.TH SCUZZ 8
.SH NAME
scuzz \- SCSI target control
.SH SYNOPSIS
.B scuzz
[
.B -q
]
[
.I target-id
]
.SH DESCRIPTION
.I Scuzz
is an interactive program for exercising
raw SCSI devices.
It reads commands from standard input and applies them to a SCSI target.
If
.I target-id
is given on the command line, an
.B open
(see below)
is immediately applied to the target.
On successful completion of a command,
.BI ok " n
is printed, where
.I n
is the number of bytes transferred to/from the target;
the
.B -q
command line option suppresses the 
.B ok
message.
.SS Commands
.TP
.BI help " command
.B Help
is rudimentary and prints a one line synopsis for the named
.IR command ,
or for all commands if no argument is given.
.TP
.B probe
.B Probe
attempts an
.B inquiry
command on all SCSI target ids,
and prints the result preceded by the id of those
targets which respond.
.LP
The
.B help
and
.B probe
commands may be given at any time.
.TP
.BI open " target-id
.B Open
must be given before any of the remaining commands will be accepted.
Internally,
.B open
issues
.B ready
then
.BR inquiry ,
followed by a device class-specific command to determine the
logical block size of the target.
.TP
.B close
.B Close
need only be given if another target is to be opened in the current
session.
.LP
The remaining commands are in two groups,
generic SCSI commands,
and those specific to the Philips CDD521 Compact Disc Recorder
.RB ( flushcache
onwards).
With the exception of the
.BR read ,
.BR write ,
.BR space ,
and
.B wtrack
commands,
all arguments are in the style of ANSI-C integer constants.
.TP
.B ready
Test Unit Ready
checks if the unit is powered up and ready to do
.B read
and 
.B write
commands.
.TP
.B rezero
Rezero
Unit requests that a disc be brought to a known state,
usually by seeking to track zero.
.TP
.B rewind
Rewind
positions a tape at the beginning of current partition
(there is usually only one partition, the beginning of tape).
.TP
.B reqsense
Request Sense retrieves Sense Data concerning an error or
other condition and is usually issued following the completion of a command
that had check-condition status.
.I Scuzz
automatically issues a
.B reqsense
in response to a check-condition status and prints the result.
.TP
.B format
Format
Unit performs a ``low level'' format of a disc.
.TP
.B rblimits
Read Block Limits
reports the possible block lengths for the logical unit. Tapes only.
.TP
.BI read " file nbytes
.B Read
transfers data from the target to the host.
A missing
.I nbytes
causes the entire device to be read.
.TP
.BI write " file nbytes
.I Write
transfers data from the host to the target.
A missing
.I nbytes
causes the entire input file to be transferred.
.IP
The first argument to the
.BR read ,
.BR write ,
and
.B wtrack
(q.v.)
commands specifies a source
.RB ( write
and
.BR wtrack )
or destination
.RB ( read )
for the I/O.
The argument is either a plain file name or
.B |
followed by a command to be executed by
.IR rc (1).
The argument may be quoted in the style of
.IR rc (1).
.TP
.BI seek " offset whence
.I Seek
requests the target to seek to a position on a disc,
arguments being in the style of
.IR seek (2);
.I whence
is 0 by default.
.IP
.I Scuzz
maintains an internal notion of where the current target
is positioned.
The
.BR seek ,
.BR read ,
.BR write ,
.BR rewind ,
.BR rezero ,
and
.B wtrack
commands all manipulate the internal offset.
.TP
.BI filemark " howmany
Write Filemarks
writes one (default) or more filemarks on a tape.
.TP
.BI space\ [-b]\ [-f]\ [[--] howmany ]
.I Space
positions a tape forwards or backwards.
The arguments
specify logical block
.RB ( -b )
or
filemark
.RB ( -f )
spacing;
default is
.BR -b .
If
.I howmany
is negative
it specifies spacing backwards,
and should be preceded by
.B --
to turn off any further
option processing.
Default is 1.
.TP
.B inquiry
Inquiry
is issued to determine the device type of a particular target,
and to determine some basic information about the implemented options and
the product name.
.TP
.BI modeselect " bytes...
Mode
Select
is issued to set variable parameters in the target.
.I Bytes
given as arguments comprise all the data for the target;
see an appropriate manual for the format.
.TP
.BI modesense\ [ page \ [ nbytes ]]
Mode
Sense
reports variable and fixed parameters from the target.
If no
.I page
is given,
all pages are returned.
.I Nbytes
specifies how many bytes should be returned.
.TP
.BI start " code
.TP
.BI stop " code
.TP
.BI eject " code
.BR Start ,
.BR stop ,
and
.B eject
are synonyms for Start/Stop Unit with different default values of
.IR code .
Start/Stop Unit is typically used to spin up and spin down a rotating
disk drive.
.I Code
is 0 to stop,
1 to start and
3 to eject (if the device supports ejection of the medium).
.TP
.B capacity
Read Capacity reports the number of blocks and the block
size of a disc.
.LP
The remaining commands are specific to the CDD521 Compact Disc Recorder.
A brief description of each is given; see the manual for details of arguments.
.TP
.B flushcache
The Flush Cache command forces data in the cache memory
of the CDD521 to be written to the physical medium.
.TP
.BI rdiscinfo\ [ track/session-number [ ses ]]
The Read TOC/PMA command transfers data from one of the tables of contents
(TOC or PMA) on the CD medium.
.TP
.BI fwaddr\ [ track [ mode [ npa\ \L]]]
The First Writeable Address command reports the next logical writeable address
for the next
.B write
command.
.TP
.BI treserve " nbytes
The Reserve Track command reserves one track on the disc.
Tracks can only be reserved in successive order.
.TP
.BI trackinfo " track
Read Track Info reports the starting
address, the length of a given track on the disc
and the number of free blocks in that track.
.TP
.BI wtrack file [ nbytes \ [ track \ [ mode ]]]
Write Track sets up for track-writing if 
.I nbytes
is 0 (default), or
writes a complete track.
See
.B write
above.
.TP
.B load
.TP
.B "unload
Load
and
Unload
open or close the tray.
.TP
.BI fixation\ [ toc-type ]
.I Fixation
writes table of contents (TOC) and LEADOUT information to the disc to
complete a session.


.SH FILES
.TF #S/scsi-target-id\/data
.TP
.B #S/\fIscsi-target-id\fP/cmd
raw SCSI interface for command and status.
.TP
.B #S/\fIscsi-target-id\fP/data
raw SCSI interface for I/O.
.SH "SEE ALSO"
.IR scsi (3)
.br
.IR "Small Computer System Interface - 2 (X3T9.2/86-109)" ,
Global Engineering Documents
.br
.IR "SCSI Command Set CDD521/10" ,
Philips IMS
.br
.IR "SCSI Bench Reference" ,
ENDL Publications
.SH BUGS
Only a limited subset of SCSI commands has been implemented (as needed).
.LP
Only one target can be open at a time.
.LP
LUNs other than 0 are not supported.
.LP
No way to force 6 or 10 byte commands.