Symbol: SIOCGIFHARDMTU
regress/sbin/ifconfig/ifaddr.c
1839
if (ioctl(sock, SIOCGIFHARDMTU, (caddr_t)&ifr) != -1) {
sbin/ifconfig/ifconfig.c
6750
if (ioctl(sock, SIOCGIFHARDMTU, (caddr_t)&ifr) != -1) {
sys/net/if.c
2181
case SIOCGIFHARDMTU:
sys/net/if.c
2648
case SIOCGIFHARDMTU: