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