From owner-freebsd-current@FreeBSD.ORG  Wed Apr  4 21:30:02 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: current@freebsd.org
Delivered-To: freebsd-current@FreeBSD.ORG
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 0751C16A402
	for <current@freebsd.org>; Wed,  4 Apr 2007 21:30:02 +0000 (UTC)
	(envelope-from ed.maste@gmail.com)
Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.172])
	by mx1.freebsd.org (Postfix) with ESMTP id B569113C448
	for <current@freebsd.org>; Wed,  4 Apr 2007 21:30:00 +0000 (UTC)
	(envelope-from ed.maste@gmail.com)
Received: by ug-out-1314.google.com with SMTP id 71so842214ugh
	for <current@freebsd.org>; Wed, 04 Apr 2007 14:29:58 -0700 (PDT)
DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta;
	h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=EE+zZyWJPpsP88ZiwxM/zc1P8BRKpQf5/YmddTKHv3lFIDe1COld+xDB/kaGbtLYGWenv8BT7LNW54/qvNRcGv7IEZbprRAYK2i1pa5yALUBcSFYrCffPbD9wI7XQEt1g7gGn+5EgJIxibglo5sU3+TvBFtNZ5s0CiUxq1GA7w4=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta;
	h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=JrgYcyoNvgIpR/J3cVBmAV4U0bdgYVHMkxXU8N2irFD0LMxdI16Xb2giIza6CnlOIVbPFxgK4WYhqak0evqNzmbVutmhHmEw/cgD1N8xtfb5H+ZXmHnRI/5HGH/nMEMn+wuR7vvnqAS2wZ467U7q4zJ8O1J29T3IgSnrsIZXJP4=
Received: by 10.78.124.13 with SMTP id w13mr206831huc.1175720781931;
	Wed, 04 Apr 2007 14:06:21 -0700 (PDT)
Received: by 10.78.188.7 with HTTP; Wed, 4 Apr 2007 14:06:21 -0700 (PDT)
Message-ID: <88607eb20704041406ka4902fdqe0f2897a2f9f15d9@mail.gmail.com>
Date: Wed, 4 Apr 2007 17:06:21 -0400
From: "Ed Maste" <ed.maste@gmail.com>
To: "Ed Maste" <emaste@phaedrus.sandvine.ca>, "Ed Schouten" <ed@fxq.nl>, 
	"Howard Su" <howard0su@gmail.com>, current@freebsd.org
In-Reply-To: <20070404203221.GA88767@sandvine.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <f126fae00704040118w25a7b291xdcf1b6300bab1ceb@mail.gmail.com>
	<20070404121602.GI14608@hoeg.nl> <20070404203221.GA88767@sandvine.com>
X-Mailman-Approved-At: Thu, 05 Apr 2007 01:28:31 +0000
Cc: 
Subject: Re: [Review] Remove procfs dependency of truss
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 04 Apr 2007 21:30:02 -0000

On Wed, Apr 04, 2007 at 02:16:02PM +0200, Ed Schouten wrote:

> Indeed. Looking at sys/ptrace.h, there are a lot of instructions that
> aren't documented in the manpage:
>
> - PT_GETNUMLWPS
> - PT_GETLWPLIST
[...]

Yeah, it's unfortunate that these aren't documented and ptrace seems to
be somewhat mysterious.

I ran across this while starting to work on switching gcore from procfs
to ptrace, in the context of getting it to understand threads.  (Procfs
provides /proc/pid/regs, which returns only the register set for the
first thread in the process.  There are other XXXKSE gotchas in the
procfs source too.)

Ed Maste