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rmt(8c) [ultrix man page]

rmt(8c) 																   rmt(8c)

Name
       rmt - remote mass storage device protocol module

Syntax
       /etc/rmt

Description
       The  program  is  used  by the remote dump and restore programs to manipulate remote mass storage devices and files through an interprocess
       communication connection.  The program is normally started with an or call.

       The program remotely ties its standard input and output to a socket, accepts commands that manipulate remote devices or files, performs the
       commands,  and  then  responds with a status indication.  All commands and responses are in ASCII and in one of two forms.  Successful com-
       mands have responses of an acknowledgement (ack) such as:

	    Anumber


       In this example, number is an ASCII representation of a decimal number.	Unsuccessful commands are responded to with the following:

	    Eerror-number
error-message
,

       In this example, error-number is one of the possible error numbers described in and error-message is  the  corresponding  error	string	as
       printed from a call to The protocol is comprised of the following commands (a newline (
) is present between each token):

       O device mode	Open  the specified device using the indicated mode.  The device is a full pathname and mode is an ASCII representation of
			a decimal number suitable for passing to If a device had already been opened, it is closed before a new open is performed.
			Device can be a regular file.

       C device 	Close the currently open device or file.  The device specified is ignored.

       D		Returns generic device information for the open device. A DEVIOCGET call is performed and the data returned. If the opera-
			tion is successful, an ``ack'' is sent with the size of the information buffer.

       L whence offset	Perform an operation using the specified parameters.  The response value is that returned from the call.

       P		Returns disk partition information of the open device. A DIOCDGTPT call is performed and the data returned. If the  opera-
			tion is successful, an ``ack'' is sent with the size of the information buffer.

       T filename	Returns  file  status  information  for the specified file. A call is performed and the data returned. If the operation is
			successful, an ``ack'' is sent with the size of the information buffer.

       W count		Write data onto the open device.  The program reads count bytes from the connection, aborting if a  premature  end-of-file
			is  encountered.   The response value is that returned from the call.  If the operation was successful, an ``ack'' is sent
			containing the number of bytes written.

       R count		Read count bytes of data from the open device.	If count exceeds the size of the data buffer (10 kilobytes), it  is  trun-
			cated  to  the	data buffer size.  The program then performs the requested and responds with Acount-read
 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.

       I operation count
			Perform a MTIOCTOP 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 call.  The return value  is  the
			count parameter when the operation is successful.

       S		Return	the  status  of the open device, as obtained with a MTIOCGET 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).

       Any other command causes to exit.

Restrictions
       Do not use for a remote file access protocol.

Diagnostics
       All responses are of the form described above.

See Also
       rcmd(3x), rexec(3x), mtio(4), rdump(8c), rrestore(8c)

																	   rmt(8c)

Check Out this Related Man Page

RMT(8)							    BSD System Manager's Manual 						    RMT(8)

NAME
rmt -- remote magtape protocol module SYNOPSIS
rmt DESCRIPTION
The rmt utility is used by the remote dump and restore programs in manipulating a magnetic tape drive through an interprocess communication connection. It is normally started up with an rcmd(3) call. The rmt utility accepts requests specific to the manipulation of magnetic tapes, performs the commands, then responds with a status indica- tion. All responses are in ASCII and in one of two forms. Successful commands have responses of: Anumber Number is an ASCII representation of a decimal number. Unsuccessful commands are responded to with: Eerror-number error-message Error-number is one of the possible error numbers described in intro(2) and error-message is the corresponding error string as printed from a call to 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 ' ' indicates that a newline should be supplied: Odevice mode Open the specified device using the indicated mode. Device is a full pathname and mode is an ASCII representation of a decimal num- ber suitable for passing to open(2). If a device had already been opened, it is closed before a new open is performed. Cdevice Close the currently open device. The device specified is ignored. Lwhence offset Perform an lseek(2) operation using the specified parameters. The response value is that returned from the lseek(2) call. Wcount Write data onto the open device. The rmt utility reads count bytes from the connection, aborting if a premature end-of-file is encountered. The response value is that returned from the write(2) call. Rcount Read count bytes of data from the open device. If count exceeds the size of the data buffer (10 kilobytes), it is truncated to the data buffer size. The rmt utility then performs the requested read(2) and responds with Acount-read 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. Ioperation count 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(2) call. The return value is the count parameter when the operation is successful. S Return the status of the open device, as obtained with a MTIOCGET ioctl(2) 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). Any other command causes rmt to exit. DIAGNOSTICS
All responses are of the form described above. SEE ALSO
rcmd(3), mtio(4), rdump(8), rrestore(8) HISTORY
The rmt utility appeared in 4.2BSD. BUGS
People should be discouraged from using this for a remote file access protocol. BSD
June 1, 1994 BSD

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