int glob = 6;
int main(void)
{
  int var;
  pid_t pid;
  var = 88;
  printf("before vfork\n");
  if ((pid = vfork()) < 0) {
    err_sys("vfork error");
  } else if (pid == 0) { 
      glob++;
     var++;
     _exit(0);
  }
  printf("pid = %d, glob = %d, var = %d\n", getpid(), glob, var);
  exit(0);
}