\section{Introduction}

\subsection{Closure Data-Structures}

Let assume we are defining an interface named \emph{if}, with the
following \emph{call} messages:
\begin{itemize}
  \item \verb!init_device_irq!
  \item \verb!init_device!
  \item \verb!get_cap!
\end{itemize}

And the following \emph{response} messages:
\begin{itemize}
  \item \verb!transmit_next_cap_response!
  \item \verb!transmit_next_cap_error!
  \item \verb!init_device_error!
  \item \verb!init_device_response!
\end{itemize}

This will generates the following data-structures in \verb!if.h!. 

\subsubsection{Server-side}

\begin{description}
  \item \verb!if_service_response!:
    \begin{itemize}
    \item \verb!if_server_response_vtbl *! \verb!f!
      \begin{description}
        \item \verb!if_server_response_vtbl!: (auto-generated)
          \begin{itemize}
            \item \verb!if_transmit_next_cap_response_fn *! \verb!transmit_next_cap_response!
            \item \verb!if_transmit_next_cap_error_fn *! \verb!transmit_next_cap_error!
            \item \verb!if_init_device_error_fn *! \verb!init_device_error!
            \item \verb!if_init_device_response_fn *! \verb!init_device_response!
            \item \verb!chips_disconnect_handler_t! \verb!_disconnect!
          \end{itemize}
      \end{description}
    \item \verb!chips_connection *! conn
    \item \verb!if_service *! clp
      \begin{description}
        \item \verb!if_service!:
          \begin{itemize}
            \item \verb!if_server_call_vtbl *! \verb!f!
              \begin{description}
                \item \verb!if_server_call_vtbl!: (to be filled)
                  \begin{itemize}
                    \item \verb!if_init_device_fn *! \verb!init_device!
                    \item \verb!if_get_cap_fn *! \verb!get_cap!
                    \item \verb!chips_disconnect_handler_t! \verb!_disconnect!
                    \item \verb!chips_listen_callback_t! \verb!_listening!
                  \end{itemize}
              \end{description}
            \item \verb!void *! \verb!st!
          \end{itemize}
      \end{description}
    \end{itemize}
\end{description}


\subsubsection{Client-side}

\begin{description}
  \item \verb!if_client_response!:
    \begin{itemize}
      \item \verb!if_client_response_vtbl *! \verb!f!
        \begin{description}
          \item \verb!if_client_response_vtbl!: (to be filled)
            \begin{itemize}
            \item \verb!if_transmit_next_cap_response_fn *! \verb!transmit_next_cap_response!
            \item \verb!if_transmit_next_cap_error_fn *! \verb!transmit_next_cap_error!
            \item \verb!if_init_device_error_fn *! \verb!init_device_error!
            \item \verb!if_init_device_response_fn *! \verb!init_device_response!
            \item \verb!chips_disconnect_handler_t! \verb!_disconnect!
            \item \verb!if_connected_cb! \verb!_connected!
            \end{itemize}
        \end{description}
      \item \verb!if_client_call_vtbl *! \verb!f!
        \begin{description}
        \item \verb!if_client_call_vtbl!: (auto-generated)
          \begin{itemize}
          \item \verb!if_init_device_fn *! \verb!init_device!
          \item \verb!if_get_cap_fn *! \verb!get_cap!
          \item \verb!chips_disconnect_handler! \verb!_disconnect!
          \end{itemize}
        \end{description}
      \item \verb!chips_connection *! \verb!conn!
      \item \verb!void *! \verb!st!
    \end{itemize}
\end{description}