Using other EXLST exit routines

Although the ATTN exit routine is the chief exit routine for LU 6.2 functions, other EXLST exit routines can also be useful to the application program. The LERAD, SYNAD, and TPEND exit routines, in particular, are highly recommended for handling error situations that arise. Because VTAM® handles many errors for the application program, the scope of the LERAD and SYNAD exit routines, particularly SYNAD, is much narrower for LU 6.2 support.

EXLST is a declarative macroinstruction. The following example shows how this macroinstruction defines the exit routines to be used:

EXLST1   EXLST AM=VTAM,LOGON=LOGON1,SYNAD=SYNAD1,LERAD=LERAD1,         *
               TPEND=TPEND1,ATTN=ATTN1,SCIP=SCIP1

The LU 6.2 requirements for EXLST exit routines other than the ATTN exit are discussed here. For a full discussion of the EXLST macroinstruction and these exit routines, refer to z/OS Communications Server: SNA Programming.