getipnodebyname
he = getipnodebyname (nodename, PF_INET6, 0, &error);
he = getipnodebyname (nodename, PF_INET, 0, &error);
struct hostent *getipnodebyname(const char *, int, int, int *);
he = getipnodebyname(name, af, ipnode_flags, &error);
hp = getipnodebyname(host, AF_INET, 0, &error);
hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);