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/* this is userspace utility which allows you to redirect console to another fb device
* You can specify devices & consoles by both numbers and devices. Framebuffers numbers
* are zero based (/dev/fb0 ... ), consoles begins with 1 (/dev/tty1 ... )
*/
#include <linux/fb.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char* argv[]) {
struct fb_con2fbmap c2m;
char* fbPath;
u_int32_t con, fb;
char* e;
char* progname = strrchr(argv[0], '/');
int f;
if (progname)
progname++;
else
progname = argv[0];
if (argc < 3) {
fprintf(stderr, "usage: %s fbdev console\n", progname);
return 1;
}
fb = strtoul(argv[1], &e, 10);
if (*e) {
struct stat sbf;
if (stat(argv[1], &sbf)) {
fprintf(stderr, "%s: are you sure that %s can be used to describe fbdev?\n", progname, argv[1]);
return 1;
}
if (!S_ISCHR(sbf.st_mode)) {
fprintf(stderr, "%s: %s must be character device\n", progname, argv[1]);
return 1;
}
fb = sbf.st_rdev & 0xFF;
if (fb >= 32)
fb >>= 5;
fbPath = argv[1];
} else
fbPath = "/dev/fb0";
con = strtoul(argv[2], &e, 10);
if (*e) {
struct stat sbf;
if (stat(argv[2], &sbf)) {
fprintf(stderr, "%s: are you sure that %s can be used to describe vt?\n", progname, argv[2]);
return 1;
}
if (!S_ISCHR(sbf.st_mode)) {
fprintf(stderr, "%s: %s must be character device\n", progname, argv[2]);
return 1;
}
con = sbf.st_rdev & 0xFF;
}
c2m.console = con;
c2m.framebuffer = fb;
f = open(fbPath, O_RDWR);
if (f < 0) {
fprintf(stderr, "%s: Cannot open %s\n", progname, fbPath);
return 1;
}
if (ioctl(f, FBIOPUT_CON2FBMAP, &c2m)) {
fprintf(stderr, "%s: Cannot set console mapping\n", progname);
close(f);
return 1;
}
close(f);
return 0;
}
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