Example 3. Volatile for Local Variables With setjmp

#include <stdlib.h>
jmp_buf context;
void function()
{
    volatile int x = 3;
    switch(setjmp(context))
    {
        case 0: setup(); break;
        default:
        {
           /* We only reach here if longjmp occurs. Because x's lifetime begins before setjmp  
              and lasts through longjmp, the C standard requires x be declared "volatile". */
           printf("x == %d\n", x); 
           break;
        }
    }
}