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

native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc

Index: native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc b/native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc
index 268cbea7a593bc0841317d2aeb38cb6b8bd6ce11..5e7ec8a3afbd22ba03c6e6d7b19aead166b7bf88 100644
--- a/native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc
+++ b/native_client_sdk/src/libraries/nacl_io/mount_passthrough.cc
@@ -108,6 +108,11 @@ Error MountPassthrough::Init(int dev,
 
 void MountPassthrough::Destroy() {}
 
+Error MountPassthrough::Access(const Path& path, int a_mode) {
+  // There is no underlying 'access' syscall in NaCl. It just returns ENOSYS.
+  return ENOSYS;
+}
+
 Error MountPassthrough::Open(const Path& path, int mode, MountNode** out_node) {
   *out_node = NULL;