Question

What is the function of the given longjump(jmp_buf buf, i)?

(a) go back to place buf is pointing to and return i

(b) go back to place buf is pointing to and return 0

(c) uses buf to remember current position and returns 0

(d) uses buf to remember current position and returns i

I have been asked this question in an interview for internship.

I'd like to ask this question from Non-Local Jumps in portion C Library of C

Answer 1

Right answer is (a) go back to place buf is pointing to and return i

Explanation: In the given function longjmp(jmp_buf buf,i), it goes back to place buf is pointing to and return i.setjmp(jmp_buf  buf) uses buf to remember current position to and return 0.