# 2.11BSD#431 - /usr/man/cat8/rmt.0

    RMT(8)		    UNIX Programmer's Manual		   RMT(8)

    NAME
         rmt - remote magtape protocol module

    SYNOPSIS
         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(3) or rcmd(3) call.

         The rmt program accepts requests specific to the manipula-
         tion 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(2) and error-message is the corresponding
         error string as printed from a call to perror(3).	The pro-
         tocol is comprised of the following commands (a space is
         present between each token).

         O device mode  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(2).  If a device
    		    had already been opened, it is closed before
    		    a new open is performed.

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

         L whence offset
    		    Perform an lseek(2) operation using the
    		    specified parameters.  The response value is
    		    that returned from the lseek call.

         W count	    Write data onto the open device.  Rmt 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.

         R count	    Read count bytes of data from the open

    Printed 11/26/99	November 17, 1996			1

    RMT(8)		    UNIX Programmer's Manual		   RMT(8)

    		    device.  If count exceeds the size of the
    		    data buffer (10 kilobytes), it is truncated
    		    to the data buffer size.  Rmt then performs
    		    the requested read(2) and responds with
    		    Acount-read\n 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 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.  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 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), rexec(3), mtio(4), rdump(8), rrestore(8)

    BUGS
         People tempted to use this for a remote file access protocol
         are discouraged.

    Printed 11/26/99	November 17, 1996			2

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