longjmp - meaning and definition. What is longjmp
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What (who) is longjmp - definition

HEADER FILE
Setjmp; Longjmp; Setjmp/longjmp; Csetjmp; Setjump; Std::setjmp; Std::longjmp

Setjmp.h         
setjmp.h is a header defined in the C standard library to provide "non-local jumps": control flow that deviates from the usual subroutine call and return sequence.

Wikipedia

Setjmp.h

setjmp.h is a header defined in the C standard library to provide "non-local jumps": control flow that deviates from the usual subroutine call and return sequence. The complementary functions setjmp and longjmp provide this functionality.

A typical use of setjmp/longjmp is implementation of an exception mechanism that exploits the ability of longjmp to reestablish program or thread state, even across multiple levels of function calls. A less common use of setjmp is to create syntax similar to coroutines.