Developer's Daily | Unix by Example |
main | java | perl | unix | dev directory | web log |
RMT(8) BSD System Manager’s Manual 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 Number is an ASCII representation of a decimal number. Unsuccessful commands are responded to with: |
Eerror-number\nerror-message\n
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 ’\n’ indicates that a newline should be supplied:
Odevice\nmode\n
Open the specified deviceusing the indicated mode.Deviceis a full pathname and modeis an ASCIIrepresentation 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. Cdevice\n Lwhence\noffset\n Wcount\n Rcount\n Ioperation\ncount\n 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 should be discouraged from using this for a remote file access protocol. |
AUTHOR
The dump/restore backup suit was ported to Linux’s Second Extended File System by Remy Card <card@Linux.EU.Org>. He maintained the initial versions of dump (up and including 0.4b4, released in january 1997). Starting with 0.4b5, the new maintainer is Stelian
Pop |
AVAILABILITY
The dump/restore backup suit is available from |
HISTORY
The rmt command appeared in 4.2BSD. rmt 0.4b19 August 20, 2000 rmt 0.4b19 |