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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);
}
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