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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "AshmemMapper.h"
#include <sys/mman.h>
#include "AshmemMemory.h"
namespace android {
namespace hidl {
namespace memory {
namespace V1_0 {
namespace implementation {
// Methods from ::android::hidl::memory::V1_0::IMapper follow.
Return<sp<IMemory>> AshmemMapper::mapMemory(const hidl_memory& mem) {
if (mem.handle()->numFds == 0) {
return nullptr;
}
int fd = mem.handle()->data[0];
void* data = mmap(0, mem.size(), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
// mmap never maps at address zero without MAP_FIXED, so we can avoid
// exposing clients to MAP_FAILED.
return nullptr;
}
return new AshmemMemory(mem, data);
}
} // namespace implementation
} // namespace V1_0
} // namespace memory
} // namespace hidl
} // namespace android
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