16.20 - DBCHUE - Teradata Tools and Utilities

Teradata® Call-Level Interface Version 2 Reference for Mainframe-Attached Systems

Teradata Tools and Utilities
September 2019
Programming Reference


Called by the application to add a user-provided event to CLIv2’s internal wait list.


This routine is called with the following parameters, stylistically presented (the actual syntax varies according to the programming language being used):

DBCHUE(ReturnCode,ContextArea,User event,DBCHUEP)

In high-level languages, the details of the parameter list are handled by the compiler. For Assembler, the parameter list consists of contiguous 4 byte entries, each containing the 31 bit address of a parameter. The last address has the first bit set to one to indicate the end of the list.

The parameters for this routine are:

Argument Content
ReturnCode A 4 byte unsigned integer field into which the return code will be placed by CLIv2.
ContextArea A 4 byte unsigned integer field for internal use by CLIv2.
UserECB When defining a user event (DBCHUEP function code 1), address of the application allocated area for use as the User ECB. When deleting a user event (DBCHUEP function code 2), this parameter must be present but is not used by DBCHUE.

For CICS applications, the User ECB must be in SHARED storage.

DBCHUEP User Event Parameters (UEP)

Usage Notes

  • The DBCHUE routine does not itself wait for completion of any event.
  • Only one User ECB is honored at a time; only the last one added has an effect.
  • For compatibility with the DBCHUEC service, the User ECB may be deleted by specifying a User ECB address of binary zeroes. The preferred method to delete a user event is to use a function code of 2.
  • The User ECB remains in effect until explicitly removed.
  • CLIv2 reflects the completion of the event associated with the User ECB by a return code of 160. Any time CLIv2 must wait for the completion of an event, the User ECB is checked. Before reflecting this return code to the application, the indicator that it has been posted in the User ECB is cleared.
  • After the call, the return code variable will contain a return code.
  • After the call, CLIv2 will change ContextArea for its own purposes.

User Event Parameters

The following table defines the DBCHUEP area. The field is set by the application.

The field names in all languages are the same, except that the C field names are case-sensitive.

Field Name Offset Length Description
UEPFUNC (uepFunc) 00 4 Unsigned numeric function to be performed.

Valid function codes and their descriptions are listed in the table following this table.


In the UEPFUNC field, the following are valid function codes:

Function Code Name Mnemonic for All Languages, Including C Description
1 Define UEPFDEF Define a user event.
2 Delete UEPFDEL Delete a user event.