1 /* mtio.h 4.5 81/04/02 */ 2 /* 3 * Structures and definitions for mag tape io control commands 4 */ 5 6 /* mag tape io control commands */ 7 #define MTIOCTOP (('m'<<8)|1) /* do a mag tape op */ 8 #define MTIOCGET (('m'<<8)|2) /* get mag tape status */ 9 10 /* structure for MTIOCTOP - mag tape op command */ 11 struct mtop { 12 short mt_op; /* operations defined below */ 13 daddr_t mt_count; /* how many of them */ 14 }; 15 16 /* operations */ 17 #define MTWEOF 0 /* write an end-of-file record */ 18 #define MTFSF 1 /* forward space file */ 19 #define MTBSF 2 /* backward space file */ 20 #define MTFSR 3 /* forward space record */ 21 #define MTBSR 4 /* backward space record */ 22 #define MTREW 5 /* rewind */ 23 #define MTOFFL 6 /* rewind and put the drive offline */ 24 #define MTNOP 7 /* no operation, sets status only */ 25 26 /* structure for MTIOCGET - mag tape get status command */ 27 28 struct mtget { 29 short mt_type; /* type of magtape device */ 30 /* the following two registers are grossly device dependent */ 31 short mt_dsreg; /* ``drive status'' register */ 32 short mt_erreg; /* ``error'' register */ 33 /* end device-dependent registers */ 34 short mt_resid; /* residual count */ 35 /* the following two are not yet implemented */ 36 daddr_t mt_fileno; /* file number of current position */ 37 daddr_t mt_blkno; /* block number of current position */ 38 /* end not yet implemented */ 39 }; 40 41 /* 42 * Constants for mt_type byte 43 */ 44 #define MT_ISTS 01 45 #define MT_ISHT 02 46 #define MT_ISTM 03 47