X-Recipient:	archive-cygwin AT delorie DOT com
DomainKey-Signature:	a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:message-id:date:mime-version
	:content-type:content-transfer-encoding; q=dns; s=default; b=HXS
	R4LfPUA3c9ViC5g/LlOGaodf0r9kzmMSoUamHwid3zJo8PEA+byBSf7f7Gk5mbSy
	1vyveGLaEfeF78SJbQDhyanC6EN+YtCr+g0zcIUubP2JbIyfHFy695bVir8XvTFG
	z4jcydpW3MqEMbXx+DnMPZhrH+RiEqoaVVhMPMdU=
DKIM-Signature:	v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:to:from:subject:message-id:date:mime-version
	:content-type:content-transfer-encoding; s=default; bh=acaQ/KR+P
	hlWIaHOiFRPSmSzeVw=; b=CNGRP5wnQO1B7S4qbAlvsqsC75JmKKcXeZvhkNJhH
	1l9XAULkRbxvxl8/74QCJbs+OrD+Tgf54tDTaOm8J3h7Ks7alrhr2CehmDkIl0Is
	ZN36cHg/1NLq6wedBJNiZmTp11xsR2Q4gz6SZ9x/1voQDfK3JzBXzrqrK6HLVSdN
	uU=
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
Authentication-Results:	sourceware.org; auth=none
X-Virus-Found:	No
X-Spam-SWARE-Status:	No, score=-2.7 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_LOW,RP_MATCHES_RCVD,SPF_PASS autolearn=ham version=3.3.2 spammy=acts, H*Ad:D*pobox.com, race, H*MI:pobox
X-HELO:	sasl.smtp.pobox.com
To:	cygwin AT cygwin DOT com
From:	Daniel Santos <daniel DOT santos AT pobox DOT com>
Subject:	How to trap crash or exit in Windows?
Message-ID:	<5a3891fb-1307-5eb8-210b-d07f37b17323@pobox.com>
Date:	Fri, 14 Apr 2017 17:44:56 -0500
User-Agent:	Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
MIME-Version:	1.0
X-Pobox-Relay-ID:	580E6332-2163-11E7-9676-E680B56B9B0B-06139138!pb-smtp1.pobox.com
X-IsSubscribed:	yes

I'm hacking expect to try to solve its "broken pipe" problem, but I 
haven't done any serious windows programming/debugging in over 10 
years.  I want to be able to set some type of "trap" after a fork (on 
the child) and then disable it before it calls execvp to catch any 
crashes or normal program exit in between those two points, how can I do 
this on Windows / Cygwin?  Does sigaction work in Cygwin with SIGILL, 
SIGSEGV, et. al.?  I haven't had an atexit function get called yet, so 
I'm hoping that means that I'm never getting a normal exit prior to 
calling exec (I should verify that).  Also, is there a way I can use 
strace with Cygwin to narrow what spams?  This acts like a race 
condition and sometimes I have to run for 5 or 10 minutes before it 
fails, so emitting more spam will likely lower the likelihood of failure.

One very interesting aspect of this is that if I run two separate make 
-kj1 check jobs (gcc's testsuite) then I can still get the failure, but 
never when just running a single make -kj1 job.  Thus, one suspect is 
DLL base address, even though I have rebased the build tree.  Is there a 
nifty way of catching or debugging fork/DLL base address conflicts?  
iiuc, the whole rebasing thing is so that every DLL has a unique 
(non-overlapping) base address so that when we fork, the DLLs are always 
loaded at the same address.

Using debug log spew, I traced the child "going away" to after calling 
an ioctl to set the terminal window size.

Thanks in advance!
Daniel



--
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

- Raw text -