From: "Måns Rullgård" <mru@inprovide.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Quick close of all the open files.
Date: Tue, 06 Jun 2006 23:03:38 +0100 [thread overview]
Message-ID: <yw1xodx6gcw5.fsf@agrajag.inprovide.com> (raw)
In-Reply-To: <200606062156.k56LuWFD001871@turing-police.cc.vt.edu>
Valdis.Kletnieks@vt.edu writes:
> On Wed, 07 Jun 2006 03:15:43 +0530, vamsi krishna said:
>> Hello,
>>
>> I found that the following code is closing all the open files by the
>> program, do you think its a bug in kernel code?
>>
>> ------------
>> fp = tmpfile();
>> fp->_chain = stderr;
>> fpclose(fp);
>> fp = NULL;
>
> strace that, and see how many times close() gets called. If it gets
> called once, it's a kernel bug. If it gets called once for each open
> file, it's a userspace bug.
Actually, it's not a bug at all.
> For bonus points, how did you verify that all the open files were closed?
>
> (Hint - what does that fp->_chain = stderr *really* do? ;)
As it touches the innards of the FILE type, it invokes undefined
behavior. Nothing that follows can be considered a bug.
--
Måns Rullgård
mru@inprovide.com
next prev parent reply other threads:[~2006-06-06 22:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-06 21:45 vamsi krishna
2006-06-06 21:56 ` Valdis.Kletnieks
2006-06-06 22:02 ` vamsi krishna
2006-06-06 22:39 ` Måns Rullgård
2006-06-07 0:33 ` Valdis.Kletnieks
2006-06-07 1:22 ` vamsi krishna
2006-06-07 7:57 ` Måns Rullgård
2006-06-07 8:50 ` Bernd Petrovitsch
2006-06-07 7:56 ` Måns Rullgård
2006-06-06 22:03 ` Måns Rullgård [this message]
2006-06-07 11:12 ` linux-os (Dick Johnson)
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=yw1xodx6gcw5.fsf@agrajag.inprovide.com \
--to=mru@inprovide.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®