Re: For review: pid_namespaces(7) man page

Michael Kerrisk (man-pages)
2013-03-01T08:03:40Z

[CC += Lennart]

On Thu, Feb 28, 2013 at 3:24 PM, Vasily Kulikov <segoon@openwall.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/