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How many times can the macro setjmp() return?

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How many times can the macro setjmp() return?

(a) one time

(b) two times

(c) three times

(d) many times

I had been asked this question in class test.

The question is from Non-Local Jumps topic in section C Library of C

1 Answer

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Best answer
The correct choice is (b) two times

Easiest explanation - setjmp() macro returns twice. First time, setjmp() returns zero on its direct invocation. Second time macro returns when longjmp is called with the information written to the environment; now, it returns the value passed to longjmp as second argument.

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