The return code specifies the general result of the callable service. Appendix A. ICSF and TSS Return and Reason Codes lists the return codes.

The reason code specifies the result of the callable service that is returned to the application program. Each return code has different reason codes that are assigned to it that indicate specific processing problems. Appendix A. ICSF and TSS Return and Reason Codes lists the reason codes.

The length of the data that is passed to the installation exit. The length can be from X'00000000' to X'7FFFFFFF' (2 gigabytes). The data is identified in the exit_data parameter.

The data that is passed to the installation exit.

The number of keywords you supplied in the rule_array parameter. The value must be 0.

Keywords that provide control information to the callable service. Currently there are no keywords that are defined for this variable, but you must declare the variable. To do so, declare an area of blanks of any length.

The length of the user-supplied text parameter for which the service should calculate the EDC.

The application-supplied text field for which the service is to generate the EDC.

An 18-byte string that ICSF uses as a system work area. The chaining vector permits data to be chained from one call to another. ICSF ignores the information in this field, but you must declare an 18-byte string.

A 9-byte field where the callable service returns the EDC generated as two groups of four ASCII-encoded hexadecimal characters that are separated by an ASCII space character.