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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_mach_h
#define mozilla_ipc_SharedMemoryBasic_mach_h
#include "base/file_descriptor_posix.h"
#include "base/process.h"
#include "SharedMemory.h"
#include <mach/port.h>
#include "chrome/common/mach_ipc_mac.h"
#ifdef FUZZING
# include "SharedMemoryFuzzer.h"
#endif
//
// This is a low-level wrapper around platform shared memory. Don't
// use it directly; use Shmem allocated through IPDL interfaces.
//
class MachPortSender;
class ReceivePort;
namespace mozilla {
namespace ipc {
enum {
kGetPortsMsg = 1,
kSharePortsMsg,
kWaitForTexturesMsg,
kUpdateTextureLocksMsg,
kReturnIdMsg,
kReturnWaitForTexturesMsg,
kReturnPortsMsg,
kShutdownMsg,
kCleanupMsg,
};
struct MemoryPorts {
MachPortSender* mSender;
ReceivePort* mReceiver;
MemoryPorts() = default;
MemoryPorts(MachPortSender* sender, ReceivePort* receiver)
: mSender(sender), mReceiver(receiver) {}
};
class SharedMemoryBasic final : public SharedMemoryCommon<mach_port_t> {
public:
static void SetupMachMemory(pid_t pid, ReceivePort* listen_port,
MachPortSender* listen_port_ack,
MachPortSender* send_port,
ReceivePort* send_port_ack, bool pidIsParent);
static void CleanupForPid(pid_t pid);
static void CleanupForPidWithLock(pid_t pid);
static void Shutdown();
static bool SendMachMessage(pid_t pid, MachSendMessage& message,
MachReceiveMessage* response);
SharedMemoryBasic();
virtual bool SetHandle(const 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 CloseHandle() override;
virtual void* memory() const override {
#ifdef FUZZING
return SharedMemoryFuzzer::MutateSharedMemory(mMemory, mAllocSize);
#else
return mMemory;
#endif
}
virtual SharedMemoryType Type() const override { return TYPE_BASIC; }
static Handle NULLHandle() { return Handle(); }
static void* FindFreeAddressSpace(size_t aSize);
virtual bool IsHandleValid(const Handle& aHandle) const override;
virtual bool ShareToProcess(base::ProcessId aProcessId,
Handle* aNewHandle) override;
private:
~SharedMemoryBasic();
void Unmap();
mach_port_t mPort;
// 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_mach_h
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