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Annotation of 42BSD/sys/h/mtio.h, revision 1.1.1.1

1.1       root        1: /*     mtio.h  6.1     83/07/29        */
                      2: 
                      3: /*
                      4:  * Structures and definitions for mag tape io control commands
                      5:  */
                      6: 
                      7: /* structure for MTIOCTOP - mag tape op command */
                      8: struct mtop    {
                      9:        short   mt_op;          /* operations defined below */
                     10:        daddr_t mt_count;       /* how many of them */
                     11: };
                     12: 
                     13: /* operations */
                     14: #define MTWEOF 0       /* write an end-of-file record */
                     15: #define MTFSF  1       /* forward space file */
                     16: #define MTBSF  2       /* backward space file */
                     17: #define MTFSR  3       /* forward space record */
                     18: #define MTBSR  4       /* backward space record */
                     19: #define MTREW  5       /* rewind */
                     20: #define MTOFFL 6       /* rewind and put the drive offline */
                     21: #define MTNOP  7       /* no operation, sets status only */
                     22: 
                     23: /* structure for MTIOCGET - mag tape get status command */
                     24: 
                     25: struct mtget   {
                     26:        short   mt_type;        /* type of magtape device */
                     27: /* the following two registers are grossly device dependent */
                     28:        short   mt_dsreg;       /* ``drive status'' register */
                     29:        short   mt_erreg;       /* ``error'' register */
                     30: /* end device-dependent registers */
                     31:        short   mt_resid;       /* residual count */
                     32: /* the following two are not yet implemented */
                     33:        daddr_t mt_fileno;      /* file number of current position */
                     34:        daddr_t mt_blkno;       /* block number of current position */
                     35: /* end not yet implemented */
                     36: };
                     37: 
                     38: /*
                     39:  * Constants for mt_type byte
                     40:  */
                     41: #define        MT_ISTS         0x01
                     42: #define        MT_ISHT         0x02
                     43: #define        MT_ISTM         0x03
                     44: #define        MT_ISMT         0x04
                     45: #define        MT_ISUT         0x05
                     46: #define        MT_ISCPC        0x06
                     47: #define        MT_ISAR         0x07
                     48: 
                     49: /* mag tape io control commands */
                     50: #define        MTIOCTOP        _IOW(m, 1, struct mtop)         /* do a mag tape op */
                     51: #define        MTIOCGET        _IOR(m, 2, struct mtget)        /* get tape status */
                     52: 
                     53: #ifndef KERNEL
                     54: #define        DEFTAPE "/dev/rmt12"
                     55: #endif

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