OPEN/EOV nonspecific tape volume mount (Eioption 17)

This exit point is called when a nonspecific tape is passed to DFSMSdss. The EIRECPTR points to the DCB exit parameter list. You can specify a specific volume serial with this exit by placing the volume serial in the first 6 bytes of the record pointed to by EIRECPTR. DFSMSdss passes this volume serial and return a code of 4 to OPEN/EOV informing it to use the specified volume serial. The EIRECPTR points to the parameter list described by the IECOENTE macro.

Note: DEFER must be specified in the JCL for this exit to be called.

The valid return codes are:

0: Continue normal processing
16: Record modified
20: Disconnect exit
32: End function. This return code is only valid for a full dump and a full restore operation