If there's no way to get what you need without using the functions that IBM requires be authorized, here's another possibility. We had a sysprog years ago who coded a user SVC that could be called to flip the JSCBAUTH bit on or off, with a very short list of program names in an internal table that are allowed to call the user SVC. It was needed for a dynamic allocation common module (SVC99) because IBM required that the caller be authorized in order to code the WAIT FOR UNITS parameter. We were having a lot of contention with tape drives at the time (pre virtual tape days). The dynalloc module called the user SVC to get itself authorized if wait for units was requested, it issued the SVC99, then called the user SVC again to de-authorize.
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