Parameter Descriptions

All of the parameters of the callable services are required, positional parameters. Some programming languages let you pass literal values in these parameters. None of the parameters are optional.

APPC/MVS checks all parameters for valid values, regardless of whether the parameters are used in call processing. For example, the locks parameter on the Prepare_to_Receive service must contain either a 0 or 1 (the only valid values), otherwise APPC/MVS rejects the request to change to receive state with a program_parameter_check return code, regardless of what value is supplied in Prepare_to_receive_type.

See CPI-C Reference for descriptions of the parameters of the CPI Communications services.