HelenOS sources

atrans_lookup_locked  121 uspace/srv/net/ethip/atrans.c 	rc = atrans_lookup_locked(ip_addr, mac_addr);
atrans_lookup_locked  153 uspace/srv/net/ethip/atrans.c 	while ((rc = atrans_lookup_locked(ip_addr, mac_addr)) == ENOENT &&
HelenOS homepage, sources at GitHub