GET_MESSAGE_SIZE returns the size of the current CA Gen message buffer. The reported message buffer size includes the NonStop RSC/MP header, CA Gen data, and user data.
When a MsgFlow parameter of 0 is passed into the main entry point, USEREXIT(), this indicates that the user exit is being called just after the response message is received from the requesting client. The message size returned is that of the message just received from the client.
When a MsgFlow parameter of 1 is passed into the main entry point, this indicates that the user exit is being called just before sending the response message to the requesting client. The message size returned is that of the message about to be sent to the client.
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