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Which function restores the environment saved by the most recent invocation of the setjmp() macro in the same invocation of the program?

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Which function restores the environment saved by the most recent invocation of the setjmp() macro in the same invocation of the program?

(a) jmp_buf

(b) longjmp

(c) jmpbuf

(d) long_jmp

I got this question during an internship interview.

Origin of the question is Non-Local Jumps topic in portion C Library of C

1 Answer

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Right option is (b) longjmp

Explanation: longjmp() is the only function defined under the header file setjmp.h. What setjmp() does is save the contents of the registers so that longjmp() can restore the contents later.

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