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

int main()
{
    int fd;
    struct fb_var_screeninfo screen_info;

    fd = open("/dev/fb0", O_RDWR);
    ioctl(fd, FBIOGET_VSCREENINFO, &screen_info);
    printf("%d %d\n", screen_info.xres, screen_info.yres);

    return 0;
}