- s->event->n_enabled_child_sources++;
-
- if (!s->event->signal_sources || !s->event->signal_sources[SIGCHLD]) {
- assert_se(sigaddset(&s->event->sigset, SIGCHLD) == 0);
- event_update_signal_fd(s->event);
+ if (!need_signal(s->event, SIGCHLD)) {
+ assert_se(sigaddset(&s->event->sigset, s->signal.sig) == 0);
+
+ r = event_update_signal_fd(s->event);
+ if (r < 0) {
+ s->enabled = SD_EVENT_OFF;
+ return r;
+ }