awk script- delay 계산

if(addr() == 0)
    {
          struct hdr_cmn *ch = HDR_CMN(p);
         struct hdr_mac802_11* dh = HDR_MAC802_11(p);
         u_int16_t *t = (u_int16_t*) &dh->dh_fc;
         //PacketClassifier *tcph = PacketClassifier::classify(p);
        //printf("\naddr : %d, offset : %d \n",addr(),tcph->ackno());
        printf("\t[ %2x %2x %2x %2x ] %x %s %d\n",*t, dh->dh_duration,ETHER_ADDR(dh->dh_ra), ETHER_ADDR(dh->dh_ta), index_, packet_info.name(ch->ptype()), ch->size());
    }