From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 ipc/glue/Transport_win.h | 111 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 ipc/glue/Transport_win.h

(limited to 'ipc/glue/Transport_win.h')

diff --git a/ipc/glue/Transport_win.h b/ipc/glue/Transport_win.h
new file mode 100644
index 000000000..26aad6b34
--- /dev/null
+++ b/ipc/glue/Transport_win.h
@@ -0,0 +1,111 @@
+/* -*- 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
-- 
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