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Date: Mon, 9 May 2011 12:10:55 +0200
From: Tejun Heo <tj@kernel.org>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: oleg@redhat.com, jan.kratochvil@redhat.com, linux-kernel@vger.kernel.org,
        torvalds@linux-foundation.org, akpm@linux-foundation.org, indan@nul.nu
Subject: Re: [PATCH 11/11] ptrace: implement group stop notification for
 ptracer
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References: <1304869745-1073-1-git-send-email-tj@kernel.org>
 <1304869745-1073-12-git-send-email-tj@kernel.org>
 <201105090042.55599.vda.linux@googlemail.com>
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Hello,

On Mon, May 09, 2011 at 12:42:55AM +0200, Denys Vlasenko wrote:
> To clarify on "sticky":
> 
> Does this mean that if tracer userspace won't query PTRACE_GETSIGINFO,
> but will simply do:
> 
>                   waitid(P_PID, tracee, NULL, WSTOPPED);
>                   ptrace(PTRACE_CONT, tracee, NULL, NULL);
> 
> then kernel will generate INTERRUPT trap again and again
> (without letting tracee run) if job stop state of the tracee has changed?

Correct, it will be in infinite trap loop.

Thanks.

-- 
tejun
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