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

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Message-ID: <20070731034841.GA16495@fattire.cabal.ca>
Date:	Mon, 30 Jul 2007 23:48:41 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Joseph Pingenot <trelane@...itasaru.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: inotify and /proc/<pid>

On Mon, Jul 30, 2007 at 10:40:59PM -0500, Joseph Pingenot wrote:
> From Al Viro on Tuesday, 31 July, 2007:
> >On Mon, Jul 30, 2007 at 10:31:13PM -0500, Joseph Pingenot wrote:
> >> >From Joseph Pingenot on Monday, 30 July, 2007:
> >> >From Al Viro on Tuesday, 31 July, 2007:
> >> >>On Mon, Jul 30, 2007 at 09:16:16PM -0500, Joseph Pingenot wrote:
> >> >>> I was trying to use inotify to watch process changes (especially process
> >> >>>   termination) by watching /proc/<pid>.
> >> >>> Sadly, although I could see something reading various files, nothing
> >> >>>   was issued when the process I was watching exited and the directory
> >> >>>   went away.
> >> >>> Is this intentional, or a bug?
> >> >>It's a bug you intend to introduce in your program...  IOW, don't
> >> >>do that.
> >> >More background, please?
> >> >What's the way to check for a process exiting without spinning?
> >> I should also specify that the process being waited on is not a
> >>   child process-it's just some other process on the system.
> >Umm...  Any details on intended use?  IOW, is that "I want to write
> >an utility that would wait for given PID to exit, just for the hell
> >of it" or is there something you are trying to implement using that?
> 
> I'm trying to implement pwait.  It blocks until a specified PID exits,
>   and then it exits.
>

ptrace with options set to PTRACE_O_TRACEEXIT?

--Kyle
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