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

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Message-Id: <E1GufIC-0002Un-00@calista.eckenfels.net>
Date:	Thu, 14 Dec 2006 02:21:48 +0100
From:	Bernd Eckenfels <ecki@...a.inka.de>
To:	linux-kernel@...r.kernel.org
Subject: Re: Processes with hidden PID files in /proc

In article <20061213180801.A16952@...a.lmcg.wisc.edu> you wrote:
> 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?

clone(2) can be used to create a thread in a new thread group. If that
thread forks, the resulting child has the (invisible) thread group as parent
pid.

Gruss
Bernd
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