-void ofproto_get_listeners(const struct ofproto *, struct svec *);
-void ofproto_get_snoops(const struct ofproto *, struct svec *);
+void ofproto_get_listeners(const struct ofproto *, struct sset *);
+bool ofproto_has_snoops(const struct ofproto *);
+void ofproto_get_snoops(const struct ofproto *, struct sset *);