[NaCl SDK] nacl_io: Added support for access() syscall.

native_client_sdk/src/libraries/nacl_io/mount.h

Index: native_client_sdk/src/libraries/nacl_io/mount.h
diff --git a/native_client_sdk/src/libraries/nacl_io/mount.h b/native_client_sdk/src/libraries/nacl_io/mount.h
index ddf1fd5c76814eb0b27be4793d938fff69a048bd..3fdb32dd2bbea88f4bff9bd910b0ca2d29507683 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount.h
+++ b/native_client_sdk/src/libraries/nacl_io/mount.h
@@ -52,6 +52,10 @@ class Mount : public RefObject {
 
   // All paths in functions below are expected to containing a leading "/".
 
+  // Test whether a file or directory at a given path can be accessed.
+  // Returns 0 on success, or an appropriate errno value on failure.
+  virtual Error Access(const Path& path, int a_mode) = 0;
+
   // Open a node at |path| with the specified open flags. The resulting
   // MountNode is created with a ref count of 1.
   // Assumes that |out_node| is non-NULL.