IBM SC33-1683-02 - Manual (Page 61)

UERCPURG
Task purged during XPI call.
XPI calls
All can be used.
The field element table structure
The field element table contains one or more elements which provide information
about each “field of interest” passed to the exit. A “field of interest” is a field which
has been defined as VALIDN=USEREXIT in the map source file used to create the
mapset referenced in the mapping operation.
Each field element has the following structure:
BMXMAPST
is an 8-byte area which contains the name of the mapset associated with this
field. If terminal or alternate suffixes are used with mapset names in your CICS
installation, the mapset name may have a suffix appended to the name
specified in the mapping request.
BMXMAP
is a 7-byte area which contains the name of the map associated with this field.
BMXFDFB
is a one-byte field copied from the field specification in the map load module. It
contains indicators as follows:
X'80' CASE=MIXED
X'40' Group field entry
X'20' Group field descriptor
X'10' ATTRB=DET
X'08' JUSTIFY=ZERO
X'04' JUSTIFY=RIGHT
X'02' INITIAL,XINIT, or GINIT specified
X'01' Named field (DSECT entry exists)
BMXMAPLN
is a halfword binary value which contains the field length defined in the
LENGTH option of the DFHMDF macro.
BMXACTLN
is a halfword binary value which contains the actual length of the data received
or transmitted in this field.
BMXDATA
is the address of the field data.
In the XBMIN exit, BMXDATA points into a work area which BMS has obtained
for input mapping purposes. When the exit returns control, this work area is
copied to the application data structure associated with this map.
In the XBMOUT exit, BMXDATA points into a terminal input/output area (TIOA)
in which BMS has generated an output datastream. When the exit returns
Basic Mapping Support exits
Chapter 1. Global user exit programs 29
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