linux-kernel - Re: CLONE_NEWUTS documentation

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Message-ID: <20070806124914.GB23642@sergelap.austin.ibm.com>
Date:	Mon, 6 Aug 2007 07:49:14 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Michael Kerrisk <mtk-manpages@....net>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Kirill Korotaev <dev@...nvz.org>,
	Herbert Poetzl <herbert@...hfloor.at>,
	Andrey Savochkin <saw@...ru>, Adrian Bunk <bunk@...sta.de>,
	Cedric Le Goater <clg@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: CLONE_NEWUTS documentation

Quoting Michael Kerrisk (mtk-manpages@....net):
> 
> 
> Eric W. Biederman wrote:
> > Michael Kerrisk <mtk-manpages@....net> writes:
> > 
> >> Hello Serge,
> >>
> >> In 2.6.19, your patch to add support for CLONE_NEWUTS was included.  Is
> >> there there some for-userland-programmers documentation of this flag
> >> somewhere?  Would you be able to send some documentation to me (ideally as
> >> a patch to the clone.2 man page, but otherwise some plain text will do).
> >>
> >> If this flag is also supported for unshare(), then could you please send me
> >> a patch/text for that too?
> > 
> > Again a short summary
> > 
> > The utsname namespace encapsulates the global kernel identification stored
> > in struct utsname returned from uname(2).
> > 
> > It is a very trivial namespace but it allows you to set multiple hostnames
> > and nis domainnames on the same machine.
> 
> Thanks Eric.
> 
> And a further question: is CLONE_NEWUTS implemented for unshare()?

Yes, it is.  And unlike CLONE_FS but like CONE_NEWNS, it has the same
meaning for unshare as for clone.

thanks,
-serge
-
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