+
+static int on_bus_track(sd_bus_track *t, void *userdata) {
+ DnsQuery *q = userdata;
+
+ assert(t);
+ assert(q);
+
+ log_debug("Client of active query vanished, aborting query.");
+ dns_query_complete(q, DNS_TRANSACTION_ABORTED);
+ return 0;
+}
+
+int dns_query_bus_track(DnsQuery *q, sd_bus *bus, sd_bus_message *m) {
+ int r;
+
+ assert(q);
+ assert(m);
+
+ if (!q->bus_track) {
+ r = sd_bus_track_new(bus, &q->bus_track, on_bus_track, q);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_track_add_sender(q->bus_track, m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}