| 1 | /* |
| 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | * |
| 6 | * @(#)dkio.h 7.2 (Berkeley) 12/22/87 |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Structures and definitions for disk io control commands |
| 11 | * |
| 12 | * THIS WHOLE AREA NEEDS MORE THOUGHT. FOR NOW JUST IMPLEMENT |
| 13 | * ENOUGH TO READ AND WRITE HEADERS ON MASSBUS DISKS. EVENTUALLY |
| 14 | * SHOULD BE ABLE TO DETERMINE DRIVE TYPE AND DO OTHER GOOD STUFF. |
| 15 | */ |
| 16 | |
| 17 | /* disk io control commands */ |
| 18 | #define DKIOCHDR _IO('d', 1) /* next I/O will read/write header */ |