DragonFly BSD
DragonFly users List (threaded) for 2010-11
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Re: How to test and debug Dragonfly BSD?

From: Alex Hornung <ahornung@xxxxxxxxx>
Date: Tue, 09 Nov 2010 06:12:29 -0300

On 09/11/2010 05:31, <Marcin Ropa> wrote:
There are tons of code. Is there any README, describing which
functionality I may expected in which subdirectory? Where is core of
the system, where main structures are initialized and everything
begins when the system starting.
Just take a look at the directory structure in the source tree, I think it's pretty obvious how things fit together. (Almost) every top level directory in userland has a name that corresponds to its name on the destination installation, e.g. usr.bin is the stuff that goes into /usr/bin. Some notable exceptions are:
contrib -> which is contributed (3rd party) code. The Makefiles are still in the normal directories (i.e. sbin) but the sources for these are here
gnu -> contains the the Makefiles for gnu-licensed programs (the code resides in contrib)
crypto -> contains sources that are of restricted exportability, at least historically.
nrelease -> contains stuff to build ISOs and IMGs
tools -> contains useful stuff like our git template, iirc
test -> contains all sorts of random junk, including test cases, small scripts, files for test commits, ...
and finally:
sys -> Contains the kernel and bootloader code

In sys the most important directories that you should know about are,
kern -> main kernel functionality
sys -> main kernel include files
dev -> contains all sorts of device drivers, nicely categorized in the subfolders
net -> Contains network related stuff (but not hardware drivers)
platform -> platform/architecture dependent code that is not portable
bus -> Contains PCI, ISA and CAM (maybe you know it from FreeBSD, maybe not; it's a neat abstraction layer for SCSI stuff, for example, above the HBAs)

For more help, just ask on the IRC.

Hope this helps,
Alex Hornung

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