grpc_call_arg_stack_with_attr_np - Executes an RPC.
  int grpc_call_arg_stack_with_attr_np(grpc_function_handle_t *handle,
                          grpc_session_attr_t_np *session_attr,
                          grpc_arg_stack_t *stack)
  grpc_function_handle_t *handle  grpc_session_attr_t_np *session_attr  grpc_arg_stack_t *stackThe grpc_call_arg_stack_with_attr_np() function calls the function defined by the function handle. The grpc_call_arg_stack_with_attr_np() function is blocked until the called function completes execution.
This function is MT-safe.
If successful, 0 is returned. In the case of an error, -1 is returned.
  GRPC_NOT_INITIALIZED  GRPC_OTHER_ERROR_CODE