Exit routine migration considerations

There are migration considerations for some exit routines when you migrate to IMS 15.4.

Service and enhancements to IMS can change or add information in the output of certain commands. Any exit routine or automation program that parses the output from these commands might need to be modified. Service changes to the output of a command are documented in ++HOLD statements that describe the changes.

Migration considerations introduced in IMS 15

IMS 15.4 and later systems obtain the user exit header block (UEHB) and any additional buffers that are passed to the DFSAOUE0 exit routine from 31-bit private storage.

The following user exit routines are removed from the IMS nucleus and are loaded as stand-alone load modules during IMS initialization:
  • DFSCMTU0
  • DFSCNTE0
  • DFSCSMB0 and user-defined from TRANSACT EDIT=
  • DFSCTTO0 and user-defined from TYPE EDIT= or LINEGRP EDIT=
  • DFSFEBJ0
  • DFSME000-DFSME127
  • DFSPIXT0 and user-defined from TYPE EDIT= or LINEGRP EDIT=
  • DFSSIML0

For more information about the migration considerations that are related to the removal of the preceding user exits from the IMS nucleus, see Migration considerations for removing user exit routine specification from system definition.