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Annotation of researchv9/sys/h/mtio.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Structures and definitions for mag tape io control commands
        !             3:  */
        !             4: 
        !             5: /* mag tape io control commands */
        !             6: #define MTIOCTOP       (('m'<<8)|1)    /* do a mag tape op */
        !             7: #define MTIOCGET       (('m'<<8)|2)    /* get mag tape status */
        !             8: #define MTIOCIEOT      (('m'<<8)|3)    /* ignore EOT error */
        !             9: #define MTIOCEEOT      (('m'<<8)|4)    /* enable EOT error */
        !            10: 
        !            11: /* structure for MTIOCTOP - mag tape op command */
        !            12: struct mtop    {
        !            13:        short   mt_op;          /* operations defined below */
        !            14:        daddr_t mt_count;       /* how many of them */
        !            15: };
        !            16: 
        !            17: /* operations */
        !            18: #define MTWEOF 0       /* write an end-of-file record */
        !            19: #define MTFSF  1       /* forward space file */
        !            20: #define MTBSF  2       /* backward space file */
        !            21: #define MTFSR  3       /* forward space record */
        !            22: #define MTBSR  4       /* backward space record */
        !            23: #define MTREW  5       /* rewind */
        !            24: #define MTOFFL 6       /* rewind and put the drive offline */
        !            25: #define MTNOP  7       /* no operation, sets status only */
        !            26: 
        !            27: /* structure for MTIOCGET - mag tape get status command */
        !            28: 
        !            29: struct mtget   {
        !            30:        short   mt_type;        /* type of magtape device */
        !            31: /* the following two registers are grossly device dependent */
        !            32:        short   mt_dsreg;       /* ``drive status'' register */
        !            33:        short   mt_erreg;       /* ``error'' register */
        !            34: /* end device-dependent registers */
        !            35:        short   mt_resid;       /* residual count */
        !            36: /* the following two are not yet implemented */
        !            37:        daddr_t mt_fileno;      /* file number of current position */
        !            38:        daddr_t mt_blkno;       /* block number of current position */
        !            39: /* end not yet implemented */
        !            40: };
        !            41: 
        !            42: /*
        !            43:  * Constants for mt_type byte
        !            44:  */
        !            45: #define MT_ISTS                01
        !            46: #define MT_ISHT                02
        !            47: #define MT_ISTM                03
        !            48: #define        MT_ISMT         04
        !            49: #define        MT_ISUT         05
        !            50: #define MT_ISTMSCP     06

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