gdbus/watch.c

   1 /*
   2  *
   3  *  D-Bus helper library
   4  *
   5  *  Copyright (C) 2004-2011  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include <glib.h>
  32 #include <dbus/dbus.h>
  33
  34 #include "gdbus.h"
  35
  36 #define info(fmt...)
  37 #define error(fmt...)
  38 #define debug(fmt...)
  39
  40 static DBusHandlerResult message_filter(DBusConnection *connection,
  41                                         DBusMessage *message, void *user_data);
  42
  43 static guint listener_id = 0;
  44 static GSList *listeners = NULL;
  45
  46 struct service_data {
  47         DBusConnection *conn;
  48         DBusPendingCall *call;
  49         char *name;
  50         const char *owner;
  51         guint id;
  52         struct filter_callback *callback;
  53 };
  54
  55 struct filter_callback {
  56         GDBusWatchFunction conn_func;
  57         GDBusWatchFunction disc_func;
  58         GDBusSignalFunction signal_func;
  59         GDBusDestroyFunction destroy_func;
  60         struct service_data *data;
  61         void *user_data;
  62         guint id;
  63 };
  64
  65 struct filter_data {
  66         DBusConnection *connection;
  67         DBusHandleMessageFunction handle_func;
  68         char *name;
  69         char *owner;
  70         char *path;
  71         char *interface;
  72         char *member;
  73         char *argument;
  74         GSList *callbacks;
  75         GSList *processed;
  76         guint name_watch;
  77         gboolean lock;
  78         gboolean registered;
  79 };
  80
  81 static struct filter_data *filter_data_find_match(DBusConnection *connection,
  82                                                         const char *name,
  83                                                         const char *owner,
  84                                                         const char *path,
  85                                                         const char *interface,
  86                                                         const char *member,
  87                                                         const char *argument)
  88 {
  89         GSList *current;
  90
  91         for (current = listeners;
  92                         current != NULL; current = current->next) {
  93                 struct filter_data *data = current->data;
  94
  95                 if (connection != data->connection)
  96                         continue;
  97
  98                 if (g_strcmp0(name, data->name) != 0)
  99                         continue;
 100
 101                 if (g_strcmp0(owner, data->owner) != 0)
 102                         continue;
 103
 104                 if (g_strcmp0(path, data->path) != 0)
 105                         continue;
 106
 107                 if (g_strcmp0(interface, data->interface) != 0)
 108                         continue;
 109
 110                 if (g_strcmp0(member, data->member) != 0)
 111                         continue;
 112
 113                 if (g_strcmp0(argument, data->argument) != 0)
 114                         continue;
 115
 116                 return data;
 117         }
 118
 119         return NULL;
 120 }
 121
 122 static struct filter_data *filter_data_find(DBusConnection *connection,
 123                                                         const char *name,
 124                                                         const char *owner,
 125                                                         const char *path,
 126                                                         const char *interface,
 127                                                         const char *member,
 128                                                         const char *argument)
 129 {
 130         GSList *current;
 131
 132         for (current = listeners;
 133                         current != NULL; current = current->next) {
 134                 struct filter_data *data = current->data;
 135
 136                 if (connection != data->connection)
 137                         continue;
 138
 139                 if (name && data->name &&
 140                                 g_str_equal(name, data->name) == FALSE)
 141                         continue;
 142
 143                 if (owner && data->owner &&
 144                                 g_str_equal(owner, data->owner) == FALSE)
 145                         continue;
 146
 147                 if (path && data->path &&
 148                                 g_str_equal(path, data->path) == FALSE)
 149                         continue;
 150
 151                 if (interface && data->interface &&
 152                                 g_str_equal(interface, data->interface) == FALSE)
 153                         continue;
 154
 155                 if (member && data->member &&
 156                                 g_str_equal(member, data->member) == FALSE)
 157                         continue;
 158
