linux-kernel - Re: [patch] add file position info to proc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <17927.3630.414133.365527@notabene.brown>
Date:	Mon, 26 Mar 2007 10:05:02 +1000
From:	Neil Brown <neilb@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, linux-kernel@...r.kernel.org
Subject: Re: [patch] add file position info to proc

On Sunday March 25, akpm@...ux-foundation.org wrote:
> On Sat, 24 Mar 2007 23:04:09 +0100 Miklos Szeredi <miklos@...redi.hu> wrote:
> 
> > This patch adds support for finding out the current file position,
> > open flags and possibly other info in the future.
> > 
> > These new entries are added:
> > 
> >   /proc/PID/fdinfo/FD
> >   /proc/PID/task/TID/fdinfo/FD
> > 
> > For each fd the information is provided in the following format:
> > 
> > pos:	1234
> > flags:	0100002
> 
> I've seen the idea mentioned once or twice, but not with any great
> enthusiasm.  Why does Linux want this feature?

Same reason we want ltrace and lsof.  To be able to look inside a
process and see what it is doing.
e.g. how far has that program got through reading that enormous file?
is it really making progress, or is it going much more slowly than I
would expect and so should I look more deeply.

I'm in favour.

NeilBrown
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/