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diff --git a/utils/process/fdstream.cpp b/utils/process/fdstream.cpp
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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.
+
+#include "utils/process/fdstream.hpp"
+
+#include "utils/noncopyable.hpp"
+#include "utils/process/systembuf.hpp"
+
+
+namespace utils {
+namespace process {
+
+
+/// Private implementation fields for ifdstream.
+struct ifdstream::impl : utils::noncopyable {
+    /// The systembuf backing this file descriptor.
+    systembuf _systembuf;
+
+    /// Initializes private implementation data.
+    ///
+    /// \param fd The file descriptor.
+    impl(const int fd) : _systembuf(fd) {}
+};
+
+
+}  // namespace process
+}  // namespace utils
+
+
+namespace process = utils::process;
+
+
+/// Constructs a new ifdstream based on an open file descriptor.
+///
+/// This grabs ownership of the file descriptor.
+///
+/// \param fd The file descriptor to read from.  Must be open and valid.
+process::ifdstream::ifdstream(const int fd) :
+    std::istream(NULL),
+    _pimpl(new impl(fd))
+{
+    rdbuf(&_pimpl->_systembuf);
+}
+
+
+/// Destroys an ifdstream object.
+///
+/// \post The file descriptor attached to this stream is closed.
+process::ifdstream::~ifdstream(void)
+{
+}