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Linux Kernel Module Programming Guide



Ori Pomerantz || English || PDF || 296 Pages || 1.18 MB

Introduction
So, you want to write a kernel module. You know C, you’ve written a number of normal programs to run as processes, and now you want to get to where the real action is, to where a single wild pointer can wipe out your file system and a core dump means a reboot. Well, welcome to the club. I once had a wild pointer wipe an important directory under DOS (thankfully, now it stands for the Dead Operating System), and I don’t see why living under Linux should be any safer. Warning: I wrote this and checked the program under versions 2.0.35 and 2.2.3 of the kernel running on a Pentium. For the most part, it should work on other CPUs and on other versions of the kernel, as long as they are 2.0.x or 2.2.x, but I can’t promise anything. One exception is chapter 11, which should not work on any architecture except for x86.

Who Should Read This
This document is for people who want to write kernel modules. Although I will touch on how things are done in the kernel in several places, that is not my purpose. There are enough good sources which do a better job than I could have done. This document is also for people who know how to write kernel modules, but have not yet adapted to version 2.2 of the kernel. If you are such a person, I suggest you look at appendix A to see all the differences I encountered while updating the examples. The list isnowhere near comprehensive, but I think it covers most of the basic functionality and will be enough to get you started.

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