Re: [PATCH 7/8] job control: Notify the real parent of job controlevents regardless of ptrace
From: Oleg Nesterov
Date: Tue Mar 22 2011 - 15:53:36 EST
On 03/22, Tejun Heo wrote:
>
> On Mon, Mar 21, 2011 at 06:43:06PM +0100, Oleg Nesterov wrote:
> > Hmm... in fact I can't convince myself we really need to look at
> > child->group_leader, will recheck... Anyway, this is minor too.
>
> Care to elaborate?
child->real_parent must be equal to child->group_leader->real_parent.
What we need is ptrace_reparented(). But as I said, it should be
fixed first (I think) and this needs a separate patch/discussion.
So yes, we need a new helper.
Well, and look at get_signal_to_deliver(),
leader = current->group_leader;
if (task_ptrace(leader) && !real_parent_is_ptracer(leader))
do_notify_parent_cldstop(leader, true, why);
Indeed. But in fact task_ptrace(leader) is not needed. If
real_parent_is_ptracer(tsk) returns false, then tsk must be ptraced.
So we could write
if (!real_parent_is_ptracer(leader))
do_notify_parent_cldstop(leader, true, why);
but now this looks confusing because of the naming. Compare with
if (ptrace_reparented(leader))
do_notify_parent_cldstop(leader);
Oleg.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/