typedef void (*SilcPacketEosCb)(SilcPacketEngine engine,
                                    SilcPacketStream stream,
                                    void *callback_context,
                                    void *stream_context);

    The End Of Stream (EOS) callback, that is called by the packet engine
    when the underlaying stream has ended.  No more data can be sent to
    the stream or read from it.  The `stream' must be destroyed by
    calling the silc_packet_stream_destroy.  This callback is set in the
    SilcPacketCallbacks structure.