linux-kernel - Re: [PATCH 07/10] ptrace: make group stop state visible via PTRACE

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Message-ID: <20110519164021.GN627@htj.dyndns.org>
Date:	Thu, 19 May 2011 18:40:21 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	jan.kratochvil@...hat.com, vda.linux@...glemail.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com
Subject: Re: [PATCH 07/10] ptrace: make group stop state visible via
 PTRACE_GETSIGINFO

On Thu, May 19, 2011 at 06:27:41PM +0200, Oleg Nesterov wrote:
> On 05/16, Tejun Heo wrote:
> > @@ -585,6 +587,23 @@ static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info)
> >
> >  	error = 0;
> >  	*info = *child->last_siginfo;
> > +
> > +	/*
> > +	 * If reporting ptrace trap for a seized tracee, enable reporting
> > +	 * of info->si_pt_flags.
> > +	 */
> > +	if ((child->ptrace & PT_SEIZED) &&
> > +	    (info->si_code & __SI_MASK) == __SI_TRAP) {
> > +		/*
> > +		 * Report whether group stop is in effect w/ SI_STOPPED and
> > +		 * if so which signal caused it.
> > +		 */
> > +		if (sig->group_stop_count || sig->flags & SIGNAL_STOP_STOPPED) {
> 
> Cosmetic nit, you could declare "struct signal_struct *sig" here, under
> if (PT_SEIZED && __SI_TRAP).

Yeap, sure.  Will update.

> I must admit, personally I still dislike this new PTRACE_GETSIGINFO API...
> But I can't suggest anything better, so I am not going to argue.

It's not the prettiest, I agree, but it is more or less in line with
the rest of the interface, so...

Thanks.

-- 
tejun
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