NSD_SHUTDOWN
data->nsd->mode = NSD_SHUTDOWN;
case NSD_SHUTDOWN:
sig_atomic_t cmd = NSD_SHUTDOWN;
case NSD_SHUTDOWN:
return NSD_SHUTDOWN;
while ((mode = nsd->mode) != NSD_SHUTDOWN) {
case NSD_SHUTDOWN:
if(m == NSD_QUIT || m == NSD_SHUTDOWN ||