SINGLE_SUSPEND
process_stop(pr, P_SUSPSIG, SINGLE_SUSPEND);
process_stop(pr, P_SUSPSIG, SINGLE_SUSPEND);
process_stop(pr, P_SUSPSIG, SINGLE_SUSPEND);
if (mode == SINGLE_SUSPEND) {
case SINGLE_SUSPEND:
process_stop(pr, P_SUSPSIG, SINGLE_SUSPEND);