Transaction Layer and I/O Errors

The transaction layer uses a cached connection object to send messages such as retransmitting requests or responses. In the event of a network error, the transaction layer releases the connection object. If the application registered a callback function for transaction error notification, the transaction layer invokes that function. If the application did not register a callback function for transaction error notification, or if the callback function returns a nonzero value, the stack terminates the transaction. If the callback function returns a value of zero, the stack does not release the cached object.