TTY: Add tty ioctl to figure device node of the system console.

This has been in the SuSE kernels for a very long time.

Signed-off-by: Werner Fink <werner@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index be5ab4ac0b93..d2333ab23d07 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2618,6 +2618,11 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                 return put_user(tty->ldisc->ops->num, (int __user *)p);
         case TIOCSETD:
                 return tiocsetd(tty, p);
+        case TIOCGDEV:
+        {
+                unsigned int ret = new_encode_dev(tty_devnum(real_tty));
+                return put_user(ret, (unsigned int __user *)p);
+        }
         /*
          * Break handling
          */