Symbol: LOOPBACK_IF
regress/lib/libpthread/pcap/pcap.c
38
handle = pcap_open_live(LOOPBACK_IF, SNAPLEN, NO_PROMISC, 0, errbuf);
usr.sbin/route6d/route6d.c
1395
if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))