code.delx.au - pulseaudio/blob - polyp/polyplib-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 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 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 <sys/socket.h>
  32 #include <netdb.h>
  33 #include <unistd.h>
  34 #include <sys/stat.h>
  35 #include <errno.h>
  36 #include <sys/wait.h>
  37
  38 #include "polyplib-internal.h"
  39 #include "polyplib-context.h"
  40 #include "native-common.h"
  41 #include "pdispatch.h"
  42 #include "pstream.h"
  43 #include "dynarray.h"
  44 #include "socket-client.h"
  45 #include "pstream-util.h"
  46 #include "authkey.h"
  47 #include "util.h"
  48 #include "xmalloc.h"
  49 #include "log.h"
  50 #include "client-conf.h"
  51
  52 #define DEFAULT_SERVER "/tmp/polypaudio/native"
  53
  54 static const struct pa_pdispatch_command command_table[PA_COMMAND_MAX] = {
  55     [PA_COMMAND_REQUEST] = { pa_command_request },
  56     [PA_COMMAND_PLAYBACK_STREAM_KILLED] = { pa_command_stream_killed },
  57     [PA_COMMAND_RECORD_STREAM_KILLED] = { pa_command_stream_killed },
  58     [PA_COMMAND_SUBSCRIBE_EVENT] = { pa_command_subscribe_event },
  59 };
  60
  61 struct pa_context *pa_context_new(struct pa_mainloop_api *mainloop, const char *name) {
  62     struct pa_context *c;
  63     assert(mainloop && name);
  64
  65     c = pa_xmalloc(sizeof(struct pa_context));
  66     c->ref = 1;
  67     c->name = pa_xstrdup(name);
  68     c->mainloop = mainloop;
  69     c->client = NULL;
  70     c->pstream = NULL;
  71     c->pdispatch = NULL;
  72     c->playback_streams = pa_dynarray_new();
  73     c->record_streams = pa_dynarray_new();
  74     assert(c->playback_streams && c->record_streams);
  75
  76     PA_LLIST_HEAD_INIT(struct pa_stream, c->streams);
  77     PA_LLIST_HEAD_INIT(struct pa_operation, c->operations);
  78
  79     c->error = PA_ERROR_OK;
  80     c->state = PA_CONTEXT_UNCONNECTED;
  81     c->ctag = 0;
  82
  83     c->state_callback = NULL;
  84     c->state_userdata = NULL;
  85
  86     c->subscribe_callback = NULL;
  87     c->subscribe_userdata = NULL;
  88
  89     c->memblock_stat = pa_memblock_stat_new();
  90     c->local = -1;
  91
  92     pa_check_signal_is_blocked(SIGPIPE);
  93
  94     c->conf = pa_client_conf_new();
  95     pa_client_conf_load(c->conf, NULL);
  96     pa_client_conf_env(c->conf);
  97
  98     return c;
  99 }
 100
 101 static void context_free(struct pa_context *c) {
 102     assert(c);
 103
 104     while (c->operations)
 105         pa_operation_cancel(c->operations);
 106
 107     while (c->streams)
 108         pa_stream_set_state(c->streams, PA_STREAM_TERMINATED);
 109
 110     if (c->client)
 111         pa_socket_client_unref(c->client);
 112     if (c->pdispatch)
 113         pa_pdispatch_unref(c->pdispatch);
 114     if (c->pstream) {
 115         pa_pstream_close(c->pstream);
 116         pa_pstream_unref(c->pstream);
 117     }
 118
 119     if (c->record_streams)
 120         pa_dynarray_free(c->record_streams, NULL, NULL);
 121     if (c->playback_streams)
 122         pa_dynarray_free(c->playback_streams, NULL, NULL);
 123
 124     pa_memblock_stat_unref(c->memblock_stat);
 125
 126     if (c->conf)
 127         pa_client_conf_free(c->conf);
 128
 129     pa_xfree(c->name);
 130     pa_xfree(c);
 131 }
 132
 133 struct pa_context* pa_context_ref(struct pa_context *c) {
 134     assert(c && c->ref >= 1);
 135     c->ref++;
 136     return c;
 137 }
 138
 139 void pa_context_unref(struct pa_context *c) {
 140     assert(c && c->ref >= 1);
 141
 142     if ((--(c->ref)) == 0)
 143         context_free(c);
 144 }
 145
 146 void pa_context_set_state(struct pa_context *c, enum pa_context_state st) {
 147     assert(c);
 148
 149     if (c->state == st)
 150         return;
 151
 152     pa_context_ref(c);
 153
 154     if (st == PA_CONTEXT_FAILED || st == PA_CONTEXT_TERMINATED) {
 155         struct pa_stream *s;
 156
 157         s = c->streams ? pa_stream_ref(c->streams) : NULL;
 158         while (s) {
 159             struct pa_stream *n = s->next ? pa_stream_ref(s->next) : NULL;
 160             pa_stream_set_state(s, st == PA_CONTEXT_FAILED ? PA_STREAM_FAILED : PA_STREAM_TERMINATED);
 161             pa_stream_unref(s);
 162             s = n;
 163         }
 164
 165         if (c->pdispatch)
 166             pa_pdispatch_unref(c->pdispatch);
 167         c->pdispatch = NULL;
 168
 169         if (c->pstream) {
 170             pa_pstream_close(c->pstream);
 171             pa_pstream_unref(c->pstream);
 172         }
 173         c->pstream = NULL;
 174
 175         if (c->client)
 176             pa_socket_client_unref(c->client);
 177         c->client = NULL;
 178     }
 179
 180     c->state = st;
 181     if (c->state_callback)
 182         c->state_callback(c, c->state_userdata);
 183
 184     pa_context_unref(c);
 185 }
 186
 187 void pa_context_fail(struct pa_context *c, int error) {
 188     assert(c);
 189     c->error = error;
 190     pa_context_set_state(c, PA_CONTEXT_FAILED);
 191 }
 192
 193 static void pstream_die_callback(struct pa_pstream *p, void *userdata) {
 194     struct pa_context *c = userdata;
 195     assert(p && c);
 196     pa_context_fail(c, PA_ERROR_CONNECTIONTERMINATED);
 197 }
 198
 199 static void pstream_packet_callback(struct pa_pstream *p, struct pa_packet *packet, void *userdata) {
 200     struct pa_context *c = userdata;
 201     assert(p && packet && c);
 202
 203     pa_context_ref(c);
 204
 205     if (pa_pdispatch_run(c->pdispatch, packet, c) < 0) {
 206         pa_log(__FILE__": invalid packet.\n");
 207         pa_context_fail(c, PA_ERROR_PROTOCOL);
 208     }
 209
 210     pa_context_unref(c);
 211 }
 212
 213 static void pstream_memblock_callback(struct pa_pstream *p, uint32_t channel, uint32_t delta, const struct pa_memchunk *chunk, void *userdata) {
 214     struct pa_context *c = userdata;
 215     struct pa_stream *s;
 216     assert(p && chunk && c && chunk->memblock && chunk->memblock->data);
 217
 218     pa_context_ref(c);
 219
 220     if ((s = pa_dynarray_get(c->record_streams, channel))) {
 221         if (s->read_callback)
 222             s->read_callback(s, (uint8_t*) chunk->memblock->data + chunk->index, chunk->length, s->read_userdata);
 223     }
 224
 225     pa_context_unref(c);
 226 }
 227
 228 int pa_context_handle_error(struct pa_context *c, uint32_t command, struct pa_tagstruct *t) {
 229     assert(c && t);
 230
 231     if (command == PA_COMMAND_ERROR) {
 232         if (pa_tagstruct_getu32(t, &c->error) < 0) {
 233             pa_context_fail(c, PA_ERROR_PROTOCOL);
 234             return -1;
 235
 236         }
 237     } else if (command == PA_COMMAND_TIMEOUT)
 238         c->error = PA_ERROR_TIMEOUT;
 239     else {
 240         pa_context_fail(c, PA_ERROR_PROTOCOL);
 241         return -1;
 242     }
 243
 244     return 0;
 245 }
 246
 247 static void setup_complete_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 248     struct pa_context *c = userdata;
 249     assert(pd && c && (c->state == PA_CONTEXT_AUTHORIZING || c->state == PA_CONTEXT_SETTING_NAME));
 250
 251     pa_context_ref(c);
 252
 253     if (command != PA_COMMAND_REPLY) {
 254
 255         if (pa_context_handle_error(c, command, t) < 0)
 256             pa_context_fail(c, PA_ERROR_PROTOCOL);
 257
 258         pa_context_fail(c, c->error);
 259         goto finish;
 260     }
 261
 262     switch(c->state) {
 263         case PA_CONTEXT_AUTHORIZING: {
 264             struct pa_tagstruct *t;
 265             t = pa_tagstruct_new(NULL, 0);
 266             assert(t);
 267             pa_tagstruct_putu32(t, PA_COMMAND_SET_CLIENT_NAME);
 268             pa_tagstruct_putu32(t, tag = c->ctag++);
