Set_Send_Type

The Set_Send_Type call (function name cmsst) specifies how data will be sent by the next Send_Data call. It overrides the default send type established by Initialize_Conversation or Accept_Conversation. The default send type is CM_BUFFER_DATA, indicating that data only (and no control information) is to be sent.

The send_type value affects all subsequent Send_Data calls. It can be changed by reissuing Set_Send_Type.

CM_ENTRY Set_Send_Type(
  unsigned char FAR *conversation_ID,  
  CM_INT32 FAR *send_type,             
  CM_INT32 FAR *return_code            
);
 

Parameters

conversation_ID

Supplied parameter. Specifies the identifier for the conversation. The value of this parameter was returned by Initialize_Conversation or Accept_Conversation.

send_type

Supplied parameter. Specifies how data is sent by the next Send_Data call. Possible values are:

CM_BUFFER_DATA

The data pointed to by Send_Data is stored in a buffer until the buffer fills up or is flushed.

CM_SEND_AND_FLUSH

The data pointed to by Send_Data is to be sent immediately.

CM_SEND_AND_CONFIRM

The data is to be sent immediately with a request for confirmation.

CM_SEND_AND_PREP_TO_RECEIVE

The data is to be sent immediately along with notification to the partner program that the conversation state for the sending program is changing to RECEIVE.

CM_SEND_AND_DEALLOCATE

The data is to be sent immediately along with deallocation notification.

return_code

The code returned from this call. The valid return codes are listed below.

Return Codes

cm_ok

Primary return code; the call executed successfully.

cm_program_parameter_check

Primary return code; one of the following occurred:

• The value specified by conversation_ID or send_type is invalid.
• The send_type parameter is set to CM_SEND_AND_CONFIRM, but the conversation's synchronization level is set to CM_NONE.

cm_product_specific_error

Primary return code; a product-specific error occurred and has been logged in the product's error log.

State Changes

The conversation can be in any state except RESET.

There is no state change.

Remarks

The send_type values that cause additional information to be sent with the data pointed to by Send_Data let you economize on the number of calls issued. The following table summarizes Send_Data equivalences.