#include <sys/time.h>
#include <dev/wscons/wsconsio.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

int
main(int argc, char *argv[])
{
	int fd, vtnum;
	struct wsdisplay_addscreendata screendata;
	struct timeval t0, t1, dt;

	fd = open("/dev/ttyC0", O_RDWR);
	if (fd < 0)
		err(2, "open /dev/ttyC0");
	
	if (argc == 2) {
		vtnum = atoi(argv[1]);
		gettimeofday(&t0, NULL);
		if (ioctl(fd, WSDISPLAYIO_SETSCREEN, &vtnum) < 0)
			err(2, "SETSCREEN");
		gettimeofday(&t1, NULL);
		timersub(&t1, &t0, &dt);
		printf("vt switch took %lu %ld %lf ms\n",
		    (unsigned long)dt.tv_sec, (long)dt.tv_usec,
		    dt.tv_usec/1000.0);
	}
	screendata.idx = -1;
	if (ioctl(fd, WSDISPLAYIO_GETSCREEN, &screendata) < 0)
		err(2, "GETSCREEN");
	printf("Current VT: %d %s %s\n", screendata.idx,
	    screendata.screentype, screendata.emul);
	exit(0);
}