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#include <stdio.h>
#include <setjmp.h>
static jmp_buf buf;
void (*fp)() = NULL;
void second(void) {
printf("second\n"); // prints
longjmp(buf, 1); // jumps back to where setjmp was called - making setjmp now
// return 1
}
void first(void) {
fp();
printf("first\n"); // does not print
}
int main(int argc, char **argv) {
fp = argc == 200 ? NULL : second;
volatile int x = 0;
if (!setjmp(buf)) {
x++;
first(); // when executed, setjmp returns 0
} else { // when longjmp jumps back, setjmp returns 1
printf("main: %d\n", x); // prints
}
return 0;
}
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