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87 lines
2.5 KiB
87 lines
2.5 KiB
/* |
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* Copyright (C) 2016 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 "libhidlmemory" |
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#include <map> |
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#include <mutex> |
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#include <string> |
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#include <hidlmemory/mapping.h> |
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#include <android-base/logging.h> |
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#include <android/hidl/memory/1.0/IMapper.h> |
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#include <hidl/HidlSupport.h> |
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#include <log/log.h> |
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using android::sp; |
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using android::hidl::memory::V1_0::IMemory; |
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using android::hidl::memory::V1_0::IMapper; |
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namespace android { |
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namespace hardware { |
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static std::map<std::string, sp<IMapper>> gMappersByName; |
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static std::mutex gMutex; |
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static inline sp<IMapper> getMapperService(const std::string& name) { |
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std::unique_lock<std::mutex> _lock(gMutex); |
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auto iter = gMappersByName.find(name); |
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if (iter != gMappersByName.end()) { |
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return iter->second; |
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} |
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sp<IMapper> mapper = IMapper::getService(name, true /* getStub */); |
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if (mapper != nullptr) { |
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gMappersByName[name] = mapper; |
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} |
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return mapper; |
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} |
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sp<IMemory> mapMemory(const hidl_memory& memory) { |
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sp<IMapper> mapper = getMapperService(memory.name()); |
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if (mapper == nullptr) { |
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LOG(ERROR) << "Could not fetch mapper for " << memory.name() << " shared memory"; |
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return nullptr; |
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} |
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if (mapper->isRemote()) { |
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LOG(ERROR) << "IMapper must be a passthrough service."; |
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return nullptr; |
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} |
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// hidl_memory's size is stored in uint64_t, but mapMemory's mmap will map |
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// size in size_t. If size is over SIZE_MAX, mapMemory could succeed |
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// but the mapped memory's actual size will be smaller than the reported size. |
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if (memory.size() > SIZE_MAX) { |
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LOG(ERROR) << "Cannot map " << memory.size() << " bytes of memory because it is too large."; |
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android_errorWriteLog(0x534e4554, "79376389"); |
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return nullptr; |
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} |
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Return<sp<IMemory>> ret = mapper->mapMemory(memory); |
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if (!ret.isOk()) { |
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LOG(ERROR) << "hidl_memory map returned transport error."; |
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return nullptr; |
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} |
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return ret; |
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} |
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} // namespace hardware |
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} // namespace android
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