69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
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/*
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* Copyright (C) 2021 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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#ifndef CPP_CAR_BINDER_LIB_LARGEPARCELABLE_INCLUDE_MAPPEDFILE_H_
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#define CPP_CAR_BINDER_LIB_LARGEPARCELABLE_INCLUDE_MAPPEDFILE_H_
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#include <utils/Errors.h>
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#include <sys/mman.h>
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namespace android {
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namespace automotive {
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namespace car_binder_lib {
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using ::android::status_t;
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// MappedFile represents a memory area mapped from a file. This class owns this area and would
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// unmap it during destruction.
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class MappedFile {
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public:
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// Create a new mapped memory area from 'memoryFd' with size 'fileSize'. If 'write' is true, the
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// area would be mapped with read/write permission, otherwise, read only. Caller should use
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// isValid() to check whether the initialization succeed and use getErr() to read err if
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// isValid() is not true.
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MappedFile(int memoryFd, int32_t fileSize, bool writtable);
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inline bool isValid() const { return (mAddr != MAP_FAILED); }
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inline status_t getErr() const { return -mErrno; }
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inline const void* getAddr() const { return mAddr; }
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inline void* getWriteAddr() const {
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assert(!mReadOnly);
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return mAddr;
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}
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inline size_t getSize() const { return mSize; }
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void sync() const;
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~MappedFile();
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private:
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size_t mSize = 0;
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void* mAddr = MAP_FAILED;
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int mErrno = 0;
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bool mReadOnly;
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};
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} // namespace car_binder_lib
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} // namespace automotive
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} // namespace android
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#endif // CPP_CAR_BINDER_LIB_LARGEPARCELABLE_INCLUDE_MAPPEDFILE_H_
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