linux-kernel - Re: SIGSTOP && ptrace (Was: ptrace(PTRACE_SYSCALL/CONT/DETACH, ..., SIGSTOP) does not work)

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Message-Id: <200904242315.05422.vda.linux@googlemail.com>
Date:	Fri, 24 Apr 2009 23:15:05 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Jan Kratochvil <jan.kratochvil@...hat.com>
Subject: Re: SIGSTOP && ptrace (Was: ptrace(PTRACE_SYSCALL/CONT/DETACH, ..., SIGSTOP) does not work)

On Friday 24 April 2009 08:23, Roland McGrath wrote:
> > Perhaps, you should ask how strace can distinguish between "SIGSTOP
> > recieved" and "group-stop completed". I am not 100% sure, but at first
> > glance this looks possible.
> 
> It is, but it's easier than the hack you suggest.  PTRACE_GETSIGINFO only
> works for a ptrace stop, not a job control stop.  If wait reported SIGSTOP,
> PTRACE_GETSIGINFO will fail with EINVAL for a job control stop but will
> succeed for a ptrace stop.

I already tested it and it works.
--
vda
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