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diff --git a/src/google/protobuf/compiler/subprocess.h b/src/google/protobuf/compiler/subprocess.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: kenton@google.com (Kenton Varda)
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
+#define GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN // right...
+#include <windows.h>
+#else // _WIN32
+#include <sys/types.h>
+#include <unistd.h>
+#endif // !_WIN32
+#include <google/protobuf/stubs/common.h>
+
+#include <string>
+
+
+namespace google {
+namespace protobuf {
+
+class Message;
+
+namespace compiler {
+
+// Utility class for launching sub-processes.
+class LIBPROTOC_EXPORT Subprocess {
+ public:
+ Subprocess();
+ ~Subprocess();
+
+ enum SearchMode {
+ SEARCH_PATH, // Use PATH environment variable.
+ EXACT_NAME // Program is an exact file name; don't use the PATH.
+ };
+
+ // Start the subprocess. Currently we don't provide a way to specify
+ // arguments as protoc plugins don't have any.
+ void Start(const string& program, SearchMode search_mode);
+
+ // Serialize the input message and pipe it to the subprocess's stdin, then
+ // close the pipe. Meanwhile, read from the subprocess's stdout and parse
+ // the data into *output. All this is done carefully to avoid deadlocks.
+ // Returns true if successful. On any sort of error, returns false and sets
+ // *error to a description of the problem.
+ bool Communicate(const Message& input, Message* output, string* error);
+
+#ifdef _WIN32
+ // Given an error code, returns a human-readable error message. This is
+ // defined here so that CommandLineInterface can share it.
+ static string Win32ErrorMessage(DWORD error_code);
+#endif
+
+ private:
+#ifdef _WIN32
+ DWORD process_start_error_;
+ HANDLE child_handle_;
+
+ // The file handles for our end of the child's pipes. We close each and
+ // set it to NULL when no longer needed.
+ HANDLE child_stdin_;
+ HANDLE child_stdout_;
+
+#else // _WIN32
+ pid_t child_pid_;
+
+ // The file descriptors for our end of the child's pipes. We close each and
+ // set it to -1 when no longer needed.
+ int child_stdin_;
+ int child_stdout_;
+
+#endif // !_WIN32
+};
+
+} // namespace compiler
+} // namespace protobuf
+
+} // namespace google
+#endif // GOOGLE_PROTOBUF_COMPILER_SUBPROCESS_H__