Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

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5 Using Subsystem Break
If your application will be run in session mode, you can include a
subsystem break routine that allows a user running the program
interactively to interrupt a task being performed by the program. To
provide this capability you must include calls to a number of system
intrinsics and supply a special subroutine that will run when
subsystem break is invoked.
This chapter describes the process of implementing a subsystem break
handler in your program. It includes discussions of the following:
• Intrinsics required to enable and perform subsystem break
processing.
• Intrinsics that control how subsystem break processing occurs.
• Sample procedures demonstrating the use of these intrinsics.
• Additional considerations for allowing subsystem break in a
program.