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Console events and accessibility

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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>
This commit is contained in:
Samuel Thibault
2007-10-18 23:39:17 -07:00
committed by Linus Torvalds
parent fe9d4f5763
commit b293d75847
3 changed files with 62 additions and 1 deletions
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6
include/linux/notifier.h
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@@ -242,5 +242,11 @@ static inline int notifier_to_errno(int ret)
extern struct blocking_notifier_head reboot_notifier_list;
/* Virtual Terminal events. */
#define VT_ALLOCATE 0x0001 /* Console got allocated */
#define VT_DEALLOCATE 0x0002 /* Console will be deallocated */
#define VT_WRITE 0x0003 /* A char got output */
#define VT_UPDATE 0x0004 /* A bigger update occurred */
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */

12
include/linux/vt.h
View File

@@ -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).