Your EFS program can alter the control statement or PARM option string and replace it in the original contiguous storage area. If the area is too small, your program must allocate a new contiguous area. If the string is returned in a new storage area, your EFS program will be responsible for freeing the acquired storage.

Your EFS program must set an Informational flag to indicate whether the control statement or PARM option in the string should be parsed or ignored by DFSORT (see Information flags for further details).

OUTFIL statements cannot be returned from an EFS program to be parsed.