 159                 if (argument && data->argument &&
 160                                 g_str_equal(argument, data->argument) == FALSE)
 161                         continue;
 162
 163                 return data;
 164         }
 165
 166         return NULL;
 167 }
 168
 169 static void format_rule(struct filter_data *data, char *rule, size_t size)
 170 {
 171         const char *sender;
 172         int offset;
 173
 174         offset = snprintf(rule, size, "type='signal'");
 175         sender = data->name ? : data->owner;
 176
 177         if (sender)
 178                 offset += snprintf(rule + offset, size - offset,
 179                                 ",sender='%s'", sender);
 180         if (data->path)
 181                 offset += snprintf(rule + offset, size - offset,
 182                                 ",path='%s'", data->path);
 183         if (data->interface)
 184                 offset += snprintf(rule + offset, size - offset,
 185                                 ",interface='%s'", data->interface);
 186         if (data->member)
 187                 offset += snprintf(rule + offset, size - offset,
 188                                 ",member='%s'", data->member);
 189         if (data->argument)
 190                 snprintf(rule + offset, size - offset,
 191                                 ",arg0='%s'", data->argument);
 192 }
 193
 194 static gboolean add_match(struct filter_data *data,
 195                                 DBusHandleMessageFunction filter)
 196 {
 197         DBusError err;
 198         char rule[DBUS_MAXIMUM_MATCH_RULE_LENGTH];
 199
 200         format_rule(data, rule, sizeof(rule));
 201         dbus_error_init(&err);
 202
 203         dbus_bus_add_match(data->connection, rule, &err);
 204         if (dbus_error_is_set(&err)) {
 205                 error("Adding match rule \"%s\" failed: %s", rule,
 206                                 err.message);
 207                 dbus_error_free(&err);
 208                 return FALSE;
 209         }
 210
 211         data->handle_func = filter;
 212         data->registered = TRUE;
 213
 214         return TRUE;
 215 }
 216
 217 static gboolean remove_match(struct filter_data *data)
 218 {
 219         DBusError err;
 220         char rule[DBUS_MAXIMUM_MATCH_RULE_LENGTH];
 221
 222         format_rule(data, rule, sizeof(rule));
 223
 224         dbus_error_init(&err);
 225
 226         dbus_bus_remove_match(data->connection, rule, &err);
 227         if (dbus_error_is_set(&err)) {
 228                 error("Removing owner match rule for %s failed: %s",
 229                                 rule, err.message);
 230                 dbus_error_free(&err);
 231                 return FALSE;
 232         }
 233
 234         return TRUE;
 235 }
 236
 237 static struct filter_data *filter_data_get(DBusConnection *connection,
 238                                         DBusHandleMessageFunction filter,
 239                                         const char *sender,
 240                                         const char *path,
 241                                         const char *interface,
 242                                         const char *member,
 243                                         const char *argument)
 244 {
 245         struct filter_data *data;
 246         const char *name = NULL, *owner = NULL;
 247
 248         if (filter_data_find(connection, NULL, NULL, NULL, NULL, NULL, NULL) == NULL) {
 249                 if (!dbus_connection_add_filter(connection,
 250                                         message_filter, NULL, NULL)) {
 251                         error("dbus_connection_add_filter() failed");
 252                         return NULL;
 253                 }
 254         }
 255
 256         if (sender == NULL)
 257                 goto proceed;
 258
 259         if (sender[0] == ':')
 260                 owner = sender;
 261         else
 262                 name = sender;
 263
 264 proceed:
 265         data = filter_data_find_match(connection, name, owner, path,
 266                                                 interface, member, argument);
 267         if (data)
 268                 return data;
 269
 270         data = g_new0(struct filter_data, 1);
 271
 272         data->connection = dbus_connection_ref(connection);
 273         data->name = name ? g_strdup(name) : NULL;
 274         data->owner = owner ? g_strdup(owner) : NULL;
 275         data->path = g_strdup(path);
 276         data->interface = g_strdup(interface);
 277         data->member = g_strdup(member);
 278         data->argument = g_strdup(argument);
 279
 280         if (!add_match(data, filter)) {
 281                 g_free(data);
 282                 return NULL;
 283         }
 284
 285         listeners = g_slist_append(listeners, data);
 286
 287         return data;
 288 }
 289
 290 static struct filter_callback *filter_data_find_callback(
 291                                                 struct filter_data *data,
