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

main()
{
  int (*f0)();
 
  printf("Control-c activo\n");
  sleep(3);
  f0= signal(SIGINT, SIG_IGN);   
  printf("Control-c inactivo\n");
  sleep(3);
  signal(SIGINT, f0);
  printf("Control-c activo\n");
  sleep(3);
  printf("Adeusinho!\n");
}