#!/usr/bin/perl

use Inline C;
use strict;

toggle_lights();

__END__
__C__
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/kd.h>

#define ERROR -1

void toggle_lights() {
        int fd;
        int i = 0;
        long int orig = 0;

        if ((fd = open("/dev/console", O_NOCTTY)) == ERROR) {
                perror("cannot open console");
                exit(ERROR);
        }

        ioctl(fd, KDGETLED, &orig);

        i |= LED_NUM;
        ioctl(fd, KDSETLED, i);
        sleep( 2 );

        i = 0;
        i |= LED_CAP;
        ioctl(fd, KDSETLED, i);
        sleep( 2 );

        i = 0;
        i |= LED_SCR;
        ioctl(fd, KDSETLED, i);
        sleep( 2 );

        ioctl(fd, KDSETLED, orig);
}