Technical Information › User I/O Appendage Analysis

User I/O Appendage Analysis

Optionally, a data center can obtain control during I/O operations by writing an I/O appendage routine. An appendage can examine the status of I/O operations by examining status information at the hardware level. The appendage can receive control during various I/O operations, such as I/O start, program interruption, end of extent, channel end, or abnormal end. Because appendages get control before, after, or during I/O operations, the appendages can alter data.

CA Auditor searches SYS1.SVCLIB, the LPA libraries, and the linklist to find user I/O appendages. The User I/O Appendage Analysis option shows the number of user appendages on your system and whether programs that use these user appendages must be APF-authorized.

To review the status of a user appendage

1. From the Primary Menu, select option 3.

   The z/OS Technical Information screen is displayed.

2. Select option 2.

   The User I/O Appendage Analysis screen is displayed.

3. From this screen you can:
   • Enter D next to one of the appendages to update the review status and description of an I/O appendage
   • Enter B to browse an appendage
   • Enter F to freeze an appendage