ifioctl
error = ifioctl(so, cmd, data, cred);
int ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
error = ifioctl(&so, cmd, ap->a_data, ap->a_cred);
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
error = ifioctl(ifctx->so, SIOCSIFNETMASK,
error = ifioctl(ifctx->so, SIOCSIFNETMASK,
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred);