typedef int (*rad_listen_recv_t)(rad_listen_t *, RAD_REQUEST_FUNP *, REQUEST **);
typedef int (*rad_listen_send_t)(rad_listen_t *, REQUEST *);
-typedef int (*rad_listen_print_t)(rad_listen_t *, char *, size_t);
+typedef int (*rad_listen_print_t)(const rad_listen_t *, char *, size_t);
typedef int (*rad_listen_encode_t)(rad_listen_t *, REQUEST *);
typedef int (*rad_listen_decode_t)(rad_listen_t *, REQUEST *);