z/OS MVS Using the Subsystem Interface
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Disabling Previously Supported Functions

z/OS MVS Using the Subsystem Interface
SA38-0679-00

You can use the disable function of the IEFJSVEC service to dynamically disable a function code so that your subsystem no longer gets control for that function. Disabling a function is in effect a "logical delete."

Attention: Because there is no serialization on updating the table in the SSVT, other requests for the supported functions might be coming in asynchronously. Therefore, it is important to not remove the function routines from storage.
When preparing to disable one or more function codes, consider:
  • When you will be invoking IEFJSVEC

    If you are invoking IEFJSVEC while running under a command processor, for example, from a subsystem routine invoked during START command processing, then a console ID and CART should be provided, as described in Input Parameters.

  • Which of the existing function codes are no longer supported.

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