D_TTY
if (cdevsw[maj].d_type == D_TTY)
if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY)
cdevsw[major(vp->v_rdev)].d_type != D_TTY) {
D_TTY, 0, ttkqfilter }
D_TTY, 0, dev_init(c,n,kqfilter) }
D_TTY, 0, dev_init(c,n,kqfilter) }
D_TTY, 0, dev_init(c,n,kqfilter) }
D_TTY, 0, dev_init(c,n,kqfilter) }