From owner-freebsd-emulation@FreeBSD.ORG  Fri Dec 15 17:37:18 2006
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Date: Fri, 15 Dec 2006 18:36:45 +0100
From: Divacky Roman <xdivac02@stud.fit.vutbr.cz>
To: Alexander Leidinger <Alexander@Leidinger.net>
Message-ID: <20061215173644.GA87389@stud.fit.vutbr.cz>
References: <20061215040136.GA2466@triptrop.wlan.in.nicta.com.au>
	<20061215111523.bh59htm680ok4gk8@webmail.leidinger.net>
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Cc: freebsd-emulation@freebsd.org, Timothy Bourke <timbob@bigpond.com>
Subject: Re: X11 through nullfs under chroot
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On Fri, Dec 15, 2006 at 11:15:23AM +0100, Alexander Leidinger wrote:
> Quoting Timothy Bourke <timbob@bigpond.com> (from Fri, 15 Dec 2006  
> 15:01:36 +1100):
> 
> >I would like to run chroot-ed gentoo-stage3 X client applications on my
> >host X server through a Unix domain socket.
> >
> >It does work:
> >  * through a tcp socket
> >  * using a hardlink to /tmp/.X11-unix/X0
> >
> >But it does not work via:
> >  mount -t nullfs /tmp /compat/linux/tmp
> 
> This smells like a problem in nullfs regarding sockets (and maybe  
> other special files). I suggest to tell about this on the filesystem  
> mailinglist. Don't forget to tell them hich version of FreeBSD you are  
> using.

there's a comment in compat/linux/linux_getcwd.c

/*
 * XXX Untested vs. mount -o union; probably does the wrong thing.
 */

I guess it applies to nullfs too