Path: csiph.com!usenet.pasdenom.info!news.albasani.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.081 X-Spam-Evidence: '*H*': 0.84; '*S*': 0.00; 'python': 0.11; 'windows': 0.15; 'block.': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'loops': 0.16; 'lurking': 0.16; 'subject:programming': 0.16; 'sat,': 0.16; 'wrote:': 0.18; 'machine': 0.22; "haven't": 0.24; 'task': 0.26; 'header:In-Reply- To:1': 0.27; 'message-id:@mail.gmail.com': 0.30; 'code': 0.31; 'second,': 0.31; 'option': 0.32; 'open': 0.33; 'url:python': 0.33; 'problem': 0.35; "can't": 0.35; 'skip:s 30': 0.35; 'something': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'machine.': 0.36; 'done': 0.36; 'url:org': 0.36; 'should': 0.36; 'manager': 0.38; 'url:library': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'short': 0.38; 'to:addr:python.org': 0.39; 'ensure': 0.60; 'easy': 0.60; 'url:3': 0.61; 'first': 0.61; 'close': 0.67; 'anything.': 0.68; 'interrupt': 0.84; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type:content-transfer-encoding; bh=tl5WBfQ+05S0RCR2Oel35h/no0XtN9D1PE9D6Hdf9+E=; b=NQeXWP18o6eAcOojfwYTmj630MdrNk+IaWmMly4JZbkEY9SsoCvI/M2ypAE7o762Dj IEnHjzIved7gSKyHs3ErJ94uTOu+5AJ7I04pGU+fjLBu+OZkhswJsYig/8FrduQh50hH C1siUucFVSiFnAC6xWZtPQk2d/mP5QgzyFbXmVZ1O9rJzCSaChqmX0fjnWynGZvND8Cm nLA85lEAX/pxNGYD5fe6o1+aUv7XIeJKbTvNRFhatRKCU+z4rm6cuqa7ug9Fl5jfpZL8 HTLTjKvHMrNaOIyp9qLzS9GuYec3UmbOrHKduv6KeBC1dJxlEj0KckgUtC94LxmbeTPp Qjog== MIME-Version: 1.0 X-Received: by 10.58.15.193 with SMTP id z1mr4422524vec.40.1367634218329; Fri, 03 May 2013 19:23:38 -0700 (PDT) In-Reply-To: <4aef55bd-f550-4a3d-b11a-285b6fa9892b@googlegroups.com> References: <4aef55bd-f550-4a3d-b11a-285b6fa9892b@googlegroups.com> Date: Sat, 4 May 2013 12:23:38 +1000 Subject: Re: socket programming From: Chris Angelico To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 26 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1367634220 news.xs4all.nl 15938 [2001:888:2000:d::a6]:48331 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:44699 On Sat, May 4, 2013 at 12:13 PM, Pedro wrote: > First - this code constantly loops around an open socket. Is there a way = to use something like an interrupt so I don't have to loop constantly to mo= nitor the socket? The accept() call should block. It's not going to spin or anything. If you need to monitor multiple sockets, have a look at select(). > Second, if any part of the program fails execution (crashes) the port oft= en remains open on my windows machine and the only way to close it that i k= now of is through task manager or by rebooting the machine. Is there an eas= y way around this problem ? If I don't close the port the program can't ope= n it again and crashes. It remains for a short time to ensure that there's no lurking connections. You can bypass this check by setting the SO_REUSEADDR option - lemme hunt that down in the Python docs, haven't done that in Python for a while... http://docs.python.org/3.3/library/socket.html#socket.socket.setsockopt s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) That should do the job. ChrisA