/* mtio.h 4.10 83/01/17 */ /* * Structures and definitions for mag tape io control commands */ /* structure for MTIOCTOP - mag tape op command */ struct mtop { short mt_op; /* operations defined below */ daddr_t mt_count; /* how many of them */ }; /* operations */ #define MTWEOF 0 /* write an end-of-file record */ #define MTFSF 1 /* forward space file */ #define MTBSF 2 /* backward space file */ #define MTFSR 3 /* forward space record */ #define MTBSR 4 /* backward space record */ #define MTREW 5 /* rewind */ #define MTOFFL 6 /* rewind and put the drive offline */ #define MTNOP 7 /* no operation, sets status only */ /* structure for MTIOCGET - mag tape get status command */ struct mtget { short mt_type; /* type of magtape device */ /* the following two registers are grossly device dependent */ short mt_dsreg; /* ``drive status'' register */ short mt_erreg; /* ``error'' register */ /* end device-dependent registers */ short mt_resid; /* residual count */ /* the following two are not yet implemented */ daddr_t mt_fileno; /* file number of current position */ daddr_t mt_blkno; /* block number of current position */ /* end not yet implemented */ }; /* * Constants for mt_type byte */ #define MT_ISTS 0x01 #define MT_ISHT 0x02 #define MT_ISTM 0x03 #define MT_ISMT 0x04 #define MT_ISUT 0x05 #define MT_ISCPC 0x06 #define MT_ISAR 0x07 /* mag tape io control commands */ #define MTIOCTOP _IOW(m, 1, struct mtop) /* do a mag tape op */ #define MTIOCGET _IOR(m, 2, struct mtget) /* get tape status */ #ifndef KERNEL #define DEFTAPE "/dev/rmt12" #endif