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

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

void traite_SIGTERM(int sig)
{
  /* Ok */
}

main(int argc, char *argv[])
{
  int idshm;
  int *p;
  char *code = argv[1];
  int pid;
  int i;
  sigset_t ens;

  struct sigaction action;

  action.sa_handler = traite_SIGTERM;
  sigfillset(&action.sa_mask); 
  action.sa_flags = 0;
  sigaction(SIGTERM,&action,NULL);
 
  sigfillset(&ens);
  sigdelset(&ens,SIGTERM);

  idshm = shmget(key,2*sizeof(int),IPC_CREAT|0777);

  p = shmat(idshm,NULL,0);

  *p = getpid();

  while(*(p+1)==0);

  pid = *(p+1);

  for(i=0;i<strlen(code);i++)
    {
      switch(code[i]) {
      case '.' : kill(pid,SIGUSR1); sigsuspend(&ens); break;
      case '_' : kill(pid,SIGUSR2); sigsuspend(&ens); break;
      case ' ' : kill(pid,SIGINT); sigsuspend(&ens); break;
      }
    }

  shmdt(p);

  shmctl(idshm,IPC_RMID,NULL);

  exit(0);
}