linux-kernel - Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE

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Message-ID: <AANLkTi=KfK9AUnUfS1BUVCifpohoJZWXLpTnznRcshw5@mail.gmail.com>
Date:	Mon, 14 Feb 2011 19:59:19 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>, Roland McGrath <roland@...hat.com>,
	jan.kratochvil@...hat.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE_ATTACH

On Mon, Feb 14, 2011 at 6:39 PM, Oleg Nesterov <oleg@...hat.com> wrote:
>> Ah, I see. Is there any way debugger can distinguish between these two
>> different stops?
>
> IIRC, the (only?) way to distinguish is to check last_siginfo != NULL
> via ptrace(PTRACE_GETSIGINFO).

Right. ptrace(PTRACE_GETSIGINFO) will fail on non-signal-delivery stops.
Thus, it can be used to distinguish different kinds of SIGSTOPs in my example.
-- 
vda
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