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104 lines
2.9 KiB
104 lines
2.9 KiB
6 years ago
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/*
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* Copyright (C) 2008 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 ANDROID_MEMORY_HEAP_BASE_H
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#define ANDROID_MEMORY_HEAP_BASE_H
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#include <stdlib.h>
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#include <stdint.h>
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#include <binder/IMemory.h>
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namespace android {
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// ---------------------------------------------------------------------------
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class MemoryHeapBase : public virtual BnMemoryHeap
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{
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public:
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enum {
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READ_ONLY = IMemoryHeap::READ_ONLY,
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// memory won't be mapped locally, but will be mapped in the remote
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// process.
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DONT_MAP_LOCALLY = 0x00000100,
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NO_CACHING = 0x00000200
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};
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/*
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* maps the memory referenced by fd. but DOESN'T take ownership
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* of the filedescriptor (it makes a copy with dup()
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*/
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MemoryHeapBase(int fd, size_t size, uint32_t flags = 0, uint32_t offset = 0);
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/*
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* maps memory from the given device
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*/
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MemoryHeapBase(const char* device, size_t size = 0, uint32_t flags = 0);
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/*
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* maps memory from ashmem, with the given name for debugging
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*/
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MemoryHeapBase(size_t size, uint32_t flags = 0, char const* name = NULL);
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virtual ~MemoryHeapBase();
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/* implement IMemoryHeap interface */
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virtual int getHeapID() const;
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/* virtual address of the heap. returns MAP_FAILED in case of error */
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virtual void* getBase() const;
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virtual size_t getSize() const;
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virtual uint32_t getFlags() const;
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virtual uint32_t getOffset() const;
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const char* getDevice() const;
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/* this closes this heap -- use carefully */
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void dispose();
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/* this is only needed as a workaround, use only if you know
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* what you are doing */
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status_t setDevice(const char* device) {
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if (mDevice == 0)
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mDevice = device;
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return mDevice ? NO_ERROR : ALREADY_EXISTS;
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}
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protected:
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MemoryHeapBase();
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// init() takes ownership of fd
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status_t init(int fd, void *base, int size,
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int flags = 0, const char* device = NULL);
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private:
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status_t mapfd(int fd, size_t size, uint32_t offset = 0);
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int mFD;
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size_t mSize;
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void* mBase;
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uint32_t mFlags;
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const char* mDevice;
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bool mNeedUnmap;
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uint32_t mOffset;
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};
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_MEMORY_HEAP_BASE_H
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