1rmt(1M) System Administration Commands rmt(1M)
2
6 rmt - remote magtape protocol module
7
9 /usr/sbin/rmt
10
13 rmt is a program used by the remote dump and restore programs in manip‐
14 ulating a magnetic tape drive through an interprocess communication
15 connection. rmt is normally started up with an rexec(3SOCKET) or
16 rcmd(3SOCKET) call.
17 The rmt program accepts requests that are specific to the manipulation
20 of magnetic tapes, performs the commands, then responds with a status
21 indication. All responses are in ASCII and in one of two forms. Suc‐
22 cessful commands have responses of:
23 Anumber\n where number is an ASCII representation of a decimal num‐
29 ber.
30 Unsuccessful commands are responded to with:
34 Eerror-number\nerror-message\n
36 where error-number is one of the possible error numbers described
38 in intro(3), and error-message is the corresponding error string as
39 printed from a call to perror(3C).
40 The protocol consists of the following commands:
44 S\n Return the status of the open device, as
46 obtained with a MTIOCGET ioctl call. If the
47 operation was successful, an "ack" is sent
48 with the size of the status buffer, then the
49 status buffer is sent (in binary).
50 Cdevice\n Close the currently open device. The device
53 specified is ignored.
54 Ioperation\ncount\n Perform a MTIOCOP ioctl(2) command using the
57 specified parameters. The parameters are
58 interpreted as the ASCII representations of
59 the decimal values to place in the mt_op and
60 mt_count fields of the structure used in the
61 ioctl call. When the operation is successful
62 the return value is the count parameter.
63 Loffset\nwhence\n Perform an lseek(2) operation using the speci‐
66 fied parameters. The response value is
67 returned from the lseek call.
68 Odevice\nmode\n Open the specified device using the indicated
71 mode. device is a full pathname, and mode is
72 an ASCII representation of a decimal number
73 suitable for passing to open(9E). If a device
74 is already open, it is closed before a new
75 open is performed.
76 Rcount\n Read count bytes of data from the open device.
79 rmt performs the requested read(9E) and
80 responds with Acount-read\n if the read was
81 successful; otherwise an error in standard
82 format is returned. If the read was success‐
83 ful, the data read is sent.
84 Wcount\n Write data onto the open device. rmt reads
87 count bytes from the connection, aborting if a
88 premature EOF is encountered. The response
89 value is returned from the write(9E) call.
90 Any other command causes rmt to exit.
94
96 See attributes(5) for descriptions of the following attributes:
97 ┌─────────────────────────────┬─────────────────────────────┐
102 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
103 ├─────────────────────────────┼─────────────────────────────┤
104 │Availability │SUNWrcmdc │
105 └─────────────────────────────┴─────────────────────────────┘
106
108 ufsdump(1M), ufsrestore(1M), intro(3), ioctl(2), lseek(2), perror (3C),
109 rcmd(3SOCKET), rexec(3SOCKET), attributes(5), mtio(7I), open(9E),
110 read(9E), write(9E)
111
113 All responses are of the form described above.
114
116 Do not use this for a remote file access protocol.
117SunOS 5.11 6 Nov 2000 rmt(1M)