sg_read_buffer man page on DragonFly
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SG_READ_BUFFER(8) SG3_UTILS SG_READ_BUFFER(8)
NAME
sg_read_buffer - send SCSI READ BUFFER command
SYNOPSIS
sg_read_buffer [--help] [--hex] [--id=ID] [--length=LEN] [--mode=MO]
[--offset=OFF] [--raw] [--readonly] [--verbose] [--version] DEVICE
DESCRIPTION
Sends a SCSI READ BUFFER command to the DEVICE, and if there is a
response either decodes it, prints it in hexadecimal or sends it in
binary to stdout. If a response is received for a "descriptor" mode
then, in the absence of --hex and --raw, it is decoded. Response for
non-descriptor modes are output in hexadecimal unless the --raw option
is given.
OPTIONS
Arguments to long options are mandatory for short options as well.
-h, --help
output the usage message then exit. If used multiple times also
prints the mode names and their acronyms.
-H, --hex
output the response in hexadecimal. When given twice the
response is output in hex with the corresponding representation
in ASCII to the right of each line.
-i, --id=ID
this option sets the buffer id field in the cdb. ID is a value
between 0 (default) and 255 inclusive.
-l, --length=LEN
where LEN is the length, in bytes, that is placed in the "allo‐
cation length" field in the cdb. The default value is 4 (bytes).
The device may respond with less bytes.
-m, --mode=MO
this option sets the mode field in the cdb. MO is a value
between 0 (default) and 31 inclusive. Alternatively an abbrevia‐
tion can be given. See the MODES section below. To list the
available mode abbreviations use an invalid one (e.g.
'--mode=xxx'). As an example, to fetch the read buffer descrip‐
tor give '--mode=desc' .
-o, --offset=OFF
this option sets the buffer offset field in the cdb. OFF is a
value between 0 (default) and 2**24-1 . It is a byte offset.
-r, --raw
if a response is received then it is sent in binary to stdout.
-R, --readonly
open the DEVICE read-only (e.g. in Unix with the O_RDONLY flag).
The default is to open it read-write.
-v, --verbose
increase the level of verbosity, (i.e. debug output).
-V, --version
print the version string and then exit.
MODES
Following is a list of READ BUFFER command settings for the MODE field.
First is an acronym accepted by the MO argument of this utility. Fol‐
lowing the acronym in square brackets are the corresponding decimal and
hex values that may also be given for MO. The following are listed in
numerical order.
hd [0, 0x0]
Combined header and data (obsolete in SPC-4).
vendor [1, 0x1]
Vendor specific.
data [2, 0x2]
Data.
desc [3, 0x3]
Descriptor: yields 4 bytes that contain an offset boundary field
(1 byte) and buffer capacity (3 bytes).
echo [10, 0xa]
Read data from echo buffer (was called "Echo buffer" in SPC-3).
echo_desc [11, 0xb]
Echo buffer descriptor: yields 4 bytes of which the last (low‐
est) 13 bits represent the echo buffer capacity. The maximum
echo buffer size is 4096 bytes.
en_ex [26, 0x1a]
Enable expander communications protocol and Echo buffer. Made
obsolete in SPC-4.
err_hist [28, 0x1c]
Error history. Introduced in SPC-4.
NOTES
All numbers given with options are assumed to be decimal. Alterna‐
tively numerical values can be given in hexadecimal preceded by either
"0x" or "0X" (or has a trailing "h" or "H").
EXIT STATUS
The exit status of sg_read_buffer is 0 when it is successful. Otherwise
see the sg3_utils(8) man page.
AUTHORS
Written by Luben Tuikov and Douglas Gilbert.
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright © 2006-2014 Luben Tuikov and Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSO
sg_write_buffer(sg3_utils)
sg3_utils-1.39 May 2014 SG_READ_BUFFER(8)
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