GNU bug report logs - #18880
25.0.50; inotify-based file notifications missing sometimes

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dima Kogan <dima <at> secretsauce.net>
Subject: bug#18880: closed (Re: bug#18880: 25.0.50; inotify-based file
 notifications missing sometimes)
Date: Tue, 17 Feb 2015 19:32:03 +0000

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Your bug report

#18880: 25.0.50; inotify-based file notifications missing sometimes

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 18880 <at> debbugs.gnu.org.

-- 
18880: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18880
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Dima Kogan <dima <at> secretsauce.net>
Cc: 18880-done <at> debbugs.gnu.org
Subject: Re: bug#18880: 25.0.50;
 inotify-based file notifications missing sometimes
Date: Tue, 17 Feb 2015 20:30:52 +0100

Version: 24.5

Michael Albinus <michael.albinus <at> gmx.de> writes:

> I've committed a patch to the emacs-24 branch; could you, please, check?

No reaction for weeks; I set this bug as closed. If there are still
problems, please reopen.

Best regards, Michael.

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From: Dima Kogan <dima <at> secretsauce.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; inotify-based file notifications missing sometimes
Date: Tue, 28 Oct 2014 17:11:10 -0700

This bug is about an issue on the emacs-devel-mailing list:

 http://lists.gnu.org/archive/html/emacs-devel/2014-10/msg00911.html

The main message is copied below:

I ran into an issue with inotify-base file notifications when looking at
auto-revert stuff from an earlier thread. To show the issue, I build
the latest emacs from source using

 ./configure --with-file-notification=inotify

I then run

 ./emacs --eval "`cat  /tmp/tstnotify.el`" -Q -nw

with tstnotify.el being

 (progn
   (require 'filenotify)

   (dolist (fil '("/tmp/tst1" "/tmp/tst2"))
     (file-notify-add-watch fil  '(change attribute-change)
                            (lambda (event)
                              (message "notify event %s" event)))
     (find-file fil))
   (switch-to-buffer "*Messages*"))


Here I ask for notifications for two files, and print out the events as
they come in. While emacs is running this way, I modify those two files
using an external tool. I would expect to see modification events for
both of these files, but I only see them for one of the files.

The issue is that emacs doesn't ask inotify to look at the two files, it
asks it to look at the containing directory (/tmp in both cases),
filtering out all the files we don't care about later. inotify is being
intelligent, notices that we're asking to monitor the same object twice
(/tmp), and simply returns the same descriptor a second time. Emacs is
assuming a unique descriptor, and the result is that we only get
notifications for one file.

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