ifreq_size
(ifreq_size (*ifr)
for (i = 0; i + sizeof(struct ifreq) <= n; i+= ifreq_size(*ifr) ) {
for (i = 0; i + sizeof(struct ifreq) <= n; i+= ifreq_size(*ifr) ) {
if (i + ifreq_size(*ifr) > n)
for (j = 0; j < i; j += ifreq_size(*ifr2)) {
&& ifreq_size (*ifr) == ifreq_size (*ifr2)