taglinefilesource code
SIOCGIFMTU57arch/sparc/kernel/sunos_ioctl.creturn sys_ioctl(fd, SIOCGIFMTU, arg);
SIOCGIFMTU1820net/appletalk/ddp.ccase SIOCGIFMTU:
SIOCGIFMTU1204net/core/dev.ccase SIOCGIFMTU:  /* Get the MTU of a device */
SIOCGIFMTU1320net/core/dev.ccase SIOCGIFMTU:
SIOCGIFMTU1274net/ipv4/af_inet.ccase SIOCGIFMTU: