Slide 6

To allow startup of a program without modifications, TDF provides the TDFHOOK program. Simply, copy and modify the startup job, replacing the EXEC=userpgm with EXEC=TDFHOOK,PARM=userpgm.

For programs that also have startup parameters specified on the PARM=, the TDF documentation describes how to append the debugged program startup parameters within parenthesis. TDFHOOK will parse out the application parameters and send them in the same format as sent by z/OS. After establishing the trap environment, TDFHOOK will generate a system, TDF401I breakpoint. All system generated breakpoints from dynamic program intercepts, start with TDF400-TDF499. As a result, TDF4 are reserved characters, as the first four characters, in a breakpoint description.

Watch a 3 minute video