"Welcome to the Advent(2), the Advent calendar of the Operating System Group at the Hamburg University of Technology. Every day of December, we will open a door

"Welcome to the Advent(2), the Advent calendar of the Operating System Group at the Hamburg University of Technology. Every day of December, we will open a door and find a system call, a concept or an interface of Linux. Behind each door, there is a short article and a small exercise, for which the solution is provided the following day."