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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
DOSSECT
Control Block Contents
DOSSECT DSECT
Cross Reference (Contains links to field and bit definitions)
DOSSECT Prolog
Name : DOSCB
Description: DOS Simulation Control Block
DSECT : DOSSECT
Function : DOSSECT simulates the CMS file control block
(FCB) in the CMS/DOS environment. DOSSECT is
called by the DOSCB macro. The DOS simulation
control blocks are chained together. The
DOSFIRST field in NUCON points to the first
DOSCB in the chain, or if no chain exists,
contains zero.
DOSSECT Control Block Content
DOSSECT DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DOSSECT DOS Simulation Control Block 0000 0 Bitstring 1 DOSINIT (0) DOSCB FLAG BYTE .1.. .... DOSOS X'40' CREATED BY 'OS' USER ..1. .... DOSDOS X'20' DEFINED FOR NON-CMS DISK ...1 .... DOSCMS X'10' DEFINED FOR CMS DISK .... 1... DOSDDCAT X'08' USER CATALOG DATASET .... .1.. DOSPERM X'04' PERMANENT CONTROL BLOCK .... ..1. DOSJCAT X'02' SEARCH VSAM JOB CATALOG .... ...1 DOSUCAT X'01' SEARCH VSAM USER CATALOG 0000 0 Address 4 DOSNEXT AL3(NEXT DOSCB) 0004 4 Character 4 DOSCBID 'DLBL' TO DISTINGUISH FROM CMSCB 0008 8 Character 8 DOSDD DATA DEFINITION NAME 0010 16 Character 8 DOSOP CMS OPERATION 0018 24 Bitstring 1 DOSTAPID (0) TAPE IDENTIFICATION 0018 24 Character 8 DOSDSNAM DATASET NAME 0020 32 Character 8 DOSDSTYP DATASET TYPE 0028 40 Character 2 DOSDSMD DATASET MODE 002A 42 Signed 2 * RESERVED 002C 44 Signed 4 DOSBUFF A(INPUT/OUTPUT BUFFER) 0030 48 Signed 4 DOSBYTE SIZE OF BUFFER (DATA COUNT) 0034 52 Character 1 DOSFORM FILE FORMAT: FIXED/VARIABLE 0035 53 Bitstring 1 DOSEPL EXTENDED PLIST 0036 54 Signed 2 * RESERVED 0038 56 Signed 4 DOSREAD N'BYTES ACTUALLY READ 003C 60 Signed 4 DOSITEM ITEM (RECORD) NUMBER 0040 64 Signed 4 DOSCOUT RECORDS PER CMS PHYSICAL BLOCK 0044 68 Bitstring 1 DOSDEV DEVICE TYPE CODE .... .... DOSDUM 0 DUMMY DEVICE ...1 .1.. DOSDSK 20 DISK 0045 69 Bitstring 1 DOSTAPMD RESERVED - This field is no longer used and considered undefined 0046 70 Signed 2 DOSBLKSZ BLOCK SIZE 0048 72 Dbl-Word 8 DOSWORK WORK AREA 0050 80 Signed 2 DOSYSXXX (0) LOGICAL UNIT FOR CMS/DOS 0050 80 Bitstring 1 DOSSYS SYS/PROG UNIT: X'00' =SYS, X'01'=PROG 0051 81 Bitstring 1 DOSXXX NUMBER FROM 000-255 ASSOC WITH UNIT 0052 82 Bitstring 1 DOSEXT NUMBER DOS EXTENTS LEFT TO PROCESS 0053 83 Bitstring 1 DOSEXTCT CURRENT DOS EXTENT 0054 84 Signed 4 DOSOSFST POINTER TO OS FST 0058 88 Signed 4 DOSOSDSN POINTER TO OS DSNAME BLOCK 005C 92 Signed 4 DOSVOLTB A(VOLUME ID TABLE)-VSAM MULTIVOL DATASET 0060 96 Signed 4 DOSEXTTB A(EXTENT TABLE) FOR VSAM DATASPACE 0064 100 Signed 2 DOSSENSE I/O SENSE DATA 0066 102 Bitstring 1 DOSVOLNO NO. VOLUMES (ENTRIES IN DOSVOLTB) 0067 103 Bitstring 1 DOSEXTNO NO. EXTENTS (ENTRIES IN DOSEXTTB) 0068 104 Signed 4 DOSBUFSP SIZE OF VSAM I/O BUFFER(S) 006C 108 Character 8 DOSUCNAM VSAM USER CATALOG DDNAME 0074 116 Signed 4 DOSSAVE (6) TEMP SAVE FOR RE-ENTRANT CODE 008C 140 Bitstring 1 DOSEXTCX - CURRENT EXTENT (USED BY DMSXCP) 008D 141 Character 1 DOSTYPE - DATASET TYPE (SAM=S, VSAM=A) 0090 144 Signed 4 DOSDTF POINTER TO DTF 0094 148 Signed 4 DOSF1AD POINTER TO F1 LABEL 00000098 DOSCCHHR * DOS CCHHR 0098 152 Character 2 DOSCC DOS CC - CYLINDER 009A 154 Character 2 DOSHH DOS HH - TRACK 009C 156 Character 1 DOSR DOS R - RECORD 009D 157 Bitstring 1 DOSINIT2 - DOSCB flag byte 2 1... .... DOSOSASN X'80' OS DLBL Issued and ASSGN done. .1.. .... DOSOSCLR X'40' OS DLBL CLEAR and unASSGN needed. 009E 158 Signed 2 * - RESERVED FOR FUTURE USE 00A0 160 Dbl-Word 8 DOSEND (0) END ADDRESS OF THIS BLOCK 00000014 DOSENSIZ (*-DOSSECT)/8 SIZE OF BLOCK IN DBLWORDS
