tty: add TIOCVHANGUP to allow clean tty shutdown of all ttys

This is useful for system management software so that it can kick
off things like gettys and everything that's started from a tty,
before we reuse it from/for something else or shut it down.

Without this ioctl it would have to temporarily become the owner of
the tty, then call vhangup() and then give it up again.

Cc: Lennart Poettering <lennart@poettering.net>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/alpha/include/asm/ioctls.h b/arch/alpha/include/asm/ioctls.h
index 034b6cf5d9f3..80e1cee90f1f 100644
--- a/arch/alpha/include/asm/ioctls.h
+++ b/arch/alpha/include/asm/ioctls.h
@@ -94,6 +94,7 @@
 #define TIOCSPTLCK      _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV        _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG         _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP     0x5437
 
 #define TIOCSERCONFIG   0x5453
 #define TIOCSERGWILD    0x5454