Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #91950

Re: fork/exec & close file descriptors

Path csiph.com!usenet.pasdenom.info!news.redatomik.org!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path <random832@fastmail.us>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.007
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'context': 0.05; 'one?': 0.05; 'redirected': 0.07; 'subject:file': 0.07; 'alain': 0.09; 'received:internal': 0.09; 'wed,': 0.15; '"some': 0.16; '(e.g.)': 0.16; 'descriptors': 0.16; 'library"': 0.16; 'message- id:@webmail.messagingengine.com': 0.16; 'received:10.202': 0.16; 'received:10.202.2': 0.16; 'received:66.111': 0.16; 'received:66.111.4': 0.16; 'received:messagingengine.com': 0.16; 'wrote:': 0.16; 'library': 0.20; 'header:In-Reply-To:1': 0.24; 'this.': 0.28; 'subject:/': 0.29; 'generally': 0.32; 'ordered': 0.33; 'file': 0.34; 'useful': 0.35; 'to:addr:python-list': 0.35; "isn't": 0.35; 'closing': 0.36; 'received:10': 0.37; 'subject:: ': 0.37; 'received:66': 0.38; 'mean': 0.38; 'thank': 0.39; 'to:addr:python.org': 0.39; 'where': 0.40; 'some': 0.40; 'your': 0.60; 'back': 0.61; 'close': 0.61; 'from:no real name:2**0': 0.61; "you've": 0.61; 'header:Message-Id:1': 0.62; 'within': 0.64; 'subject: & ': 0.73; 'ranges': 0.76; 'absolutely': 0.87
DKIM-Signature v=1; a=rsa-sha1; c=relaxed/relaxed; d=fastmail.us; h= content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-sasl-enc :x-sasl-enc; s=mesmtp; bh=SbZn2OWArgDt6fqLsJrJF9xUc64=; b=GvKyCO bTE3r2/wSBjqz8dgAFRmuqQkfiOXttSCSUdnnKCJWt5Z5RS4zPjRXECcGREVGpPV xwp0P4+MGj9EXb9x8Tr8Ili5HZK22JUr3I9btZx+VA+PAF3Fram1v6NqNq2krK9O CAueMup40XoNMFyXv7l+SyzP+PFRDv1zNWU4Q=
DKIM-Signature v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-sasl-enc:x-sasl-enc; s=smtpout; bh=SbZn2OWArgDt6fq LsJrJF9xUc64=; b=MzFRBuJi9644kPlZZFJU7VIjKHsNP9d+8aoLuPdJUvv0Zdo 0EzJfmJV19xbJAaA6N+ngzvOfzviCLNqu6kT+bcOwKWRcQMJPqKvOAA8PQGZapuW 6z7Idm85zYwdQmuE26vh60n7CI0XLaGDDmjed/EH56DsmkevLTzhMljzFV5c=
X-Sasl-Enc K+0UvQNoh3quh0OY9RnF9sb4WNGZ0oT8vnnHUVV6qCnd 1433334069
From random832@fastmail.us
To python-list@python.org
MIME-Version 1.0
Content-Transfer-Encoding 7bit
Content-Type text/plain
X-Mailer MessagingEngine.com Webmail Interface - ajax-073992ec
Subject Re: fork/exec & close file descriptors
Date Wed, 03 Jun 2015 08:21:09 -0400
In-Reply-To <87h9qpl10o.fsf@universite-de-strasbourg.fr.invalid>
References <CANc-5UyeaWqThGFSAuGskz+S2Lrgq0ia9W9DHAie28t9GY+sww@mail.gmail.com> <mailman.59.1433253538.13271.python-list@python.org> <87pp5eksnc.fsf@universite-de-strasbourg.fr.invalid> <87eglt7u5i.fsf@elektro.pacujo.net> <87lhg1lt00.fsf@universite-de-strasbourg.fr.invalid> <mailman.84.1433289254.13271.python-list@python.org> <87h9qpl10o.fsf@universite-de-strasbourg.fr.invalid>
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.20+
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.103.1433334072.13271.python-list@python.org> (permalink)
Lines 14
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1433334072 news.xs4all.nl 2896 [2001:888:2000:d::a6]:59830
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:91950