DOSSECT Storage Layout
*** DOSSECT - DOS Simulation Control Block
*
* +---------------------------+---------------------------+
* 0 | DOSNEXT | DOSCBID |
* +---------------------------+---------------------------+
* 8 | DOSDD |
* +-------------------------------------------------------+
* 10 | DOSOP |
* +-------------------------------------------------------+
* 18 | DOSDSNAM |
* +-------------------------------------------------------+
* 20 | DOSDSTYP |
* +-------------+-------------+---------------------------+
* 28 | DOSDSMD |/////////////| DOSBUFF |
* +-------------+-------------+------+------+-------------+
* 30 | DOSBYTE |:FORM |DOSEPL|/////////////|
* +---------------------------+------+------+-------------+
* 38 | DOSREAD | DOSITEM |
* +---------------------------+------+------+-------------+
* 40 | DOSCOUT |DOSDEV|:TAPMD| DOSBLKSZ |
* +---------------------------+------+------+-------------+
* 48 | DOSWORK |
* +------+------+------+------+---------------------------+
* 50 |DOSSYS|DOSXXX|DOSEXT|:EXTCT| DOSOSFST |
* +------+------+------+------+---------------------------+
* 58 | DOSOSDSN | DOSVOLTB |
* +---------------------------+-------------+------+------+
* 60 | DOSEXTTB | DOSSENSE |:VOLNO|:EXTNO|
* +---------------------------+-------------+------+------+
* 68 | DOSBUFSP | DOSUCNAM- |
* +---------------------------+---------------------------+
* 70 | -(06C) | |
* +---------------------------+ |
* 78 | |
* = DOSSAVE =
* | +------+------+-------------+
* 88 | |:EXTCX|:TYPE |/////////////|
* +---------------------------+------+------+-------------+
* 90 | DOSDTF | DOSF1AD |
* +-------------+-------------+------+------+-------------+
* 98 | DOSCC | DOSHH |DOSR |:INIT2|/////////////|
* +-------------+-------------+------+------+-------------+
*
*** DOSSECT - DOS Simulation Control Block
DOSSECT Cross Reference
Symbol Dspl Value -------------- ---- ----- DOSBLKSZ 0046 DOSBUFF 002C DOSBUFSP 0068 DOSBYTE 0030 DOSCBID 0004 DOSCC 0098 DOSCCHHR 0094 00000098 DOSCMS 0000 10 DOSCOUT 0040 DOSDD 0008 DOSDDCAT 0000 08 DOSDEV 0044 DOSDOS 0000 20 DOSDSK 0044 14 DOSDSMD 0028 DOSDSNAM 0018 DOSDSTYP 0020 DOSDTF 0090 DOSDUM 0044 00 DOSEND 00A0 DOSENSIZ 00A0 00000014 DOSEPL 0035 DOSEXT 0052 DOSEXTCT 0053 DOSEXTCX 008C DOSEXTNO 0067 DOSEXTTB 0060 DOSFORM 0034 DOSF1AD 0094 DOSHH 009A DOSINIT 0000 DOSINIT2 009D DOSITEM 003C DOSJCAT 0000 02 DOSNEXT 0000 DOSOP 0010 DOSOS 0000 40 DOSOSASN 009D 80 DOSOSCLR 009D 40 DOSOSDSN 0058 DOSOSFST 0054 DOSPERM 0000 04 DOSR 009C DOSREAD 0038 DOSSAVE 0074 DOSSENSE 0064 DOSSYS 0050 DOSTAPID 0018 DOSTAPMD 0045 DOSTYPE 008D DOSUCAT 0000 01 DOSUCNAM 006C DOSVOLNO 0066 DOSVOLTB 005C DOSWORK 0048 DOSXXX 0051 DOSYSXXX 0050
Last updated on 1 May 2002 at 14:16:33 EDT.
Copyright IBM Corporation, 1990, 2002