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From: Roland McGrath <roland@redhat.com>
To: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>, Project Archer <archer@sourceware.org>
Subject: Re: ptrace improvement: PTRACE_O_INHERIT
In-Reply-To: Jan Kratochvil's message of  Tuesday, 15 February 2011 22:43:33 +0100 <20110215214333.GA18086@host1.dyn.jankratochvil.net>
References: <20110203223905.D0C77180081@magilla.sf.frob.com>
	<20110210195212.GA3868@redhat.com>
	<20110211192423.78FFC1802A2@magilla.sf.frob.com>
	<20110211203755.GA5367@redhat.com>
	<20110212005855.E764C1814A4@magilla.sf.frob.com>
	<20110212190253.GA31866@redhat.com>
	<20110214193052.3EC8D1814BA@magilla.sf.frob.com>
	<20110214193812.GA20765@redhat.com>
	<20110215003551.BC1EA1802A2@magilla.sf.frob.com>
	<20110215130805.GA30742@redhat.com>
	<20110215214333.GA18086@host1.dyn.jankratochvil.net>
Message-Id: <20110215215634.2665A1806E0@magilla.sf.frob.com>
Date: Tue, 15 Feb 2011 21:56:00 -0000
X-SW-Source: 2011-q1/txt/msg00055.txt.bz2

> GDB also never trusts the found threads list, it does tkill (TID, 0) to verify
> if any TID is still alive.

Btw, it should use tgkill to avoid false-positive corner cases of PID reuse.