 292                                                 guint id)
 293 {
 294         GSList *l;
 295
 296         for (l = data->callbacks; l; l = l->next) {
 297                 struct filter_callback *cb = l->data;
 298                 if (cb->id == id)
 299                         return cb;
 300         }
 301         for (l = data->processed; l; l = l->next) {
 302                 struct filter_callback *cb = l->data;
 303                 if (cb->id == id)
 304                         return cb;
 305         }
 306
 307         return NULL;
 308 }
 309
 310 static void filter_data_free(struct filter_data *data)
 311 {
 312         GSList *l;
 313
 314         for (l = data->callbacks; l != NULL; l = l->next)
 315                 g_free(l->data);
 316
 317         g_slist_free(data->callbacks);
 318         g_dbus_remove_watch(data->connection, data->name_watch);
 319         g_free(data->name);
 320         g_free(data->owner);
 321         g_free(data->path);
 322         g_free(data->interface);
 323         g_free(data->member);
 324         g_free(data->argument);
 325         dbus_connection_unref(data->connection);
 326         g_free(data);
 327 }
 328
 329 static void filter_data_call_and_free(struct filter_data *data)
 330 {
 331         GSList *l;
 332
 333         for (l = data->callbacks; l != NULL; l = l->next) {
 334                 struct filter_callback *cb = l->data;
 335                 if (cb->disc_func)
 336                         cb->disc_func(data->connection, cb->user_data);
 337                 if (cb->destroy_func)
 338                         cb->destroy_func(cb->user_data);
 339                 g_free(cb);
 340         }
 341
 342         filter_data_free(data);
 343 }
 344
 345 static struct filter_callback *filter_data_add_callback(
 346                                                 struct filter_data *data,
 347                                                 GDBusWatchFunction connect,
 348                                                 GDBusWatchFunction disconnect,
 349                                                 GDBusSignalFunction signal,
 350                                                 GDBusDestroyFunction destroy,
 351                                                 void *user_data)
 352 {
 353         struct filter_callback *cb = NULL;
 354
 355         cb = g_new0(struct filter_callback, 1);
 356
 357         cb->conn_func = connect;
 358         cb->disc_func = disconnect;
 359         cb->signal_func = signal;
 360         cb->destroy_func = destroy;
 361         cb->user_data = user_data;
 362         cb->id = ++listener_id;
 363
 364         if (data->lock)
 365                 data->processed = g_slist_append(data->processed, cb);
 366         else
 367                 data->callbacks = g_slist_append(data->callbacks, cb);
 368
 369         return cb;
 370 }
 371
 372 static void service_data_free(struct service_data *data)
 373 {
 374         struct filter_callback *callback = data->callback;
 375
 376         dbus_connection_unref(data->conn);
 377
 378         if (data->call)
 379                 dbus_pending_call_unref(data->call);
 380
 381         if (data->id)
 382                 g_source_remove(data->id);
 383
 384         g_free(data->name);
 385         g_free(data);
 386
 387         callback->data = NULL;
 388 }
 389
 390 static gboolean filter_data_remove_callback(struct filter_data *data,
 391                                                 struct filter_callback *cb)
 392 {
 393         DBusConnection *connection;
 394
 395         data->callbacks = g_slist_remove(data->callbacks, cb);
 396         data->processed = g_slist_remove(data->processed, cb);
 397
 398         /* Cancel pending operations */
 399         if (cb->data) {
 400                 if (cb->data->call)
 401                         dbus_pending_call_cancel(cb->data->call);
 402                 service_data_free(cb->data);
 403         }
 404
 405         if (cb->destroy_func)
 406                 cb->destroy_func(cb->user_data);
 407
 408         g_free(cb);
 409
 410         /* Don't remove the filter if other callbacks exist or data is lock
 411          * processing callbacks */
 412         if (data->callbacks || data->lock)
 413                 return TRUE;
 414
 415         if (data->registered && !remove_match(data))
 416                 return FALSE;
 417
 418         connection = dbus_connection_ref(data->connection);
 419         listeners = g_slist_remove(listeners, data);
 420
 421         /* Remove filter if there are no listeners left for the connection */
 422         if (filter_data_find(connection, NULL, NULL, NULL, NULL, NULL,
 423                                                                 NULL) == NULL)
 424                 dbus_connection_remove_filter(connection, message_filter,
 425                                                 NULL);
 426
 427         filter_data_free(data);
 428         dbus_connection_unref(connection);
