- Is it possible to create GUI firewall that works as Windows and Mac counterparts? Per program basis. Popup notification window when specific program want to send\recv data from network.
- If no, than why? What Linux kernel lacks to allow existence of such programs?
- If yes, than why there aren’t such program?
P.S. This is programming question, not user one.
To answer your 3rd point.
There is such a program which provides zenity popups, it is called Leopard Flower:
http://sourceforge.net/projects/leopardflower