Show key headers only | View raw

On Wed, Jun 3, 2015, at 03:11, Alain Ketterlin wrote:
> Thank you, I know this. What I mean is: what are the reasons that you
> cannot access your file descriptors one by one? To me closing a range of
> descriptors has absolutely no meaning, simply because ranges have no
> meaning for file descriptors (they're not ordered in any way). What if
> some library uses its own descriptors that happen to lie in your
> "range"? Etc.

The context in which this is useful is that you've just forked, and
you're about to exec. "Some library" isn't going to ever get back
control within the current process. Generally the range of file
descriptors you want to close is (e.g.) 3-Infinity, after you've already
got 0 1 and 2 pointing to where you want them (whatever redirected file
or pipe).

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: fork/exec & close file descriptors Skip Montanaro <skip.montanaro@gmail.com> - 2015-06-02 08:58 -0500
  Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-02 18:28 +0300
    Re: fork/exec & close file descriptors Skip Montanaro <skip.montanaro@gmail.com> - 2015-06-02 10:42 -0500
      Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-02 19:24 +0300
        Re: fork/exec & close file descriptors Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2015-06-02 16:37 +0000
    Re: fork/exec & close file descriptors MrJean1 <MrJean1@gmail.com> - 2015-06-12 13:43 -0700
  Re: fork/exec & close file descriptors Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-06-02 17:59 +0200
    Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-02 23:05 +0300
      Re: fork/exec & close file descriptors Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-06-02 23:06 +0200
        Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 01:24 +0300
          Re: fork/exec & close file descriptors Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-06-03 09:21 +0200
            Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 10:41 +0300
              Re: fork/exec & close file descriptors alister <alister.nospam.ware@ntlworld.com> - 2015-06-03 09:38 +0000
                Re: fork/exec & close file descriptors Steven D'Aprano <steve@pearwood.info> - 2015-06-03 22:07 +1000
                Re: fork/exec & close file descriptors alister <alister.nospam.ware@ntlworld.com> - 2015-06-03 12:18 +0000
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 15:27 +0300
                Re: fork/exec & close file descriptors alister <alister.nospam.ware@ntlworld.com> - 2015-06-03 13:05 +0000
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 17:49 +0300
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 15:25 +0300
                Re: fork/exec & close file descriptors random832@fastmail.us - 2015-06-03 08:54 -0400
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 16:08 +0300
                Re: fork/exec & close file descriptors random832@fastmail.us - 2015-06-03 09:21 -0400
                Re: fork/exec & close file descriptors Chris Angelico <rosuav@gmail.com> - 2015-06-03 23:32 +1000
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 16:33 +0300
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-03 17:43 +0300
                Re: fork/exec & close file descriptors random832@fastmail.us - 2015-06-03 16:08 -0400
                Re: fork/exec & close file descriptors Marko Rauhamaa <marko@pacujo.net> - 2015-06-04 00:09 +0300
                Re: fork/exec & close file descriptors random832@fastmail.us - 2015-06-03 16:07 -0400
                Re: fork/exec & close file descriptors Chris Angelico <rosuav@gmail.com> - 2015-06-04 07:54 +1000
        Re: fork/exec & close file descriptors Chris Angelico <rosuav@gmail.com> - 2015-06-03 09:54 +1000
          Re: fork/exec & close file descriptors Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-06-03 09:11 +0200
            Re: fork/exec & close file descriptors random832@fastmail.us - 2015-06-03 08:21 -0400
              Re: fork/exec & close file descriptors Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-06-03 15:16 +0200
        Re: fork/exec & close file descriptors Skip Montanaro <skip.montanaro@gmail.com> - 2015-06-02 20:21 -0500

csiph-web