How Linux Works, 3rd Edition

6 How User Space Starts

The point where the kernel starts init, its first user-space process, is significant—not just because the memory and CPU are finally ready for normal system operation, but because that’s where you can see how the rest of the system builds up as a whole. Prior to this point, the kernel follows a well-controlled path of execution defined by a relatively small number of software developers. User space is far more modular and customizable, and it’s also quite easy to see what goes into the user-space startup and operation. If you’re feeling a little adventurous, you can use this to an advantage, because understanding ...