Re: Escape sequences & console

Re: Escape sequences & console

[Simon Richter]

On Thu, 1 Mar 2001, Sébastien HINDERER wrote:

> Could someone tell me where I can find a document listing all the
> escape-sequences that could be sent to the console (/dev/console) and what
> they do.

Please don't use those sequences directly, as not everyone has
/dev/console on a vt. You can find the information you want in your local
terminfo database under "linux".

   Simon

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Re: Escape sequences & console

[H. Peter Anvin]

Followup to:  <Pine.LNX.4.31.0103011919490.23240-100000@phobos.fachschaften.tu-muenchen.de>
By author:    Simon Richter <Simon.Richter@phobos.fachschaften.tu-muenchen.de>
In newsgroup: linux.dev.kernel
>
> On Thu, 1 Mar 2001, Sébastien HINDERER wrote:
> 
> > Could someone tell me where I can find a document listing all the
> > escape-sequences that could be sent to the console (/dev/console) and what
> > they do.
> 
> Please don't use those sequences directly, as not everyone has
> /dev/console on a vt. You can find the information you want in your local
> terminfo database under "linux".
> 

Well, don't use them directly without checking that $TERM is "linux".
Also, normally they should be sent to the current terminal (/dev/tty,
or just stdout) rather than /dev/console.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt

Escape sequences & console

[Sébastien HINDERER]

Hi all,

Could someone tell me where I can find a document listing all the
escape-sequences that could be sent to the console (/dev/console) and what
they do.
Thank you: Sébastien.

Re: Escape sequences & console

[Guest section DW]

On Thu, Mar 01, 2001 at 07:03:50PM -0000, Sébastien HINDERER wrote:

> Could someone tell me where I can find a document listing the
> escape-sequences that could be sent to the console and what
> they do.

man console_codes

Re: Escape sequences & console

[Sébastien HINDERER]

OKAY, but something strange appears:
According to linux/drivers/console.c, function setterm_commands, case 12,
one can change the virtual console by sending an escape sequence to
/dev/cnsole (what I want to do), hower, this is not documented in man
pages.
Which escape-sequence should I send to /dev/console to switch tty?
Thank you: Sébastien.



----------
> De : Simon Richter <Simon.Richter@phobos.fachschaften.tu-muenchen.de>
> A : Sébastien HINDERER <jrf3@wanadoo.fr>
> Cc : linux-kernel@vger.kernel.org
> Objet : Re: Escape sequences & console
> Date : jeudi 1 mars 2001 18:21
> 
> On Thu, 1 Mar 2001, Sébastien HINDERER wrote:
> 
> > Could someone tell me where I can find a document listing all the
> > escape-sequences that could be sent to the console (/dev/console) and
what
> > they do.
> 
> Please don't use those sequences directly, as not everyone has
> /dev/console on a vt. You can find the information you want in your local
> terminfo database under "linux".
> 
>    Simon
> 
> -- 
> GPG public key available from
http://phobos.fs.tum.de/pgp/Simon.Richter.asc
>  Fingerprint: DC26 EB8D 1F35 4F44 2934  7583 DBB6 F98D 9198 3292
> Hi! I'm a .signature virus! Copy me into your ~/.signature to help me
spread!
> NP: Inside Treatement - Klaustraph
> 
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Re: Escape sequences & console

[Guest section DW]

On Thu, Mar 01, 2001 at 08:48:10PM -0000, Sébastien HINDERER wrote:

> According to linux/drivers/console.c, function setterm_commands, case 12,
> one can change the virtual console by sending an escape sequence to
> /dev/cnsole (what I want to do), hower, this is not documented in man
> pages.

Hmm. How come I read

       ESC [ 12 ; n ]      Bring specified console to the front.

?

Re: Escape sequences & console

[Simon Richter]

On Thu, 1 Mar 2001, Sébastien HINDERER wrote:

> According to linux/drivers/console.c, function setterm_commands, case 12,
> one can change the virtual console by sending an escape sequence to
> /dev/cnsole (what I want to do), hower, this is not documented in man
> pages.

>From the source of the chvt program:

    if (ioctl(fd,VT_ACTIVATE,num)) {
        perror("chvt: VT_ACTIVATE");
        exit(1);
    }
    if (ioctl(fd,VT_WAITACTIVE,num)) {
        perror("VT_WAITACTIVE");
        exit(1);
    }

Where fd is /dev/tty, /dev/tty0, /dev/console or std{in,out,err} (From the
source, I doubt this ioctl works on all of those).

   Simon

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Re: Escape sequences & console

[H. Peter Anvin]

Followup to:  <Pine.LNX.4.31.0103022208050.30419-100000@phobos.fachschaften.tu-muenchen.de>
By author:    Simon Richter <Simon.Richter@phobos.fachschaften.tu-muenchen.de>
In newsgroup: linux.dev.kernel
> 
> From the source of the chvt program:
> 
>     if (ioctl(fd,VT_ACTIVATE,num)) {
>         perror("chvt: VT_ACTIVATE");
>         exit(1);
>     }
>     if (ioctl(fd,VT_WAITACTIVE,num)) {
>         perror("VT_WAITACTIVE");
>         exit(1);
>     }
> 
> Where fd is /dev/tty, /dev/tty0, /dev/console or std{in,out,err} (From the
> source, I doubt this ioctl works on all of those).
> 

/dev/tty0 would be the correct device (tty0 = current virtual
console.)

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt