/*
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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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