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diff --git a/ipc/glue/Transport_win.h b/ipc/glue/Transport_win.h
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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_Transport_win_h
+#define mozilla_ipc_Transport_win_h 1
+
+#include <string>
+
+#include "base/process.h"
+#include "ipc/IPCMessageUtils.h"
+#include "nsWindowsHelpers.h"
+
+namespace mozilla {
+namespace ipc {
+
+struct TransportDescriptor
+{
+ std::wstring mPipeName;
+ HANDLE mServerPipeHandle;
+ base::ProcessId mDestinationProcessId;
+};
+
+HANDLE
+TransferHandleToProcess(HANDLE source, base::ProcessId pid);
+
+} // namespace ipc
+} // namespace mozilla
+
+
+namespace IPC {
+
+template<>
+struct ParamTraits<mozilla::ipc::TransportDescriptor>
+{
+ typedef mozilla::ipc::TransportDescriptor paramType;
+ static void Write(Message* aMsg, const paramType& aParam)
+ {
+ HANDLE pipe = mozilla::ipc::TransferHandleToProcess(aParam.mServerPipeHandle,
+ aParam.mDestinationProcessId);
+ DWORD duplicateFromProcessId = 0;
+ if (!pipe) {
+ if (XRE_IsParentProcess()) {
+ // If we are the parent and failed to transfer then there is no hope,
+ // just close the handle.
+ ::CloseHandle(aParam.mServerPipeHandle);
+ } else {
+ // We are probably sending to parent so it should be able to duplicate.
+ pipe = aParam.mServerPipeHandle;
+ duplicateFromProcessId = ::GetCurrentProcessId();
+ }
+ }
+
+ WriteParam(aMsg, aParam.mPipeName);
+ WriteParam(aMsg, pipe);
+ WriteParam(aMsg, duplicateFromProcessId);
+ WriteParam(aMsg, aParam.mDestinationProcessId);
+ }
+ static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
+ {
+ DWORD duplicateFromProcessId;
+ bool r = (ReadParam(aMsg, aIter, &aResult->mPipeName) &&
+ ReadParam(aMsg, aIter, &aResult->mServerPipeHandle) &&
+ ReadParam(aMsg, aIter, &duplicateFromProcessId) &&
+ ReadParam(aMsg, aIter, &aResult->mDestinationProcessId));
+ if (!r) {
+ return r;
+ }
+
+ MOZ_RELEASE_ASSERT(aResult->mServerPipeHandle,
+ "Main process failed to duplicate pipe handle to child.");
+
+ // If this is a not the "server" side descriptor, we have finished.
+ if (aResult->mServerPipeHandle == INVALID_HANDLE_VALUE) {
+ return true;
+ }
+
+ MOZ_RELEASE_ASSERT(aResult->mDestinationProcessId == base::GetCurrentProcId());
+
+ // If the pipe has already been duplicated to us, we have finished.
+ if (!duplicateFromProcessId) {
+ return true;
+ }
+
+ // Otherwise duplicate the handle to us.
+ nsAutoHandle sourceProcess(::OpenProcess(PROCESS_DUP_HANDLE, FALSE,
+ duplicateFromProcessId));
+ if (!sourceProcess) {
+ return false;
+ }
+
+ HANDLE ourHandle;
+ BOOL duped = ::DuplicateHandle(sourceProcess, aResult->mServerPipeHandle,
+ ::GetCurrentProcess(), &ourHandle, 0, FALSE,
+ DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS);
+ if (!duped) {
+ aResult->mServerPipeHandle = INVALID_HANDLE_VALUE;
+ return false;
+ }
+
+ aResult->mServerPipeHandle = ourHandle;
+ return true;
+ }
+};
+
+} // namespace IPC
+
+
+#endif // mozilla_ipc_Transport_win_h