.\" 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
+.\" 3. 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.
.\"
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.\" $Id: rmt.8.in,v 1.2 1999/10/11 13:31:14 stelian Exp $
+.\" $Id: rmt.8.in,v 1.10 2003/03/30 15:40:40 stelian Exp $
.\"
-.Dd __DATE__
-.Dt RMT 8
-.Os "__VERSION__"
-.Sh NAME
-.Nm rmt
-.Nd remote magtape protocol module
-.Sh SYNOPSIS
-.Nm rmt
-.Sh DESCRIPTION
-.Nm Rmt
-is a program used by the remote dump and restore programs
-in manipulating a magnetic tape drive through an interprocess
+.TH RMT 8 "version __VERSION__ of __DATE__" BSD "System management commands"
+.SH NAME
+rmt \- remote magtape protocol module
+.SH SYNOPSIS
+.B rmt
+.SH DESCRIPTION
+.B Rmt
+is a program used by the remote
+.BR dump (8),
+.BR restore (8)
+or
+.BR tar (1)
+programs in manipulating a magnetic tape drive through an interprocess
communication connection.
-.Nm Rmt
+.B Rmt
is normally started up with an
-.Xr rexec 3
+.BR rexec (3)
or
-.Xr rcmd 3
+.BR rcmd (3)
call.
-.Pp
+.PP
The
-.Nm
-program accepts requests specific to the manipulation of
-magnetic tapes, performs the commands, then responds with
-a status indication. All responses are in
-.Tn ASCII
-and in
-one of two forms.
+.B rmt
+program accepts requests specific to the manipulation of magnetic tapes,
+performs the commands, then responds with a status indication. All responses
+are in
+.B ASCII
+and in one of the following two forms.
+.PP
Successful commands have responses of:
-.Bd -filled -offset indent
-.Sm off
-.Sy A Ar number No \en
-.Sm on
-.Ed
-.Pp
-.Ar Number
+.RS
+.B A\fInumber\fR\en
+.RE
+.PP
+where
+.I number
is an
-.Tn ASCII
+.B ASCII
representation of a decimal number.
+.PP
Unsuccessful commands are responded to with:
-.Bd -filled -offset indent
-.Sm off
-.Xo Sy E Ar error-number
-.No \en Ar error-message
-.No \en
-.Xc
-.Sm on
-.Ed
-.Pp
-.Ar Error-number
-is one of the possible error
-numbers described in
-.Xr intro 2
+.RS
+.B E\fIerror-number\fR\en\fIerror-message\fR\en
+.RE
+.PP
+where
+.I error-number
+is one of the possible error numbers described in
+.BR intro (2)
and
-.Ar error-message
-is the corresponding error string as printed
-from a call to
-.Xr perror 3 .
-The protocol is comprised of the
-following commands, which are sent as indicated - no spaces are supplied
-between the command and its arguments, or between its arguments, and
-.Ql \en
-indicates that a newline should be supplied:
-.Bl -tag -width Ds
-.Sm off
-.It Xo Sy \&O Ar device
-.No \en Ar mode No \en
-.Xc
+.I error-message
+is the corresponding error string as printed from a call to
+.BR perror (3).
+.PP
+The protocol is comprised of the following commands, which are sent as
+indicated - no spaces are supplied between the command and its arguments, or
+between its arguments, and \en indicates that a newline should be supplied:
+.TP
+.B O\fIdevice\fR\en\fImode\fR\en
Open the specified
-.Ar device
+.I device
using the indicated
-.Ar mode .
-.Ar Device
+.IR mode .
+.I Device
is a full pathname and
-.Ar mode
+.I mode
is an
-.Tn ASCII
-representation of a decimal
-number suitable for passing to
-.Xr open 2 .
-If a device had already been opened, it is
-closed before a new open is performed.
-.It Xo Sy C Ar device No \en
-.Xc
+.B ASCII
+representation of a decimal number suitable for passing to
+.BR open (2).
+If a device had already been opened, it is closed before a new open is
+performed.
+.TP
+.B C\fIdevice\fR\en
Close the currently open device. The
-.Ar device
+.I device
specified is ignored.
-.It Xo Sy L
-.Ar whence No \en
-.Ar offset No \en
-.Xc
-.Sm on
+.TP
+.B L\fIwhence\fR\en\fIoffset\fR\en
Perform an
-.Xr lseek 2
-operation using the specified parameters.
