Re: Darwin
Re: Darwin
- Subject: Re: Darwin
- From: Andrew Gallatin <email@hidden>
- Date: Mon, 20 May 2013 16:52:15 -0400
On 05/20/2013 04:37 PM, Rick Macklem wrote:
> Andrew Gallatin wrote:
>> Some corrections:
>>
>> On 05/20/2013 03:23 PM, Michael Crawford wrote:
>>> The Darwin kernel is a massive fork of the FreeBSD kernel. Darwin
>>> has
>>> the Mach microkernel statically linked in - not as a microkernel -
>>> to
>>> enable
>> Although it is a common misconception, the darwin kernel is most
>> certainly not a fork of FreeBSD. It is a direct descendant of the NeXT
>> kernel, which is a shotgun wedding of BSD and Mach (those were popular
>> in the 90s, DEC Tru64 UNIX is another example) and it far pre-dates
>> FreeBSD. The similarities between FreeBSD & MacOSX are mainly due to
>> common BSD heritage, as well as some code ported between the two
>> (kqueue, ipfw). They are more like second or 3rd cousins than
>> siblings.
>>
> Well, if you looked at xnu-592 (or somewhere around there, which is
> the open sourced kernel sources related to OS X 10.3 Panther) you
> will see a lot of FreeBSD code in it and not just 4.nBSD.
> Mac OS X diverged dramatically when Apple did 10.4 Tiger, at least
> in the vfs/vop area that I worked in. I would have called the early
> 10.n (up to n == 3) closer that 2nd cousin, but I'm just nitting picks.
>
Yes, up until the KPIs were enforced, things were much more similar. I
used to actually maintain a driver for some older HPC stuff where the
ethernet driver shared code on MacOSX, FreeBSD and DEC Unix. I had the
core C tx / rx routines shared, and the OS-specific wrappers in C++ for
OSX. After KPIs, that got a lot harder, but that product died around
the same time, so it did not really matter.
The network stack from around panther has more FreeBSD CVS references
in it than I remembered seeing. But I would not even remotely call it a
"fork". They just pulled in fixes & improvements from compatible open
source projects.
Drew
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| | >Re: Darwin (From: Rick Macklem <email@hidden>) |