linux-kernel - Re: [patch 1/4] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry v8

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Message-ID: <20120124091135.GI29735@moon>
Date:	Tue, 24 Jan 2012 13:11:35 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [patch 1/4] fs, proc: Introduce /proc/<pid>/task/<tid>/children
 entry v8

On Tue, Jan 24, 2012 at 12:52:03AM -0800, Eric W. Biederman wrote:
> Cyrill Gorcunov <gorcunov@...il.com> writes:
> 
> > On Tue, Jan 24, 2012 at 04:07:09PM +0900, KAMEZAWA Hiroyuki wrote:
> >> > 
> >> > Hmm. But userspace app will get eof, so frankly I don't see
> >> > a problem here. Or maybe I miss something?
> >> > 
> >> 
> >> Userspace need to take care of whether there may be"\n" or not even
> >> if read() returns EOF.
> >> As an interface, it's BUG to say "\n" will be there if you're lucky!"
> >> (*) I know script language can handle this but we shouldn't assume that.
> >> 
> >> How about just remove "\n" at EOF  ? I think it's unnecessary.
> >> 
> >
> > Sure thing, it's not a problem to remove it completely.
> 
> Foolish question.  Is there any reason why this is a file instead
> of being the obvious directory full of symlinks?
> 

How would these symlinks look like? "../../pid"? There were a conversation
about such things (https://lkml.org/lkml/2011/12/2/142) but I suppose we
were agree on children with pids as consensus.

	Cyrill
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