From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: proced: ppid of process ID 0 can be 0 Date: Wed, 24 Dec 2008 23:12:56 +0200 Message-ID: References: <18765.19040.568030.246241@tfkp04.physik.uni-erlangen.de> <18765.29820.997276.703222@tfkp04.physik.uni-erlangen.de> <18765.51840.943986.608296@tfkp04.physik.uni-erlangen.de> Reply-To: Eli Zaretskii NNTP-Posting-Host: lo.gmane.org X-Trace: ger.gmane.org 1230153196 27838 80.91.229.12 (24 Dec 2008 21:13:16 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 24 Dec 2008 21:13:16 +0000 (UTC) Cc: lekktu@gmail.com, emacs-devel@gnu.org, Roland.Winkler@physik.uni-erlangen.de To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Dec 24 22:14:21 2008 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1LFb3c-0008Lv-Kf for ged-emacs-devel@m.gmane.org; Wed, 24 Dec 2008 22:14:20 +0100 Original-Received: from localhost ([127.0.0.1]:41679 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LFb2P-0007mc-F8 for ged-emacs-devel@m.gmane.org; Wed, 24 Dec 2008 16:13:05 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LFb2K-0007jn-Gj for emacs-devel@gnu.org; Wed, 24 Dec 2008 16:13:00 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LFb2J-0007iV-61 for emacs-devel@gnu.org; Wed, 24 Dec 2008 16:13:00 -0500 Original-Received: from [199.232.76.173] (port=45254 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LFb2I-0007i8-SP for emacs-devel@gnu.org; Wed, 24 Dec 2008 16:12:58 -0500 Original-Received: from mtaout1.012.net.il ([84.95.2.1]:32062) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1LFb2I-0007yT-H5 for emacs-devel@gnu.org; Wed, 24 Dec 2008 16:12:58 -0500 Original-Received: from conversion-daemon.i-mtaout1.012.net.il by i-mtaout1.012.net.il (HyperSendmail v2007.08) id <0KCE00700GD90B00@i-mtaout1.012.net.il> for emacs-devel@gnu.org; Wed, 24 Dec 2008 23:15:29 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([77.126.252.83]) by i-mtaout1.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0KCE005JEGDSKI40@i-mtaout1.012.net.il>; Wed, 24 Dec 2008 23:15:29 +0200 (IST) In-reply-to: X-012-Sender: halo1@inter.net.il X-detected-operating-system: by monty-python.gnu.org: Solaris 9.1 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:107281 Archived-At: > From: Stefan Monnier > Cc: Roland.Winkler@physik.uni-erlangen.de, lekktu@gmail.com, emacs-devel@gnu.org > Date: Wed, 24 Dec 2008 13:55:51 -0500 > > >> > Processes that disappeared while Emacs was reading /proc, for example. > >> Then don't return them at all > > How? I don't know enough about Linux kernel internals to decide which > > attribute's absence means that the process died while Emacs was > > reading /proc. > > AFAIK we're talking about ppid, and this info is always present, so if > it's absent, don't return the process. Can you find any authoritative reference that says we can rely on this? I couldn't even find a decent documentation of /proc when I was working on these primitives, let alone some information about what attributes are always present or how that changes with the kernel version.