From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18766 invoked by alias); 15 Oct 2013 23:15:08 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 18753 invoked by uid 89); 15 Oct 2013 23:15:07 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.2 X-HELO: vms173015pub.verizon.net Received: from vms173015pub.verizon.net (HELO vms173015pub.verizon.net) (206.46.173.15) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 15 Oct 2013 23:15:06 +0000 Received: from [192.168.1.231] ([unknown] [74.104.179.122]) by vms173015.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0MUQ0079XGKV0030@vms173015.mailsrvcs.net> for cygwin@cygwin.com; Tue, 15 Oct 2013 18:15:00 -0500 (CDT) Message-id: <525DCC6F.7000104@cygwin.com> Date: Tue, 15 Oct 2013 23:15:00 -0000 From: "Larry Hall (Cygwin)" Reply-to: cygwin@cygwin.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-version: 1.0 To: cygwin@cygwin.com Subject: Re: siginfo_t missing member si_band References: <525D55B3.3050002@cs.utoronto.ca> <20131015194242.GA2368@ednor.casa.cgf.cx> <525DB015.1010707@cs.utoronto.ca> <20131015223645.GB7490@ednor.casa.cgf.cx> In-reply-to: <20131015223645.GB7490@ednor.casa.cgf.cx> Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit X-SW-Source: 2013-10/txt/msg00216.txt.bz2 On 10/15/2013 6:36 PM, Christopher Faylor wrote: > On Tue, Oct 15, 2013 at 05:13:57PM -0400, Ryan Johnson wrote: >> 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. > > I guess so. In a project that wasn't requestware or wishware it would > be a spur for someone to submit code to Cygwin to implement SIGPOLL and > it's accompanying siginfo_t handling. Unfortunately, Cygwin seems to > be mainly requestware these days. Any chance of getting a Cygwin implementation of a coffee-maker then? ;-) -- Larry _____________________________________________________________________ A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting annoying in email? -- 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