linux-kernel - Re: [PATCH 0/2] net: Implement SO_PEERCGROUP and SO

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Message-ID: <20140423190532.GE22755@redhat.com>
Date:	Wed, 23 Apr 2014 15:05:32 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	David Miller <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	cgroups@...r.kernel.org,
	Network Development <netdev@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Simo Sorce <ssorce@...hat.com>,
	lpoetter@...hat.com, kay@...hat.com,
	Daniel Walsh <dwalsh@...hat.com>
Subject: Re: [PATCH 0/2] net: Implement SO_PEERCGROUP and SO_PASSCGROUP
 socket options

On Tue, Apr 22, 2014 at 01:31:13PM -0700, Andy Lutomirski wrote:
[..]
> > Otherwise, without SO_PASSCGROUP, there is no way for datagram sockets
> > to find out the peer's open() time cgroup.
> 
> Right.
> 
> I'd still like to know what userspace applications want this feature.
> The canonical example seems to be journald, but journald doesn't use
> unix datagram sockets AFAICS,

Dan Walsh mentiond that systemd also monitors /dev/log (datagram socket) and
logs everything in journal. There this information should be useful.

Thanks
Vivek
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