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area, with the contents of registers 14 through 12 stored in the fourth and
subsequent words. Its fifth word, representing the calling program's register
15, is cleared by CICS before the task-related user exit program is invoked,
so that it can be used to convey response codes from the resource
manager to the calling program. For this reason you cannot use register 15
to send data to the task-related user exit program. The seventh word of the
save area contains the caller's register 1. Register 1 addresses the caller's
parameter list if the exit program is being invoked by the CICS task
manager or the CICS syncpoint manager, by EDF, or at CICS termination.
When the caller is an application program, the contents of register 1 are
determined by the linkage conventions of the adapter's language interface.
UEPTAA
Address of the local work area requested in the EXEC CICS ENABLE
command. The local work area is described on page “The local work area”
on page 293. CICS initializes the work area to X'00' throughout on first
acquiring the area; that is, when the task first invokes the task-related user
exit program.
UEPTAL
Address of a halfword containing the binary length of the local work area.
UEPEIB
Address of the EXEC interface block (EIB) created by CICS for the
task-related user exit program. The EIB exists only for the duration of the
call and it allows the task-related user exit program to request CICS
services through the command-level interface. This is not the same EIB that
is available to the calling program, so you cannot access the calling
program's environment other than by UEPHMSA (see above), which
provides the address of the calling program's register save area (RSA).
UEPURID
Address of CICS unit of recovery identifier. This field contains the 8-byte
date and time value that is generated by an STCK instruction, and it
identifies the current unit of work.
UEPFLAGS
Address of the schedule flag word. This is a fullword that the task-related
user exit program uses to register its need for CICS management programs'
services. For more information, see “The schedule flag word” on page 287.
UEPRMSTK
Address of the kernel stack entry.
UEPUOWDS
Address of the APPC unit of work (UOW) identifier.
UEPSECFLG
Address of the user security flag. The user security flag is a 1-byte field that
can take the following values:
UEPNOSEC (X'80')
Security is not active for this CICS system.
UEPSEC (X'20')
Security is active for this CICS system. Only in this case is the
address of the “user security block” set.
UEPSECBLK
Address of a fullword that addresses the “user security block”—that is, the
ACEE.
Chapter 2. Task-related user exit programs 275