#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>

#define key ftok("./clef",13)

main()
{
  int idshm;
  int *p;

  idshm = shmget(key,2*sizeof(int),0);

  p = shmat(idshm,NULL,0);

  printf("Je suis %d\n",getpid());

  *(p+1) = getpid();

  while(*p==0);

  printf("L'autre est %d\n",*p);

  shmdt(p);

  exit(0);
}