Technical Information › Exits › Dynamic Exits Display

Dynamic Exits Display

Certain exits can be specified in the logical parmlib members EXITxx, SMFPRMxx, and other places. In addition, z/OS provide a dynamic exit facility that allows exits to be specified in the logical parmlib member PROGxx. Exits specified here have additional characteristics not seen before:

• An exit point has a name of up to 16 characters.
• Multiple exit programs can be invoked at a single point.
• Exit programs can reside in the link pack area, linklist, or in any cataloged authorized library.
• Exits can be associated with a job name or prefix. This lets the exit be tailored specifically for production jobs, CICS, or for one specific job name.
• After a specified number of abends in the exit program, it is rendered inactive. This abend count is specified by the site, is specific to the exit program, and can be total or consecutive abends.
• Exits can be added, modified, or removed through Parmlib, console commands, or a programming interface.
• Program products such as CA ACF2 can specify their own exits dynamically.

The list of exits this applies to are limited. It includes allocation exits that were previously specified in EXITxx and SMF exits that were previously specified in SMFPRMxx. It also includes any exits that are dynamically defined by any products. The allocation exits are:

• Allocated/Offline Device Installation Exit
• Specific Waits Installation Exit
• Volume ENQ Installation Exit
• Volume Mount Installation Exit
• IEFDB401-Allocation Input Validation Routine

System exits can be specified in Parmlib member PROGxx and, or instead of, in member EXITxx. Multiple exits can be specified for a single exit point.

Exits can display at the console using the DISPLAY PROG,EXIT command. Exits can be dynamically added, deleted, or have their status changed using the SETPROG EXIT command.

The z/OS Dynamic Exits function locates and analyzes exits specified in Parmlib members EXITxx, SMFPRMxx, and PROGxx.

To display dynamic exit information

1. From the z/OS Technical Information screen, select option 3 (3.3).

   The z/OS Exits menu is displayed

2. Select option 2.

   The z/OS Dynamic Exits screen is displayed.

3. Enter S (Search) next to the entry you want information about.

   The Dynamic Exit Library Search display is displayed.