X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/8c8a5b54e79564c14fc7a2823a21a8f048449bcf..af359dea2e5ab3e937b62107ecd6a51d78189ed7:/usr/src/share/man/man4/man4.tahoe/mtio.4 diff --git a/usr/src/share/man/man4/man4.tahoe/mtio.4 b/usr/src/share/man/man4/man4.tahoe/mtio.4 index d543714ce5..5e5690bc78 100644 --- a/usr/src/share/man/man4/man4.tahoe/mtio.4 +++ b/usr/src/share/man/man4/man4.tahoe/mtio.4 @@ -1,140 +1,217 @@ -.\" Copyright (c) 1986 The Regents of the University of California. +.\" Copyright (c) 1986, 1991 The Regents of the University of California. .\" All rights reserved. .\" -.\" %sccs.include.redist.man% +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. .\" -.\" @(#)mtio.4 6.4 (Berkeley) %G% +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. .\" -.TH MT 4 "" -.UC 7 -.SH NAME -mt \- UNIX magtape interface -.SH DESCRIPTION -The files -.I "cy0s, ..., cy15s" -refer to the UNIX magtape drives, -which may be on the VERSABUS using the CIPHER tapemaster formatter -.IR cy (4), -The following description applies to any of the transport/controller pairs. -The files -.I "cy0s, ..., cy15s" -are read/written in 25ips, -The density (1600 bpi or 3200 bpi) is selected by a switch on the drive. +.\" @(#)mtio.4 6.4 (Berkeley) 5/6/91 +.\" +.Dd May 6, 1991 +.Dt MTIO 4 +.Os +.Sh NAME +.Nm mtio +.Nd +.Tn UNIX +magtape interface +.Sh DESCRIPTION +The special files named +.Pa /dev/cy0s , +..., +.Pa /dev/cy15s +are interfaces to the +.Tn UNIX +magtape drivers. +For the +Tahoe, these interfaces +may be on the +.Tn VERSABUS +via a +.Tn CIPHER +tapemaster formatter +.Xr cy 4 . The files -.I "cy0s, ..., cy7s" -are rewound when closed. -The non-rewinding files are named -.I ncy[0-7] -respectively. -.PP -For compatibility, the -.I [n]cy*s +.Pa cy0s , +..., +.Pa cy15s +are read/written in 25 +.Tn IPS , +The density (1600 +.Tn BPI +or 3200 +.Tn BPI ) +is selected by a switch on the drive. +The following table of device names +applies to any of the transport/controller pairs. +.Bl -column "rewindxxx" "No-rewindxxx" "rewindxxxx" "No-rewindxxxx" -offset indent +.Em Rewind No-rewind Rewind No-rewind +cy0s/rcy0s ncy0s/nrcy0s cy8s/rcy8s ncy8s/nrcy8s +cy1s/rcy1s ncy1s/nrcy1s cy9s/rcy9s ncy9s/nrcy9s +cy2s/rcy2s ncy2s/nrcy2s cy10s/rcy10s ncy10s/nrcy10s +cy3s/rcy3s ncy3s/nrcy3s cy11s/rcy11s ncy11s/nrcy11s +cy4s/rcy4s ncy4s/nrcy4s cy12s/rcy12s ncy12s/nrcy12s +cy5s/rcy5s ncy5s/nrcy5s cy13s/rcy13s ncy13s/nrcy13s +cy6s/rcy6s ncy6s/nrcy6s cy14s/rcy14s ncy14s/nrcy14s +cy7s/rcy7s ncy7s/nrcy7s cy15s/rcy15s ncy15s/nrcy15s +.El +.Pp +The rewind devices automatically rewind +when the last requested read, write or seek has finished, or the end of the tape +has been reached. The letter +.Ql n +is usually prepended to +the name of the no-rewind devices. +.Pp +For compatibility with customary +.Tn UNIX +tape device +names +.Dq Em mt* , +the +.Bo Pa n Bc Pa cy*s files are linked to appropriate -.I [n]mt* +.Bo Pa n Bc Em mt* files. -.PP -When a file open for writing is closed, two file-marks are written. -If the tape is not to be rewound -it is positioned with the head between the two -file-marks. -.PP -A standard tape consists of a -series of 1024 byte records terminated by two -file-marks. -To the extent possible, the system makes -it possible, if inefficient, to treat -the tape like any other file. -Seeks have their usual meaning and it is possible -to read or write a byte at a time. -.PP -The -.I mt -files discussed above are useful -when it is desired to access the tape in a way -compatible with ordinary files. -When foreign tapes are to be dealt with, and especially -when long records are to be read or written, the -`raw' interface is appropriate. -Writing in very small units is inadvisable, -however, because it tends to create monstrous record -gaps. The associated files are named -.I "rcy0s, ..., rcy15s," -but the same minor-device considerations as for the regular files still apply, -as well as the appropriate -.I r[n]mt* -links. -.PP -A number of other ioctl operations