IBM SC33-1683-02 - Manual (Page 131)

UEFDSACC
One byte indicating the access method of the file. The
possible values are:
UEFVSAM
VSAM file
UEFBDAM
BDAM file.
UEFBCRV
Set to nulls for this exit.
UEFFRLOG
Set to nulls for this exit.
UEFFRCLG
Set to blanks for this exit.
UEFCDATE
Set to nulls for this exit.
UEFCTIME
Set to nulls for this exit.
UEFBCAS
Set to nulls for this exit.
UEFACBCP
This field is set to nulls in this exit.
Note: Only the first seven fields of UEPFINFO are set for this exit.
Of the remaining fields, URFFRCLG is set to blanks, and the
others are set to nulls.
UEPRECUR
Address of a halfword recursion counter. The counter is set to 0
when the exit is first invoked, and is incremented for each recursive
call.
Return codes
UERCNORM
Continue processing.
UERCBYP
Suppress the file request. You cannot use UERCBYP:
v To suppress a CLOSE request if the second byte of UEPFSREQ
indicates it is one of the following types of close:
End of load-mode close (UEPFSELM)
Immediate close (UEPFSIMM)
Immediate close pending (UEPFSICP)
v To suppress an OPEN request if a file is being opened to carry
out backout processing, because this would cause a backout
failure. The second byte of UEPFSREQ is set to UEPFSOFB if
the file is being opened for backout.
In the case of a valid suppression, CICS issues message
DFHFC0996:
Open/Close/Enable/Disable/Cancel of close of file
filename suppressed due to intervention of user exit
file control file state program exits
Chapter 1. Global user exit programs 99