Move //mojo/services/X/public/... to //mojo/services/X/... (part 1).

mojo/services/files/public/c/lib/fd_impl.h

-// Copyright 2015 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.
-
-#ifndef SERVICES_FILES_C_LIB_FD_IMPL_H_
-#define SERVICES_FILES_C_LIB_FD_IMPL_H_
-
-#include <memory>
-
-#include "files/public/c/mojio_sys_stat.h"
-#include "files/public/c/mojio_sys_types.h"
-#include "mojo/public/cpp/system/macros.h"
-
-namespace mojio {
-
-class ErrnoImpl;
-
-// |FDImpl| is an interface for file-descriptor-like objects, on top of which
-// <unistd.h>-style (and also <stdio.h>-style) functions may be implemented.
-// (For <unistd.h>-style functions, one needs a file descriptor table, since FDs
-// are integers with a prescribed allocation scheme.)
-//
-// <unistd.h> functions with a "boolean" return value (0 on success, -1 on
-// failure) here return a |bool| instead (true on success, false on failure). On
-// failure, all methods set "errno" using the |ErrnoImpl| passed to the
-// constructor.
-class FDImpl {
- public:
-  virtual ~FDImpl() {}
-
-  // <unistd.h>:
-  virtual bool Close() = 0;  // May be called only at most once.
-  virtual std::unique_ptr<FDImpl> Dup() = 0;
-  virtual bool Ftruncate(mojio_off_t length) = 0;
-  virtual mojio_off_t Lseek(mojio_off_t offset, int whence) = 0;
-  virtual mojio_ssize_t Read(void* buf, size_t count) = 0;
-  virtual mojio_ssize_t Write(const void* buf, size_t count) = 0;
-
-  // <sys/stat.h>:
-  virtual bool Fstat(struct mojio_stat* buf) = 0;
-
- protected:
-  // The |ErrnoImpl| must outlive this object and all objects transitively
-  // |Dup()|ed from it.
-  explicit FDImpl(ErrnoImpl* errno_impl) : errno_impl_(errno_impl) {}
-
-  ErrnoImpl* errno_impl() const { return errno_impl_; }
-
- private:
-  ErrnoImpl* const errno_impl_;
-
-  MOJO_DISALLOW_COPY_AND_ASSIGN(FDImpl);
-};
-
-}  // namespace mojio
-
-#endif  // SERVICES_FILES_C_LIB_FD_IMPL_H_