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

native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.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_HTML5FS_NODE_H_
 #define LIBRARIES_NACL_IO_MOUNT_HTML5FS_NODE_H_
 
 #include <ppapi/c/pp_resource.h>
 #include "nacl_io/mount_node.h"
 
 class MountHtml5Fs;
 
 class MountNodeHtml5Fs : public MountNode {
  public:
   // Normal OS operations on a node (file), can be called by the kernel
   // directly so it must lock and unlock appropriately.  These functions
   // must not be called by the mount.
-  virtual int FSync();
-  virtual int GetDents(size_t offs, struct dirent* pdir, size_t count);
-  virtual int GetStat(struct stat* stat);
-  virtual int Read(size_t offs, void* buf, size_t count);
-  virtual int FTruncate(off_t size);
-  virtual int Write(size_t offs, const void* buf, size_t count);
+  virtual Error FSync();
+  virtual Error GetDents(size_t offs,
+                         struct dirent* pdir,
+                         size_t count,
+                         int* out_bytes);
+  virtual Error GetStat(struct stat* stat);
+  virtual Error Read(size_t offs, void* buf, size_t count, int* out_bytes);
+  virtual Error FTruncate(off_t size);
+  virtual Error Write(size_t offs,
+                      const void* buf,
+                      size_t count,
+                      int* out_bytes);
 
-  virtual size_t GetSize();
+  virtual Error GetSize(size_t *out_size);
 
  protected:
   MountNodeHtml5Fs(Mount* mount, PP_Resource fileref);
 
   // Init with standard open flags
-  virtual bool Init(int o_mode);
+  virtual Error Init(int o_mode);
   virtual void Destroy();
 
  private:
   PP_Resource fileref_resource_;
   PP_Resource fileio_resource_;
 
   friend class MountHtml5Fs;
 };
 
 #endif  // LIBRARIES_NACL_IO_MOUNT_HTML5FS_NODE_H_