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diff --git a/ipc/ipc_platform_file.cc b/ipc/ipc_platform_file.cc
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ipc/ipc_platform_file.h"
+
+namespace IPC {
+
+PlatformFileForTransit GetFileHandleForProcess(base::PlatformFile handle,
+ base::ProcessHandle process,
+ bool close_source_handle) {
+ IPC::PlatformFileForTransit out_handle;
+#if defined(OS_WIN)
+ DWORD options = DUPLICATE_SAME_ACCESS;
+ if (close_source_handle)
+ options |= DUPLICATE_CLOSE_SOURCE;
+ if (!::DuplicateHandle(::GetCurrentProcess(),
+ handle,
+ process,
+ &out_handle,
+ 0,
+ FALSE,
+ options)) {
+ out_handle = IPC::InvalidPlatformFileForTransit();
+ }
+#elif defined(OS_POSIX)
+ // If asked to close the source, we can simply re-use the source fd instead of
+ // dup()ing and close()ing.
+ // When we're not closing the source, we need to duplicate the handle and take
+ // ownership of that. The reason is that this function is often used to
+ // generate IPC messages, and the handle must remain valid until it's sent to
+ // the other process from the I/O thread. Without the dup, calling code might
+ // close the source handle before the message is sent, creating a race
+ // condition.
+ int fd = close_source_handle ? handle : ::dup(handle);
+ out_handle = base::FileDescriptor(fd, true);
+#else
+ #error Not implemented.
+#endif
+ return out_handle;
+}
+
+} // namespace IPC