#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fb.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/mman.h>
#include <string.h>

int main()
{
	void *map;
	int fd;
	struct fb_var_screeninfo vi;
	struct fb_fix_screeninfo fi;
	struct fb_cmap cmap;

	setbuf(stdout, NULL);

	printf("opening /dev/fb0 ... ");
	fd = open("/dev/fb0", O_RDWR);
	if (fd < 0) {
		perror("opening /dev/fb0 failed");
		return 1;
	}
	printf("OK!\n");

	printf("getting framebuffer info (screeninfo) ... ");
	ioctl(fd, FBIOGET_FSCREENINFO, &fi);
	ioctl(fd, FBIOGET_VSCREENINFO, &vi);
	printf("OK!\n");

	printf("doing mmap ... ");
	map = mmap(NULL, 393216, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
	if (map == MAP_FAILED) {
		perror("mmap(/dev/fb0) failed");
		exit(0);
	}
	printf("OK!\n");

	printf("getting framebuffer info (cmap) ... ");
	ioctl(fd, FBIOGETCMAP, &cmap);
	printf("OK!\n");

	sleep(10);

	return 0;
}