+
+fail:
+ if (added) {
+ d->fd = safe_close(d->fd);
+ hashmap_remove(e->signal_data, &d->priority);
+ free(d);
+ }
+
+ return r;
+}
+
+static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig) {
+ assert(e);
+ assert(d);
+
+ /* Turns off the specified signal in the signal data
+ * object. If the signal mask of the object becomes empty that
+ * way removes it. */
+
+ if (sigismember(&d->sigset, sig) == 0)
+ return;
+
+ assert_se(sigdelset(&d->sigset, sig) >= 0);
+
+ if (sigisemptyset(&d->sigset)) {
+
+ /* If all the mask is all-zero we can get rid of the structure */
+ hashmap_remove(e->signal_data, &d->priority);
+ assert(!d->current);
+ safe_close(d->fd);
+ free(d);
+ return;
+ }
+
+ assert(d->fd >= 0);
+
+ if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0)
+ log_debug_errno(errno, "Failed to unset signal bit, ignoring: %m");
+}
+
+static void event_gc_signal_data(sd_event *e, const int64_t *priority, int sig) {
+ struct signal_data *d;
+ static const int64_t zero_priority = 0;
+
+ assert(e);
+
+ /* Rechecks if the specified signal is still something we are
+ * interested in. If not, we'll unmask it, and possibly drop
+ * the signalfd for it. */
+
+ if (sig == SIGCHLD &&
+ e->n_enabled_child_sources > 0)
+ return;
+
+ if (e->signal_sources &&
+ e->signal_sources[sig] &&
+ e->signal_sources[sig]->enabled != SD_EVENT_OFF)
+ return;
+
+ /*
+ * The specified signal might be enabled in three different queues:
+ *
+ * 1) the one that belongs to the priority passed (if it is non-NULL)
+ * 2) the one that belongs to the priority of the event source of the signal (if there is one)
+ * 3) the 0 priority (to cover the SIGCHLD case)
+ *
+ * Hence, let's remove it from all three here.
+ */
+
+ if (priority) {
+ d = hashmap_get(e->signal_data, priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);
+ }
+
+ if (e->signal_sources && e->signal_sources[sig]) {
+ d = hashmap_get(e->signal_data, &e->signal_sources[sig]->priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);
+ }
+
+ d = hashmap_get(e->signal_data, &zero_priority);
+ if (d)
+ event_unmask_signal_data(e, d, sig);