ca.portal.admin

Re:question about numbered user exits

Discussion created by ca.portal.admin on Oct 18, 2010
I am reading Chris Hoelscher's article on z/IIP exploitation in the
September 2010 ""IUA Connections"" with great interest as our site
experienced the problem that he describes. Chris indicates that the
numbered user exits can contribute to TCB/SRB swapping. We use exit 28
(security pre-processing) and I am wondering if this could account for
some of the high swapping rate that we saw.

Here is my question: Is there any way to determine how many times a
numbered user exit is actually being executed?

Kay Rozeboom
State of Iowa
Information Technology Enterprise
Department of Administrative Services
Telephone: 515.281.6139 Fax: 515.281.6137
Email: Kay.Rozeboom@Iowa.Gov
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Normal

Normal
Re: question about numbered user exits
"As a result of lots of interaction with John Siraco about my user exits
during my z/IIP implementation, I decide to remove my Exit 17 and Exit
18 stubs as I never use them. I seem to remember that we were not
entirely sure whether they swap or not but as I didn't neeed them...

BROWSE CAI.GJR170.PPOPTION(RHDCUXIT) - 01.12 Line 00000069
Command ===> Scrol
#DEFXIT , EXIT 13 - SHUTDOWN
#DEFXIT MODE=SYSTEM,CALL=DC,NAME=I170UX14
* EXIT 14 - BIND RUN UNIT
#DEFXIT , EXIT 15 - VIB STATISTICS
#DEFXIT , EXIT 16 - PRINT REPORT
* #DEFXIT MODE=SYSTEM,CALL=DC,EP=X17STUB
#DEFXIT , EXIT 17 - INPUT DATASTREAM
* #DEFXIT MODE=SYSTEM,CALL=DC,EP=X18STUB
#DEFXIT , EXIT 18 - OUTPUT DATASTREAM
#DEFXIT , EXIT 19 - ASYNCHRONOUS TERMINAL CONNECTION
#DEFXIT MODE=SYSTEM,CALL=DC,NAME=B$DCUX20

Chris Trayler

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