Console events and accessibility

Some external modules like Speakup need to monitor console output.

This adds a VT notifier that such modules can use to get console output events:
allocation, deallocation, writes, other updates (cursor position, switch, etc.)

[akpm@linux-foundation.org: fix headers_check]
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/vt.h b/include/linux/vt.h
index ba806e8711be..02c1c0288770 100644
--- a/include/linux/vt.h
+++ b/include/linux/vt.h
@@ -1,6 +1,18 @@
 #ifndef _LINUX_VT_H
 #define _LINUX_VT_H
 
+#ifdef __KERNEL__
+struct notifier_block;
+
+struct vt_notifier_param {
+        struct vc_data *vc;     /* VC on which the update happened */
+        unsigned int c;         /* Printed char */
+};
+
+extern int register_vt_notifier(struct notifier_block *nb);
+extern int unregister_vt_notifier(struct notifier_block *nb);
+#endif
+
 /*
  * These constants are also useful for user-level apps (e.g., VC
  * resizing).