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:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type:content-transfer-encoding;
	q=dns; s=default; b=T7eI8BXouKuXy+uDWY/pa++6Q3uRSGjTRR9+8d+Rgjp
	OUkJMkryfZa705mKcsCdVsfPPM7hYontkgTdo/pxoO1gsUFzZTPX11fQMSkFRIyc
	oWuN6Fgtwvz40tst7ba7tsD4AjaoFUAty9XdzysFNCIYfYZAqosg2ohHCV2GfD+Y
	=
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:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type:content-transfer-encoding;
	s=default; bh=RHLINQSE/gl3r7HxIIoUnSAQs9w=; b=sCArCfcj5SwM+5RxG
	7YuKwZuF1uTRNCVNjt1ZzeJ3jlxa49RyT54APnusZq2VsysWVP63yW7ns+Ct33Up
	P/mbR9yM8XI+H4B7zAyGtblCHWQjptro2ChJ71W6+nyGd246BSVkppDFnIRUCtDs
	vJlfUD7ANtZr02FF6Fxdy5jJEU=
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=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_LOW,RP_MATCHES_RCVD,SPF_NEUTRAL autolearn=ham version=3.3.2
X-HELO:	bureau85.ns.utoronto.ca
Message-ID:	<525DB015.1010707@cs.utoronto.ca>
Date:	Tue, 15 Oct 2013 17:13:57 -0400
From:	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
User-Agent:	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8
MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: siginfo_t missing member si_band
References:	<525D55B3 DOT 3050002 AT cs DOT utoronto DOT ca> <20131015194242 DOT GA2368 AT ednor DOT casa DOT cgf DOT cx>
In-Reply-To:	<20131015194242.GA2368@ednor.casa.cgf.cx>
X-IsSubscribed:	yes

On 15/10/2013 3:42 PM, Christopher Faylor wrote:
> On Tue, Oct 15, 2013 at 10:48:19AM -0400, Ryan Johnson wrote:
>> Hi all,
>>
>> While trying to build python3 for cygwin, I kept encountering the
>> following error message:
>>
>> ./Modules/signalmodule.c: In function ?fill_siginfo?:
>> ./Modules/signalmodule.c:745:60: error: ?siginfo_t? has no member named
>> ?si_band?
>> PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
>> ^
>> Include/tupleobject.h:62:75: note: in definition of macro
>> ?PyTuple_SET_ITEM?
>> #define PyTuple_SET_ITEM(op, i, v) (((PyTupleObject *)(op))->ob_item[i]
>> = v)
>> ^
>> ./Modules/signalmodule.c:745:5: note: in expansion of macro
>> ?PyStructSequence_SET_ITEM?
>> PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
>>
>> As far as I can tell, siginfo_t::si_band is mandated by POSIX.1-2001,
>> and required for proper handling of SIGPOLL. The latter seems to
>> correspond to async I/O with poll(2). I'm pretty sure cygwin doesn't
>> support async I/O, but shouldn't the struct member at least exist, to
>> avoid breaking code that assumes its existence? The alternative is to
>> patch python3 locally so its os.sigwaitinfo function no longer touches
>> si_band, or to file a bug upstream so that the module's configury tests
>> for its existence before using it.
>>
>> Thoughts?
> Sure.  I question the utility of lying in a structure about the
> availability of an unimplemented feature.  If something is specifically
> expecting the structure member to exist it seems like it would be
> expecting it to do something.
So that would be a vote for filing a bug upstream with python's FFI 
interface to signal handling? Fair enough.

Ryan


--
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 -