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

main()
{
  int i;

  signal(SIGINT, SIG_IGN);	/* ignore the signal */
  printf("I'm running ...\n");
  for (i=1; i<10; i++) {
    printf("Still going ...\n");
    sleep(1);
    if (i == 3)
      signal(SIGINT, SIG_DFL);	/* re-install default handler */
  }
}