 269             pa_tagstruct_puts(t, c->name);
 270             pa_pstream_send_tagstruct(c->pstream, t);
 271             pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c);
 272
 273             pa_context_set_state(c, PA_CONTEXT_SETTING_NAME);
 274             break;
 275         }
 276
 277         case PA_CONTEXT_SETTING_NAME :
 278             pa_context_set_state(c, PA_CONTEXT_READY);
 279             break;
 280
 281         default:
 282             assert(0);
 283     }
 284
 285 finish:
 286     pa_context_unref(c);
 287 }
 288
 289 static void setup_context(struct pa_context *c, struct pa_iochannel *io) {
 290     struct pa_tagstruct *t;
 291     uint32_t tag;
 292     assert(c && io);
 293
 294     pa_context_ref(c);
 295
 296     assert(!c->pstream);
 297     c->pstream = pa_pstream_new(c->mainloop, io, c->memblock_stat);
 298     assert(c->pstream);
 299
 300     pa_pstream_set_die_callback(c->pstream, pstream_die_callback, c);
 301     pa_pstream_set_recieve_packet_callback(c->pstream, pstream_packet_callback, c);
 302     pa_pstream_set_recieve_memblock_callback(c->pstream, pstream_memblock_callback, c);
 303
 304     assert(!c->pdispatch);
 305     c->pdispatch = pa_pdispatch_new(c->mainloop, command_table, PA_COMMAND_MAX);
 306     assert(c->pdispatch);
 307
 308     if (pa_authkey_load_from_home(PA_NATIVE_COOKIE_FILE, c->auth_cookie, sizeof(c->auth_cookie)) < 0) {
 309         pa_context_fail(c, PA_ERROR_AUTHKEY);
 310         goto finish;
 311     }
 312
 313     t = pa_tagstruct_new(NULL, 0);
 314     assert(t);
 315     pa_tagstruct_putu32(t, PA_COMMAND_AUTH);
 316     pa_tagstruct_putu32(t, tag = c->ctag++);
 317     pa_tagstruct_put_arbitrary(t, c->auth_cookie, sizeof(c->auth_cookie));
 318     pa_pstream_send_tagstruct(c->pstream, t);
 319     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, c);
 320
 321     pa_context_set_state(c, PA_CONTEXT_AUTHORIZING);
 322
 323 finish:
 324
 325     pa_context_unref(c);
 326 }
 327
 328 static void on_connection(struct pa_socket_client *client, struct pa_iochannel*io, void *userdata) {
 329     struct pa_context *c = userdata;
 330     assert(client && c && c->state == PA_CONTEXT_CONNECTING);
 331
 332     pa_context_ref(c);
 333
 334     pa_socket_client_unref(client);
 335     c->client = NULL;
 336
 337     if (!io) {
 338         pa_context_fail(c, PA_ERROR_CONNECTIONREFUSED);
 339         goto finish;
 340     }
 341
 342     setup_context(c, io);
 343
 344 finish:
 345     pa_context_unref(c);
 346 }
 347
 348 static struct sockaddr *resolve_server(const char *server, size_t *len) {
 349     struct sockaddr *sa;
 350     struct addrinfo hints, *result = NULL;
 351     char *port, host[256];
 352     assert(server && len);
 353
 354     snprintf(host, sizeof(host), "%s", server);
 355     host[strcspn(host, ":")] = 0;
 356
 357     if ((port = strrchr(server, ':')))
 358         port++;
 359
 360     if (!port)
 361         port = DEFAULT_PORT;
 362
 363     memset(&hints, 0, sizeof(hints));
 364     hints.ai_family = PF_UNSPEC;
 365     hints.ai_socktype = SOCK_STREAM;
 366     hints.ai_protocol = 0;
 367
 368     if (getaddrinfo(host, port, &hints, &result) != 0)
 369         return NULL;
 370     assert(result);
 371
 372     sa = pa_xmalloc(*len = result->ai_addrlen);
 373     memcpy(sa, result->ai_addr, *len);
 374
 375     freeaddrinfo(result);
 376
 377     return sa;
 378 }
 379
 380 static int default_server_is_running(void) {
 381     struct stat st;
 382
 383     if (DEFAULT_SERVER[0] != '/')
 384         return 1;
 385
 386     if (stat(DEFAULT_SERVER, &st) < 0)
 387         return 0;
 388
 389     return 1;
 390 }
 391
 392 static int context_connect_spawn(struct pa_context *c, const struct pa_spawn_api *api) {
 393     pid_t pid;
 394     int status, r;
 395     int fds[2] = { -1, -1} ;
 396     struct pa_iochannel *io;
