C setjump and longjump

“Setjump” and “Longjump” are defined in setjmp.h, a header file in C standard library.

• setjump(jmp_buf buf) : uses buf to remember the current position and returns 0.
• longjump(jmp_buf buf, i) : Go back to the place buf is pointing to and return i.

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The main feature of these functions is to provide a way that deviates from standard call and return sequences. This is mainly used to implement exception handling in C. setjmp can be used like try (in languages like C++ and Java). The call to longjmp can be used like throw (Note that longjmp() transfers control to the point set by setjmp()).