7 User Exit Functions

This chapter includes the following sections:

• Function summary

• EXIT_CALL_RESULT

• EXIT_CALL_TYPE

• EXIT_PARAMS

• EXIT_REC_BUF

• Calling environment functions

User exits extend and customize the functionality of the Extract and Replicat processing by calling COBOL, TAL or C routines from the Extract or Replicat parameter files. At different points during processing you can invoke custom COBOL, TAL or C routines to perform specialized functions.

Reference Guide for HP NonStop (Guardian) supplies:

• Function parameters for accepting and processing different events and information from Extract or Replicat.

• Calling environment functions, in TAL, C and COBOL, for retrieving context information from Extract or Replicat.

Two example user exits are supplied with the installation code: DEMOXCOB (written in COBOL) and DEMOXC (written in C). You can use these exits as a sample to help plan your own user exit routines. Two blank user exit templates are also included: USEREXC for C and USEREXT for TAL. You can use these to start coding your routines. There is no sample for TAL and no template for COBOL.