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Linux CD-ROM Game System

 
  YAMAMORI Takenori <yamamori@kt.rim.or.jp>

§ Setting up a game to start with a single user mode

Here, we set the system so that a game starts without logging in. For that purpose, modify inittab /etc/inittab and change the default run level to 1 as follows:

· modifying /etc/inittab
id:3:initdefault:
   V
id:1:initdefault:

It is necessary attention in addition to above, though you intend to have set /etc/inittab, the default run level of /etc/inittab will be rewritten as 3 or 5 when you use Xconfigurator later.

¶ Making of S99game

In a single user mode, the scripts under the directory /etc/rc.d/rc1.d are executed. So we newly create a shell script named /etc/rc.d/rc1.d/S99game which describes some commands to start the game. Don't forget to turn on the x permission of the S99game.

In addition, rc scripts should check the argument start basically, but the S99game omits it. The list of S99game is the following:

· List of /etc/rc.d/rc1.d/S99game
#!/bin/sh

/etc/rc.d/init.d/xfs start

PATH=/usr/X11R6/bin:/usr/local/bin:"$PATH"; export PATH
HOME=/root; export HOME
cd

mkdir /tmp/gamefd
umount /dev/fd0
until mount -t vfat /dev/fd0 /tmp/gamefd
do
  echo
  echo -n 'Insert game FD and type [ENTER] or q to skip: '
  read a
  if [ X$a != X ]; then
    break
  fi
done

xinit &

With "/etc/rc.d/init.d/xfs start" line of the S99game, a font server is invoked. Note that the X server does not start without a font server because a font setting of an XF86Config file is described to use a font server in case of Vine 2.0. There is another way that we change the XF86Config setting not to use a font server, however, I choose a simple way to invoke xfs.

Next, we set the environment variables PATH and HOME.

Afterwards, it tries to mount a floppy disk and if it failed it tries again with a message.

¶ Making of /root/.xinitrc

The last line of S99game executes xinit, and launches the X. Here, we described a game command in /root/.xinitrc as follows so that the game starts as an X application.

· List of /root/.xinitrc
exec circuslinux --digital

The /root/.xinitrc is just one line because we don't need even a window manager.

After the setting of S99game and .xinitrc, umount the floppy disk and type the following command to reboot.

# /sbin/init 6

Then the following message will appear on the way of booting:

Insert game FD and type [ENTER] or q to skip:

Insert the floppy disk for the save-data and type [Enter] to proceed, otherwise just type q without a floppy disk.

Now the game should start directly without logging in. Right now we have got the appearance in completion of the CD-ROM game system.

¶ A maintenance work mode

By the way, because the S99game script executes xinit with an "&" which is a shell syntax, the S99game script is finished concurrently with launching X. And the processing returns to S00single and it invokes a single user shell. By this mechanism, we can change a virtual screen during games and do some maintenance work with a single user shell.

Switch the virtual screen as follows:

[Ctrl]+[Alt]+[F1] -- A shell on console
[Ctrl]+[Alt]+[F2] -- The game screen

You may need to hit an [Enter] once to see the shell prompt just after switching the screen.

In addition, the number of the virtual screen is two, which is different from a usual multi user mode that has six screens plus an X screen. And note that the PATH and HOME for the single user shell are different from the setting in the S99game.

After the confirmation of the game launching with a single user mode, we can go to a usual multi user mode by typing the following command after finishing the game.

bash# telinit 3

From now on, remember that we finish the game and execute "telinit 3" because the game always starts whenever the system boots from a hard drive.

In addition, when we input exit on the single user shell, the scripts of run level 1 will be executed once more and the game starts again.


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This page has been rewritten for the web from a manuscript of TECH Linux Vol. 2 "CD-ROM Game System" ASCII Corporation.
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© 2000 YAMAMORI Takenori
yamamori@kt.rim.or.jp