linux-kernel - [PATCH] vt: Expose system-wide UTF-8 default setting via sysfs

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Message-ID: <4611ACCD.5000305@gmail.com>
Date:	Tue, 03 Apr 2007 09:24:29 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Andrew Morton <akpm@...l.org>
CC:	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Paul LeoNerd Evans <leonerd@...nerd.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] vt: Expose system-wide UTF-8 default setting via sysfs

Create a variable, default_utf8, that defines the system-wide default UTF-8
setting.  This variable can be altered via sysfs. If the variable is properly
set, this should mimimize breakage of UTF-8 encoded consoles when doing a
reset or echo -e '\033c' and of newly opened/allocated consoles.

This is based from patches by Jan Engelhardt and Paul LeoNerd Evans.

Signed-off-by: Antonino Daplas <adaplas@...il.com>
---
> I think you're missing the whole point of console reset.  Its purpose is 
> to force the console into a known-good state.  The fewer pieces of state 
> it leaves unset, the better.  To some degree it's less important what 
> that state actually is.

Okay, you convinced me. Hopefully this is acceptable to all parties.

Andrew,

If everybody agrees, can you drop the previous patch I sent to you, and use
this instead?

Tony

 drivers/char/vt.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 1bbb45b..8aca96f 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -157,6 +157,8 @@ static void blank_screen_t(unsigned long
 static void set_palette(struct vc_data *vc);
 
 static int printable;		/* Is console ready for printing? */
+static int default_utf8;
+module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 
 /*
  * ignore_poke: don't unblank the screen when things are typed.  This is
@@ -1497,7 +1499,7 @@ static void reset_terminal(struct vc_dat
 	vc->vc_charset		= 0;
 	vc->vc_need_wrap	= 0;
 	vc->vc_report_mouse	= 0;
-	vc->vc_utf		= 0;
+	vc->vc_utf              = default_utf8;
 	vc->vc_utf_count	= 0;
 
 	vc->vc_disp_ctrl	= 0;
-
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