main(int argc, char * argv[])
{
   int i=0;
   pid_t pid;

   i++;
   printf ("i vale %d \n",i);
   if ((pid=fork())!=0)
       exit(0);
   sleep (1);
   if (i==MAX)
        exit(0);
   execl("./a.out", "./a.out", NULL);
   i