GNU bug report logs - #25755
problem of "tail -F max-unchanged-stats "

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "chuyifan" <chuyifan <at> made-in-china.com>
To: <bug-coreutils <at> gnu.org>
Subject: problem of "tail -F max-unchanged-stats "
Date: Thu, 16 Feb 2017 16:18:41 +0800

[Message part 1 (text/plain, inline)]

Hi:

I found a problem of tail -F in centos 6.7. The kernel version is
2.6.32-642.3.1.el6. I execute "tail -f --follow=name
--max-unchanged-stats=50 --sleep-interval=1 ./t" in a terminal and execute
echo command to append some content to file t. then I execute "mv t t1", the
"tail -f " show error message of "no such file t" immediately.

The parameter of "--max-unchanged-stats" seems to have no effect. But in
centos 5.6, things is different. The parameter of "--max-unchanged-stats"
take effect. So I want to know the reason. Thank you. 

[Message part 2 (text/html, inline)]

Message #8 received at 25755 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: chuyifan <chuyifan <at> made-in-china.com>, 25755 <at> debbugs.gnu.org
Subject: Re: bug#25755: problem of "tail -F max-unchanged-stats "
Date: Thu, 16 Feb 2017 22:19:44 -0800

tag 25755 notabug
close 25755
stop

On 16/02/17 00:18, chuyifan wrote:
> Hi:
> 
> I found a problem of tail -F in centos 6.7. The kernel version is
> 2.6.32-642.3.1.el6. I execute "tail -f --follow=name
> --max-unchanged-stats=50 --sleep-interval=1 ./t" in a terminal and execute
> echo command to append some content to file t. then I execute "mv t t1", the
> "tail -f " show error message of "no such file t" immediately.
> 
> The parameter of "--max-unchanged-stats" seems to have no effect. But in
> centos 5.6, things is different. The parameter of "--max-unchanged-stats"
> take effect. So I want to know the reason. Thank you. 

Hi,

Since the inotify implementation, --max-unchanged-stats is ineffective,
and this is indicated in the man page in the description of that option.

thanks,
Pádraig

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