File: con2fbmap.c

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

#define DEFAULT_FRAMEBUFFER	"/dev/fb0"
#define DEFAULT_FRAMEBUFFER_DEVFS	"/dev/fb/0"

const char *programname;

void Usage(void)
{
    fprintf(stderr, "\nUsage: %s console [framebuffer]\n\n", programname);
    exit(1);
}

int main(int argc, char *argv[])
{
    int do_write = 0;
    char *fbpath; /* any frame buffer will do */
    int fd;
    struct fb_con2fbmap map;

    programname = argv[0];
    switch (argc) {
	case 3:
	    do_write = 1;
	    map.framebuffer = atoi(argv[2]);
	case 2:
	    map.console = atoi(argv[1]);
	    break;
	default:
	    Usage();
    }

    if (access("/dev/.devfsd", F_OK) == 0)  /* devfs detected */
	fbpath = DEFAULT_FRAMEBUFFER_DEVFS;
    else
	fbpath = DEFAULT_FRAMEBUFFER;

    if ((fd = open(fbpath, O_RDONLY)) == -1) {
	fprintf(stderr, "open %s: %s\n", fbpath, strerror(errno));
	exit(1);
    }
    if (do_write) {
	if (ioctl(fd, FBIOPUT_CON2FBMAP, &map)) {
	    fprintf(stderr, "ioctl FBIOPUT_CON2FBMAP: %s\n", strerror(errno));
	    exit(1);
	}
    } else {
	if (ioctl(fd, FBIOGET_CON2FBMAP, &map)) {
	    fprintf(stderr, "ioctl FBIOGET_CON2FBMAP: %s\n", strerror(errno));
	    exit(1);
	}
	printf("console %d is mapped to framebuffer %d\n", map.console,
	       map.framebuffer);
    }
    close(fd);
    exit(0);
}