Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.albasani.net!feeder.news-service.com!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'received:209.85.212.46': 0.03; 'received:mail-vw0-f46.google.com': 0.03; 'ubuntu': 0.04; 'wed,': 0.04; 'subject:don': 0.09; 'tty': 0.09; 'am,': 0.14; 'wrote:': 0.14; '"with': 0.16; "'rb')": 0.16; 'inherited': 0.16; 'solves': 0.16; 'stdin': 0.16; 'subject:ssh': 0.16; 'subject:skip:s 10': 0.16; 'input': 0.18; 'handles': 0.20; 'cc:no real name:2**0': 0.20; '(which': 0.21; 'help.': 0.22; 'header:In- Reply-To:1': 0.22; 'cc:addr:python-list': 0.22; 'received:209.85.212': 0.25; 'instead': 0.26; 'url:mailman': 0.27; 'message-id:@mail.gmail.com': 0.28; 'problem': 0.29; 'operating': 0.30; 'cc:addr:python.org': 0.31; 'cc:addr:gmail.com': 0.31; 'none,': 0.31; 'url:library': 0.31; 'thank': 0.32; 'url:listinfo': 0.33; 'url:docs': 0.33; 'using': 0.34; 'there': 0.35; 'file': 0.35; 'background': 0.37; 'connected': 0.37; 'received:209.85': 0.37; 'url:python': 0.37; 'run': 0.37; 'apr': 0.38; 'received:google.com': 0.38; 'url:org': 0.38; 'cc:2**1': 0.38; 'likely': 0.39; 'received:209': 0.39; 'header:Received:5': 0.40; 'charset:windows-1252': 0.61; '2011': 0.62; 'reads': 0.65; '12:47': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=6oFG4kZnrKtO07CPQDlryO9WqLIhoLIEsoGIqnOPjsU=; b=rk4eqHXA+ZEJfxEwSs1VfaYGNHq9WvHDOak3+X+hJC/71VePt3m3qxZcQVC5T1EPwu w0hC/2pVVhSf1Xmepneg741vC2LAScEp9xNVpFskg5FxqxZ/kY4Txn8bvPmeOpzY3NXO BkbE1JMvYU0RbtGjMSeJHm6QNn2VcXzMVzHGM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=NinMI0ylbSUHuaDHFVTg9IXQlk9YlD6/FEvNP1Mr3ZQqmCczUGjqYfdU4uPVR/Y/jI oGElFHVH/nYfHAWRndUwNU9n08H/QF0WWQEFbxyq8ZkDdM4h7kulo2i4UA53Knb3HI8L 2ES6u2HguCBcgJWn4pwK2axBldDj/H4MceXOA= MIME-Version: 1.0 In-Reply-To: <4D9C36A90200001B00002FFE@smtp.nfra.nl> References: <4D9523EF0200001B00016CE4@smtp.nfra.nl> <4D9C36A90200001B00002FFE@smtp.nfra.nl> Date: Wed, 6 Apr 2011 10:43:19 -0700 Subject: Re: Behaviour of subprocess.Popen, ssh and nohup I don't understand From: Dan Stromberg To: Adriaan Renting Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 82.94.164.166 X-Trace: 1302111802 news.xs4all.nl 41102 [::ffff:82.94.164.166]:59063 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:2714 On Wed, Apr 6, 2011 at 12:47 AM, Adriaan Renting wrote: > > > This solves the problem using stdin=3Dopen(os.devnull, 'rb') instead of > stdin=3DNone makes it run even if there is input from stdin in the > foreground process. > > The operating system is Ubuntu 8.04 > I understood what Suspended (tty input) means. I don't understand why > it waits for input if stdin=3DNone. > > Thank you for your help. > > Adriaan Renting. > -- > http://mail.python.org/mailman/listinfo/python-list http://docs.python.org/library/subprocess.html "With None, no redirection will occur; the child=92s file handles will be inherited from the parent." When a background process reads from a tty (which is most likely what its inherited stdin is connected to), it gets a SIGTTIN, suspending your background process. See also "ssh -n".