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#include <setjmp.h>
#include <stdio.h>
typedef struct {
jmp_buf* jmp;
} jmp_state;
void setjmp_func(jmp_state* s, int level) {
jmp_buf* prev_jmp = s->jmp;
jmp_buf c_jmp;
if (level == 2) {
printf("level is 2, perform longjmp!\n");
longjmp(*(s->jmp), 1);
}
if (setjmp(c_jmp) == 0) {
printf("setjmp normal execution path, level: %d\n", level);
s->jmp = &c_jmp;
setjmp_func(s, level + 1);
} else {
printf("setjmp exception execution path, level: %d\n", level);
if (prev_jmp) {
printf("prev_jmp is not empty, continue with longjmp!\n");
s->jmp = prev_jmp;
longjmp(*(s->jmp), 1);
}
}
printf("Exiting setjmp function, level: %d\n", level);
}
int main(int argc, char* argv[]) {
jmp_state s;
s.jmp = NULL;
setjmp_func(&s, 0);
return 0;
}
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