ONBITSMINOR
#define SVR3_MAJOR(x) ((major_t)((dev_t)(x) >> ONBITSMINOR) & OMAXMAJ)
((((ushort_t)(maj) & OMAXMAJ) << ONBITSMINOR) | \
maj = (devnum >> ONBITSMINOR);
devnum = ((majdev << ONBITSMINOR) | mindev);
return ((o_dev_t)((major_d << ONBITSMINOR) | minor_d));
major_d = ((dev >> ONBITSMINOR) & OMAXMAJ);