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Notes: CPS/SDS/035
Names: »2089A «
Derivation
└─⟦a5d18cecd⟧ Bits:30006104 8" Wang WCS floppy, CR 0164A
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WangText
$…0a…$…0e…$…86…1
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…02…CPS/SDS/035
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SUPERVISOR
VDU
DETAILED
DESIGN
SPECIFICATION…02…ISSUE
1…02…CAMPS
4.2.4 Volume Deletion Subpackage (VODL) ......
4.2.4.1 Functional Specification ...........
4.2.4.1.1 Command Interpretation and Proce
4.2.4.1.2 Volume Deletion (2.0) ..........
4.2.4.1.3 Error Handling .................
4.2.4.2 Software Structure .................
4.2.4.3 Data Flow and Control Logic ........
4.2.4.4 Module Description .................
4.2.4.4.1 VODL Main ......................
4.2.4.4.2 Report to CREP .................
4.2.4.4.3 VODL START .....................
4.2.4.4.4 CLEAN VODL .....................
4.2.4.4.5 Analyse VODL Result ............
4.2.4.4.6 Find and Delete Next File ......
4.2.4.4.7 Volume Mount/Dismount ..........
4.2.4.5 Common Subpackage Data .............
4.2.4.6 Common Subpackage Procedures .......
4.2.4.6.1 Fetch Next File ................
4.2.4.6.2 Remove This File ...............
4.2.4.6.3 Purge Next File ................
4.2.4.7 Subpackage Interfaces ..............
4.2.4.7.1 SVCO VODL Intefaces ............
4.2.4.7.2 VODL SVCO Interface ............
4.2.4.7.3 SFCO VODL Interface ............
4.2.4.7.4 VODL SFCO Interface ............
4.2.4 V̲o̲l̲u̲m̲e̲ ̲D̲e̲l̲e̲t̲i̲o̲n̲ ̲S̲u̲b̲p̲a̲c̲k̲a̲g̲e̲ ̲(̲V̲O̲D̲L̲)̲
The Subpackage VODL deletes an entire volume on command
from SFCO. Deletion of a volume is time a consuming
task, and therefore this task has been assigned a coroutine.
VODL is running independent of user sign on sign off
as is CREP. When SSC issues a Close Down Command to
SUP, VODL receives a Close Command directly from SVCO.
4.2.4.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The following functions are included in the package:
- SVCO Command Process
- SFCO Command Interpretation
- Deletion of all non-system files on the volume
by the of DAMOS procedure "Purge-file".
- Error Handling.
Figure 4.2.4.1-1 presents the functional breakdown.
FIGURE 4.2.4.1-1
FUNCTIONAL BREAKDOWN OF VODL
4.2.4.1.1 C̲o̲m̲m̲a̲n̲d̲ ̲I̲n̲t̲e̲r̲p̲r̲e̲t̲a̲t̲i̲o̲n̲ ̲a̲n̲d̲ ̲P̲r̲o̲c̲e̲s̲s̲i̲n̲g̲
The VODL Coroutine receives commands from the coroutines
SVCO and SFCO. A received command is checked for validity
and if invalid a proper action is taken.
Command received from SVCO (Controlling Commands) takes
precedence over and shall interrupt commands received
from SFCO.
Execution of the time consuming SFXO Command is therefore
controlled in such a way that the execution can be
terminated within a reasonable time.
4.2.4.1.2 V̲o̲l̲u̲m̲e̲ ̲D̲e̲l̲e̲t̲i̲o̲n̲ ̲(̲2̲.̲0̲)̲
The functions to delete a volume includes:
a) Mount of Volume
b) Deletion of each file on the volume (Purge File)
c) Dismount of Volume
d) Generation of a command completion report for print
out at the supervisor report printer (Report Deletion
Buffer)
4.2.4.1.3 E̲r̲r̲o̲r̲ ̲H̲a̲n̲d̲l̲i̲n̲g̲
Error Handling for VODL copes with the following error
categories:
a) Illegal answer from SSC to a mount/dismount request.
This is categorised as a queue error.
b) Illegal command from SVCO or SFCO, or command received
from SFCO before execution of the previous has
been completed. This is categorised as an Internal
Error,
c) Completion codes received as a result of an IO
Procedure Call of a nature that prevents the commanded
task to be completed. This is categorised as an
I/O Error.
Queue Errors and Internal Errors are reported by using
the CAMPS standard error handling reporting facilities.
I/O Errors of a non-fatal nature are reported through
the command completion reports, printed on the supervisor
report printer.
