NumLock hint update

T.B. van der Molen tbm at home.nl
Thu Dec 4 17:08:22 PST 2003


Here is an update of the NumLock hint. It should now conform to the new
format (applause not necessary).

-- 
Blessed is a world that is based upon a binary foundation.
-------------- next part --------------
AUTHOR: Tim van der Molen <tbm at home dot nl>
DATE: 2003-12-05
LICENSE: GNU Free Documentation License Version 1.2
SYNOPSIS: Automatically enabling NumLock when booting LFS and when starting X.
DESCRIPTION: See SYNOPSIS.
PREREQUISITES: The use of a System V-style booting process.
HINT:

This hint describes how to enable NumLock automatically when LFS is booted and
when X is started.

1. ENABLING NUMLOCK WHEN BOOTING LFS

We will create a simple boot script that will run setleds to enable NumLock on
all ttys. setleds is part of the kbd package which is installed on a default
LFS system. You might be happy to know that it can also set CapsLock and
ScrollLock. Refer to setleds(1) for more information.

Create the boot script:

	cat > /etc/rc.d/init.d/numlock << "EOF"
	#!/bin/sh

	source /etc/sysconfig/rc || exit 1
	source $rc_functions || exit 1

	echo "Enabling NumLock..."

	for tty in /dev/tty[1-6]; do
		/usr/bin/setleds -D +num < $tty
	done

	evaluate_retval
	EOF

If you use devfs, you probably want to replace "/dev/tty[1-6]" with
"/dev/vc/*".

Next, make the boot script executable:

	chmod 0755 /etc/rc.d/init.d/numlock

And finally, create a symlink from the /etc/rc.d/rcsysinit.d directory to the
boot script:

	ln -s ../init.d/numlock /etc/rc.d/rcsysinit.d/S90numlock

2. ENABLING NUMLOCK WHEN STARTING X

When started, X disables NumLock for some reason. So let us enable it once
again. There are different ways to accomplish this.

2.1. KDE

If you happen to run KDE, you can set NumLock to be enabled per default in
Control Center > Peripherals > Keyboard > Advanced.

2.2. NUMLOCKX

NumLockX allows you to enable and disable NumLock for X. It can be downloaded
from <http://freshmeat.net/projects/numlockx/>.

If you like it, you can compile and install it:

	./configure --prefix=/usr
	make
	make install

Then add the following line to the beginning of either the ~/.xinitrc,
~/.Xsession or ~/.Xclients file:

	/usr/bin/numlockx on

2.3. XSETLEDS

xsetleds can be considered to be the X equivalent of setleds. It can be
downloaded from <http://www.home.unix-ag.org/bmeurer/projects/xsetleds/>.

2.4. COMPILING A LITTLE PROGRAM YOURSELF

Perhaps the easiest way is to compile a little C program yourself which does
nothing more than changing the current state of NumLock. Thus, X disables
NumLock and this program enables it again. The source code of this program was
taken from an article in the SuSE Support Database at
<http://sdb.suse.de/en/sdb/html/cg_x11numlock.html>.

Create the C source file:

	cat > xsetnumlock.c << "EOF"
	#include <X11/extensions/XTest.h>
	#include <X11/keysym.h>

	int main(void)
	{
		Display* disp = XOpenDisplay(NULL);

		if (disp == NULL) return 1;

		XTestFakeKeyEvent(disp, XKeysymToKeycode(disp, XK_Num_Lock),
			True, CurrentTime);
		XTestFakeKeyEvent(disp, XKeysymToKeycode(disp, XK_Num_Lock),
			False, CurrentTime );
		XCloseDisplay(disp);

		return 0;
	}
	EOF

And compile it:

	 gcc -I/usr/X11R6/include -L/usr/X11R6/lib -o xsetnumlock \
	 	xsetnumlock.c -lX11 -lXtst

Now you have a binary named xsetnumlock. If required, change its ownership and
permissions:

	chown root:root xsetnumlock
	chmod 0755 xsetnumlock

Move it to either /usr/bin or /usr/X11R6/bin, whatever you consider more
suitable. Then add the following line to the beginning of either the
~/.xinitrc, ~/.Xsession or ~/.Xclients file (assuming you have moved
xsetnumlock to /usr/bin; if not, use the appropriate path):

	/usr/bin/xsetnumlock

3. THE END

Right, that should do it. Enjoy your NumPad.

Comments, improvements whatsoever on this hint will be received with a warm
welcome at the e-mail address specified in the AUTHOR field above.

ACKNOWLEDGEMENTS:
* Manfred H. Winter <mahowi at gmx dot net> for mentioning the C program from
  the SuSE Support Database as well as other important improvements of this
  hint.
* Tushar Teredesai <tush at yahoo dot com> for mentioning NumLockX and the KDE
  fix.
* Seth W. Klein <sk at sethwklein dot net> for mentioning xsetleds.

CHANGELOG:
[2003-12-05]
  * Hint conforms to new format.
  * Minor text changes.


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