Filter
Top Products
Contents
Notices ...........................xvii
Programming interface information .................xviii
Trademarks..........................xix
Preface ...........................xxi
What this book is about .....................xxi
Who this book is for.......................xxi
What you need to know to understand this book ............xxi
How to use this book ......................xxi
Notes on terminology ......................xxi
Syntax notation and conventions used in this book ...........xxii
Bibliography .........................xxiii
CICS Transaction Server for OS/390 ................xxiii
CICS books for CICS Transaction Server for OS/390 .........xxiii
CICSPlex SM books for CICS Transaction Server for OS/390 ......xxiv
Other CICS books ......................xxiv
Books from related libraries ....................xxiv
ACF/TCAM books ......................xxiv
MVS books .........................xxv
VTAM books ........................xxv
Other related books......................xxv
Determining if a publication is current ................xxvi
Summary of changes......................xxvii
Changes for this edition .....................xxvii
Changes for CICS Transaction Server for OS/390 Release 2 .......xxvii
Changes for CICS Transaction Server for OS/390 Release 1 .......xxviii
Part 1. Customizing with user exit programs ................. 1
Chapter 1. Global user exit programs ............... 3
Overview — what is a global user exit? ............... 3
Global user exit programs .................... 4
Register conventions ..................... 4
31-bit addressing implications .................. 5
Using CICS services ..................... 5
Using EDF with global user exits ................. 6
The global work area ..................... 6
Making trace entries ..................... 7
Parameters passed to the global user exit program .......... 7
Returning values to CICS ...................10
Restrictions on the use of fields as programming interfaces .......11
Exit programs and the CICS storage protection facility .........11
Errors in user exit programs...................12
Defining, enabling, and disabling an exit program ...........13
Invoking more than one exit program at a single exit .........13
Invoking a single exit program at more than one exit .........14
Sample global user exit programs ................14
List of global user exit points ...................19
Activity keypoint program exit XAKUSER ...............25
Exit XAKUSER .......................25
Basic Mapping Support exits XBMIN and XBMOUT ...........27
© Copyright IBM Corp. 1977, 1999 iii