Unix/Linux Go Back    


BSD 2.11 - man page for rmt (bsd section 8)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


RMT(8)											   RMT(8)

NAME
       rmt - remote magtape protocol module

SYNOPSIS
       rmt

DESCRIPTION
       Rmt  is	a program used by the remote dump and restore programs 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 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(2)  and  error-
       message is the corresponding error string as printed from a call to perror(3).  The proto-
       col 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 path-
		      name  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  connec-
		      tion,  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 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 val-
		      ues 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.

4.2 Berkeley Distribution		November 17, 1996				   RMT(8)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 01:57 AM.