/dev/tictactoe

A Linux driver for a character device which can be used to play Tic-tac-toe.

Usage

Disclaimer: I make no guarantees about the soundness of the driver code. Use with caution (i.e. only in a virtual machine).

Clone this repository, cd to it, then run make.

After building the module, run insmod tictactoe.ko as root to load it.

After loading the module, player X can write grid coordinates (ranging from 1 to 3, format XY) to /dev/tictactoe to make their first move:

# echo 12 > /dev/tictactoe

After player X has made their move, player O can do the same:

# echo 22 > /dev/tictactoe

To inspect the current state of the game, simply read from /dev/tictactoe:

# cat /dev/tictactoe

#####
# X #
# O #
#   #
#####

It's X's turn!

Alternatively, you can watch the file in a separate terminal for automatic updating:

# watch -n 0.5 cat /dev/tictactoe

To start a new game, write reset to /dev/tictactoe:

# echo reset > /dev/tictactoe

Run rmmod tictactoe as root to unload the module.