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rmt(8) [bsd man page]

RMT(8)							      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 indica- tion. All responses are in ASCII and in one of two forms. Successful commands have responses of Anumber where number is an ASCII representation of a decimal number. Unsuccessful commands are responded to with Eerror-number error-message , 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 protocol 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 dec- imal number suitable for passing to open(2). If a device had already been opened, it is closed before a new open is per- formed. 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 encoun- tered. 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 if the read was success- ful; 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 representa- tions 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. 4.2 Berkeley Distribution November 17, 1996 RMT(8)

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rmt(1M) 						  System Administration Commands						   rmt(1M)

NAME
rmt - remote magtape protocol module SYNOPSIS
/usr/sbin/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(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 sta- tus indication. All responses are in ASCII and in one of two forms. Successful commands have responses of: Anumber where number is an ASCII representation of a decimal number. Unsuccessful commands are responded to with: Eerror-number error-message 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 perror(3C). The protocol consists of the following commands: 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). Cdevice Close the currently open device. The device specified is ignored. Ioperation count Perform a MTIOCOP ioctl(2) command using the specified parameters. The parameters are interpreted as the ASCII rep- resentations 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 whence Perform an lseek(2) operation using the specified parameters. The response value is returned from the lseek call. Odevice 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(9E). If a device is already open, it is closed before a new open is performed. Rcount Read count bytes of data from the open device. rmt performs the requested read(9E) and responds with Acount-read if the read was successful; otherwise an error in standard format is returned. If the read was successful, the data read is sent. Wcount Write data onto the open device. rmt reads count bytes from the connection, aborting if a premature EOF is encoun- tered. The response value is returned from the write(9E) call. Any other command causes rmt to exit. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWrcmdc | +-----------------------------+-----------------------------+ SEE ALSO
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) DIAGNOSTICS
All responses are of the form described above. BUGS
Do not use this for a remote file access protocol. SunOS 5.10 6 Nov 2000 rmt(1M)

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