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     rmt - remote magtape protocol module


     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:


         where number is an ASCII  representation  of  a  decimal

     Unsuccessful commands are responded to with:


         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

      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

     Cdevice\n               Close the currently open device.
                              The device specified is ignored.

     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-

     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
                              The response value is returned from
                             the write(9E) call.

     Any other command causes rmt to exit.

     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWrcmdc                   |

     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)

     All responses are of the form described above.

     Do not use this for a remote file access protocol.

Man pages from Solaris 10 Update 8. See docs.sun.com and www.oracle.com for further documentation and Solaris information.