Returning control to the application program

If you specify RTNABND=YES in the DFHRMCAL macro, control returns to the application program when the task-related user exit is unavailable, for example, because it is not enabled or started.

Note that for assembler language application programs, a negative value in register 15 signals to the application program that control has returned because the exit is unavailable. The task-related user exit program can use positive values (including zero) in register 15 to pass resource manager response codes to the application program.

If you do not specify RTNABND=YES and the task-related user exit is unavailable, the application program terminates abnormally with the abend code ‘AEY9'.