From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2A51C4363A for ; Mon, 26 Oct 2020 17:13:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7897F20719 for ; Mon, 26 Oct 2020 17:13:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1787419AbgJZRNZ (ORCPT ); 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 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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