linux-kernel - Re: For review: pid_namespaces(7) man page

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Message-ID: <CAKgNAkjXAfq4RwtX1ELier+GLv0D5e9spM3Os3-oqSCXGqRqOg@mail.gmail.com>
Date:	Fri, 1 Mar 2013 09:03:18 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Vasily Kulikov <segoon@...nwall.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-man <linux-man@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Lennart Poettering <lennart@...ttering.net>
Subject: Re: For review: pid_namespaces(7) man page

[CC += Lennart]

On Thu, Feb 28, 2013 at 3:24 PM, Vasily Kulikov <segoon@...nwall.com> wrote:
> Hi Michael,
>
> On Thu, Feb 28, 2013 at 12:24 +0100, Michael Kerrisk (man-pages) wrote:
>>    The namespace init process
>>        The first process created in a new namespace (i.e., the process
>>        created using clone(2) with the CLONE_NEWPID flag, or the first
>>        child created by a process after a call to unshare(2) using the
>>        CLONE_NEWPID flag) has the PID 1, and is the "init" process for
>>        the namespace (see init(1)).  Children that are orphaned within
>>        the namespace will be reparented to this  process  rather  than
>>        init(1).
>
> Probably it worth noting here that this is true unless
> prctl() with PR_SET_CHILD_SUBREAPER option is called.

Thanks Vasily. It probably is worth mentioning that, and I will add some words.

One thing I am not sure of (have not tested), but maybe you (or Eric)
know the answer: does the effect of PR_SET_CHILD_SUBREAPER  cross a
PID namespace boundary? In other words, if it was a process in the
parent PID namespace that employed PR_SET_CHILD_SUBREAPER , will that
affect child processes in a child PID namespace, or  wiill
PR_SET_CHILD_SUBREAPER  only apply to child processes in the same PID
namespace as the caller?

Thanks,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/
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