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Notes: @(#)mtio.h 13.1 (Tolerant) 91/02/02 */
Names: »mtio.h«
└─⟦50656ff4a⟧ Bits:30010538 TX 3.1 Coldstart
└─⟦bbf173f5c⟧ »0004«
└─⟦this⟧ »./usr/include/sys/mtio.h«
/* @(#)mtio.h 13.1 (Tolerant) 91/02/02 */
/*
* mtio.h -- structures and definitions for mag tape I/O control commands
*/
#define MAX_MTBLOCK (64 * 1024) /* 64k is the max. tape block size */
/* 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 */
/* the following are non-standard functions */
/* and are subject to change */
#define MTRETEN 10 /* retension tape */
#define MTERASE 11 /* erase whole tape */
#define MTDISPL 12 /* change display indicator */
#define MTNOREW 13 /* do not rewind at close */
#define MTRESET 14 /* reset error status */
#define MT6250 15 /* set density to 6250 BPI */
#define MT1600 16 /* set density to 1600 BPI */
/* structure for MTIOCGET - mag tape get status command */
/* ***subject to change*** */
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 */
/* the following are non-standard totals (only cleared by MTIOCZERO) */
long mt_skips; /* files skipped */
long mt_reads; /* blocks successfully read */
long mt_writes; /* blocks successfully written */
long mt_readerrors; /* unrecoverable read errors */
long mt_writeerrors; /* unrecoverable write errors */
long mt_retries; /* retries performed (read and write) */
};
/*
* Constants for mt_type byte
*/
#define MT_CIPHER 01 /* 1600/3200 bpi Cipher streaming drive */
/* structure for MTIOBUFFERED - mag tape using bufferred tape i/o command */
struct mtbuf
{
u_long mt_block_size; /* tape block size (in bytes) */
short mt_rw; /* MTREAD or MTWRITE */
};
#define MTREAD 01 /* bufferred tape i/o on read */
#define MTWRITE 02 /* bufferred tape i/o on write */
/* 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 */
#define MTIOBUFFERED _IOW('m', 3, struct mtbuf) /* bufferred tape i/o */