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Rewriting user-replaceable programs ................401
Assembling and link-editing user-replaceable programs..........402
User-replaceable programs and the storage protection facility .......405
Execution key for user-replaceable programs ............405
Data storage key for user-replaceable programs ...........406
Chapter 6. Writing a program error program.............407
The sample programs and copy books................410
Chapter 7. Writing a transaction restart program ...........411
The DFHREST communications area ................412
The CICS-supplied transaction restart program.............414
Chapter 8. Writing a terminal error program .............415
Background to error handling for TCAM and sequential devices ......415
When an abnormal condition occurs................416
Terminal control program ....................416
Terminal abnormal condition program ...............416
Terminal error program ....................416
The communication area ....................417
Terminal abnormal condition line entry (TACLE) ...........417
The sample terminal error program .................417
Components of the sample terminal error program ..........418
Structure of the sample terminal error program............419
Sample terminal error program messages .............423
Generating the sample terminal error program ............425
User-written terminal error programs ................437
Why write your own terminal error program? ............438
Restrictions on the use of EXEC CICS commands ..........438
Addressing the contents of the communication area ..........438
Addressing the contents of the TACLE ...............441
Example of a user-written terminal error program ...........445
Chapter 9. Writing a node error program ..............449
Background to CICS-VTAM error handling ..............450
Why use a NEP to supplement CICS default actions? .........450
An overview of writing a NEP ..................451
The default NEP .......................452
The sample NEP.......................452
Multiple NEPs ........................455
When an abnormal condition occurs.................457
The communication area ....................458
The sample node error program ..................465
Compatibility with the sample terminal error program .........466
Components of the sample node error program ...........466
Generating the sample node error program .............469
User-written node error programs..................475
Restrictions on the use of EXEC CICS commands ..........475
Entry and addressability ....................476
Coding for the 3270 ‘unavailable printer’ condition ..........476
Coding for session failures ...................477
Coding for specific VTAM sense codes...............478
Writing multiple NEPs .....................478
DFHZNEPI macros ......................478
Handling shutdown hung terminals in the node error program ......480
Using the node error program with XRF or persistent sessions .......480
Contents ix