a setjmp/longjmp example

setjmp_example.c

#include <stdio.h>
#include <setjmp.h>
 
jmp_buf test1;
 
void tryjump () {
    longjmp(test1, 3);
}
 
int main (void) {
    if ( setjmp (test1) == 0 ) {
        printf ("setjmp() returned 0.");
        tryjump ();
    } 
    else {
        printf ("setjmp returned from a longjmp call.");
    }
}