Protecting a Process from Abnormal Terminations

Preventing All Abnormal Terminations
Protection against Most Conditions
Protection against All Conditions
Including Multiple Statements
Determining the Cause of the Error
Using TRY as an Expression
Providing Alternate Sets of Error Handling Code
Optimizing Performance
Triggering Program Dumps
Protecting a Process from Faults
Retrying a Failed Task
Protecting a Process from Operator DS (Discontinue) Commands
Protecting Procedures from DS and ST Commands
Performing Cleanup during an Abnormal Termination
Interactions between Error Recovery Statements
Multiple TRY Statements
TRY Statements and Library Delinkage
TRY Statements and ON Statements
TRY Statements, EPILOG Procedures, and EXCEPTION Procedures

You can use a variety of different methods to prevent a process from being terminated abnormally. Depending on the method you choose, you can

  • Trap faults and recover from them.

  • Protect a process from operator-entered DS (Discontinue) system commands.

  • Retry a process that was terminated by a fault.

  • Protect a process from all possible faults, errors, and termination conditions.

You can also specify code to perform cleanup functions when a process is forced to terminate abnormally.

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