What you can do with EFS

You can design your EFS program to perform seven basic tasks at the initialization, input, and termination phases of DFSORT. Some of the tasks require using the EFS program-generated user exit routines EFS01 and EFS02.

Table 1. Functions of an Extended Function Support (EFS) Program
Functions of an Extended Function Support (EFS) Program EFS Program Functions	Initialization Phase	Input Phase	Termination Phase
Opening and initializing	EFS Program
Examining, altering, or ignoring DFSORT and non-DFSORT control statements prior to processing by DFSORT	EFS Program
Sorting or merging user-defined data types with user-defined collating sequences		EFS01
Providing the logic to include or omit records based on user-defined data types		EFS02
Supplying messages to DFSORT for printing to the message data set	EFS Program		EFS Program
Terminating DFSORT	EFS Program	EFS01, EFS02	EFS Program
Closing data sets and housekeeping			EFS Program