X-Recipient: archive-cygwin AT delorie DOT com
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D124B3858439
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1636500671;
	bh=iEXyQBZhEx2xBpcqbDnH4PniApzqGKFtftCd6EBPuTU=;
	h=Date:To:Subject:In-Reply-To:References:List-Id:List-Unsubscribe:
	 List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:
	 From;
	b=kl4VpDpVPSUC8+qDDrs0zJ8va4eQPW1LJxncSfjt2Gw9jkTS0+WyTumgyh3W+tlHU
	 mcB5t0Ba+c2e9rfuD6eZsd/rV5Qov4KQXjmPxI48l6Yttr9vlb2eNM0dY39kUMlmei
	 CewvmEzGJyH+Dke9MUYz+SP94Yn23oN++jL2sG8M=
X-Original-To: cygwin AT cygwin DOT com
Delivered-To: cygwin AT cygwin DOT com
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org F15CF3858404
DKIM-Filter: OpenDKIM Filter v2.10.3 conssluserg-03.nifty.com 1A9NTPgQ006126
X-Nifty-SrcIP: [110.4.221.123]
Date: Wed, 10 Nov 2021 08:29:32 +0900
To: cygwin AT cygwin DOT com
Subject: Re: Another pipe-related problem?
Message-Id: <20211110082932.3e33bae9364db0dda0c57d16@nifty.ne.jp>
In-Reply-To: <20211110082245.2943cf3c2519bff24a6843b2@nifty.ne.jp>
References: <f5br1bqaj11 DOT fsf AT ecclerig DOT inf DOT ed DOT ac DOT uk>
 <05c4180e-396b-4af3-ac0c-2ab8125df17e AT cornell DOT edu>
 <f5bk0hh8uox DOT fsf AT ecclerig DOT inf DOT ed DOT ac DOT uk>
 <eb8d7d4f-d1ed-6f30-2ac3-1b24166243d9 AT cornell DOT edu>
 <20211110082245 DOT 2943cf3c2519bff24a6843b2 AT nifty DOT ne DOT jp>
X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32)
Mime-Version: 1.0
X-Spam-Status: No, score=-5.9 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_NONE,
 RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS,
 TXREP autolearn=ham autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: cygwin AT cygwin DOT com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe: <https://cygwin.com/mailman/options/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive: <https://cygwin.com/pipermail/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe: <https://cygwin.com/mailman/listinfo/cygwin>,
 <mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Wed, 10 Nov 2021 08:22:45 +0900
Takashi Yano wrote:
> On Tue, 9 Nov 2021 09:11:28 -0500
> Ken Brown wrote:
> > I'll have to reproduce the hang myself in order to test this (or maybe you could 
> > test it), but I now have a new guess: If the read call above keeps failing with 
> > EINTR, then we're in an infinite loop.  This could happen because of the 
> > following code in fhandler_pipe::raw_read:
> > 
> >    DWORD waitret = cygwait (read_mtx, timeout);
> >    switch (waitret)
> >      {
> >      case WAIT_OBJECT_0:
> >        break;
> >      case WAIT_TIMEOUT:
> >        set_errno (EAGAIN);
> >        len = (size_t) -1;
> >        return;
> >      default:
> >        set_errno (EINTR);
> >        len = (size_t) -1;
> >        return;
> >      }
> > 
> > Takashi, is EINTR really the appropriate errno in the default case?  Isn't 
> > cygwait supposed to handle signals?
> 
> I assume cygwait() returns WAIT_SIGNALED when signalled
> by SIGINT, SIGTERM, SIGTSTP, etc...  In this case, EINTR
> should return I think.
> 
> Is it wrong?

Ah, if SA_RESTART is set, we should continue to read even
if signalled...

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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