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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 https://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ipc_DataPipe_h
#define mozilla_ipc_DataPipe_h
#include "mozilla/ipc/SharedMemoryBasic.h"
#include "mozilla/ipc/NodeController.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsIIPCSerializableInputStream.h"
#include "nsISupports.h"
namespace mozilla {
namespace ipc {
namespace data_pipe_detail {
class DataPipeAutoLock;
class DataPipeLink;
class DataPipeBase {
public:
DataPipeBase(const DataPipeBase&) = delete;
DataPipeBase& operator=(const DataPipeBase&) = delete;
protected:
explicit DataPipeBase(bool aReceiverSide, nsresult aError);
DataPipeBase(bool aReceiverSide, ScopedPort aPort, SharedMemory* aShmem,
uint32_t aCapacity, nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable);
void CloseInternal(DataPipeAutoLock&, nsresult aStatus) MOZ_REQUIRES(*mMutex);
void AsyncWaitInternal(already_AddRefed<nsIRunnable> aCallback,
already_AddRefed<nsIEventTarget> aTarget,
bool aClosureOnly) MOZ_EXCLUDES(*mMutex);
// Like `nsWriteSegmentFun` or `nsReadSegmentFun`.
using ProcessSegmentFun =
FunctionRef<nsresult(Span<char> aSpan, uint32_t aProcessedThisCall,
uint32_t* aProcessedCount)>;
nsresult ProcessSegmentsInternal(uint32_t aCount,
ProcessSegmentFun aProcessSegment,
uint32_t* aProcessedCount)
MOZ_EXCLUDES(*mMutex);
nsresult CheckStatus(DataPipeAutoLock&) MOZ_REQUIRES(*mMutex);
nsCString Describe(DataPipeAutoLock&) MOZ_REQUIRES(*mMutex);
// Thread safety helper to tell the analysis that `mLink->mMutex` is held when
// `mMutex` is held.
void AssertSameMutex(const std::shared_ptr<Mutex>& aMutex)
MOZ_REQUIRES(*mMutex) MOZ_ASSERT_CAPABILITY(*aMutex) {
MOZ_ASSERT(mMutex == aMutex);
}
virtual ~DataPipeBase();
const std::shared_ptr<Mutex> mMutex;
nsresult mStatus MOZ_GUARDED_BY(*mMutex) = NS_OK;
RefPtr<DataPipeLink> mLink MOZ_GUARDED_BY(*mMutex);
};
template <typename T>
void DataPipeWrite(IPC::MessageWriter* aWriter, T* aParam);
template <typename T>
bool DataPipeRead(IPC::MessageReader* aReader, RefPtr<T>* aResult);
} // namespace data_pipe_detail
class DataPipeSender;
class DataPipeReceiver;
#define NS_DATAPIPESENDER_IID \
{ \
0x6698ed77, 0x9fff, 0x425d, { \
0xb0, 0xa6, 0x1d, 0x30, 0x66, 0xee, 0xb8, 0x16 \
} \
}
// Helper class for streaming data to another process.
class DataPipeSender final : public nsIAsyncOutputStream,
public data_pipe_detail::DataPipeBase {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DATAPIPESENDER_IID)
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOUTPUTSTREAM
NS_DECL_NSIASYNCOUTPUTSTREAM
private:
friend nsresult NewDataPipe(uint32_t, DataPipeSender**, DataPipeReceiver**);
friend void data_pipe_detail::DataPipeWrite<DataPipeSender>(
IPC::MessageWriter* aWriter, DataPipeSender* aParam);
friend bool data_pipe_detail::DataPipeRead<DataPipeSender>(
IPC::MessageReader* aReader, RefPtr<DataPipeSender>* aResult);
explicit DataPipeSender(nsresult aError)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ false, aError) {}
DataPipeSender(ScopedPort aPort, SharedMemory* aShmem, uint32_t aCapacity,
nsresult aPeerStatus, uint32_t aOffset, uint32_t aAvailable)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ false,
std::move(aPort), aShmem, aCapacity,
aPeerStatus, aOffset, aAvailable) {}
~DataPipeSender() = default;
};
NS_DEFINE_STATIC_IID_ACCESSOR(DataPipeSender, NS_DATAPIPESENDER_IID)
#define NS_DATAPIPERECEIVER_IID \
{ \
0x0a185f83, 0x499e, 0x450c, { \
0x95, 0x82, 0x27, 0x67, 0xad, 0x6d, 0x64, 0xb5 \
} \
}
// Helper class for streaming data from another process.
class DataPipeReceiver final : public nsIAsyncInputStream,
public nsIIPCSerializableInputStream,
public data_pipe_detail::DataPipeBase {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DATAPIPERECEIVER_IID)
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
private:
friend nsresult NewDataPipe(uint32_t, DataPipeSender**, DataPipeReceiver**);
friend void data_pipe_detail::DataPipeWrite<DataPipeReceiver>(
IPC::MessageWriter* aWriter, DataPipeReceiver* aParam);
friend bool data_pipe_detail::DataPipeRead<DataPipeReceiver>(
IPC::MessageReader* aReader, RefPtr<DataPipeReceiver>* aResult);
explicit DataPipeReceiver(nsresult aError)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ true, aError) {}
DataPipeReceiver(ScopedPort aPort, SharedMemory* aShmem, uint32_t aCapacity,
nsresult aPeerStatus, uint32_t aOffset, uint32_t aAvailable)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ true,
std::move(aPort), aShmem, aCapacity,
aPeerStatus, aOffset, aAvailable) {}
~DataPipeReceiver() = default;
};
NS_DEFINE_STATIC_IID_ACCESSOR(DataPipeReceiver, NS_DATAPIPERECEIVER_IID)
constexpr uint32_t kDefaultDataPipeCapacity = 64 * 1024;
/**
* Create a new DataPipe pair. The sender and receiver ends of the pipe may be
* used to transfer data between processes. |aCapacity| is the capacity of the
* underlying ring buffer. If `0` is passed, `kDefaultDataPipeCapacity` will be
* used.
*/
nsresult NewDataPipe(uint32_t aCapacity, DataPipeSender** aSender,
DataPipeReceiver** aReceiver);
} // namespace ipc
} // namespace mozilla
namespace IPC {
template <>
struct ParamTraits<mozilla::ipc::DataPipeSender*> {
static void Write(MessageWriter* aWriter,
mozilla::ipc::DataPipeSender* aParam);
static bool Read(MessageReader* aReader,
RefPtr<mozilla::ipc::DataPipeSender>* aResult);
};
template <>
struct ParamTraits<mozilla::ipc::DataPipeReceiver*> {
static void Write(MessageWriter* aWriter,
mozilla::ipc::DataPipeReceiver* aParam);
static bool Read(MessageReader* aReader,
RefPtr<mozilla::ipc::DataPipeReceiver>* aResult);
};
} // namespace IPC
#endif // mozilla_ipc_DataPipe_h
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