 397
 398     pa_context_ref(c);
 399
 400     if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
 401         pa_log(__FILE__": socketpair() failed: %s\n", strerror(errno));
 402         pa_context_fail(c, PA_ERROR_INTERNAL);
 403         goto fail;
 404     }
 405
 406     if (api && api->prefork)
 407         api->prefork();
 408
 409     if ((pid = fork()) < 0) {
 410         pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 411         pa_context_fail(c, PA_ERROR_INTERNAL);
 412
 413         if (api && api->postfork)
 414             api->postfork();
 415
 416         goto fail;
 417     } else if (!pid) {
 418         /* Child */
 419
 420         char t[128];
 421         const char *state = NULL;
 422 #define MAX_ARGS 64
 423         char *argv[MAX_ARGS+1];
 424         int n = 0;
 425
 426         close(fds[0]);
 427
 428         if (api && api->atfork)
 429             api->atfork();
 430
 431         snprintf(t, sizeof(t), "%s=1", ENV_AUTOSPAWNED);
 432         putenv(t);
 433
 434         argv[n++] = c->conf->daemon_binary;
 435         argv[n++] = "--daemonize=yes";
 436
 437         snprintf(t, sizeof(t), "-Lmodule-native-protocol-fd fd=%i", fds[1]);
 438         argv[n++] = t;
 439
 440         while (n < MAX_ARGS) {
 441             char *a;
 442
 443             if (!(a = pa_split_spaces(c->conf->extra_arguments, &state)))
 444                 break;
 445
 446             argv[n++] = a;
 447         }
 448
 449         argv[n++] = NULL;
 450
 451         execv(argv[0], argv);
 452         exit(1);
 453     }
 454
 455     /* Parent */
 456
 457     r = waitpid(pid, &status, 0);
 458
 459     if (api && api->postfork)
 460         api->postfork();
 461
 462     if (r < 0) {
 463         pa_log(__FILE__": waitpid() failed: %s\n", strerror(errno));
 464         pa_context_fail(c, PA_ERROR_INTERNAL);
 465         goto fail;
 466     } else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 467         pa_context_fail(c, PA_ERROR_CONNECTIONREFUSED);
 468         goto fail;
 469     }
 470
 471     close(fds[1]);
 472
 473     c->local = 1;
 474
 475     io = pa_iochannel_new(c->mainloop, fds[0], fds[0]);
 476     setup_context(c, io);
 477
 478     pa_context_unref(c);
 479
 480     return 0;
 481
 482 fail:
 483     if (fds[0] != -1)
 484         close(fds[0]);
 485     if (fds[1] != -1)
 486         close(fds[1]);
 487
 488     pa_context_unref(c);
 489
 490     return -1;
 491 }
 492
 493 int pa_context_connect(struct pa_context *c, const char *server, int spawn, const struct pa_spawn_api *api) {
 494     int r = -1;
 495     assert(c && c->ref >= 1 && c->state == PA_CONTEXT_UNCONNECTED);
 496
 497     if (!server)
 498         server = c->conf->default_server;
 499
 500     if (!server && spawn && c->conf->autospawn && !default_server_is_running())
 501         return context_connect_spawn(c, api);
 502
 503     server = DEFAULT_SERVER;
 504
 505     pa_context_ref(c);
 506
 507     assert(!c->client);
 508
 509     if (*server == '/') {
 510         if (!(c->client = pa_socket_client_new_unix(c->mainloop, server))) {
 511             pa_context_fail(c, PA_ERROR_CONNECTIONREFUSED);
 512             goto finish;
 513         }
 514
 515         c->local = 1;
 516     } else {
 517         struct sockaddr* sa;
 518         size_t sa_len;
 519
 520         if (!(sa = resolve_server(server, &sa_len))) {
 521             pa_context_fail(c, PA_ERROR_INVALIDSERVER);
 522             goto finish;
 523         }
 524
 525         c->client = pa_socket_client_new_sockaddr(c->mainloop, sa, sa_len);
 526         pa_xfree(sa);
 527
 528         if (!c->client) {
 529             pa_context_fail(c, PA_ERROR_CONNECTIONREFUSED);
 530             goto finish;
 531         }
 532
 533         c->local = 0;
 534     }
 535
 536     pa_socket_client_set_callback(c->client, on_connection, c);
