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/*
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*
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* Embedded Linux library
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*
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* Copyright (C) 2016 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include "util.h"
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#include "hashmap.h"
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#include "idle.h"
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#include "dbus.h"
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#include "dbus-private.h"
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struct _dbus_name_cache {
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struct l_dbus *bus;
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struct l_hashmap *names;
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const struct _dbus_name_ops *driver;
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unsigned int last_watch_id;
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struct l_idle *watch_remove_work;
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};
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struct service_watch {
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l_dbus_watch_func_t connect_func;
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l_dbus_watch_func_t disconnect_func;
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l_dbus_destroy_func_t destroy;
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void *user_data;
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unsigned int id;
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bool removed;
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struct service_watch *next;
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};
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struct name_cache_entry {
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int ref_count;
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char *unique_name;
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struct service_watch *watches;
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};
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struct _dbus_name_cache *_dbus_name_cache_new(struct l_dbus *bus,
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const struct _dbus_name_ops *driver)
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{
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struct _dbus_name_cache *cache;
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cache = l_new(struct _dbus_name_cache, 1);
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cache->bus = bus;
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cache->driver = driver;
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return cache;
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}
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static void service_watch_destroy(void *data)
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{
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struct service_watch *watch = data;
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if (watch->destroy)
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watch->destroy(watch->user_data);
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l_free(watch);
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}
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static void name_cache_entry_destroy(void *data)
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{
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struct name_cache_entry *entry = data;
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struct service_watch *watch;
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while (entry->watches) {
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watch = entry->watches;
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entry->watches = watch->next;
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service_watch_destroy(watch);
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}
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l_free(entry->unique_name);
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l_free(entry);
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}
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void _dbus_name_cache_free(struct _dbus_name_cache *cache)
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{
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if (!cache)
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return;
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if (cache->watch_remove_work)
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l_idle_remove(cache->watch_remove_work);
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l_hashmap_destroy(cache->names, name_cache_entry_destroy);
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l_free(cache);
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}
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bool _dbus_name_cache_add(struct _dbus_name_cache *cache, const char *name)
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{
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struct name_cache_entry *entry;
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if (!_dbus_valid_bus_name(name))
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return false;
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if (!cache->names)
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cache->names = l_hashmap_string_new();
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entry = l_hashmap_lookup(cache->names, name);
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if (!entry) {
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entry = l_new(struct name_cache_entry, 1);
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l_hashmap_insert(cache->names, name, entry);
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cache->driver->get_name_owner(cache->bus, name);
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}
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entry->ref_count++;
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return true;
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}
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bool _dbus_name_cache_remove(struct _dbus_name_cache *cache, const char *name)
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{
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struct name_cache_entry *entry;
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entry = l_hashmap_lookup(cache->names, name);
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if (!entry)
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return false;
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if (--entry->ref_count)
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return true;
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l_hashmap_remove(cache->names, name);
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name_cache_entry_destroy(entry);
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return true;
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}
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const char *_dbus_name_cache_lookup(struct _dbus_name_cache *cache,
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const char *name)
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{
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struct name_cache_entry *entry;
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entry = l_hashmap_lookup(cache->names, name);
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if (!entry)
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return NULL;
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return entry->unique_name;
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}
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void _dbus_name_cache_notify(struct _dbus_name_cache *cache,
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const char *name, const char *owner)
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{
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struct name_cache_entry *entry;
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struct service_watch *watch;
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bool prev_connected, connected;
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if (!cache)
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return;
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entry = l_hashmap_lookup(cache->names, name);
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if (!entry)
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return;
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prev_connected = !!entry->unique_name;
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connected = owner && *owner != '\0';
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l_free(entry->unique_name);
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entry->unique_name = connected ? l_strdup(owner) : NULL;
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/*
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* This check also means we notify all watchers who have a connected
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* callback when we first learn that the service is in fact connected.
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*/
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if (connected == prev_connected)
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return;
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for (watch = entry->watches; watch; watch = watch->next)
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if (connected && watch->connect_func)
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watch->connect_func(cache->bus, watch->user_data);
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else if (!connected && watch->disconnect_func)
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watch->disconnect_func(cache->bus, watch->user_data);
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}
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unsigned int _dbus_name_cache_add_watch(struct _dbus_name_cache *cache,
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const char *name,
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l_dbus_watch_func_t connect_func,
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l_dbus_watch_func_t disconnect_func,
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void *user_data,
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l_dbus_destroy_func_t destroy)
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{
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struct name_cache_entry *entry;
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struct service_watch *watch;
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if (!_dbus_name_cache_add(cache, name))
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return 0;
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watch = l_new(struct service_watch, 1);
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watch->id = ++cache->last_watch_id;
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watch->connect_func = connect_func;
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watch->disconnect_func = disconnect_func;
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watch->user_data = user_data;
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watch->destroy = destroy;
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entry = l_hashmap_lookup(cache->names, name);
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watch->next = entry->watches;
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entry->watches = watch;
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if (entry->unique_name && connect_func)
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watch->connect_func(cache->bus, watch->user_data);
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return watch->id;
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}
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static bool service_watch_remove(const void *key, void *value, void *user_data)
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{
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struct name_cache_entry *entry = value;
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struct service_watch **watch, *tmp;
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for (watch = &entry->watches; *watch;) {
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if (!(*watch)->removed) {
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watch = &(*watch)->next;
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continue;
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}
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tmp = *watch;
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*watch = tmp->next;
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service_watch_destroy(tmp);
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entry->ref_count--;
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}
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if (entry->ref_count)
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return false;
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name_cache_entry_destroy(entry);
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return true;
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}
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static void service_watch_remove_all(struct l_idle *idle, void *user_data)
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{
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struct _dbus_name_cache *cache = user_data;
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l_idle_remove(cache->watch_remove_work);
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cache->watch_remove_work = NULL;
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l_hashmap_foreach_remove(cache->names, service_watch_remove, cache);
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}
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static void service_watch_mark(const void *key, void *value, void *user_data)
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{
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struct name_cache_entry *entry = value;
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struct service_watch *watch;
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unsigned int *id = user_data;
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for (watch = entry->watches; watch; watch = watch->next)
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if (watch->id == *id) {
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watch->removed = true;
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watch->connect_func = NULL;
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watch->disconnect_func = NULL;
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*id = 0;
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break;
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}
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}
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bool _dbus_name_cache_remove_watch(struct _dbus_name_cache *cache,
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unsigned int id)
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{
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l_hashmap_foreach(cache->names, service_watch_mark, &id;;
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if (id)
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return false;
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if (!cache->watch_remove_work)
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cache->watch_remove_work = l_idle_create(
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service_watch_remove_all,
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cache, NULL);
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return true;
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}
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