message: Add SIGCHLD listener for manager process
diff: @@ -270,6 +270,7 @@ static int swManager_loop(swServer *serv)
  //for reload
  swSignal_add(SIGHUP, NULL);
  + swSignal_add(SIGCHLD, swManager_signal_handler);
  swSignal_add(SIGTERM, swManager_signal_handler);
  swSignal_add(SIGUSR1, swManager_signal_handler);
  swSignal_add(SIGUSR2, swManager_signal_handler);
  