#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/kd.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>

int main(int argc, char* argv[]) {

	int fd = open("/dev/console", O_WRONLY);

	if (fd < 0) {
		printf("can't open console\n");
		return fd;
	}

	if (geteuid()) {
		printf("use:\n\tsudo %s\n", argv[0]);
		return -1;
	}

	for (int t=0;;t++) {
		int val = (t*(((t>>12)|(t>>8))&(63&(t>>4))));
		printf("%d\n", val);
		ioctl(fd, KIOCSOUND, val);
		usleep(25000);
	}

	return 0;
}