UUMAX2 is a user-written routine called by the UMAP utility program before servicing a UMAP option. This module allows the user to modify global defaults to UMAP and restrict UMAP execution by user ID.

This document covers the following topics:

• How to Use UUMAX2

• UUMAX2 Conventions

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How to Use UUMAX2

Upon entry to UUMAX2, a set of parameters is received in the form of fullword addresses in register 1.

UUMAX2 Conventions

The following table summarizes the linkage conventions of UUMAX2.

Feature	Convention
Attributes	Reentrant if in a resident area
Type	Thread
Size	Restricted to the UMAP thread region
Registers at Entry	Register 1 Address of the parameter list Register 13 Address of an 18-fullword save area Register 14 Return address in the calling module Register 15 Entry address of UUMAX2
Registers at Return	Registers 2 through 13 remain unchanged. Register 15 contains the return code.
Parameters	Word 1 Address of the eight-byte user ID. Word 2 Address of the two-byte TID. Word 3 Address of a one-byte UMAP option code:
Return Codes	0 Allow the request. 4 Disallow the request.
Considerations	Will be loaded dynamically.