Programming considerations

Be sure your exit routines be in common storage. Do not linkedit this exit with HASPFSSM.
The $SAVE and $RETURN services are available in the FSS environment.
The service routines provided in the HASPFSSM module may be used within your exit routine. The cell pool services, $GETBLK and $RETBLK can be used to acquire save areas and other predefined storage cells dynamically. You are responsible for returning all storage cells explicitly acquired.
Locating JCT Control Block Extensions
You can locate extensions to the job control table ($JCT) control block from this exit using the $JCTXGET macro. For example, you can use these extensions to store job-related information. For more information, see z/OS JES2 Macros.