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System Administration Commands rmt(1M)
NAME
rmt - remote magtape protocol module
SYNOPSIS
/usr/sbin/rmt
DESCRIPTION
rmt is a program used by the remote dump and restore pro-
grams in manipulating a magnetic tape drive through an
interprocess communication connection. rmt is normally
started up with an rexec(3SOCKET) or rcmd(3SOCKET) call.
The rmt program accepts requests that are specific to the
manipulation of magnetic tapes, performs the commands, then
responds with a status indication. All responses are in
ASCII and in one of two forms. Successful commands have
responses of:
Anumber\n
where number is an ASCII representation of a decimal
number.
Unsuccessful commands are responded to with:
Eerror-number\nerror-message\n
where error-number is one of the possible error numbers
described in intro(3), and error-message is the
corresponding error string as printed from a call to
perror(3C).
The protocol consists of the following commands:
S\n Return the status of the open dev-
ice, as obtained with a MTIOCGET
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).
Cdevice\n Close the currently open device.
The device specified is ignored.
SunOS 5.10 Last change: 6 Nov 2000 1
System Administration Commands rmt(1M)
Ioperation\ncount\n Perform a MTIOCOP ioctl(2) command
using the specified parameters. The
parameters are interpreted as the
ASCII representations of the decimal
values to place in the mt_op and
mt_count fields of the structure
used in the ioctl call. When the
operation is successful the return
value is the count parameter.
Loffset\nwhence\n Perform an lseek(2) operation using
the specified parameters. The
response value is returned from the
lseek call.
Odevice\nmode\n Open the specified device using the
indicated mode. device is a full
pathname, and mode is an ASCII
representation of a decimal number
suitable for passing to open(9E). If
a device is already open, it is
closed before a new open is per-
formed.
Rcount\n Read count bytes of data from the
open device. rmt performs the
requested read(9E) and responds with
Acount-read\n if the read was suc-
cessful; otherwise an error in
standard format is returned.
If the read was successful, the
data read is sent.
Wcount\n Write data onto the open device. rmt
reads count bytes from the connec-
tion, aborting if a premature EOF is
encountered.
The response value is returned from
the write(9E) call.
Any other command causes rmt to exit.
SunOS 5.10 Last change: 6 Nov 2000 2
System Administration Commands rmt(1M)
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWrcmdc |
|_____________________________|_____________________________|
SEE ALSO
ufsdump(1M), ufsrestore(1M), intro(3), ioctl(2), lseek(2),
perror (3C), rcmd(3SOCKET), rexec(3SOCKET), attributes(5),
mtio(7I), open(9E), read(9E), write(9E)
DIAGNOSTICS
All responses are of the form described above.
BUGS
Do not use this for a remote file access protocol.
SunOS 5.10 Last change: 6 Nov 2000 3
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This page was generated on Wed Sep 12 11:26:23 GMT 2007
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