IBM SC33-1683-02 - Manual (Page 507)

DFHNEPC DSECT
DS F Load instruction
DS F Branch instruction
CSVTNEP DS A Node error program base address
CSVTESBL DS A NEPESBL - ESB locate routine
CSVTNEBD DS A NEPNEBD - NEB delete routine
CSVTECUP DS A NEPECUP - error count update
routine
User-written node error programs
You can write your own NEP in any of the CICS-supported languages. However,
CICS-supplied NEP code is provided in assembler language only. The
communication area parameter list is supplied in assembler-language and C
versions. The names of the supplied source files, copy books, and macros, and the
libraries in which they can be found, are listed in Table 23.
Table 23. Supplied source files, copy books, and macros
Name Type Description Library
DFHZNEP0 Program Default node error
program (assembler
language) CICSTS13.CICS.SDFHSAMP
DFHZNEPX Source Default NEP (embedded
by DFHZNEP0 via COPY
statement) CICSTS13.CICS.SDFHSAMP
DFHSNEP Macro Sample NEP program
generator (assembler
language) CICSTS13.CICS.SDFHMAC
DFHZNEPI Macro NEP interface generator
(for multiple NEPs) CICSTS13.CICS.SDFHMAC
DFHNEPCA Macro Assembler-language
communication area CICSTS13.CICS.SDFHMAC
DFHNEPCA Copy
book C-language
communication area CICSTS13.CICS.SDFHC370
If you code in assembler language, you can use the sample NEP as a framework
on which to construct your own node error program.
Restrictions on the use of EXEC CICS commands
There are certain restrictions on the commands that a NEP can issue. The use of
any commands which require a principal facility causes unpredictable results,
and should be avoided. In particular, you should not use commands which invoke
the following functions:
v Terminal control (“CEMT-type” commands, such as EXEC CICS INQUIRE
TERMINAL,
are permissible)
v BMS (except routing)
v ISC communication (including function shipping). This includes START requests
for remote transactions. Such requests are not recommended because CSNE
(Node Abnormal Condition task) might become suspended while doing an
ALLOCATE to the remote system.
If you need to start a remote transaction, start a local transaction which starts a
remote one in turn.
the sample node error program
Chapter 9. Writing a node error program 475