daemon that buzzes when you switch the keyboard layout :)

[ivan777]

I'm new to C ++, but I want to write a daemon that runs mp3 file and buzzing when I switch the language.
What should I read?
In order to do it.
for Fedora

[Konstantin2]

xxkb changes icon when you change language in xorg.
Get it's source and modify. Let it not change icon but play mp3.