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Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
DOSSECT
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 00000000 DOSDUM 0 DUMMY DEVICE 00000014 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|/////////////| * +-------------+-------------+------+------+-------------+ * A0 | | * = DOSEND = * | | * +-------------------------------------------------------+ * *** DOSSECT - DOS Simulation Control Block
DOSSECT Cross Reference
(contains links to field and bit definitions)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 00000014
DOSDSMD 0028
DOSDSNAM 0018
DOSDSTYP 0020
DOSDTF 0090
DOSDUM 0044 00000000
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 12 Aug 1999 at 11:19:45 EDT.
Copyright IBM Corporation, 1990, 1999