Common Tape System › Online Label Interface (LAB) › LAB Description

LAB Description

When LAB is started, it initiates the label processor and waits for either the label processor to complete or a command from the operator to be entered.

The label processor completes under any of the following conditions:

• The label input processor received a CLOSE request
• An error was detected in the CA Earl component
• An end-of-file condition was forced in the CA Earl component
• A fatal error occurred in either the input or output label processor
• A STOP or CANCEL command was passed to the LAB subtask

The CLOSE request shuts down the entire label process in a normal fashion. CA Common Services for z/OS Services CAICCI used in the input processor is terminated. The CA Earl component receives the CLOSE request which in turn is passed to the output label processor, requesting it to close all opened files and terminate any use of CA Common Services for z/OS Services CAICCI.

The following command in the LAB subtask is used to send the CLOSE request to the label processor.

F CTS,STOP LAB

or

F CTS,MSG LAB,STOP

If the CA Earl component detects an error, it forces an END-OF-FILE condition which in turn requests the label processor to shut down. The same is true for any fatal errors that may occur.