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Sometimes when your program detects an unusual situation inside a deeply
nested set of function calls, you would like to be able to immediately
return to an outer level of control. This section describes how you can
do such non-local exits using the
23.1 Introduction to Non-Local Exits When and how to use these facilities. 23.2 Details of Non-Local Exits Functions for non-local exits. 23.3 Non-Local Exits and Signals Portability issues. 23.4 Complete Context Control Complete context control a la System V.
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