 429
 430         return TRUE;
 431 }
 432
 433 static DBusHandlerResult signal_filter(DBusConnection *connection,
 434                                         DBusMessage *message, void *user_data)
 435 {
 436         struct filter_data *data = user_data;
 437         struct filter_callback *cb;
 438
 439         while (data->callbacks) {
 440                 cb = data->callbacks->data;
 441
 442                 if (cb->signal_func && !cb->signal_func(connection, message,
 443                                                         cb->user_data)) {
 444                         filter_data_remove_callback(data, cb);
 445                         continue;
 446                 }
 447
 448                 /* Check if the watch was removed/freed by the callback
 449                  * function */
 450                 if (!g_slist_find(data->callbacks, cb))
 451                         continue;
 452
 453                 data->callbacks = g_slist_remove(data->callbacks, cb);
 454                 data->processed = g_slist_append(data->processed, cb);
 455         }
 456
 457         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 458 }
 459
 460 static void update_name_cache(const char *name, const char *owner)
 461 {
 462         GSList *l;
 463
 464         for (l = listeners; l != NULL; l = l->next) {
 465                 struct filter_data *data = l->data;
 466
 467                 if (g_strcmp0(data->name, name) != 0)
 468                         continue;
 469
 470                 g_free(data->owner);
 471                 data->owner = g_strdup(owner);
 472         }
 473 }
 474
 475 static const char *check_name_cache(const char *name)
 476 {
 477         GSList *l;
 478
 479         for (l = listeners; l != NULL; l = l->next) {
 480                 struct filter_data *data = l->data;
 481
 482                 if (g_strcmp0(data->name, name) != 0)
 483                         continue;
 484
 485                 return data->owner;
 486         }
 487
 488         return NULL;
 489 }
 490
 491 static DBusHandlerResult service_filter(DBusConnection *connection,
 492                                         DBusMessage *message, void *user_data)
 493 {
 494         struct filter_data *data = user_data;
 495         struct filter_callback *cb;
 496         char *name, *old, *new;
 497
 498         if (!dbus_message_get_args(message, NULL,
 499                                 DBUS_TYPE_STRING, &name,
 500                                 DBUS_TYPE_STRING, &old,
 501                                 DBUS_TYPE_STRING, &new,
 502                                 DBUS_TYPE_INVALID)) {
 503                 error("Invalid arguments for NameOwnerChanged signal");
 504                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 505         }
 506
 507         update_name_cache(name, new);
 508
 509         while (data->callbacks) {
 510                 cb = data->callbacks->data;
 511
 512                 if (*new == '\0') {
 513                         if (cb->disc_func)
 514                                 cb->disc_func(connection, cb->user_data);
 515                 } else {
 516                         if (cb->conn_func)
 517                                 cb->conn_func(connection, cb->user_data);
 518                 }
 519
 520                 /* Check if the watch was removed/freed by the callback
 521                  * function */
 522                 if (!g_slist_find(data->callbacks, cb))
 523                         continue;
 524
 525                 /* Only auto remove if it is a bus name watch */
 526                 if (data->argument[0] == ':' &&
 527                                 (cb->conn_func == NULL || cb->disc_func == NULL)) {
 528                         filter_data_remove_callback(data, cb);
 529                         continue;
 530                 }
 531
 532                 data->callbacks = g_slist_remove(data->callbacks, cb);
 533                 data->processed = g_slist_append(data->processed, cb);
 534         }
 535
 536         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 537 }
 538
 539
 540 static DBusHandlerResult message_filter(DBusConnection *connection,
 541                                         DBusMessage *message, void *user_data)
 542 {
 543         struct filter_data *data;
 544         const char *sender, *path, *iface, *member, *arg = NULL;
 545         GSList *current, *delete_listener = NULL;
 546
 547         /* Only filter signals */
 548         if (dbus_message_get_type(message) != DBUS_MESSAGE_TYPE_SIGNAL)
 549                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 550
 551         sender = dbus_message_get_sender(message);
 552         path = dbus_message_get_path(message);
 553         iface = dbus_message_get_interface(message);
 554         member = dbus_message_get_member(message);
 555         dbus_message_get_args(message, NULL, DBUS_TYPE_STRING, &arg, DBUS_TYPE_INVALID);
 556
