An exit point is provided for installation‑specific processing. This exit is called for both an initialization function, where options involving pathname translation and user path processing can be selected, and a pathname translation function, where final modification to the pathname can be made before validation is performed.
The exit must be reentrant and capable of running AMODE(31) and RMODE(ANY). The exit name is SAFHFUSR and must be linked together with load module SAFHFSEC. A sample SMPE usermod to perform this is in CAIJCL member UD00001.
Upon entry to the exit, register R1 points to a list of addresses. The end of the list is indicated by the high order bit in the last full word.
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