linux-kernel - Re: [v11][PATCH 9/9] Document clone_with

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Message-ID: <20091106183936.GA32531@us.ibm.com>
Date:	Fri, 6 Nov 2009 12:39:36 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Sukadev Bhattiprolu <sukadev@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de,
	Containers <containers@...ts.linux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, hpa@...or.com,
	Alexey Dobriyan <adobriyan@...il.com>, roland@...hat.com,
	Pavel Emelyanov <xemul@...nvz.org>,
	Oren Laadan <orenl@...columbia.edu>
Subject: Re: [v11][PATCH 9/9] Document clone_with_pids() syscall

Quoting Sukadev Bhattiprolu (sukadev@...ibm.com):
...
> +	If a pid in the @pids list is non-zero, the kernel tries to assign
> +	the specified pid in that namespace.  If that pid is already in use
> +	by another process, the system call fails (see EBUSY below).
> +
> +	The order of pids in @pids is oldest in pids[0] to youngest pid
> +	namespace in pids[nr_pids-1]. If the number of pids specified in the

In the sys_choosepid() discussion, Matt suggested it would be more
user-friendly to have the pid for the youngest pidns be pids[0].
That way the user doesn't have to know their pidns depth.

-serge
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