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

native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h

Index: native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h b/native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h
index 58b4d13d7ec1920d0985500ab8490a76fbc194b2..7398328778966e0087b6f1966d3a640a46382301 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount_node_html5fs.h
@@ -15,20 +15,26 @@ class MountNodeHtml5Fs : public MountNode {
   // 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 size_t GetSize();
+  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 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: