PIOCOPENM
if ((fd = ioctl(pfd, PIOCOPENM, (void *)0)) == -1) {
case PIOCOPENM: /* open mapped object for reading */
case PIOCOPENM: /* open mapped object for reading */
case PIOCOPENM: /* open mapped object for reading */
case PIOCOPENM: /* open mapped object for reading */