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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 */
#ifndef mozilla_ipc_AutoTransportDescriptor_h
#define mozilla_ipc_AutoTransportDescriptor_h
#include <utility>
#include "mozilla/ipc/Transport.h"
#include "mozilla/Result.h"
namespace mozilla::ipc {
class AutoTransportDescriptor final {
AutoTransportDescriptor() = default;
explicit AutoTransportDescriptor(TransportDescriptor aTransport)
: mTransport(aTransport), mValid(true) {}
AutoTransportDescriptor(AutoTransportDescriptor&& aOther) noexcept;
AutoTransportDescriptor& operator=(AutoTransportDescriptor&& aOther) noexcept;
static Result<std::pair<AutoTransportDescriptor, AutoTransportDescriptor>,
AutoTransportDescriptor Duplicate() const;
// NOTE: This will consume this transport descriptor, making it invalid.
UniquePtr<Transport> Open(Transport::Mode aMode);
explicit operator bool() const { return mValid; }
friend struct IPC::ParamTraits<AutoTransportDescriptor>;
TransportDescriptor mTransport;
bool mValid = false;
} // namespace mozilla::ipc
namespace IPC {
template <>
struct ParamTraits<mozilla::ipc::AutoTransportDescriptor> {
using paramType = mozilla::ipc::AutoTransportDescriptor;
static void Write(Message* aMsg, paramType&& aParam) {
WriteParam(aMsg, aParam.mValid);
if (aParam.mValid) {
// TransportDescriptor's serialization code takes it by `const T&`,
// however, it actually closes the handles when passed, so we need to mark
// our state as invalid after sending.
WriteParam(aMsg, aParam.mTransport);
aParam.mValid = false;
static bool Read(const Message* aMsg, PickleIterator* aIter,
paramType* aResult) {
bool valid = false;
if (!ReadParam(aMsg, aIter, &valid)) {
return false;
if (!valid) {
*aResult = mozilla::ipc::AutoTransportDescriptor{};
return true;
mozilla::ipc::TransportDescriptor descr;
if (!ReadParam(aMsg, aIter, &descr)) {
return false;
*aResult = mozilla::ipc::AutoTransportDescriptor{descr};
return true;
} // namespace IPC