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

extern void exit();

void catchint( signum )
    int signum;
  {
    printf("\ncatchint: caught signal=%d\n", signum);
    printf("Ha ha ha! You can't stop me! I am invincible!!!\n\n");
  }

main()
  {
    int i;

    signal( SIGINT, catchint );

    for( i = 0; i < 12; i++ )
      {
	printf("Main program sleeping for 5 seconds, iteration i=%d...\n", i);
	sleep( 5 );
      }

    printf("Main program all done. Exiting now.\n");

    exit(0);

  }