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121 lines
3.5 KiB
121 lines
3.5 KiB
/*
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* Copyright (C) 2017 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 "HybridInterface"
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#include <utils/Log.h>
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#include <hidl/HybridInterface.h>
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#include <hidl/HidlSupport.h>
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#include <android/hidl/token/1.0/ITokenManager.h>
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namespace android {
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using ::android::hidl::token::V1_0::ITokenManager;
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namespace {
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std::mutex gTokenManagerLock;
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sp<ITokenManager> gTokenManager = nullptr;
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struct TokenManagerDeathRecipient : public hardware::hidl_death_recipient {
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void serviceDied(uint64_t, const wp<HInterface>&) {
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std::lock_guard<std::mutex> lock(gTokenManagerLock);
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gTokenManager = nullptr;
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}
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};
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sp<TokenManagerDeathRecipient> gTokenManagerDeathRecipient =
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new TokenManagerDeathRecipient();
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bool isBadTokenManager() {
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if (gTokenManager != nullptr) {
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return false;
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}
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gTokenManager = ITokenManager::getService();
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if (gTokenManager == nullptr) {
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ALOGE("Cannot retrieve TokenManager.");
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return true;
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}
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auto transaction = gTokenManager->linkToDeath(
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gTokenManagerDeathRecipient, 0);
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if (!transaction.isOk()) {
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ALOGE("Cannot observe TokenManager's death.");
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gTokenManager = nullptr;
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return true;
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}
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return false;
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}
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template <typename ReturnType>
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bool isBadTransaction(hardware::Return<ReturnType>& transaction) {
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if (transaction.isOk()) {
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return false;
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}
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ALOGE("TokenManager's transaction error: %s",
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transaction.description().c_str());
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gTokenManager->unlinkToDeath(gTokenManagerDeathRecipient).isOk();
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gTokenManager = nullptr;
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return true;
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}
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} // unnamed namespace
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sp<HInterface> retrieveHalInterface(const HalToken& token) {
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hardware::Return<sp<HInterface> > transaction(nullptr);
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{
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std::lock_guard<std::mutex> lock(gTokenManagerLock);
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if (isBadTokenManager()) {
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return nullptr;
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}
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transaction = gTokenManager->get(token);
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if (isBadTransaction(transaction)) {
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return nullptr;
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}
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}
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return static_cast<sp<HInterface> >(transaction);
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}
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bool createHalToken(const sp<HInterface>& interface, HalToken* token) {
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hardware::Return<void> transaction;
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{
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std::lock_guard<std::mutex> lock(gTokenManagerLock);
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if (isBadTokenManager()) {
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return false;
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}
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transaction = gTokenManager->createToken(interface, [&](const HalToken &newToken) {
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*token = newToken;
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});
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}
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return !isBadTransaction(transaction);
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}
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bool deleteHalToken(const HalToken& token) {
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hardware::Return<bool> transaction(false);
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{
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std::lock_guard<std::mutex> lock(gTokenManagerLock);
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if (isBadTokenManager()) {
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return false;
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}
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transaction = gTokenManager->unregister(token);
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if (isBadTransaction(transaction)) {
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return false;
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}
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}
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return static_cast<bool>(transaction);
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}
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} // namespace android
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