-static char *null_init(void *, void **, char *, int, char **, int);
-static char *loop_init(void *, void **, char *, int, char **, int);
+static const char *null_init(void *, void **, Config *, char *, int, char **,
+ int, int);
+static const char *loop_init(void *, void **, Config *, char *, int, char **,
+ int, int);
+static void null_free(void *);
+static void loop_free(void *);
+static void null_reconfig(void *, Config *);