linux-kernel - Processes with hidden PID files in /proc

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Message-ID: <20061213180801.A16952@yoda.lmcg.wisc.edu>
Date:	Wed, 13 Dec 2006 18:08:01 -0600
From:	Daniel Forrest <forrest@...g.wisc.edu>
To:	linux-kernel@...r.kernel.org
Subject: Processes with hidden PID files in /proc

Hopefully someone can give me a quick answer...

Yesterday I discovered some processes that had a PPID which was not
shown as a running process by "ps".  Also an "ls /proc" did not show
that PPID.

I've Googled on this enough to find out that these are Linux threads,
that "ps -m" will show them, that "ls -a /proc" will show /proc/.PPID,
etc, but I'm still wondering what exact sequence of system calls will
create a process like this?

I'm trying to file a bug report for another piece of software and I
would like to make a simple test program that shows this situation.

Thanks,

-- 
Daniel K. Forrest	Laboratory for Molecular and
forrest@...g.wisc.edu	Computational Genomics
(608) 262 - 9479	University of Wisconsin, Madison
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