 557         /* Sender is always the owner */
 558
 559         for (current = listeners; current != NULL; current = current->next) {
 560                 data = current->data;
 561
 562                 if (connection != data->connection)
 563                         continue;
 564
 565                 if (data->owner && g_str_equal(sender, data->owner) == FALSE)
 566                         continue;
 567
 568                 if (data->path && g_str_equal(path, data->path) == FALSE)
 569                         continue;
 570
 571                 if (data->interface && g_str_equal(iface,
 572                                                 data->interface) == FALSE)
 573                         continue;
 574
 575                 if (data->member && g_str_equal(member, data->member) == FALSE)
 576                         continue;
 577
 578                 if (data->argument && g_str_equal(arg,
 579                                                 data->argument) == FALSE)
 580                         continue;
 581
 582                 if (data->handle_func) {
 583                         data->lock = TRUE;
 584
 585                         data->handle_func(connection, message, data);
 586
 587                         data->callbacks = data->processed;
 588                         data->processed = NULL;
 589                         data->lock = FALSE;
 590                 }
 591
 592                 if (!data->callbacks)
 593                         delete_listener = g_slist_prepend(delete_listener,
 594                                                                 current);
 595         }
 596
 597         for (current = delete_listener; current != NULL;
 598                                         current = delete_listener->next) {
 599                 GSList *l = current->data;
 600
 601                 data = l->data;
 602
 603                 /* Has any other callback added callbacks back to this data? */
 604                 if (data->callbacks != NULL)
 605                         continue;
 606
 607                 remove_match(data);
 608                 listeners = g_slist_remove_link(listeners, l);
 609
 610                 filter_data_free(data);
 611         }
 612
 613         g_slist_free(delete_listener);
 614
 615         /* Remove filter if there are no listeners left for the connection */
 616         if (filter_data_find(connection, NULL, NULL, NULL, NULL, NULL,
 617                                                                 NULL) == NULL)
 618                 dbus_connection_remove_filter(connection, message_filter,
 619                                                 NULL);
 620
 621         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 622 }
 623
 624 static gboolean update_service(void *user_data)
 625 {
 626         struct service_data *data = user_data;
 627         struct filter_callback *cb = data->callback;
 628
 629         update_name_cache(data->name, data->owner);
 630         if (cb->conn_func)
 631                 cb->conn_func(data->conn, cb->user_data);
 632
 633         service_data_free(data);
 634
 635         return FALSE;
 636 }
 637
 638 static void service_reply(DBusPendingCall *call, void *user_data)
 639 {
 640         struct service_data *data = user_data;
 641         DBusMessage *reply;
 642         DBusError err;
 643
 644         reply = dbus_pending_call_steal_reply(call);
 645         if (reply == NULL)
 646                 return;
 647
 648         dbus_error_init(&err);
 649
 650         if (dbus_set_error_from_message(&err, reply))
 651                 goto fail;
 652
 653         if (dbus_message_get_args(reply, &err,
 654                                         DBUS_TYPE_STRING, &data->owner,
 655                                                 DBUS_TYPE_INVALID) == FALSE)
 656                 goto fail;
 657
 658         update_service(data);
 659
 660         goto done;
 661
 662 fail:
 663         error("%s", err.message);
 664         dbus_error_free(&err);
 665         service_data_free(data);
 666 done:
 667         dbus_message_unref(reply);
 668 }
 669
 670 static void check_service(DBusConnection *connection,
 671                                         const char *name,
 672                                         struct filter_callback *callback)
 673 {
 674         DBusMessage *message;
 675         struct service_data *data;
 676
 677         data = g_try_malloc0(sizeof(*data));
 678         if (data == NULL) {
 679                 error("Can't allocate data structure");
 680                 return;
 681         }
 682
 683         data->conn = dbus_connection_ref(connection);
 684         data->name = g_strdup(name);
 685         data->callback = callback;
 686         callback->data = data;
 687
 688         data->owner = check_name_cache(name);
 689         if (data->owner != NULL) {
 690                 data->id = g_idle_add(update_service, data);
 691                 return;
 692         }