4.2.4.2 S̲o̲f̲t̲w̲a̲r̲e̲ ̲S̲t̲r̲u̲c̲t̲u̲r̲e̲
VODL consists of 7 modules. The VODL coroutine receives
input from SVCO and SFCO through the operation semaphore
VODL ̲SEM. Answers to SVCO commands are signalled to
the SVCO operation semaphore SVCO ̲SEM, and answers
to SFCO commands to the SFCO operation semaphore SFCO
̲SEM.
An overview of the VODL coroutine is shown in fig.
4.2.4.2-1.
FIGURE 4.2.4.2-1
VODL SOFTWARE STRUCTURE
4.2.4.3 D̲a̲t̲a̲ ̲F̲l̲o̲w̲ ̲a̲n̲d̲ ̲C̲o̲n̲t̲r̲o̲l̲ ̲L̲o̲g̲i̲c̲
4.2.4.4 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
4.2.4.4.1 V̲O̲D̲L̲ ̲M̲a̲i̲n̲
4.2.4.4.1.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The purpose of this module is to analyse the input
of the coroutine and from this performs the volume
deletion as background job.
4.2.4.4.1.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) VODL ̲MAIN
b) VODL ̲MAIN (R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.1.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.1.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Packages Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
VODEL ̲STATE C R
VODL ̲SEM - -
SVCO ̲SEM - -
SFCO ̲SEM - -
SFCO ̲CMD ̲PT - R
SVCO ̲CMD ̲PT - R
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing.
4.2.4.4.1.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
VODL Main contains the waiting point of the coroutine.
In this waiting point commands from SVCO and SFCO are
awaited, further the completion of purging of a file
is awaited and treated.
4.2.4.4.2 R̲e̲p̲o̲r̲t̲ ̲t̲o̲ ̲C̲R̲E̲P̲
4.2.4.4.2.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The module creates and sends a completion report to
the SVUP Queue CREPQ.
4.2.4.4.2.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) REPORT ̲TO ̲CREP (COMPLETION:INTEGER)
b) REPORT ̲TO ̲CREP (R0,R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 COMPLETION:INTEGER C D
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.2.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.2.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
SFCO ̲CMD ̲PT C D
SVUP ̲SNED ̲PARAMS - D
SVUP ̲SEND ̲Q - D
SFCO ̲SEM - -
VODEL ̲STATE - R
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing.
4.2.4.4.2.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The original issued command and the completion code
is sent to CREP in a QEL referencing a buffer.
The Volume Name is set in the buffer and the QEL is
submitted. Finally the SFCO ̲CMD is returned to SFCO
and VODEL ̲STATE is set to IDLE.
4.2.4.4.3 V̲O̲D̲L̲ ̲S̲T̲A̲R̲T̲
4.2.4.4.3.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The procedure starts up the actual command.
4.2.4.4.3.1 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) VODL ̲START
b) VODL ̲START (R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.3.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.3.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
VODL ̲VOLUME C K
CUR ̲LEVL - R
CUR ̲FILE - R
VODL ̲STATE - R
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing.
4.2.4.4.3.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The Volume is mounted and the main directory is opened.
The first four files are then read (skipped) and processing
can then start.
4.2.4.4.4 C̲L̲E̲A̲N̲ ̲V̲O̲D̲L̲
4.2.4.4.4.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The procedure cleans up after VODL.
4.2.4.4.4.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) CLEAN ̲VODL
b) CLEAN ̲VODL (R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.4.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.4.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
CUR ̲LEVEL C R
CUR ̲FILE C R
VODL ̲VOLUME C K
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing
4.2.4.4.4.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The module dismantles all files open and dismounts
the volume.
4.2.4.4.5 A̲n̲a̲l̲y̲s̲e̲ ̲V̲O̲D̲L̲ ̲R̲e̲s̲u̲l̲t̲
4.2.4.4.5.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The Module analyses the result of finished purging.
4.2.4.4.5.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) ANALYSE ̲VODL ̲RESULT(COROUTINE ̲OP:TEP ̲COROUTINE
̲OP)
b) ANALSE ̲VODL ̲RESULT (R5,R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R5 COROUTINE ̲OP C D
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.5.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.5.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
None
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing.
4.2.4.4.5.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The result is obtained. If Error, the procedure sends
error report to CREP and goes in IDLE STATE.
4.2.4.4.6 F̲i̲n̲d̲ ̲a̲n̲d̲ ̲D̲e̲l̲e̲t̲e̲ ̲N̲e̲x̲t̲ ̲F̲i̲l̲e̲
4.2.4.4.6.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The procedure initiates the next file purging.
