in6p_hops
inp->in6p_hops = -1; /* use kernel default */
if (in6p && in6p->in6p_hops >= 0) {
return (in6p->in6p_hops);
in6p->in6p_hops = optval;
optval = in6p->in6p_hops;
inp->in6p_hops = -1; /* use kernel default */
inp->in6p_hops = -1; /* use kernel default */