gtpp1m14 | Program Development Support Reference |
The program event recording (PER) facility assists in problem determination for programs running in a native TPF environment. You can trace the following events:
Enter the ZSPER command to display PER status, and activate and deactivate PER on IBM ESA/390 processors. The ZSPER command allows you to provide a data parameter to be compared to a particular event you are monitoring in the range you specified. If a match is detected, the PER interrupt is processed. Use the printer option on the ZSPER command to designate an output device that is meaningful to your installation. The value that you specify for this parameter is passed, together with the PER interrupt data, to the UPER user exit. The default output device is the read-only (RO) computer room agent set (CRAS) console.
At interrupt time, the PER facility provides the following set of common data:
Access to these data items is provided to the UCCPER PER control program (CP) user exit in the CCUEXT CSECT.
User exits provide a means for users of the TPF system to add user-unique processing at various points in the TPF programs, without having to modify the released programs.