[ [operation_attribute, ...] ] type_specifier operation_identifier (parameter_declaration, ...); [ [operation_attribute, ...] ] type_specifier operation_identifier ( [void] );

The operation declaration defines a function for actual processing.

operation_attribute

Specify an operation attribute. The following attribute can be specified:

• transaction_mandatory
  Indicates that the transaction must be expanded.
  
• transaction_optional
  Indicates that the transaction is expanded for transaction processing.
  

type_specifier

Specify a data type. If a data type is returned from the operation, specify that data type. Specify a scalar type or predefined type. If no result is returned, specify void. The permitted type is integer.

operation_identifier

Specify an operation name. Up to 30 characters can be specified.

parameter_declaration

Specify a parameter declaration. It declares an operation parameter.

1. The transaction_mandatory and transaction_operation attributes cannot be specified at the same time.
2. Use a complete pointer for a value returned from the operation.

• The context_handle attribute cannot be used.
• The ptr attribute cannot be used.
• The string attribute cannot be used.
• The transaction_mandatory and transaction_optional attributes are valid only if the communicating processes are both ndce processes.
• Only error_status_t can be used for type_specifier with the corresponding version. If a system or stub error occurs, its error code is returned. The return value of the operation function is returned only when the operation terminates normally. Do not specify the pointer or array for error_status_t.