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117 lines
3.3 KiB
117 lines
3.3 KiB
4 months ago
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/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "misc"
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#include <utils/misc.h>
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#include <pthread.h>
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#include <utils/Log.h>
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#include <utils/Vector.h>
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#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
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#include <dlfcn.h>
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#include <vndksupport/linker.h>
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#endif
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extern "C" void do_report_sysprop_change();
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using namespace android;
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namespace android {
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struct sysprop_change_callback_info {
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sysprop_change_callback callback;
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int priority;
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};
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#if !defined(_WIN32)
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static pthread_mutex_t gSyspropMutex = PTHREAD_MUTEX_INITIALIZER;
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static Vector<sysprop_change_callback_info>* gSyspropList = nullptr;
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#endif
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#if !defined(_WIN32)
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void add_sysprop_change_callback(sysprop_change_callback cb, int priority) {
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pthread_mutex_lock(&gSyspropMutex);
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if (gSyspropList == nullptr) {
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gSyspropList = new Vector<sysprop_change_callback_info>();
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}
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sysprop_change_callback_info info;
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info.callback = cb;
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info.priority = priority;
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bool added = false;
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for (size_t i=0; i<gSyspropList->size(); i++) {
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if (priority >= gSyspropList->itemAt(i).priority) {
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gSyspropList->insertAt(info, i);
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added = true;
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break;
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}
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}
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if (!added) {
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gSyspropList->add(info);
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}
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pthread_mutex_unlock(&gSyspropMutex);
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}
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#else
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void add_sysprop_change_callback(sysprop_change_callback, int) {}
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#endif
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#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
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void (*get_report_sysprop_change_func())() {
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void (*func)() = nullptr;
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void* handle = android_load_sphal_library("libutils.so", RTLD_NOW);
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if (handle != nullptr) {
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func = reinterpret_cast<decltype(func)>(dlsym(handle, "do_report_sysprop_change"));
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}
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return func;
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}
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#endif
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void report_sysprop_change() {
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do_report_sysprop_change();
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#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
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// libutils.so is double loaded; from the default namespace and from the
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// 'sphal' namespace. Redirect the sysprop change event to the other instance
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// of libutils.so loaded in the 'sphal' namespace so that listeners attached
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// to that instance is also notified with this event.
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static auto func = get_report_sysprop_change_func();
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if (func != nullptr) {
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(*func)();
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}
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#endif
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}
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}; // namespace android
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void do_report_sysprop_change() {
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#if !defined(_WIN32)
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pthread_mutex_lock(&gSyspropMutex);
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Vector<sysprop_change_callback_info> listeners;
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if (gSyspropList != nullptr) {
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listeners = *gSyspropList;
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}
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pthread_mutex_unlock(&gSyspropMutex);
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//ALOGI("Reporting sysprop change to %d listeners", listeners.size());
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for (size_t i=0; i<listeners.size(); i++) {
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listeners[i].callback();
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}
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#endif
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}
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