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Annotation of 43BSDTahoe/man/man8/rmt.8, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1983 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)rmt.8c      6.1 (Berkeley) 4/27/85
        !             6: .\"
        !             7: .TH RMT 8C "April 27, 1985"
        !             8: .UC 5
        !             9: .SH NAME
        !            10: rmt \- remote magtape protocol module
        !            11: .SH SYNOPSIS
        !            12: .B /etc/rmt
        !            13: .SH DESCRIPTION
        !            14: .I Rmt
        !            15: is a program used by the remote dump and restore programs
        !            16: in manipulating a magnetic tape drive through an interprocess
        !            17: communication connection.
        !            18: .I Rmt
        !            19: is normally started up with an
        !            20: .IR rexec (3X)
        !            21: or
        !            22: .IR rcmd (3X)
        !            23: call.
        !            24: .PP
        !            25: The 
        !            26: .I rmt
        !            27: program accepts requests specific to the manipulation of
        !            28: magnetic tapes, performs the commands, then responds with
        !            29: a status indication.  All responses are in ASCII and in
        !            30: one of two forms. 
        !            31: Successful commands have responses of
        !            32: .PP
        !            33: .ti +0.5i
        !            34: \fBA\fInumber\fR\en
        !            35: .PP
        !            36: where 
        !            37: .I number
        !            38: is an ASCII representation of a decimal number.
        !            39: Unsuccessful commands are responded to with
        !            40: .PP
        !            41: .ti +0.5i
        !            42: \fBE\fIerror-number\fR\en\fIerror-message\fR\en,
        !            43: .PP
        !            44: where
        !            45: .I error-number
        !            46: is one of the possible error
        !            47: numbers described in
        !            48: .IR intro (2)
        !            49: and
        !            50: .I error-message
        !            51: is the corresponding error string as printed
        !            52: from a call to
        !            53: .IR perror (3).
        !            54: The protocol is comprised of the
        !            55: following commands (a space is present between each token).
        !            56: .TP 15
        !            57: .B O device mode
        !            58: Open the specified 
        !            59: .I device
        !            60: using the indicated
        !            61: .IR mode .
        !            62: .I Device
        !            63: is a full pathname and
        !            64: .I mode
        !            65: is an ASCII representation of a decimal
        !            66: number suitable for passing to
        !            67: .IR open (2).
        !            68: If a device had already been opened, it is
        !            69: closed before a new open is performed.
        !            70: .TP 15
        !            71: .B C device
        !            72: Close the currently open device.  The
        !            73: .I device
        !            74: specified is ignored.
        !            75: .TP 15
        !            76: .B L whence offset
        !            77: Perform an
        !            78: .IR lseek (2)
        !            79: operation using the specified parameters.
        !            80: The response value is that returned from the
        !            81: .I lseek
        !            82: call.
        !            83: .TP 15
        !            84: .B W count
        !            85: Write data onto the open device.
        !            86: .I Rmt
        !            87: reads
        !            88: .I count
        !            89: bytes from the connection, aborting if
        !            90: a premature end-of-file is encountered.
        !            91: The response value is that returned from
        !            92: the
        !            93: .IR write (2)
        !            94: call.
        !            95: .TP 15
        !            96: .B R count
        !            97: Read
        !            98: .I count
        !            99: bytes of data from the open device.
        !           100: If
        !           101: .I count
        !           102: exceeds the size of the data buffer (10 kilobytes), it is
        !           103: truncated to the data buffer size.
        !           104: .I Rmt
        !           105: then performs the requested 
        !           106: .IR read (2)
        !           107: and responds with 
        !           108: \fBA\fIcount-read\fR\en if the read was
        !           109: successful; otherwise an error in the
        !           110: standard format is returned.  If the read
        !           111: was successful, the data read is then sent.
        !           112: .TP 15
        !           113: .B I operation count 
        !           114: Perform a MTIOCOP 
        !           115: .IR ioctl (2)
        !           116: command using the specified parameters.
        !           117: The parameters are interpreted as the
        !           118: ASCII representations of the decimal values
        !           119: to place in the 
        !           120: .I mt_op
        !           121: and
        !           122: .I mt_count
        !           123: fields of the structure used in the
        !           124: .I ioctl
        !           125: call.  The return value is the
        !           126: .I count
        !           127: parameter when the operation is successful.
        !           128: .TP 15
        !           129: .B S
        !           130: Return the status of the open device, as
        !           131: obtained with a MTIOCGET 
        !           132: .I ioctl
        !           133: call.  If the operation was successful,
        !           134: an ``ack'' is sent with the size of the
        !           135: status buffer, then the status buffer is
        !           136: sent (in binary).
        !           137: .PP
        !           138: Any other command causes 
        !           139: .I rmt
        !           140: to exit.
        !           141: .SH DIAGNOSTICS
        !           142: All responses are of the form described above.
        !           143: .SH "SEE ALSO"
        !           144: rcmd(3X),
        !           145: rexec(3X),
        !           146: mtio(4),
        !           147: rdump(8C),
        !           148: rrestore(8C)
        !           149: .SH BUGS
        !           150: People tempted to use this for a remote file access protocol
        !           151: are discouraged.

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