-The response value is that returned from the
-.Xr lseek
+.BR lseek (2)
+operation using the specified parameters. The response value is that returned
+from the
+.B lseek
call.
-.Sm off
-.It Sy W Ar count No \en
-.Sm on
+.TP
+.B W\fIcount\fR\en
Write data onto the open device.
-.Nm Rmt
+.B Rmt
reads
-.Ar count
-bytes from the connection, aborting if
-a premature end-of-file is encountered.
-The response value is that returned from
-the
-.Xr write 2
+.I count
+bytes from the connection, aborting if a premature end-of-file is encountered.
+The response value is that returned from the
+.BR write (2)
call.
-.Sm off
-.It Sy R Ar count No \en
-.Sm on
+.TP
+.B R\fIcount\fR\en
Read
-.Ar count
-bytes of data from the open device.
-If
-.Ar count
-exceeds the size of the data buffer (10 kilobytes), it is
-truncated to the data buffer size.
-.Nm Rmt
+.I count
+bytes of data from the open device. If
+.I count
+exceeds the size of the data buffer (10 kilobytes), it is truncated to the
+data buffer size.
+.B Rmt
then performs the requested
-.Xr read 2
+.BR read (2)
and responds with
-.Sm off
-.Sy A Ar count-read No \en
-.Sm on
-if the read was
-successful; otherwise an error in the
-standard format is returned. If the read
-was successful, the data read is then sent.
-.Sm off
-.It Xo Sy I Ar operation
-.No \en Ar count No \en
-.Xc
-.Sm on
+.B A\fIcount-read\fR\en
+if the read was successful; otherwise an error in the standard format is
+returned. If the read was successful, the data read is then sent.
+.TP
+.B I\fIoperation\fR\en\fIcount\fR\en
Perform a
-.Dv MTIOCOP
-.Xr ioctl 2
-command using the specified parameters.
-The parameters are interpreted as the
-.Tn ASCII
-representations of the decimal values
-to place in the
-.Ar mt_op
+.B MTIOCOP
+.BR ioctl (2)
+command using the specified parameters. The parameters are interpreted as the
+.B ASCII
+representations of the decimal values to place in the
+.B mt_op
and
-.Ar mt_count
+.B mt_count
fields of the structure used in the
-.Xr ioctl
+.B ioctl
call. The return value is the
-.Ar count
+.I count
parameter when the operation is successful.
-.ne 1i
-.It Sy S
-Return the status of the open device, as
-obtained with a
-.Dv MTIOCGET
-.Xr ioctl
-call. If the operation was successful,
-an ``ack'' is sent with the size of the
-status buffer, then the status buffer is
-sent (in binary).
-.El
-.Sm on
-.Pp
+.IP
+By issuing the
+.B I-1\en0\en
+command, a client will specify that he is using the VERSION 1 protocol.
+.IP
+For a VERSION 0 client, the
+.I operation
+parameter is the platform
+.B mt_op
+value (could be different if the client and the
+.B rmt
+server are on two different platforms). For a VERSION 1 client, the
+.I operation
+parameter is standardized as below:
+.RS
+.TP
+.B 0
+Issue a
+.B MTWEOF
+command (write
+.I count
+end-of-file records).
+.TP
+.B 1
+Issue a
+.B MTFSF
+command (forward space over
+.I count
+file marks).
+.TP
+.B 2
+Issue a
+.B MTBSF
+command (backward space over
+.I count
+file marks).
+.TP
+.B 3
+Issue a
+.B MTFSR
+command (forward space
+.I count
+inter-record gaps).
+.TP
+.B 4
+Issue a
+.B MTBSR
+command (backward space
+.I count
+inter-record gaps).
+.TP
+.B 5
+Issue a
+.B MTREW
+command (rewind).
+.TP
+.B 6
+Issue a
+.B MTOFFL
+command (rewind and put the drive offline).
+.TP
+.B 7
+Issue a
+.B MTNOP
+command (no operation, set status only).
+.RE
+.TP
+.B i\fIoperation\fR\en\fIcount\fR\en
+Perform an extended
+.B MTIOCOP
+.BR ioctl (2)
+command using the specified parameters. The parameters are interpreted as the
+.B ASCII
+representations of the decimal values to place in the
+.B mt_op
+and
+.B mt_count
+fields of the structure used in the
+.B ioctl
+call. The return value is the
+.I count
+parameter when the operation is successful. The possible operations are:
+.RS
+.TP
+.B 0
+Issue a
+.B MTCACHE
+command (switch cache on).
