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diff --git a/runtime/base/unix_file/fd_file.h b/runtime/base/unix_file/fd_file.h
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+++ b/runtime/base/unix_file/fd_file.h
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+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BASE_UNIX_FILE_FD_FILE_H_
+#define BASE_UNIX_FILE_FD_FILE_H_
+
+#include <fcntl.h>
+#include <string>
+#include "base/unix_file/random_access_file.h"
+#include "base/macros.h"
+
+namespace unix_file {
+
+// A RandomAccessFile implementation backed by a file descriptor.
+//
+// Not thread safe.
+class FdFile : public RandomAccessFile {
+ public:
+  FdFile();
+  // Creates an FdFile using the given file descriptor. Takes ownership of the
+  // file descriptor. (Use DisableAutoClose to retain ownership.)
+  explicit FdFile(int fd);
+  explicit FdFile(int fd, const std::string& path);
+
+  // Destroys an FdFile, closing the file descriptor if Close hasn't already
+  // been called. (If you care about the return value of Close, call it
+  // yourself; this is meant to handle failure cases and read-only accesses.
+  // Note though that calling Close and checking its return value is still no
+  // guarantee that data actually made it to stable storage.)
+  virtual ~FdFile();
+
+  // Opens file 'file_path' using 'flags' and 'mode'.
+  bool Open(const std::string& file_path, int flags);
+  bool Open(const std::string& file_path, int flags, mode_t mode);
+
+  // RandomAccessFile API.
+  virtual int Close();
+  virtual int64_t Read(char* buf, int64_t byte_count, int64_t offset) const;
+  virtual int SetLength(int64_t new_length);
+  virtual int64_t GetLength() const;
+  virtual int64_t Write(const char* buf, int64_t byte_count, int64_t offset);
+  virtual int Flush();
+
+  // Bonus API.
+  int Fd() const;
+  bool IsOpened() const;
+  std::string GetPath() const;
+  void DisableAutoClose();
+  bool ReadFully(void* buffer, int64_t byte_count);
+  bool WriteFully(const void* buffer, int64_t byte_count);
+
+ private:
+  int fd_;
+  std::string file_path_;
+  bool auto_close_;
+
+  DISALLOW_COPY_AND_ASSIGN(FdFile);
+};
+
+}  // namespace unix_file
+
+#endif  // BASE_UNIX_FILE_FD_FILE_H_