IBADECE
IHADECB, which is invoked via theCMSCB macro, is the simulated data event control blcck
used forCMS processing of OS macros and OS access methods. The ICEECBPT field in
FCBSECT points to IBADECB.
Hexadecimal
o
810 18
Displacement
------------0 4
6
8
C10 14
18
DECSDECB
DECDCBAD
DECIOBPT
DECRECPT
FieldName DECSDECB DS F DECTYPE DS H in DECTYPE DECBRD BQU --X'80'--- DECBWR EQU X'20' DECLNGTB DS B
DECDCBADDS A
DECAREADS A
DECIOBPTDS A DECKYADR DS A
DECRECPTDS A DDNAM EQU FCBDSTYP BLK EQU X'10' BS EQU X'20' DA EQU X'20' FXD EQU X'80' IS EQU X'80' LOC EQU X'08' MOV EQU X'10' PS EQU X'40' PO EQU X'02' PREVIOUS EQU X'80' QS EQU X'40' UND EQU X'CO' VAR EQU X'40' DEC'IYPE DECLNGTB
DECAREADECKYADR Field Description, Contents, Meaning Event control block
Type of I/O request
ReadSF Write SF Length of key and data V(data control tlock) V(key and data, buffer) V (IOE) V (key) V(block reference fieldj
Filetype = data set name
RECFM=blocked records!UCRF=BSAM DSORG=direct access
RECFM=fixed-length records
DSORG=indexed sequential
MACRF=locate mode!UCRF=move mode
DSORG=physical sequential
DSORG=partitioned organizationOFLGS=previous I/O operaticn MACRF=QSAM RECFM=undefined format records
RECFM=variatle-length records
Section 2.CMS rata Areas and Control Blocks 195
IHADECB, which is invoked via the
used for
FCBSECT points to IBADECB.
Hexadecimal
o
8
Displacement
------------
6
8
C
18
DECSDECB
DECDCBAD
DECIOBPT
DECRECPT
Field
DECDCBAD
DECAREA
DECIOBPT
DECRECPT
DECAREA
Type of I/O request
Read
Filetype = data set name
RECFM=blocked records
RECFM=fixed-length records
DSORG=indexed sequential
MACRF=locate mode
DSORG=physical sequential
DSORG=partitioned organization
RECFM=variatle-length records
Section 2.