linux-kernel - Re: inotify and /proc/<pid>

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Message-ID: <20070731040118.GJ21089@ftp.linux.org.uk>
Date:	Tue, 31 Jul 2007 05:01:18 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: Re: inotify and /proc/<pid>

On Mon, Jul 30, 2007 at 10:56:27PM -0500, Joseph Pingenot wrote:
> >From Al Viro on Tuesday, 31 July, 2007:
> >On Mon, Jul 30, 2007 at 10:40:59PM -0500, Joseph Pingenot wrote:
> >> I'm trying to implement pwait.  It blocks until a specified PID exits,
> >>   and then it exits.
> >er... ptrace(2)?
> 
> Should work for most common usage scenarios, although will suspect that it
>   won't for for processes owned by another user (at least, I hope
>   it wouldn't).
> 
> What is dangerous about inotify on a proc file?

Playing with the lifetime rules, for starters...
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