linux-kernel - Re: + proc-connector-add-event-for-process-becoming-session-leader.patch added to -mm tree

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Message-ID: <20090623202937.GA31252@redhat.com>
Date:	Tue, 23 Jun 2009 22:29:37 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Scott James Remnant <scott@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matt Helsley <matthltc@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: +
	proc-connector-add-event-for-process-becoming-session-leader.patch
	added to -mm tree

> The act of a process becoming a session leader is a useful signal to a
> supervising init daemon such as Upstart.
...
> @@ -360,8 +360,10 @@ void __set_special_pids(struct pid *pid)
>  {
>  	struct task_struct *curr = current->group_leader;
>
> -	if (task_session(curr) != pid)
> +	if (task_session(curr) != pid) {
>  		change_pid(curr, PIDTYPE_SID, pid);
> +		proc_sid_connector(curr);
> +	}

Wouldn't it better to change sys_setsid() then? This looks more clear
imho, and we can move proc_sid_connector() outside of tasklist_lock.

Note also that __set_special_pids() does not neccessary mean we are
becoming a session leader, see daemonize().

Oleg.

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