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

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

int *p;

void traite_sig(int sig)
{
  alarm(7);
  switch(sig) {
  case SIGUSR1 : printf("."); fflush(stdout); kill(*p,SIGTERM); break; 
  case SIGUSR2 : printf("_"); fflush(stdout); kill(*p,SIGTERM); break; 
  case SIGINT  : printf(" "); fflush(stdout); kill(*p,SIGTERM); break; 
  }
}

void traite_SIGALRM(int sig)
{
  printf("'\n");
  shmdt(p);
  exit(0);
}

main()
{
  int idshm;

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

  p = shmat(idshm,NULL,0);

  printf("J'ai recu '");fflush(stdout);

  struct sigaction action;

  action.sa_handler = traite_sig;
  sigfillset(&action.sa_mask); 
  action.sa_flags = 0;
  sigaction(SIGUSR1,&action,NULL);
  sigaction(SIGUSR2,&action,NULL);
  sigaction(SIGINT,&action,NULL);
  action.sa_handler = traite_SIGALRM;
  sigaction(SIGALRM,&action,NULL);

  *(p+1) = getpid();

  while(*p==0);

  alarm(7);
  while(1);
}