diff options
| author | Karl Dahlke <eklhad@comcast.net> | 2008-04-28 02:14:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:32 -0700 |
| commit | 0341a4d0fdd2a0a3d9e2bb3a9afef9f8292c8502 (patch) | |
| tree | e073b06ad0d0e4a7d3aaed487db0655feadb31bb | |
| parent | f7440b0ecdeb3a04d07c546d02d29700d2a574b7 (diff) | |
VT notifier extension for accessibility
Some accessibility modules need to be able to catch the output on the
console before the VT interpretation, and possibly swallow it.
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/char/vt.c | 8 | ||||
| -rw-r--r-- | include/linux/notifier.h | 1 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c index 9b58b894f823..df4c3ead9e2b 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -2054,6 +2054,7 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co unsigned long draw_from = 0, draw_to = 0; struct vc_data *vc; unsigned char vc_attr; + struct vt_notifier_param param; uint8_t rescan; uint8_t inverse; uint8_t width; @@ -2113,6 +2114,8 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co if (IS_FG(vc)) hide_cursor(vc); + param.vc = vc; + while (!tty->stopped && count) { int orig = *buf; c = orig; @@ -2201,6 +2204,11 @@ rescan_last_byte: tc = vc->vc_translate[vc->vc_toggle_meta ? (c | 0x80) : c]; } + param.c = tc; + if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE, + ¶m) == NOTIFY_STOP) + continue; + /* If the original code was a control character we * only allow a glyph to be displayed if the code is * not normally used (such as for cursor movement) or diff --git a/include/linux/notifier.h b/include/linux/notifier.h index f4df40038f0c..20dfed590183 100644 --- a/include/linux/notifier.h +++ b/include/linux/notifier.h @@ -247,6 +247,7 @@ extern struct blocking_notifier_head reboot_notifier_list; #define VT_DEALLOCATE 0x0002 /* Console will be deallocated */ #define VT_WRITE 0x0003 /* A char got output */ #define VT_UPDATE 0x0004 /* A bigger update occurred */ +#define VT_PREWRITE 0x0005 /* A char is about to be written to the console */ #endif /* __KERNEL__ */ #endif /* _LINUX_NOTIFIER_H */ |