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diff --git a/utils/process/fdstream.hpp b/utils/process/fdstream.hpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// 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.
+
+/// \file utils/process/fdstream.hpp
+/// Provides the utils::process::ifdstream class.
+
+#if !defined(UTILS_PROCESS_FDSTREAM_HPP)
+#define UTILS_PROCESS_FDSTREAM_HPP
+
+#include "utils/process/fdstream_fwd.hpp"
+
+#include <istream>
+#include <memory>
+
+#include "utils/noncopyable.hpp"
+
+namespace utils {
+namespace process {
+
+
+/// An input stream backed by a file descriptor.
+///
+/// This class grabs ownership of the file descriptor.  I.e. when the class is
+/// destroyed, the file descriptor is closed unconditionally.
+class ifdstream : public std::istream, noncopyable
+{
+    struct impl;
+
+    /// Pointer to the shared internal implementation.
+    std::auto_ptr< impl > _pimpl;
+
+public:
+    explicit ifdstream(const int);
+    ~ifdstream(void);
+};
+
+
+}  // namespace process
+}  // namespace utils
+
+#endif  // !defined(UTILS_PROCESS_FDSTREAM_HPP)