z/OS DFSORT Application Programming Guide
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Processing user-defined data types with EFS program user exit routines

z/OS DFSORT Application Programming Guide
SC23-6878-00

You can write your EFS program to provide two user exit routines to perform various tasks during run-time.

Your EFS program user exit routines can:
  • Process user-defined data types. Your EFS program can provide an EFS01 routine to alter any control field of an input record.
  • Include or omit records based on user-defined data types. Your EFS program can provide an exit routine to examine any input field of an input record to determine whether or not to include that record for processing.
Parent topic: What you can do with EFS

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