are available +.Pp +Unix tapes are written in multiples of 1024 byte block +records. Two end-of-file markers mark the end of a tape, and +one end-of-file marker marks the end of a tape file. +If the tape is not to be rewound it is positioned with the +head in between the two tape marks, where the next write +will over write the second end-of-file marker. +.Pp +All of the magtape devices may be manipulated with the +.Xr mt 1 +command. +.Pp +A number of other +.Xr ioctl 2 +operations are available on raw magnetic tape. -The following definitions are from : -.PP -.nf +The following definitions are from +.Aq Pa sys/mtio.h : +.Bd -literal /* * Structures and definitions for mag tape io control commands */ -/* mag tape io control commands */ -#define MTIOCTOP (('m'<<8)|1) /* do a mag tape op */ -#define MTIOCGET (('m'<<8)|2) /* get mag tape status */ - /* structure for MTIOCTOP - mag tape op command */ -struct mtop { +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 */ +#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 */ +#define MTCACHE 8 /* enable controller cache */ +#define MTNOCACHE 9 /* disable controller cache */ /* structure for MTIOCGET - mag tape get status command */ -struct mtget { - short mt_type; /* type of magtape device */ +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 */ + short mt_dsreg; /* ``drive status'' register */ + short mt_erreg; /* ``error'' register */ /* end device-dependent registers */ - short mt_resid; /* residual count */ + 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 */ + 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 + * Constants for mt_type byte. These are the same + * for controllers compatible with the types listed. + */ +#define MT_ISTS 0x01 /* TS-11 */ +#define MT_ISHT 0x02 /* TM03 Massbus: TE16, TU45, TU77 */ +#define MT_ISTM 0x03 /* TM11/TE10 Unibus */ +#define MT_ISMT 0x04 /* TM78/TU78 Massbus */ +#define MT_ISUT 0x05 /* SI TU-45 emulation on Unibus */ +#define MT_ISCPC 0x06 /* SUN */ +#define MT_ISAR 0x07 /* SUN */ +#define MT_ISTMSCP 0x08 /* DEC TMSCP protocol (TU81, TK50) */ +#define MT_ISCY 0x09 /* CCI Cipher */ +#define MT_ISCT 0x0a /* HP 1/4 tape */ +#define MT_ISFHP 0x0b /* HP 7980 1/2 tape */ +#define MT_ISEXABYTE 0x0c /* Exabyte */ +#define MT_ISEXA8200 0x0c /* Exabyte EXB-8200 */ +#define MT_ISEXA8500 0x0d /* Exabyte EXB-8500 */ +#define MT_ISVIPER1 0x0e /* Archive Viper-150 */ +#define MT_ISPYTHON 0x0f /* Archive Python (DAT) */ +#define MT_ISHPDAT 0x10 /* HP 35450A DAT drive */ + +/* 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 MTIOCIEOT _IO('m', 3) /* ignore EOT error */ +#define MTIOCEEOT _IO('m', 4) /* enable EOT error */ + +#ifndef KERNEL +#define DEFTAPE "/dev/rmt12" +#endif + +#ifdef KERNEL +/* + * minor device number */ -#define MT_ISTS 01 -#define MT_ISHT 02 -#define MT_ISTM 03 -.fi -.ft R -.PP -Each -.I read -or -.I write -call reads or writes the next record on the tape. -In the write case the record has the same length as the -buffer given. -During a read, the record size is passed -back as the number of bytes read, provided it is no greater -than the buffer size; -if the record is long, an error is indicated. -In raw tape I/O seeks are ignored. -A zero byte count is returned when a tape mark is read, -but another read will fetch the first record of the -new tape file. -.SH FILES -/dev/mt?, -/dev/rmt? -.SH "SEE ALSO" -mt(1), tar(1), cy(4) -.SH BUGS + +#define T_UNIT 003 /* unit selection */ +#define T_NOREWIND 004 /* no rewind on close */ +#define T_DENSEL 030 /* density select */ +#define T_800BPI 000 /* select 800 bpi */ +#define T_1600BPI 010 /* select 1600 bpi */ +#define T_6250BPI 020 /* select 6250 bpi */ +#define T_BADBPI 030 /* undefined selection */ +#endif +.Ed +.Sh FILES +.Bl -tag -width /dev/nrcy? -compact +.It Pa /dev/cy? , +.It Pa /dev/rcy? +Rewind devices. +.It Pa /dev/ncy? , +.It Pa /dev/nrcy? +No-rewind devices. +.It Pa /dev/[n]mt? , +.It Pa /dev/[n]rmt? +Linked device names. +.El +.Sh SEE ALSO +.Xr mt 1 , +.Xr tar 1 , +.Xr cy 4