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Message-ID: <20110511132218.GG1661@htj.dyndns.org> Date: Wed, 11 May 2011 15:22:18 +0200 From: Tejun Heo <tj@...nel.org> To: Denys Vlasenko <vda.linux@...glemail.com> Cc: Oleg Nesterov <oleg@...hat.com>, jan.kratochvil@...hat.com, linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, indan@....nu Subject: Re: [PATCH 04/11] ptrace: implement PTRACE_INTERRUPT Hey, On Wed, May 11, 2011 at 02:23:44PM +0200, Denys Vlasenko wrote: > I understand this. I am trying to understand what feature are you trying > to provide to userland, or what problematic race scenario you are trying > to make resolve-able *in userland* by making "stop" and "cont" > notifications sticky wrt GETSIGINFO. I just don't see this scenario. If you still don't see how events can get lost, I'm afraid I can't explain any better. You're repeating that exit_code can record the event until it's fetched but it doesn't queue and any trap will overwrite it and debuggers don't have to call GETSIGINFO after each trap - it only has to do so for signal delivery, group stop and INTERRUPT trap. So, it can just look at the exit_code (which doesn't indicate continuation) and let tracee return to userland. Maybe I'm horribly confused. Oleg, am I? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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