#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

int main()
{
  char *shmaddr;
  char *shmaddr2;

  int id = shmget (IPC_PRIVATE, 4, IPC_CREAT | 0600);
  if (id == -1) return 2;
  shmaddr = shmat (id, 0, 0);
  shmctl (id, IPC_RMID, 0);
  shmaddr2 = (char *)shmat (id, 0, 0);

  if ((char*) shmaddr2 == (char*) -1) {
    shmdt (shmaddr);
    return 1;
  }

  shmdt (shmaddr);
  shmdt (shmaddr2);

  return 0;
}