User Exits › Test Compression Facility User Exit › PREEXIT Pre-Processing Exit

PREEXIT Pre-Processing Exit

The PREEXIT gets control after TCF obtains the next sequential data set name from catalog management, but before it obtains the detailed catalog information and format 1 DSCB. Its function is to decide whether or not to allow TCF to compress the data set. PREEXIT gets control before any selection/exclusion testing, which would be performed based on SELECT or EXCLUDE statements in the job stream, so SELECT and EXCLUDE statements can override the PREEXIT's decision to process the data set. The parameter list that is passed to the exit is shown in the following table.