typedef enum { ... } SilcClientMessageType;

    Different message types for `say' client operation.  The application
    may filter the message sent by the library according this type.

    typedef enum {
      SILC_CLIENT_MESSAGE_INFO,            /* Informational */
      SILC_CLIENT_MESSAGE_WARNING,         /* Warning */
      SILC_CLIENT_MESSAGE_ERROR,           /* Error */
      SILC_CLIENT_MESSAGE_COMMAND_ERROR,   /* Error during command */
      SILC_CLIENT_MESSAGE_AUDIT,           /* Auditable */
    } SilcClientMessageType;