4.2.4.4.6.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) FIND ̲AND ̲DELETE ̲NEXT ̲FILE
b) FIND ̲AND ̲DELETE ̲NEXT ̲FILE (R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R6 LINK C D
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.4.6.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
None
4.2.4.4.6.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
VODL ̲VOLUME C R
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing
4.2.4.4.6.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The module finds the next file to be purged. If found,
it returns. If error, it cleans up and sends error
report to CREP. If no more files are found, it cleans
up, renames the volume and sends OK to CREP.
4.2.4.4.7 V̲o̲l̲u̲m̲e̲ ̲M̲o̲u̲n̲t̲/̲D̲i̲s̲m̲o̲u̲n̲t̲
4.2.4.4.7.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲S̲p̲e̲c̲i̲f̲i̲c̲a̲t̲i̲o̲n̲
The module sends a mount or dismount command to SSC,
depending on the value of the call register R0. The
identifiction of the voume to be mounted is contained
in R1.
After the command has been sent the module awaits the
SSC response to the command. The QEL receivd is validated
upon receipt and when the correct QEL has been received,
the CC of the mount/dismount command is returned in
R7 to the caller.
4.2.4.4.7.2 M̲o̲d̲u̲l̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
a) V ̲MOUNT ̲DISMOUNT(COMMAND ̲INTEGER,
POINTER TO COLUME NAME:POINTER,
COMPLETION CODE:INTEGER):
ERROR ̲OK
b) V ̲MOUNT ̲DISMOUNT(R0,R1,R7,R6):ERROR ̲OK
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
a) C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 MOUNT ̲VOL,DISMOUNT ̲VOL C D
R1 POINTER TO VOLUME NAME C D
R7 COMPLETION CODE - CC - R
R6 LINK C K
b) R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R5 DEST
R6 LINK KEPT
R7 COMPLETION CODE CC RETURNED
4.2.4.4.7.3 M̲o̲d̲u̲l̲e̲ ̲C̲o̲m̲p̲o̲n̲e̲n̲t̲s̲
4.2.4.4.7.3.1 C̲H̲E̲C̲K̲ ̲Q̲E̲L̲
The procedure checks whether the QEL received is the
one expected and whether it is valid.
4.2.4.4.7.4 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data
Refer VODL Subpackage Data
SVUP ̲SEND ̲Q - D
SVUP ̲ARRQ C K
SVUP ̲SEND ̲PARAMS - D
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing
4.2.4.4.7.5 M̲o̲d̲u̲l̲e̲ ̲D̲e̲s̲i̲g̲n̲
The Mount/Dismout Request is sent to the SSC System
Queue, the answer is received in the SUP RETR Queue.
4.2.4.5 C̲o̲m̲m̲o̲n̲ ̲S̲u̲b̲p̲a̲c̲k̲a̲g̲e̲ ̲D̲a̲t̲a̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUP Package Data Source Listing.
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer VODL Subpackage Data Source Listing
4.2.4.6 C̲o̲m̲m̲o̲n̲ ̲S̲u̲b̲p̲a̲c̲k̲a̲g̲e̲ ̲P̲r̲o̲c̲e̲d̲u̲r̲e̲s̲
4.2.4.6.1 F̲e̲t̲c̲h̲ ̲N̲e̲x̲t̲ ̲F̲i̲l̲e̲
4.2.4.6.1.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The procedure reads the next file entry in currently
open directory. It FIRST ̲TIME, file address is zeroed,
otherwise it is read from the end of the last reading.
Free entries in the directory are skipped.
4.2.4.6.1.2 I̲n̲t̲e̲r̲f̲a̲c̲e̲ ̲D̲e̲f̲i̲n̲i̲t̲i̲o̲n̲
a) FETCH ̲NEXT ̲FILE (FIRST ̲TIME:BOOLEAN) ̲ERROR ̲OK
b) FETCH ̲NEXT ̲FILE (R0,R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 FIRST ̲TIME:BOOLEAN C D
R6 LINK C D
R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.6.1.3 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer VODL Subpackage Data
CUR ̲FILE C R
VODL ̲BUFFER C K
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing
4.2.4.6.1.4 P̲r̲o̲c̲e̲d̲u̲r̲e̲ ̲D̲e̲s̲i̲g̲n̲
If FIRST ̲TIME, FIRST ̲BYTE is set to zero and BYTE ̲COUNT
is set to 16. Then the directory record is read and
FIRST ̲BYTE in incremented. This goes on, until EOF
is encountered or a used entry is found. Error EOF,
procedure returns to error, otherwise the file name
is put in next entry in FILE ̲ARRAY and procedure returns
to OKAY.
