6.8. Performing a Nonlocal Goto: setjmp() and long jmp()

The setjmp() and longjmp() library functions are used to perform a nonlocal goto. The term nonlocal refers to the fact that the target of the goto is a location somewhere outside the currently executing function.

Like many programming languages, C includes the goto statement, which is open to endless abuse in making programs difficult to read and maintain, and is occasionally useful to make a program simpler, faster, or both.