TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

DSKCHR [CALLI 45]
22.35 DSKCHR [CALLI 45]
FUNCTION
Returns the characteristics of a disk device. These characteristics
are needed to allocate storage efficiently on the disk.
CALLING SEQUENCE
MOVE ac, [XWD len,addr]
DSKCHR ac,
error return
skip return
addr:
SIXBIT
BLOCK
/name/
length-l
In the calling sequence, you can provide the following information:
o name is the SIXBIT name of a file structure, a controller
type, a controller, a logical unit, a physical unit, a
physical device, or a channel number.
o
length-l is the number of words in the argument list.
If more than one unit was specified, the monitor returns values in the
ac and the argument block, pertinent to the first unit specified. If
more than one file structure was specified, the monitor returns values
in the ac and argument block, pertinent to the first unit on the first
file structure.
SKIP RETURN
On a successful return, the disk characteristics are returned in
addr+l through addr+, and disk status flags are returned in
the ac.
The contents of the returned argument block are:
Word
o
1
Symbol
. DCNAM
. DCUFT
Contents
The argument supplied for the call. This is the
only word in the argument block that the user
program supplies. The .DCNAM argument may be a
channel number.
The number of blocks left in your job's quota
before the UED is exhausted. If this value is
negative (DC.NPA==lBO), the UFD has not been
accessed since the job logged in, and the quota is
not available. To obtain this information for
jobs other than your own, use the .DUFRE function
of the DISK. UUO.
2
. DCFCT
The number ot first-come,
available to all users.
first-served blocks
3
. DCUNT
The number of blocks available to all users on
this file structure.
4
. DCSNM
SIXBIT name of the structure to which
belongs.
this unit
22-93