Cartridge entry installation exit (CBRUXENT) usage requirements

The cartridge entry installation exit must reside in load module CBRUXENT. It is invoked by OAM by way of the MVS LINK macro and must reside in a library in the LNKLST concatenation. The installation exit can be executed above or below the 16-MB line. If multiple tape libraries are defined to the system, the installation exit must be coded and link-edited on the system as reentrant.

Note: CBRUXENT is invoked out of the master address space when it is driven as a result of the LIBRARY ENTER command (for manual cartridge entry processing).

The following characteristics describe the execution environment in which the cartridge entry installation exit is invoked:

Task mode
Unlocked
Noncross memory mode (HASN = PASN = SASN)
The addressing mode specified when the exit was linkage edited
Primary ASC mode (not AR mode)
Key 5, problem state; or a user key, supervisor state

Rule: Mapping macro CBRUXEPL must be included by the installation exit.