vt: add an event interface

This is needed and requested in various forms for ConsoleKit, screenblank
handling and the like so do the job with a single interface. Also build the
interface so that unlike VT_WAITACTIVE and friends it won't miss events.

FIXME: Should this be a waitactive ioctl or a new device file you can poll
and read events from. We need the code anyway to fix up the existing broken
wait for console switch logic but the ConsoleKit people would prefer the
new device to the ioctl we have here

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index e47a4c88976b..33214d92ca4c 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -252,7 +252,6 @@ static void notify_update(struct vc_data *vc)
         struct vt_notifier_param param = { .vc = vc };
         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 }
-
 /*
  *      Low-Level Functions
  */
@@ -935,6 +934,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 
         if (CON_IS_VISIBLE(vc))
                 update_screen(vc);
+        vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
         return err;
 }
 
@@ -3637,6 +3637,7 @@ void do_blank_screen(int entering_gfx)
                 blank_state = blank_vesa_wait;
                 mod_timer(&console_timer, jiffies + vesa_off_interval);
         }
+        vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
 }
 EXPORT_SYMBOL(do_blank_screen);
 
@@ -3681,6 +3682,7 @@ void do_unblank_screen(int leaving_gfx)
                 console_blank_hook(0);
         set_palette(vc);
         set_cursor(vc);
+        vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
 }
 EXPORT_SYMBOL(do_unblank_screen);