4.2.4.6.2 R̲e̲m̲o̲v̲e̲ ̲T̲h̲i̲s̲ ̲F̲i̲l̲e̲
4.2.4.6.2.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The procedure removes the file in the stack-top.
4.2.4.6.2.2 I̲n̲t̲e̲r̲f̲a̲c̲e̲ ̲D̲e̲f̲i̲n̲i̲t̲i̲o̲n̲
a) REMOVE ̲THIS ̲FILE
b) REMOVE ̲THIS ̲FILE (R6)
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R6 LINK C D
R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R7 DEST
4.2.4.6.2.3 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer VODL Subpackage Data
CUR ̲FILE C R
CUR ̲LEVL C R
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing
4.2.4.6.2.4 P̲r̲o̲c̲e̲d̲u̲r̲e̲ ̲D̲e̲s̲i̲g̲n̲
The FDCB is dismantled and the file is removed from
the Directory. The current file level ID decremented.
4.2.4.6.3 P̲u̲r̲g̲e̲ ̲N̲e̲x̲t̲ ̲F̲i̲l̲e̲
4.2.4.6.3.1 F̲u̲n̲c̲t̲i̲o̲n̲a̲l̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The procedure gets next file in directory and purges
it.
4.2.4.6.3.2 I̲n̲t̲e̲r̲f̲a̲c̲e̲ ̲D̲e̲f̲i̲n̲i̲t̲i̲o̲n̲
a) PURGE ̲NEXT ̲FILE()(CC:INTEGER):FILE ̲EXIT
b) PURGE ̲NEXT ̲FILE (R7, R6): FILE ̲EXIT
R̲e̲g̲i̲s̲t̲e̲r̲ ̲C̲o̲n̲v̲e̲n̲t̲i̲o̲n̲
C̲a̲l̲l̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R7 CC - R
R6 LINK C D
R̲e̲t̲u̲r̲n̲ ̲R̲e̲g̲i̲s̲t̲e̲r̲s̲
R0 - R6 DEST
R7 CC - R
4.2.4.6.2.3 D̲a̲t̲a̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
a) D̲a̲t̲a̲ ̲R̲e̲f̲e̲r̲e̲n̲c̲e̲s̲
Refer CPS Prefixes
Refer SUP Package Prefixes
Refer VODL Subpackage Prefixes
b) E̲x̲t̲e̲r̲n̲a̲l̲ ̲D̲a̲t̲a̲
Refer SUB Package Data
Refer VODL Subpackage Data
CUR ̲LEVL C R
CUR ̲FILE C R
VODEL ̲SEM - -
c) L̲o̲c̲a̲l̲ ̲D̲a̲t̲a̲
Refer Source Listing.
4.2.4.6.3.4 P̲r̲o̲c̲e̲d̲u̲r̲e̲ ̲D̲e̲s̲i̲g̲n̲
If EOF, the directory is closed and file level is decremented.
If it was the main directory (level 0), procedure returns
to finished, otherwise the 'EOF'- directory is removed
from the current directory, and search continues on
this.
If a file is found, this is opened and the organization
is found. If it is a directory, level is checked. If
level overflow, the procedure returns, otherwise search
continues on next level.
If it is a file, purging is initiated and associated
to the semaphore.
4.2.4.7 S̲u̲b̲p̲a̲c̲k̲a̲g̲e̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
4.2.4.7.1 S̲V̲C̲O̲ ̲V̲O̲D̲L̲ ̲I̲n̲t̲e̲f̲a̲c̲e̲s̲
The following commands are sent from SVCO to VODL via
the operation sempahore VODL ̲SEM:
CLOSEVODL
4.2.4.7.2 V̲O̲D̲L̲ ̲S̲V̲C̲O̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲
The following ansers to commands are sent from VODL
to SVCO via the operation semaphore SVCO ̲SEM:
Answer to CLOSE VODL command.
4.2.4.7.3 S̲F̲C̲O̲ ̲V̲O̲D̲L̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲
The following commands are sent from SFCO to VODL via
the operation semaphore VODL ̲SEM:
Volume Delete (VODL)
4.2.4.7.4 V̲O̲D̲L̲ ̲S̲F̲C̲O̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲
The following answers to commands are sent from VODL
to SFCO via the operation semaphore SFCO ̲SEM:
Answer to VODL command.
