IBM SC33-1683-02 - Manual (Page 129)

Exit XFCSREQ
When invoked
Before a file ENABLE, DISABLE, OPEN, CLOSE, or CANCEL CLOSE is
attempted.
Exit-specific parameters
UEPFSREQ
Address of a 2-byte field that indicates the type of file request. The
first byte contains one of the following values:
UEPFSOPN
Open request
UEPFSCLS
Close request
UEPFSENB
Enable request
UEPFSDIS
Disable request
UEPFSCAN
Cancel close file request.
If the first byte indicates an open request (UEPFSOPN), the second
byte shows the type of open:
UEPFSNOP
Normal open
UEPFSOFB
Open for backout.
If the first byte indicates a close request (UEPFSCLS), the second
byte shows the type of close:
UEPFSNC
Normal close
UEPFSCP
Close pending
UEPFSELM
End of load mode close
UEPFSIMM
Immediate close
UEPFSICP
Immediate close pending
UEPFSQU
RLS quiesce close.
UEPFILE
Address of the 8-byte file name.
UEPFINFO
Address of a storage area containing information about the file. The
area can be mapped using the DSECT DFHUEFDS, which contains
the following fields:
file control file state program exits
Chapter 1. Global user exit programs 97