Communications Blocks and Error Detection › DC/UCF General Registers

DC/UCF General Registers

General registers 0, 1, and 15 pass information about data communication services from the DC/UCF system to the application program. The registers are used in the following manner:

• Register 0 is used by several DC/UCF commands to return information regarding specific parameters of the DML statement.
• Register 1 is sometimes used to either store the address of the IDMS communications block after an I/O error occurs during execution of a DML command, or to receive information from the DC/UCF system regarding certain status conditions that are associated with a return code.
• Register 15 is used to receive the return code from the system after execution of a DML verb that requests a data communications service.

  The value of the return code in register 15 indicates whether a DML request for data communication services was successful. The return codes issued by the system after execution of a DML statement are listed on the following pages.

Note: If your program uses DML commands to request data communication services and to access the CA IDMS/DB database, you must check register 15 for return codes issued by the DC/UCF system, and the ERRSTAT field of the IDMS communications block for the status codes issued by CA IDMS/DB.