#include <signal.h>
#include <setjmp.h>
#include <stdio.h>

/* jmp_buf context; */
sigjmp_buf context;

int yog(int n)
{
   char *p=NULL;

   printf("pass %d\n", n);

   if (n<=2)
     return 1;

   strcpy(p, "dfldflflmflkklfklflkmfdlfldfldlfdlkfd");        // must crash of course !!!
   return 1;

}

void resume(int sig)
{
/*   longjmp(context, 6); */
   siglongjmp(context, 6);
   //signal(SIGSEGV, resume);

}

int main(void)
{
   int sig, i;
   char *x=NULL;
   sigset_t nset, oset;

   for (i=0; i<3; i++)
   {
     /* Remove SIGSEGV from the list of blocked signals if you use 
      * setjmp/longjmp instead of sigsetjmp/siglongjmp. */
     sigemptyset (&nset);
     sigaddset(&nset, SIGSEGV);
     sigprocmask (SIG_UNBLOCK, &nset, &oset);
     signal(SIGSEGV, resume);
     
/*     sig = setjmp(context);*/
     sig = sigsetjmp(context, 1);

     if (sig == 0)
     {
       yog(1);
       yog(2);
       yog(3);
       //return 555;
     }
     else
     {
       fprintf(stderr, "ouch -- signal %d\n", sig);
     }
   }

   puts("end");
   return 0;

}