Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Assaf Gordon <assafgordon@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 28432) by debbugs.gnu.org; 14 Sep 2017 01:11:55 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Sep 13 21:11:55 2017 Received: from localhost ([127.0.0.1]:39204 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1dsIh9-0004B7-3y for submit <at> debbugs.gnu.org; Wed, 13 Sep 2017 21:11:55 -0400 Received: from mail.magicbluesmoke.com ([82.195.144.49]:51038) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <P@HIDDEN>) id 1dsIh6-0004Ax-9p for 28432 <at> debbugs.gnu.org; Wed, 13 Sep 2017 21:11:52 -0400 Received: from localhost.localdomain (c-73-158-116-184.hsd1.ca.comcast.net [73.158.116.184]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.magicbluesmoke.com (Postfix) with ESMTPSA id 886A24B02; Thu, 14 Sep 2017 02:11:50 +0100 (IST) Subject: Re: bug#28432: dd doesn't warn about partial read on final call to iread To: Barry Handelman <barry.handelman@HIDDEN>, 28432 <at> debbugs.gnu.org References: <CAD4Br39yrmeU_r9_bfmoHMGC8XkRLdXiuM4M_M5rhRD3d=6k0Q@HIDDEN> From: =?UTF-8?Q?P=c3=a1draig_Brady?= <P@HIDDEN> Message-ID: <e825bd60-8c61-2d86-4cba-fd68fc9fabcf@HIDDEN> Date: Wed, 13 Sep 2017 18:11:48 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <CAD4Br39yrmeU_r9_bfmoHMGC8XkRLdXiuM4M_M5rhRD3d=6k0Q@HIDDEN> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 28432 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: 0.0 (/) On 12/09/17 08:51, Barry Handelman wrote: > The iread function in dd.c issues a warning if the previous read was short, > suggesting that you use iflag=fullblock > > However, the warning is issued when the previous call to iread was partial, > so if only the final read was short then no warning is issued. > Importantly, this will always be the case when there was only one read, and > it was partial. > > I'd suggest that if the strategy of warning on subsequent reads is to be > used, the warning routine should be run once again after the final read. The current approach was discussed at https://bugs.gnu.org/7362 A short read as the last read would be a common situation though? You're specifically looking for the following to warn? (echo; sleep 1; echo) | dd count=1 bs=512 That may be a bit aggressive as that could be used to read the current data available, up to a specified max. cheers, Pádraig.
bug-coreutils@HIDDEN:bug#28432; Package coreutils.
Full text available.Received: (at submit) by debbugs.gnu.org; 12 Sep 2017 15:54:43 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 12 11:54:43 2017 Received: from localhost ([127.0.0.1]:36055 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1drnWN-00042g-HP for submit <at> debbugs.gnu.org; Tue, 12 Sep 2017 11:54:43 -0400 Received: from eggs.gnu.org ([208.118.235.92]:33705) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <barry.handelman@HIDDEN>) id 1drnTf-0003y0-Rd for submit <at> debbugs.gnu.org; Tue, 12 Sep 2017 11:51:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <barry.handelman@HIDDEN>) id 1drnTZ-0005no-8w for submit <at> debbugs.gnu.org; Tue, 12 Sep 2017 11:51:50 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=BAYES_40,FREEMAIL_FROM, HTML_MESSAGE,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:37572) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <barry.handelman@HIDDEN>) id 1drnTZ-0005nh-5W for submit <at> debbugs.gnu.org; Tue, 12 Sep 2017 11:51:49 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52897) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <barry.handelman@HIDDEN>) id 1drnTX-0006fm-W7 for bug-coreutils@HIDDEN; Tue, 12 Sep 2017 