 693
 694         message = dbus_message_new_method_call(DBUS_SERVICE_DBUS,
 695                         DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "GetNameOwner");
 696         if (message == NULL) {
 697                 error("Can't allocate new message");
 698                 g_free(data);
 699                 return;
 700         }
 701
 702         dbus_message_append_args(message, DBUS_TYPE_STRING, &name,
 703                                                         DBUS_TYPE_INVALID);
 704
 705         if (dbus_connection_send_with_reply(connection, message,
 706                                                         &data->call, -1) == FALSE) {
 707                 error("Failed to execute method call");
 708                 g_free(data);
 709                 goto done;
 710         }
 711
 712         if (data->call == NULL) {
 713                 error("D-Bus connection not available");
 714                 g_free(data);
 715                 goto done;
 716         }
 717
 718         dbus_pending_call_set_notify(data->call, service_reply, data, NULL);
 719
 720 done:
 721         dbus_message_unref(message);
 722 }
 723
 724 guint g_dbus_add_service_watch(DBusConnection *connection, const char *name,
 725                                 GDBusWatchFunction connect,
 726                                 GDBusWatchFunction disconnect,
 727                                 void *user_data, GDBusDestroyFunction destroy)
 728 {
 729         struct filter_data *data;
 730         struct filter_callback *cb;
 731
 732         if (name == NULL)
 733                 return 0;
 734
 735         data = filter_data_get(connection, service_filter, NULL, NULL,
 736                                 DBUS_INTERFACE_DBUS, "NameOwnerChanged",
 737                                 name);
 738         if (data == NULL)
 739                 return 0;
 740
 741         cb = filter_data_add_callback(data, connect, disconnect, NULL, destroy,
 742                                         user_data);
 743         if (cb == NULL)
 744                 return 0;
 745
 746         if (connect)
 747                 check_service(connection, name, cb);
 748
 749         return cb->id;
 750 }
 751
 752 guint g_dbus_add_disconnect_watch(DBusConnection *connection, const char *name,
 753                                 GDBusWatchFunction func,
 754                                 void *user_data, GDBusDestroyFunction destroy)
 755 {
 756         return g_dbus_add_service_watch(connection, name, NULL, func,
 757                                                         user_data, destroy);
 758 }
 759
 760 guint g_dbus_add_signal_watch(DBusConnection *connection,
 761                                 const char *sender, const char *path,
 762                                 const char *interface, const char *member,
 763                                 GDBusSignalFunction function, void *user_data,
 764                                 GDBusDestroyFunction destroy)
 765 {
 766         struct filter_data *data;
 767         struct filter_callback *cb;
 768
 769         data = filter_data_get(connection, signal_filter, sender, path,
 770                                 interface, member, NULL);
 771         if (data == NULL)
 772                 return 0;
 773
 774         cb = filter_data_add_callback(data, NULL, NULL, function, destroy,
 775                                         user_data);
 776         if (cb == NULL)
 777                 return 0;
 778
 779         if (data->name != NULL && data->name_watch == 0)
 780                 data->name_watch = g_dbus_add_service_watch(connection,
 781                                                         data->name, NULL,
 782                                                         NULL, NULL, NULL);
 783
 784         return cb->id;
 785 }
 786
 787 gboolean g_dbus_remove_watch(DBusConnection *connection, guint id)
 788 {
 789         struct filter_data *data;
 790         struct filter_callback *cb;
 791         GSList *ldata;
 792
 793         if (id == 0)
 794                 return FALSE;
 795
 796         for (ldata = listeners; ldata; ldata = ldata->next) {
 797                 data = ldata->data;
 798
 799                 cb = filter_data_find_callback(data, id);
 800                 if (cb) {
 801                         filter_data_remove_callback(data, cb);
 802                         return TRUE;
 803                 }
 804         }
 805
 806         return FALSE;
 807 }
 808
 809 void g_dbus_remove_all_watches(DBusConnection *connection)
 810 {
 811         struct filter_data *data;
 812
 813         while ((data = filter_data_find(connection, NULL, NULL, NULL, NULL,
 814                                         NULL, NULL))) {
 815                 listeners = g_slist_remove(listeners, data);
 816                 filter_data_call_and_free(data);
 817         }
 818
 819         dbus_connection_remove_filter(connection, message_filter, NULL);
 820 }