[NaCl SDK] nacl_io: big refactor to return error value (errno).

native_client_sdk/src/libraries/nacl_io/mount_dev.h

 /* Copyright (c) 2012 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 LIBRARIES_NACL_IO_MOUNT_DEV_H_
 #define LIBRARIES_NACL_IO_MOUNT_DEV_H_
 
 #include "nacl_io/mount.h"
 
 class MountNode;
 
 class MountDev : public Mount {
  public:
-  virtual MountNode *Open(const Path& path, int mode);
+  virtual Error Open(const Path& path, int mode, MountNode** out_node);
 
-  virtual int Unlink(const Path& path);
-  virtual int Mkdir(const Path& path, int permissions);
-  virtual int Rmdir(const Path& path);
-  virtual int Remove(const Path& path);
+  virtual Error Unlink(const Path& path);
+  virtual Error Mkdir(const Path& path, int permissions);
+  virtual Error Rmdir(const Path& path);
+  virtual Error Remove(const Path& path);
 
  protected:
   MountDev();
 
-  virtual bool Init(int dev, StringMap_t& args, PepperInterface* ppapi);
+  virtual Error Init(int dev, StringMap_t& args, PepperInterface* ppapi);
   virtual void Destroy();
 
  private:
   MountNode* root_;
-  MountNode* null_node_;
-  MountNode* zero_node_;
-  MountNode* random_node_;
-  MountNode* console0_node_;
-  MountNode* console1_node_;
-  MountNode* console2_node_;
-  MountNode* console3_node_;
-  MountNode* tty_node_;
-  MountNode* stderr_node_;
-  MountNode* stdin_node_;
-  MountNode* stdout_node_;
 
   friend class Mount;
 };
 
 #endif  // LIBRARIES_NACL_IO_MOUNT_DEV_H_