FEX-Emu/linux
1
0
Fork 0
mirror of https://github.com/FEX-Emu/linux.git synced 2024-12-15 05:11:32 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

VT notifier extension for accessibility

Browse Source 
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>
This commit is contained in:
Karl Dahlke 2008-04-28 02:14:25 -07:00 committed by Linus Torvalds
parent f7440b0ecd
commit 0341a4d0fd
2 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/char/vt.c
View File

@ -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,
&param) == 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

1
include/linux/notifier.h
View File

@ -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 */