sg_family
sin.sg_family = hp->h_addrtype;
server_sin.sg_family = hp->h_addrtype;
client_sin.sg_family = hp->h_addrtype;
if (sg->sg_family == AF_INET6 &&
#define SGADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \
#define SGSOCKADDRSZ(sag) ((sag)->sg_family == AF_INET6 ? \
#define SGPORT(sag) (*((sag)->sg_family == AF_INET6 ? \
#define SGADDRP(sag) (((sag)->sg_family == AF_INET6 ? \
#define SGFAM(sag) ((sag)->sg_family == AF_INET6 ? \
((sag)->sg_family == AF_INET6 ? \