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Annotation of researchv9/sys/h/mtio.h, revision 1.1.1.1

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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