linux-kernel - Re: [PATCH] vc bell config

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Date:	Fri, 5 Oct 2007 17:00:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	linux-kernel@...r.kernel.org, adaplas@...il.com
Subject: Re: [PATCH] vc bell config

On Fri, 5 Oct 2007 13:55:52 +0200 (CEST)
Jan Engelhardt <jengelh@...putergmbh.de> wrote:

> 
> It is already possible to deactivate the vc bell on a per-tty basis,
> by using echo -en "\e[11;0]", but this is reset on reset(1).
> 
> This adds a sysfs parameter to globally control the vc bell, as well
> as sysfs parameters for default pitch and duration.
> 

Why do we need this?  To fix the stupid-app-makes-my-box-beep problem, I
guess.  Is there no other way of suppressing the beep? (no jokes about wire
cutters or earplugs, please).


> ---
>  drivers/char/vt.c |   18 +++++++++++-------
>  1 file changed, 11 insertions(+), 7 deletions(-)
> 
> Index: linux-2.6.23/drivers/char/vt.c
> ===================================================================
> --- linux-2.6.23.orig/drivers/char/vt.c
> +++ linux-2.6.23/drivers/char/vt.c
> @@ -134,8 +134,12 @@ const struct consw *conswitchp;
>  /*
>   * Here is the default bell parameters: 750HZ, 1/8th of a second
>   */
> -#define DEFAULT_BELL_PITCH	750
> -#define DEFAULT_BELL_DURATION	(HZ/8)
> +static unsigned int default_bell_pitch = 750;
> +static unsigned int default_bell_duration = HZ / 8;

It is inapt to call these default_X.  Because once they have been altered
by the user, they aren't defaults any more.

They should be just bell_pitch and bell_duration.

-
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