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#include <stdio.h>
#include <setjmp.h>
static jmp_buf buf;
void second(void) {
printf("second\n");
longjmp(buf, -1);
}
void first(void) {
printf("first\n"); // prints
longjmp(buf, 1); // jumps back to where setjmp was called - making setjmp now
// return 1
}
int main() {
volatile int x = 0;
int jmpval = setjmp(buf);
if (!jmpval) {
x++; // should be properly restored once longjmp jumps back
first(); // when executed, setjmp returns 1
printf("skipped\n"); // does not print
} else if (jmpval == 1) { // when first() jumps back, setjmp returns 1
printf("result: %d %d\n", x, jmpval); // prints
x++;
second(); // when executed, setjmp returns -1
} else if (jmpval == -1) { // when second() jumps back, setjmp returns -1
printf("result: %d %d\n", x, jmpval); // prints
}
return 0;
}
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