+MachineOperation *machine_operation_unref(MachineOperation *o) {
+ if (!o)
+ return NULL;
+
+ sd_event_source_unref(o->event_source);
+
+ safe_close(o->errno_fd);
+
+ if (o->pid > 1)
+ (void) kill(o->pid, SIGKILL);
+
+ sd_bus_message_unref(o->message);
+
+ if (o->machine) {
+ LIST_REMOVE(operations, o->machine->operations, o);
+ o->machine->n_operations--;
+ }
+
+ free(o);
+ return NULL;
+}
+