 537     pa_context_set_state(c, PA_CONTEXT_CONNECTING);
 538
 539     r = 0;
 540
 541 finish:
 542     pa_context_unref(c);
 543
 544     return r;
 545 }
 546
 547 void pa_context_disconnect(struct pa_context *c) {
 548     assert(c);
 549     pa_context_set_state(c, PA_CONTEXT_TERMINATED);
 550 }
 551
 552 enum pa_context_state pa_context_get_state(struct pa_context *c) {
 553     assert(c && c->ref >= 1);
 554     return c->state;
 555 }
 556
 557 int pa_context_errno(struct pa_context *c) {
 558     assert(c && c->ref >= 1);
 559     return c->error;
 560 }
 561
 562 void pa_context_set_state_callback(struct pa_context *c, void (*cb)(struct pa_context *c, void *userdata), void *userdata) {
 563     assert(c && c->ref >= 1);
 564     c->state_callback = cb;
 565     c->state_userdata = userdata;
 566 }
 567
 568 int pa_context_is_pending(struct pa_context *c) {
 569     assert(c && c->ref >= 1);
 570
 571 /*     pa_log("pstream: %i\n", pa_pstream_is_pending(c->pstream)); */
 572 /*     pa_log("pdispatch: %i\n", pa_pdispatch_is_pending(c->pdispatch)); */
 573
 574     return (c->pstream && pa_pstream_is_pending(c->pstream)) || (c->pdispatch && pa_pdispatch_is_pending(c->pdispatch)) || c->client;
 575 }
 576
 577 static void set_dispatch_callbacks(struct pa_operation *o);
 578
 579 static void pdispatch_drain_callback(struct pa_pdispatch*pd, void *userdata) {
 580     set_dispatch_callbacks(userdata);
 581 }
 582
 583 static void pstream_drain_callback(struct pa_pstream *s, void *userdata) {
 584     set_dispatch_callbacks(userdata);
 585 }
 586
 587 static void set_dispatch_callbacks(struct pa_operation *o) {
 588     int done = 1;
 589     assert(o && o->context && o->context->ref >= 1 && o->ref >= 1 && o->context->state == PA_CONTEXT_READY);
 590
 591     pa_pstream_set_drain_callback(o->context->pstream, NULL, NULL);
 592     pa_pdispatch_set_drain_callback(o->context->pdispatch, NULL, NULL);
 593
 594     if (pa_pdispatch_is_pending(o->context->pdispatch)) {
 595         pa_pdispatch_set_drain_callback(o->context->pdispatch, pdispatch_drain_callback, o);
 596         done = 0;
 597     }
 598
 599     if (pa_pstream_is_pending(o->context->pstream)) {
 600         pa_pstream_set_drain_callback(o->context->pstream, pstream_drain_callback, o);
 601         done = 0;
 602     }
 603
 604     if (!done)
 605         pa_operation_ref(o);
 606     else {
 607         if (o->callback) {
 608             void (*cb)(struct pa_context *c, void *userdata);
 609             cb = (void (*)(struct pa_context*, void*)) o->callback;
 610             cb(o->context, o->userdata);
 611         }
 612
 613         pa_operation_done(o);
 614     }
 615
 616     pa_operation_unref(o);
 617 }
 618
 619 struct pa_operation* pa_context_drain(struct pa_context *c, void (*cb) (struct pa_context*c, void *userdata), void *userdata) {
 620     struct pa_operation *o;
 621     assert(c && c->ref >= 1);
 622
 623     if (c->state != PA_CONTEXT_READY)
 624         return NULL;
 625
 626     if (!pa_context_is_pending(c))
 627         return NULL;
 628
 629     o = pa_operation_new(c, NULL);
 630     assert(o);
 631     o->callback = cb;
 632     o->userdata = userdata;
 633
 634     set_dispatch_callbacks(pa_operation_ref(o));
 635
 636     return o;
 637 }
 638
 639 void pa_context_exit_daemon(struct pa_context *c) {
 640     struct pa_tagstruct *t;
 641     assert(c && c->ref >= 1);
 642
 643     t = pa_tagstruct_new(NULL, 0);
 644     assert(t);
 645     pa_tagstruct_putu32(t, PA_COMMAND_EXIT);
 646     pa_tagstruct_putu32(t, c->ctag++);
 647     pa_pstream_send_tagstruct(c->pstream, t);
 648 }
 649
 650 void pa_context_simple_ack_callback(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
 651     struct pa_operation *o = userdata;
 652     int success = 1;
 653     assert(pd && o && o->context && o->ref >= 1);
 654
