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