User Exit Reference › USREXIT3 User Exit

USREXIT3 User Exit

Use the USREXIT3 user exit to customize CA VM:Tape label processing. This exit, if you choose to use it, is called for all mounts. It may request that CA VM:Tape perform standard label processing, bypass label processing, unload the tape and reissue the mount message, or cancel the mount request. Use this exit:

• If your site’s tapes have a label format different from ANSI standard label format
• To perform security checks for standard label or non-labeled tapes
• To perform data set name verification by comparing the HDR1 record from the tape against the data set name in the TMC

The exit must be written in assembler and should be reusable each time it is called. Do not modify the fields passed to the exit.