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Programming Interface Information:
This page documents intended Programming
Interfaces that allow the customer to write programs to obtain the services of VM/ESA. |
IHADECB
Cross Reference (Contains links to field and bit definitions)
IHADECB Prolog
NAME : CMSCB DESCRIPTION: DATA EVENT CONTROL BLOCKS FOR BSAM, BISAM, BDAM, QTAM, BTAM. DSECT : IHADECB FUNCTION : IHADECB is the simulated data event control block used for CMS processing of OS macros and OS access methods. The IOBECBPT field in FCBSECT points to IHADECB.
IHADECB Control Block Content
IHADECB DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure IHADECB DATA EVENT CONTROL BLOCKS FOR 0000 0 Signed 4 DECSDECB - EVENT CONTROL BLOCK 0004 4 Signed 2 DECTYPE - TYPE OF I/O REQUEST 1... .... DECBRD X'80' - READ SF ..1. .... DECBWR X'20' - WRITE SF 0006 6 Signed 2 DECLNGTH - LENGTH OF KEY & DATA 0008 8 Address 4 DECDCBAD - V(DATA CONTROL BLOCK) 000C 12 Address 4 DECAREA - V(KEY & DATA, BUFFER) 0010 16 Address 4 DECIOBPT - V(IOB) BDAM EXTENSION 0014 20 Address 4 DECKYADR - V(KEY) 0018 24 Address 4 DECRECPT - V(BLOCK REFERENCE FIELD) SOME FREQUENTLY USED EQUATES 00000020 DDNAM FCBDSTYP - FILETYPE = DATA SET NAME ...1 .... BLK X'10' - RECFM=BLOCKED RECORDS ..1. .... BS X'20' - MACRF=BSAM ..1. .... DA X'20' - DSORG=DIRECT ACCESS 1... .... FXD X'80' - RECFM=FIXED LENGTH RECORDS 1... .... IS X'80' - DSORG=INDEXED SEQUENTIAL .... 1... LOC X'08' - MACRF=LOCATE MODE ...1 .... MOV X'10' - MACRF=MOVE MODE .1.. .... PS X'40' - DSORG=PHYSICAL SEQUENTIAL .... ..11 POU X'03' - DSORG=PARTITIONED UNMOVEABLE .... ..1. PO X'02' - DSORG=PARTIONED ORGANIZATION 1... .... PREVIOUS X'80' - OFLGS=PREVIOUS I/O OPERATION .1.. .... QS X'40' - MACRF=QSAM 11.. .... UND X'C0' - RECFM=UNDEFIN FORMAT RECORDS .1.. .... VAR X'40' - RECFM=VARIABLE LENGTH RECORDS ..1. .... ANSID X'20' - RECFM=VARIABLE LENGTH RECS (ANSI) .... 1... SPANNED X'08' - RECFM=SPANNED
IHADECB Storage Layout
*** IHADECB - DATA EVENT CONTROL BLOCKS FOR * * +---------------------------+-------------+-------------+ * 0 | DECSDECB | DECTYPE | DECLNGTH | * +---------------------------+-------------+-------------+ * 8 | DECDCBAD | DECAREA | * +---------------------------+---------------------------+ * 10 | DECIOBPT | DECKYADR | * +---------------------------+---------------------------+ * 18 | DECRECPT | 1C * +---------------------------+ * *** IHADECB - DATA EVENT CONTROL BLOCKS FOR
IHADECB Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----ANSID 0018 20
BLK 0018 10
BS 0018 20
DA 0018 20
DDNAM 0018 00000020
DECAREA 000C
DECBRD 0004 80
DECBWR 0004 20
DECDCBAD 0008
DECIOBPT 0010
DECKYADR 0014
DECLNGTH 0006
DECRECPT 0018
DECSDECB 0000
DECTYPE 0004
FXD 0018 80
IS 0018 80
LOC 0018 08
MOV 0018 10
PO 0018 02
POU 0018 03
PREVIOUS 0018 80
PS 0018 40
QS 0018 40
SPANNED 0018 08
UND 0018 C0
VAR 0018 40
Last updated on 12 Aug 1999 at 11:20:54 EDT.
Copyright IBM Corporation, 1990, 1999