X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-0.6 required=5.0	tests=AWL,BAYES_50,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,TW_CG,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By: sourceware.org
Message-ID: <4E68F861.5090309@gmail.com>
Date: Thu, 08 Sep 2011 19:16:17 +0200
From: Marco atzeri <marco DOT atzeri AT gmail DOT com>
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.1) Gecko/20110830 Thunderbird/6.0.1
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: debugging SIGSEV on pclose
References: <4E64BE96 DOT 5020107 AT gmail DOT com> <4E68CE13 DOT 6010106 AT gmail DOT com> <20110908142702 DOT GA28918 AT ednor DOT casa DOT cgf DOT cx> <4E68DB48 DOT 3050906 AT gmail DOT com> <4E68EB4A DOT 5040406 AT gmail DOT com> <20110908165203 DOT GB28918 AT ednor DOT casa DOT cgf DOT cx>
In-Reply-To: <20110908165203.GB28918@ednor.casa.cgf.cx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On 9/8/2011 6:52 PM, Christopher Faylor wrote:

>
> As I said, on Linux, if you call pclose twice in succession you get
> a SEGV.  I am comfortable with Cygwin's behavior especially since you
> seem to be seeing an actual program problem.

unlikely a octave issue as it SEGFAULT's only on cygwin,
and all the other platforms are fine: Linux, BSD, Apple.

I suspect more a borderline cygwin issue that octave
is just hitting. But of course I could be wrong.

>>
>> $ grep 'pipe:\[5\]'  octave.strace
>>     24     595 [main] sh 2840 fhandler_base::fixup_after_exec: here for
>> '/dev/fd/pipe:[5]'
>>     35 103396815 [main] octave-3.4.2 3664 fhandler_base::close: closing
>> '/dev/fd/pipe:[5]' handle 0x46C
>>     37     896 [main] gs 2840 fhandler_base::fixup_after_exec: here for
>> '/dev/fd/pipe:[5]'
>>     48   93072 [main] sh 2840! fhandler_base::close: closing
>> '/dev/fd/pipe:[5]' handle 0x46C
>>     31 2358333 [main] gs 2840 fhandler_base::close: closing
>> '/dev/fd/pipe:[5]' handle 0x46C
>>
>> but I guess they are the two sides of the pipe
>
> Well, one of them is in an execed process.  Some of the others are in
> different processes.
>
> cgf

I will further look

Marco



--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple