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[23.128.96.18]) by mx.google.com with ESMTP id m22si7551456eds.570.2020.10.26.13.04.40; Mon, 26 Oct 2020 13:05:11 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1787415AbgJZRNZ (ORCPT + 99 others); Mon, 26 Oct 2020 13:13:25 -0400 Received: from esgaroth.petrovitsch.at ([78.47.184.11]:2197 "EHLO esgaroth.tuxoid.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1787410AbgJZRNY (ORCPT ); Mon, 26 Oct 2020 13:13:24 -0400 Received: from [10.68.100.236] (h10-gesig.woeg.acw.at [217.116.178.11] (may be forged)) (authenticated bits=0) by esgaroth.tuxoid.at (8.15.2/8.15.2) with ESMTPSA id 09QHCfFK011875 (version=TLSv1 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Mon, 26 Oct 2020 18:12:42 +0100 Subject: Re: SIGHUP on connect To: "Michael J. Baars" , linux-kernel@vger.kernel.org References: <0e0db8180bc560c9ebaeb42957cf2ecc365cc80d.camel@cyberfiber.eu> From: Bernd Petrovitsch X-Pep-Version: 2.0 Message-ID: <8b693bb1-1711-5289-5bc8-e5955da21968@petrovitsch.priv.at> Date: Mon, 26 Oct 2020 17:12:40 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <0e0db8180bc560c9ebaeb42957cf2ecc365cc80d.camel@cyberfiber.eu> Content-Type: multipart/mixed; boundary="------------487907C5065892292380EEF5" Content-Language: en-US X-DCC-wuwien-Metrics: esgaroth.tuxoid.at 1290; Body=2 Fuz1=2 Fuz2=2 X-Virus-Scanned: clamav-milter 0.97 at esgaroth.tuxoid.at X-Virus-Status: Clean X-Spam-Status: No, score=-0.9 required=5.0 tests=ALL_TRUSTED,AWL autolearn=unavailable version=3.3.1 X-Spam-Report: * -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.1 AWL AWL: Adjusted score from AWL reputation of From: address X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on esgaroth.tuxoid.at Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --------------487907C5065892292380EEF5 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi all! On 25/10/2020 16:11, Michael J. Baars wrote: [...] > I've been writing a simple client and server for cluster computing this= weekend. At first everything appeared to work just fine, but soon enough= I found some > inexplicable bind errors. I've tried to make sure that the client close= s it's sockets before the server closes it's sockets, to prevent linger, = but trying did Which were exactly? English/original text pls ... And The close() (and shutdown() syscalls, respectively) don't avoid the FIN_WAIT2 timeout on a closed socket. Just set the SO_REUSEADDR socket option on the listening socket. > not help. Now I think I found the problem. Then solve it. > Please do have a look at the code. It looks like the SIGHUP is sent to = the server not on close or exit, but on the connect instead. Too lazy to save and uncompress the file ... 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