+.TP
+.B 1
+Issue a
+.B MTNOCACHE
+command (switch cache off).
+.TP
+.B 2
+Issue a
+.B MTRETEN
+command (retension the tape).
+.TP
+.B 3
+Issue a
+.B MTERASE
+command (erase the entire tape).
+.TP
+.B 4
+Issue a
+.B MTEOM
+command (position to end of media).
+.TP
+.B 5
+Issue a
+.B MTNBSF
+command (backward space count files to BOF).
+.RE
+.TP
+.B S
+Return the status of the open device, as obtained with a
+.B MTIOCGET
+.B ioctl
+call. If the operation was successful, an \*(lqack\*(rq is sent with the size
+of the status buffer, then the status buffer is sent (in binary, which is
+non-portable between different platforms).
+.TP
+.BI s sub-command
+This is a replacement for the previous
+.B S
+command, portable across different platforms. If the open device is a magnetic
+tape, return members of the magnetic tape status structure, as obtained with a
+.B MTIOCGET
+ioctl call. If the open device is not a magnetic tape, an error is returned. If
+the
+.B MTIOCGET
+operation was successful, the numerical value of the structure member is
+returned in decimal. The following sub commands are supported:
+.RS
+.TP
+.B T
+return the content of the structure member
+.B mt_type
+which contains the type of the magnetic tape device.
+.TP
+.B D
+return the content of the structure member
+.B mt_dsreg
+which contains the "drive status register".
+.TP
+.B E
+return the content of the structure member
+.B mt_erreg
+which contains the "error register". This structure member must be retrieved
+first because it is cleared after each
+.B MTIOCGET
+ioctl call.
+.TP
+.B R
+return the content of the structure member
+.B mt_resid
+which contains the residual count of the last I/O.
+.TP
+.B F
+return the content of the structure member
+.B mt_fileno
+which contains the file number of the current tape position.
+.TP
+.B B
+return the content of the structure member
+.B mt_blkno
+which contains the block number of the current tape position.
+.TP
+.B f
+return the content of the structure member
+.B mt_flags
+which contains MTF_ flags from the driver.
+.TP
+.B b
+return the content of the structure member
+.B mt_bf
+which contains the optimum blocking factor.
+.RE
+.PP
Any other command causes
-.Nm
+.B rmt
to exit.
-.Sh DIAGNOSTICS
+.SH DIAGNOSTICS
All responses are of the form described above.
-.Sh SEE ALSO
-.Xr rcmd 3 ,
-.Xr rexec 3 ,
-.Xr mtio 4 ,
-.Xr rdump 8 ,
-.Xr rrestore 8
-.Sh BUGS
-People should be discouraged from using this for a remote
-file access protocol.
-.Sh AUTHOR
+.SH SEE ALSO
+.BR rcmd (3),
+.BR rexec (3),
+.I /usr/include/sys/mtio.h,
+.BR rdump (8),
+.BR rrestore (8)
+.SH BUGS
+People should be discouraged from using this for a remote file access protocol.
+.SH AUTHOR
The
-.Nm dump/restore
-backup suit was ported to Linux's Second Extended File System
-by Remy Card <card@Linux.EU.Org>. He maintained the initial versions
-of dump (up and including 0.4b4, released in january 1997).
-.Pp
-Starting with 0.4b5, the new maintainer is Stelian Pop
-.br
-<pop@cybercable.fr>.
-.Sh AVAILABILITY
+.B dump/restore
+backup suit was ported to Linux's Second Extended File System by Remy Card
+<card@Linux.EU.Org>. He maintained the initial versions of
+.B dump
+(up and including 0.4b4, released in january 1997).
+.PP
+Starting with 0.4b5, the new maintainer is Stelian Pop <stelian@popies.net>.
+.SH AVAILABILITY
The
-.Nm dump/restore
-backup suit is available for anonymous ftp from tsx-11.mit.edu
-in /pub/linux/ALPHA/ext2fs (development versions) or
-/pub/linux/packages/ext2fs (stable versions).
-.Pp
-An alternate downloading location is http://perso.cybercable.fr/pop/dump.
-.Sh HISTORY
+.B dump/restore
+backup suit is available from <http://dump.sourceforge.net>
+.SH HISTORY
The
-.Nm
-command appeared in
-.Bx 4.2 .
+.B rmt
+command appeared in 4.2BSD.
git.wh0rd.org / dump.git / blobdiff