DIOCRMODE
if((*Ioctl)(Ofn, DIOCRMODE, dkrmode) < 0) {
ret=(*Ioctl)(Ofn, DIOCRMODE, dkrmode);
if ((ret = (*Ioctl)(*fdreadp, DIOCRMODE, dkrmode)) < 0) {
if ( ioctl(ttyi, DIOCRMODE, dkrmode) == -1 )