зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.0 KiB
C++
77 строки
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ipc_SharedMemoryBasic_android_h
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#define mozilla_ipc_SharedMemoryBasic_android_h
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#include "base/file_descriptor_posix.h"
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#include "SharedMemory.h"
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#ifdef FUZZING
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# include "SharedMemoryFuzzer.h"
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#endif
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//
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// This is a low-level wrapper around platform shared memory. Don't
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// use it directly; use Shmem allocated through IPDL interfaces.
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//
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namespace mozilla {
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namespace ipc {
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class SharedMemoryBasic final
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: public SharedMemoryCommon<base::FileDescriptor> {
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public:
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SharedMemoryBasic();
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virtual bool SetHandle(const Handle& aHandle, OpenRights aRights) override;
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virtual bool Create(size_t aNbytes) override;
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virtual bool Map(size_t nBytes, void* fixed_address = nullptr) override;
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virtual void CloseHandle() override;
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virtual void* memory() const override {
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#ifdef FUZZING
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return SharedMemoryFuzzer::MutateSharedMemory(mMemory, mAllocSize);
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#else
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return mMemory;
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#endif
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}
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virtual SharedMemoryType Type() const override { return TYPE_BASIC; }
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static Handle NULLHandle() { return Handle(); }
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static void* FindFreeAddressSpace(size_t aSize);
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virtual bool IsHandleValid(const Handle& aHandle) const override {
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return aHandle.fd >= 0;
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}
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virtual bool ShareToProcess(base::ProcessId aProcessId,
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Handle* aNewHandle) override;
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private:
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~SharedMemoryBasic();
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void Unmap();
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// The /dev/ashmem fd we allocate.
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int mShmFd;
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// Pointer to mapped region, null if unmapped.
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void* mMemory;
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// Access rights to map an existing region with.
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OpenRights mOpenRights;
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};
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} // namespace ipc
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} // namespace mozilla
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#endif // ifndef mozilla_ipc_SharedMemoryBasic_android_h
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