if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;
if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;