+
+void bus_unit_send_change_signal(Unit *u) {
+ char *p = NULL;
+ DBusMessage *m = NULL;
+
+ assert(u);
+ assert(u->meta.in_dbus_queue);
+
+ LIST_REMOVE(Meta, dbus_queue, u->meta.manager->dbus_unit_queue, &u->meta);
+ u->meta.in_dbus_queue = false;
+
+ if (set_isempty(u->meta.manager->subscribed))
+ return;
+
+ if (!(p = unit_dbus_path(u)))
+ goto oom;
+
+ if (u->meta.sent_dbus_new_signal) {
+ /* Send a change signal */
+
+ if (!(m = dbus_message_new_signal(p, "org.freedesktop.systemd1.Unit", "Changed")))
+ goto oom;
+ } else {
+ const char *id;
+ /* Send a new signal */
+
+ if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitNew")))
+ goto oom;
+
+ id = unit_id(u);
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &id,
+ DBUS_TYPE_OBJECT_PATH, &p,
+ DBUS_TYPE_INVALID))
+ goto oom;
+ }
+
+ if (!dbus_connection_send(u->meta.manager->api_bus, m, NULL))
+ goto oom;
+
+ free(p);
+ dbus_message_unref(m);
+
+ u->meta.sent_dbus_new_signal = true;
+
+ return;
+
+oom:
+ free(p);
+
+ if (m)
+ dbus_message_unref(m);
+
+ log_error("Failed to allocate unit change/new signal.");
+}
+
+void bus_unit_send_removed_signal(Unit *u) {
+ char *p = NULL;
+ DBusMessage *m = NULL;
+ const char *id;
+
+ assert(u);
+
+ if (set_isempty(u->meta.manager->subscribed) || !u->meta.sent_dbus_new_signal)
+ return;
+
+ if (!(p = unit_dbus_path(u)))
+ goto oom;
+
+ if (!(m = dbus_message_new_signal("/org/freedesktop/systemd1", "org.freedesktop.systemd1", "UnitRemoved")))
+ goto oom;
+
+ id = unit_id(u);
+ if (!dbus_message_append_args(m,
+ DBUS_TYPE_STRING, &id,
+ DBUS_TYPE_OBJECT_PATH, &p,
+ DBUS_TYPE_INVALID))
+ goto oom;
+
+ if (!dbus_connection_send(u->meta.manager->api_bus, m, NULL))
+ goto oom;
+
+ free(p);
+ dbus_message_unref(m);
+
+ return;
+
+oom:
+ free(p);
+
+ if (m)
+ dbus_message_unref(m);
+
+ log_error("Failed to allocate unit remove signal.");
+}