On Monday, January 28, 2002, at 09:46 PM, Sujal Shah wrote: Hi, I'm taking a look at porting the coda client filesystem driver from FreeBSD to Darwin. There are two fundamental problems I'm running into, one sort of frivolous, the other more fundamental. I'll start with the frivolous one first. I've been trying to figure out the "proper" way to set up a ProjectBuilder project for a filesystem driver. There are several targets necessary, and scattered source. There is also very little consistency in the file system sources included with the Darwin source code. Can someone point out one of the filesystems in the darwin source as a "recommended way" to do it? You can find PB projects dealing with file systems in the Darwin repository. That should help. If not, you want to start with the "KEXT" type in PB. Now the more fundamental question: I'm just trying to understand the way that a filesystem might be implemented in darwin. In other words, what are the specific targets that are required to get it to work. Also, why are there different targets for kmods and kexts? I thought they were the same thing... KEXTs and kmods are not the same; the latter is a building block on which the former is built. Typically, file system and network extensions are kmods, but that is not cast in concrete. A KEXT is a collection of one or more kmods, plus some other goo. The darwin repository is replete with examples that should help by giving you working examples. Check the HOWTOs on the Apple Darwin site for details. So, my real question is, what are some good pointers on doing something like this. I have read most of the included documentation regarding writing KEXTs, but haven't found anything that goes into any detail at all. I realize that most of the targets in the existing projects are pretty self explanatory, but it would be nice to understand the reasoning behind some of the layout and organization. Except for IO Kit support, the documentation is sparse. Look to the repository for examples (e.g., see the folders Networking and Filesystems in http://www.opensource.apple.com/cgi-bin/registered/cvs). Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | It's not whether you win or lose... | It's whether *I* win or lose. *--------------------------------------*-------------------------------*