A simple service that tells the Linux kernel not to handle KEY_RFKILL input events, ie. not to toggle the rfkill status when that key (usually marked as "Airplane mode" or "No Wifi") gets pressed.
As long as nothing else in userspace (eg. graphical desktop environments) is toggling rfkill in reaction to KEY_RFKILL being pressed, then this service will prevent that key from toggling the rfkill state.
This is great if you rarely use the "Airplane mode" feature, but find it annoying to lose your Wifi connection if you accidentally press that key. Plus, it frees up the key for rebinding to some other purpose.
You need a working C compiler. To compile the rfkill-input-handler-disable program, run:
make
You can run the rfkill-input-handler-disable program as any user with access to /dev/rfkill. When the program starts up, you should see rfkill: input handler disabled appear in dmesg. The process then does nothing, but while it's present, the kernel won't handle KEY_RFKILL. When the process ends, you'll see rfkill: input handler enabled in dmesg, and the kernel will resume handling KEY_RFKILL.
A systemd service definition file is also included. To install it and the binary, run:
sudo make install
sudo systemctl daemon-reload
sudo systemctl enable rfkill-input-handler-disable.service
sudo systemctl start rfkill-input-handler-disable.service