From owner-freebsd-hackers  Mon Nov  6  7:38:37 2000
Delivered-To: freebsd-hackers@freebsd.org
Received: from citadel.cequrux.com (citadel.cequrux.com [192.96.22.18])
	by hub.freebsd.org (Postfix) with ESMTP id A557937B479
	for <freebsd-hackers@freebsd.org>; Mon,  6 Nov 2000 07:38:29 -0800 (PST)
Received: (from nobody@localhost) by citadel.cequrux.com (8.8.8/8.6.9) id RAA15776 for <freebsd-hackers@freebsd.org>; Mon, 6 Nov 2000 17:38:20 +0200 (SAST)
Received: by citadel.cequrux.com via recvmail id 15675; Mon Nov  6 17:37:22 2000
Message-ID: <3A06B7A7.7665C46A@cequrux.com>
Date: Mon, 06 Nov 2000 15:52:39 +0200
From: Graham Wheeler <gram@cequrux.com>
Organization: Cequrux Technologies
X-Mailer: Mozilla 4.5 [en] (X11; I; FreeBSD 3.4-RELEASE i386)
X-Accept-Language: en
MIME-Version: 1.0
To: freebsd-hackers@freebsd.org
Subject: Help writing a screen saver module
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Hi all

I am trying to write a screen saver module that, when it kicks in, will
switch to the first console, and then, if a key is pressed, will switch 
back to the one that was previously active. The idea is that the first
console has something useful running on it, typically a tail -f of the
logs.

The code that I have at the moment is based on other simple saver
modules, and the VT_ACTIVATE ioctl code in syscons.c. However, it just
causes a reboot. This isn't a very important piece of code, but before I
give up on trying to get it to work, I thought I'd throw it out here and
see if anyone has any ideas.

Here are the two externally visible routines I've added to syscons.c:

----------------------------------------------------------------------

extern int ActivateConsole(int n);
extern int GetActiveConsole(void);

int ActivateConsole(int n)
{
    int s = spltty();
    sc_clean_up(cur_console);
    splx(s);
    return switch_scr(cur_console, n);
}

int GetActiveConsole(void)
{
    return get_scr_num();
}

----------------------------------------------------------------------

Here is the module code:

----------------------------------------------------------------------
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/syslog.h>

#include <machine/md_var.h>
#include <machine/random.h>

#include <saver.h>

static int last_active, blanked;

extern int ActivateConsole(int);
extern int GetActiveConsole();

static int
switch_saver(video_adapter_t *adp, int blank)
{
    if (adp->va_info.vi_flags & V_INFO_GRAPHICS)
        return EAGAIN;

    if (blank) {
        if (!blanked) {
            blanked = 1;
            last_active = GetActiveConsole();
            ActivateConsole(0);
        }
    } else {
        if (blanked) {
            blanked = 0;
            ActivateConsole(last_active);
        }
    }
    return 0;
}

static int
switch_init(video_adapter_t *adp)
{
    (void)adp;
    last_active = blanked = 0;
    return 0;
}

static int
switch_term(video_adapter_t *adp)
{
    (void)adp;
    return 0;
}

static scrn_saver_t switch_module = {
    "switch_saver", switch_init, switch_term, switch_saver, NULL,
};

SAVER_MODULE(switch_saver, switch_module);


-- 
Dr Graham Wheeler                        E-mail: gram@cequrux.com
Director, Research and Development       WWW:    http://www.cequrux.com
CEQURUX Technologies                     Phone:  +27(21)423-6065
Firewalls/VPN Specialists                Fax:    +27(21)424-3656


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message