Common Tape System › Online Label Interface › 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 Common Services for z/OS EARL Service component
• An end-of-file condition was forced in the CA Common Services for z/OS EARL Service 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 CAICCI used in the input processor is terminated. The CA Common Services for z/OS EARL Service 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 CAICCI.

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

F CTS,STOP LAB

or

F CTS,MSG LAB,STOP

Additionally, if the CA Common Services for z/OS EARL Service component detects an error, it forces an END-OF-FILE condition which in turn requests the label processor to shutdown. The same is true for any fatal errors that may occur.