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The user exit points in DFHCSDUP
There are five user exit points in DFHCSDUP. By specifying the appropriate entry
parameters, you can cause DFHCSDUP to pass control to an exit routine at any of
these points.
None of the user exits supports XPI calls.
Parameters passed to the user exit routines
The address of a parameter list is passed to the user exit routine in register 1. The
list contains some standard parameters that are passed to all of the exit routines,
and may also contain some exit-specific parameters that are unique to the exit point
from which the exit routine is being invoked.
The format of the parameter list is identical to that used by CICS global user exits.
For a description of the standard parameters, see “DFHUEPAR standard
parameters” on page 8. Explanations of the exit-specific parameters are included in
the descriptions of the individual exits, which follow.
The initialization exit
The initialization exit is invoked once during DFHCSDUP initialization. Its purpose is
to allow a routine to perform exit-related initialization. For example, the routine may
obtain its own global work area and save its address in UEPGAA and its length in
the halfword pointed to by UEPGAL. These values are retained by DFHCSDUP and
become available at the other exit points.
When invoked
Invoked once, on entry to DFHCSDUP.
Exit-specific parameters
None.
Return codes
UERCNORM (X'00')
Continue processing.
UERCERR
Irrecoverable error. This causes DFHCSDUP to terminate with a
return code of ‘8’.
XPI calls
Must not be used.
invoking DFHCSDUP from a user program
Chapter 30. User programs for the system definition utility program (DFHCSDUP) 755