_operation* pa_context_set_name(pa_context *c, const char *name, pa_context_success_cb_t cb, void *userdata) {
 900     pa_tagstruct *t;
 901     pa_operation *o;
 902     uint32_t tag;
 903
 904     assert(c);
 905     assert(c->ref >= 1);
 906     assert(name);
 907
 908     PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
 909
 910     o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);
 911
 912     t = pa_tagstruct_command(c, PA_COMMAND_SET_CLIENT_NAME, &tag);
 913     pa_tagstruct_puts(t, name);
 914     pa_pstream_send_tagstruct(c->pstream, t);
 915     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, pa_operation_ref(o));
 916
 917     return o;
 918 }
 919
 920 const char* pa_get_library_version(void) {
 921     return PACKAGE_VERSION;
 922 }
 923
 924 const char* pa_context_get_server(pa_context *c) {
 925     assert(c);
 926     assert(c->ref >= 1);
 927
 928     if (!c->server)
 929         return NULL;
 930
 931     if (*c->server == '{') {
 932         char *e = strchr(c->server+1, '}');
 933         return e ? e+1 : c->server;
 934     }
 935
 936     return c->server;
 937 }
 938
 939 pa_tagstruct *pa_tagstruct_command(pa_context *c, uint32_t command, uint32_t *tag) {
 940     pa_tagstruct *t;
 941
 942     assert(c);
 943     assert(tag);
 944
 945     t = pa_tagstruct_new(NULL, 0);
 946     pa_tagstruct_putu32(t, command);
 947     pa_tagstruct_putu32(t, *tag = c->ctag++);
 948
 949     return t;
 950 }