 655     if (command != PA_COMMAND_REPLY) {
 656         if (pa_context_handle_error(o->context, command, t) < 0)
 657             goto finish;
 658
 659         success = 0;
 660     } else if (!pa_tagstruct_eof(t)) {
 661         pa_context_fail(o->context, PA_ERROR_PROTOCOL);
 662         goto finish;
 663     }
 664
 665     if (o->callback) {
 666         void (*cb)(struct pa_context *c, int success, void *userdata) = o->callback;
 667         cb(o->context, success, o->userdata);
 668     }
 669
 670 finish:
 671     pa_operation_done(o);
 672     pa_operation_unref(o);
 673 }
 674
 675 struct pa_operation* pa_context_send_simple_command(struct pa_context *c, uint32_t command, void (*internal_callback)(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata), void (*cb)(), void *userdata) {
 676     struct pa_tagstruct *t;
 677     struct pa_operation *o;
 678     uint32_t tag;
 679     assert(c && cb);
 680
 681     o = pa_operation_new(c, NULL);
 682     o->callback = cb;
 683     o->userdata = userdata;
 684
 685     t = pa_tagstruct_new(NULL, 0);
 686     pa_tagstruct_putu32(t, command);
 687     pa_tagstruct_putu32(t, tag = c->ctag++);
 688     pa_pstream_send_tagstruct(c->pstream, t);
 689     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, internal_callback, o);
 690
 691     return pa_operation_ref(o);
 692 }
 693
 694 const char* pa_get_library_version(void) {
 695     return PACKAGE_VERSION;
 696 }
 697
 698 struct pa_operation* pa_context_set_default_sink(struct pa_context *c, const char *name, void(*cb)(struct pa_context*c, int success, void *userdata), void *userdata) {
 699     struct pa_tagstruct *t;
 700     struct pa_operation *o;
 701     uint32_t tag;
 702     assert(c && cb);
 703
 704     o = pa_operation_new(c, NULL);
 705     o->callback = cb;
 706     o->userdata = userdata;
 707
 708     t = pa_tagstruct_new(NULL, 0);
 709     pa_tagstruct_putu32(t, PA_COMMAND_SET_DEFAULT_SINK);
 710     pa_tagstruct_putu32(t, tag = c->ctag++);
 711     pa_tagstruct_puts(t, name);
 712     pa_pstream_send_tagstruct(c->pstream, t);
 713     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, o);
 714
 715     return pa_operation_ref(o);
 716 }
 717
 718 struct pa_operation* pa_context_set_default_source(struct pa_context *c, const char *name, void(*cb)(struct pa_context*c, int success,  void *userdata), void *userdata) {
 719     struct pa_tagstruct *t;
 720     struct pa_operation *o;
 721     uint32_t tag;
 722     assert(c && cb);
 723
 724     o = pa_operation_new(c, NULL);
 725     o->callback = cb;
 726     o->userdata = userdata;
 727
 728     t = pa_tagstruct_new(NULL, 0);
 729     pa_tagstruct_putu32(t, PA_COMMAND_SET_DEFAULT_SOURCE);
 730     pa_tagstruct_putu32(t, tag = c->ctag++);
 731     pa_tagstruct_puts(t, name);
 732     pa_pstream_send_tagstruct(c->pstream, t);
 733     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, o);
 734
 735     return pa_operation_ref(o);
 736 }
 737
 738 int pa_context_is_local(struct pa_context *c) {
 739     assert(c);
 740     return c->local;
 741 }
 742
 743 struct pa_operation* pa_context_set_name(struct pa_context *c, const char *name, void(*cb)(struct pa_context*c, int success,  void *userdata), void *userdata) {
 744     struct pa_tagstruct *t;
 745     struct pa_operation *o;
 746     uint32_t tag;
 747     assert(c && name && cb);
 748
 749     o = pa_operation_new(c, NULL);
 750     o->callback = cb;
 751     o->userdata = userdata;
 752
 753     t = pa_tagstruct_new(NULL, 0);
 754     pa_tagstruct_putu32(t, PA_COMMAND_SET_CLIENT_NAME);
 755     pa_tagstruct_putu32(t, tag = c->ctag++);
 756     pa_tagstruct_puts(t, name);
 757     pa_pstream_send_tagstruct(c->pstream, t);
 758     pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT,  pa_context_simple_ack_callback, o);
 759
 760     return pa_operation_ref(o);
 761 }