11:51:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <barry.handelman@HIDDEN>) id 1drnTU-0005ld-6i for bug-coreutils@HIDDEN; Tue, 12 Sep 2017 11:51:48 -0400 Received: from mail-wr0-x236.google.com ([2a00:1450:400c:c0c::236]:37150) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from <barry.handelman@HIDDEN>) id 1drnTU-0005ji-02 for bug-coreutils@HIDDEN; Tue, 12 Sep 2017 11:51:44 -0400 Received: by mail-wr0-x236.google.com with SMTP id k20so23693488wre.4 for <bug-coreutils@HIDDEN>; Tue, 12 Sep 2017 08:51:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=2eWxXOJBGCjN12VRZFV4YohFHQ50XNMBGjwvKfs+24g=; b=GEyf3OtFmjo6s0EgTfZa5ZvsiRaos6a53HZ/zMcnGZqLJbe6fn6Sy6FSz8UxnFczti YpXLS0JnpbUd03MPigkdf0HwXIwQCgQksLqIOsSz6iBQW17suhJln0ND9s4Rs8023h2w s2YTeSDC8qznomLayG3uoAssrQbHJJspE90MZ2rX9mqosbYhOtV/w8GTRBXbaMGcbwAY VZ3hwtOFwEKawDcWmaYdMEwuQryRTpzJ5puQTUIIXVi3SuBcFRr/qxsgRBGxZQYH4iBZ 7omyMM1qYGtsxGQJSMMC7TJAL0gNF96F1cgSJH4rhu3r37D/Se6DYdvAZok7qHHwEDm3 UY0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=2eWxXOJBGCjN12VRZFV4YohFHQ50XNMBGjwvKfs+24g=; b=fE+tdTWxrIntsMLEslCT1o+JSffJe3Pj0bKSCRuC+d0h5SfjLZl6UFtV2+rBgfUjZ+ CQTjwICfIvLBG8vcm7hoFeOfN7k/T2rVSexfiN5jxDxDifDnzscmIzSoOFAOQuCELDfO jYDdcjMEpXaCQb2O/kKczVmUhO597EroetVPMKUysFzPwhLyWOtVkZ18JdHZsF4RvhdB ajgbYvi9xsnk5MuNlP+VyD9OlXUbWoJFhW9RAMPluYtGq0x54TbEC+71e6/TGBVZLC7Y ARSWww6hb12QdgnsCK/EQzSoGGAPcRyrZ2WToyvjPnLU7BmziNb9BzIIehVZqb3v/bMm 7r4Q== X-Gm-Message-State: AHPjjUh5s7bSSwITWDa55izmdl3ip98BRv02W9t1NwunUC3HF95oTlrT 9IEwal1mTcgbBV2HFrpWHsjcb88bhQ== X-Google-Smtp-Source: ADKCNb54OXGVfFdlToHyKBZbg+N28VSUxT642PkTGu4liJmjvghv0MxGVbAknxdt1uHiEpQGM2elLYsJNoIx3JgzyLo= X-Received: by 10.223.172.66 with SMTP id v60mr12662853wrc.143.1505231501158; Tue, 12 Sep 2017 08:51:41 -0700 (PDT) MIME-Version: 1.0 From: Barry Handelman <barry.handelman@HIDDEN> Date: Tue, 12 Sep 2017 15:51:30 +0000 Message-ID: <CAD4Br39yrmeU_r9_bfmoHMGC8XkRLdXiuM4M_M5rhRD3d=6k0Q@HIDDEN> Subject: dd doesn't warn about partial read on final call to iread To: bug-coreutils@HIDDEN Content-Type: multipart/alternative; boundary="f403045cf152ee74b705590004c8" X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Tue, 12 Sep 2017 11:54:41 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -4.0 (----) --f403045cf152ee74b705590004c8 Content-Type: text/plain; charset="UTF-8" The iread function in dd.c issues a warning if the previous read was short, suggesting that you use iflag=fullblock However, the warning is issued when the previous call to iread was partial, so if only the final read was short then no warning is issued. Importantly, this will always be the case when there was only one read, and it was partial. I'd suggest that if the strategy of warning on subsequent reads is to be used, the warning routine should be run once again after the final read. --f403045cf152ee74b705590004c8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr"><div>The iread function in dd.c issues a warning if the pr= evious read was short, suggesting that you use iflag=3Dfullblock<br></div><= div><br></div><div>However, the warning is issued when the previous call to= iread was partial, so if only the final read was short then no warning is = issued.=C2=A0 Importantly, this will always be the case when there was only= one read, and it was partial.</div><div><br></div><div>I'd suggest tha= t if the strategy of warning on subsequent reads is to be used, the warning= routine should be run once again after the final read. =C2=A0</div></div> --f403045cf152ee74b705590004c8--
Barry Handelman <barry.handelman@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.bug-coreutils@HIDDEN:bug#28432; Package coreutils.
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