char *mod_chanmode_format(struct mod_chanmode *desc, char *buffer);
void mod_chanmode_free(struct mod_chanmode *change);
int mod_chanmode(struct userNode *who, struct chanNode *channel, char **modes, unsigned int argc, unsigned int flags);
-typedef void (*mode_change_func_t) (struct chanNode *channel, struct userNode *user, const struct mod_chanmode *change);
-void reg_mode_change_func(mode_change_func_t handler);
+typedef void (*mode_change_func_t) (struct chanNode *channel, struct userNode *user, const struct mod_chanmode *change, void *extra);
+void reg_mode_change_func(mode_change_func_t handler, void *extra);
int irc_make_chanmode(struct chanNode *chan, char *out);
int client_modify_priv_by_name(struct userNode *who, char *priv, int what);