BIOCGDLTLIST
if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) == 0) {
if (ioctl(fd, BIOCGDLTLIST, (caddr_t)bdlp) == -1) {
case BIOCGDLTLIST:
case BIOCGDLTLIST:
if (ioctl(fd, BIOCGDLTLIST, &dl) == -1)