linux-kbmode.c

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

int main (int argc, char *argv[]) {
	setlocale (LC_ALL, "");
	if (argc < 2) {
		fprintf (stderr, "Usage: %s <file> <mode>\n", argv[0]);
		return 1;
	}

	int fd = open (argv[1], O_RDWR);
	if (fd < 0) {
		perror ("open");
		return 2;
	}

	int mode;
	if (ioctl (fd, KDGKBMODE, &mode) < 0) {
		perror ("ioctl KDGKBMODE");
		return 3;
	}

	printf ("%d\n", mode);
	if (argc < 3) {
		return 0;
	}

	if (sscanf (argv[2], "%d", &mode) != 1) {
		perror ("sscanf");
		return 4;
	}

	if (ioctl (fd, KDSKBMODE, mode) < 0) {
		perror ("ioctl");
		return 5;
	}
	return 0;
}