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Re:question about numbered user exits

  • 1.  Re:question about numbered user exits

    Posted 10-18-2010 11:36 AM
    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