Date: Wed, 4 Apr 2007 15:39:03 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Mac OS underlying FreeBSD - does it run Linux emulation? Message-ID: <20070404153559.Y18288@fledge.watson.org> In-Reply-To: <17939.44784.420806.421633@bhuda.mired.org> References: <20070404130249.GA41671@kukulies.org> <17939.44784.420806.421633@bhuda.mired.org>
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On Wed, 4 Apr 2007, Mike Meyer wrote: > In <20070404130249.GA41671@kukulies.org>, Christoph P. Kukulies <kuku@kukulies.org> typed: >> does anyone know whether one can run Linux applications under the underlying >> FreeBSD of the MAC OS (on an Intel Core Duo mini Mac)? > > No, you can't. The "underlying" FreeBSD is userland code; not kernel code. > The OSX kernel is based on Mach. While it's true you can't run Linux binaries on Mac OS X, it's not for the reason you're suggesting, and your statement regarding FreeBSD kernel code in Mac OS X is simply incorrect. The Mac OS X kernel, XNU, contains significant quantities of FreeBSD kernel source code, including a FreeBSD-derived VFS and network stack. Other parts of the kernel, such as the scheduler and VM system, are derived from Mach. While the FreeBSD-derived code has been significantly modified since it was originally forked, a lot of code moves backward and forward between the platforms: the FreeBSD audit subsystem is derived from the Mac OS X audit subsystem, and Mac OS X's smbfs and MAC Framework support are derived from FreeBSD. Robert N M Watson Computer Laboratory University of Cambridge
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