gethostbyname2
struct hostent *gethostbyname2(const char *, int);
hp = gethostbyname2(name, af);
struct hostent *hp2 = gethostbyname2(name, AF_INET);
hen = gethostbyname2(hostname, AF_INET);
if ((he = gethostbyname2(host, family)) == NULL)
hp = gethostbyname2(source, AF_INET);
hp = gethostbyname2(target, AF_INET);
if ((hp = gethostbyname2(host, AF_INET)) == NULL) {
if ((hp = gethostbyname2(tag->name, AF_INET)) == NULL) {
#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))