From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 48380 invoked by alias); 10 Oct 2018 09:53:06 -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 48196 invoked by uid 89); 10 Oct 2018 09:53:05 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=AWL,BAYES_00,NORMAL_HTTP_TO_IP,RCVD_IN_DNSWL_NONE,SPF_PASS autolearn=ham version=3.3.2 spammy=H*F:D*nl, D*@, executive X-HELO: lb1-smtp-cloud7.xs4all.net Received: from lb1-smtp-cloud7.xs4all.net (HELO lb1-smtp-cloud7.xs4all.net) (194.109.24.24) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 10 Oct 2018 09:53:03 +0000 Received: from tmp.vlWPQAcpnV ([83.162.234.136]) by smtp-cloud7.xs4all.net with ESMTPSA id ABAogKAEpw2L8ABAqgotD9; Wed, 10 Oct 2018 11:53:00 +0200 Date: Wed, 10 Oct 2018 09:53:00 -0000 Message-ID: <6e92e94397270abb3a0fb6f2e2ae569b@smtp-cloud7.xs4all.net> From: Houder Reply-To: cygwin@cygwin.com To: cygwin@cygwin.com Subject: Re: grep < fifo fails References: <8100972155fcccd61852c0c9e48cd11b@smtp-cloud9.xs4all.net> <4749b23a0374bf264ad46a0c7466e73e@smtp-cloud9.xs4all.net> In-Reply-to: <4749b23a0374bf264ad46a0c7466e73e@smtp-cloud9.xs4all.net> Content-Type: text/plain; charset=UTF-8; format=fixed User-Agent: mua.awk 0.99 X-SW-Source: 2018-10/txt/msg00086.txt.bz2 On Mon, 08 Oct 2018 10:24:01, Houder wrote: ... > > > > On Wed, 3 Oct 2018 15:37:14, Ole Tange wrote: > > > > > This works: > > > > > > > > > > $ mkfifo fifo > > > > > $ echo > fifo & grep . fifo > > > > > [1] 10232 > > > > > [1]+ Done echo > fifo > > > > > > > > > > But this fails: > > > > > > > > > > $ echo > fifo & grep . < fifo > > > > > [1] 11756 > > > > > grep: (standard input): Invalid argument > > > > > [1]+ Done echo > fifo ... > grep fails on Cygwin because lseek() on Cygwin fails to recognize > that it is applied to a FIFO. As result of that, it returns EINVAL > in errno, where it should return ESPIPE. [snip] > The solution would be either to correct Cygwin's executive or to > insert a Cygwin-specific kludge in grep (in reset() ). Right. 64-@@ echo aaa > fifo & grep . < fifo [1] 3956 aaa [2]+ Done echo aaa > fifo The following rough patch to the Cygwin executive ... uhm, Cygwin DLL, makes the above work. winsup/cygwin/fhandler.h: class fhandler_fifo: public fhandler_base_overlapped { ... // Henri off_t lseek (off_t, int) { set_errno (ESPIPE); return -1; } ... }; (I cheated; I did a copy/paste of what is already present in fhandler.h) Regards, Henri -- 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