void unbind_registered(registered_func_t *func);
int event_registered(struct UserNode *old_user, struct UserNode *new_user);
+typedef int freeuser_func_t(struct UserNode *user);
+int bind_freeuser(freeuser_func_t *func);
+void unbind_freeuser(freeuser_func_t *func);
+int event_freeuser(struct UserNode *user);
+
+typedef int freechan_func_t(struct ChanNode *chan);
+int bind_freechan(freechan_func_t *func);
+void unbind_freechan(freechan_func_t *func);
+int event_freechan(struct ChanNode *chan);
+
#endif
\ No newline at end of file