#include <stdio.h>
#include <signal.h>
#include <stdlib.h>

void traite_sig(int sig)
{
  alarm(10);
  switch(sig) {
  case SIGUSR1 : printf("."); fflush(stdout); break; 
  case SIGUSR2 : printf("_"); fflush(stdout); break; 
  case SIGINT  : printf(" "); fflush(stdout); break; 
  }
}

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


main()
{
  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);

  printf("Je suis %d\n",getpid()); 
  printf("'");fflush(stdout);
  alarm(10);
  while(1);
}