rn_addmask
if ((x = rn_addmask(m_arg, 1, head->rnh_treetop->rn_off)) ==
if ((x = rn_addmask(netmask, 0, top->rn_off)) == NULL) {
*rn_addmask(void *, uint_t, uint_t),
if ((x = rn_addmask(netmask, 1, head_off)) == NULL) {
x = rn_addmask(m_arg, 1, head->rnh_treetop->rn_offset);
if ((x = rn_addmask(netmask, 0, top->rn_offset)) == 0)
*rn_addmask(void *, int, int),
if ((x = rn_addmask(netmask, 1, head_off)) == 0)
*rn_addmask __P((void *, int, int)),