From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: lekktu@gmail.com, emacs-devel@gnu.org,
Roland.Winkler@physik.uni-erlangen.de
Subject: Re: proced: ppid of process ID 0 can be 0
Date: Tue, 30 Dec 2008 12:11:15 -0500 [thread overview]
Message-ID: <jwvtz8lvbck.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <uy6y5b7l3.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 24 Dec 2008 23:12:56 +0200")
>> >> > 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.
The ppid is in the /proc/NNN/stat file, those attributes are
distinguished by their order, so if it's missing the ordering gets
messed up, so it can't be missing. As for the /proc/NNN/stat file
missing, that would mean that pretty much all the attributes returned by
`ps' would be missing, so we can definitely count on its presence.
Stefan
next prev parent reply other threads:[~2008-12-30 17:11 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-20 2:52 proced: ppid of process ID 0 can be 0 Juanma Barranquero
2008-12-20 3:27 ` Stefan Monnier
2008-12-20 4:31 ` Chong Yidong
2008-12-20 19:10 ` Stefan Monnier
2008-12-20 10:20 ` Juanma Barranquero
2008-12-20 11:34 ` Eli Zaretskii
2008-12-20 19:41 ` Roland Winkler
2008-12-20 21:02 ` Juanma Barranquero
2008-12-20 22:02 ` Eli Zaretskii
2008-12-20 22:41 ` Roland Winkler
2008-12-21 4:15 ` Eli Zaretskii
2008-12-21 4:48 ` Roland Winkler
2008-12-21 19:17 ` Eli Zaretskii
2008-12-21 21:26 ` Juanma Barranquero
2008-12-22 4:09 ` Eli Zaretskii
2008-12-22 10:41 ` Juanma Barranquero
2008-12-22 19:17 ` Eli Zaretskii
2008-12-22 19:26 ` Juanma Barranquero
2008-12-22 2:45 ` Stefan Monnier
2008-12-22 4:08 ` Eli Zaretskii
2008-12-22 4:17 ` Miles Bader
2008-12-22 19:10 ` Eli Zaretskii
2008-12-22 8:54 ` Harald Hanche-Olsen
2008-12-22 10:43 ` Juanma Barranquero
2008-12-22 10:50 ` Harald Hanche-Olsen
2008-12-22 18:03 ` Giorgos Keramidas
2008-12-22 10:59 ` Andreas Schwab
2008-12-22 19:22 ` Eli Zaretskii
2008-12-22 19:37 ` David De La Harpe Golden
2008-12-22 19:59 ` Andreas Schwab
2008-12-22 12:23 ` Stefan Monnier
2008-12-22 19:57 ` Eli Zaretskii
2008-12-22 22:24 ` Stefan Monnier
2008-12-23 4:02 ` Eli Zaretskii
2008-12-23 12:28 ` Roland Winkler
2008-12-23 14:44 ` Stefan Monnier
2008-12-23 19:12 ` Eli Zaretskii
2008-12-23 20:41 ` Stefan Monnier
2008-12-23 22:34 ` Giorgos Keramidas
2008-12-24 2:34 ` Stefan Monnier
2008-12-24 4:14 ` Eli Zaretskii
2008-12-24 16:47 ` Stefan Monnier
2008-12-24 4:15 ` Eli Zaretskii
2008-12-24 16:47 ` Stefan Monnier
2008-12-24 18:29 ` Eli Zaretskii
2008-12-24 18:55 ` Stefan Monnier
2008-12-24 21:12 ` Eli Zaretskii
2008-12-30 17:11 ` Stefan Monnier [this message]
2008-12-30 22:02 ` Eli Zaretskii
2008-12-31 1:40 ` Stefan Monnier
2008-12-22 8:28 ` Ulrich Mueller
2008-12-21 2:18 ` Stefan Monnier
-- strict thread matches above, loose matches on Subject: below --
2008-12-24 7:42 grischka
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