GNU bug report logs - #21241
25.0.50; gfilenotify doesn't indicate when limits are reached

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

From: Tassilo Horn <tsdh <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 10:16:54 +0200

When acquiring many file/directory watches using file-notify-add-watch
with file-notify--library being gfilenotify, there's no indication when
the limit of watches a user is allowed to place is reached.  You still
get a valid descriptor but the provided callback function won't be
called when the watched file/directory changes.

I've looked at the code and saw that with inotify you'd get an error.
Apparently, gfilenotify (aka glib) also uses inotify on my GNU/Linux box
under the hoods.  At least increasing the inotify limit for user watches
made it work again.

I tried looking at the GFileMonitor API docs.  It seems that
g_file_monitor should return NULL on errors (and I'd count a reached
limit an error), and the fourth parameter should be initialized with the
error.  Emacs calls it with no error parameter:

  monitor = g_file_monitor (gfile, gflags, NULL, NULL);

So I've tried the following:

--8<---------------cut here---------------start------------->8---
diff --git a/src/gfilenotify.c b/src/gfilenotify.c
index 08713a8..2ad2110 100644
--- a/src/gfilenotify.c
+++ b/src/gfilenotify.c
@@ -172,8 +172,9 @@ will be reported only in case of the 'moved' event.  */)
     gflags |= G_FILE_MONITOR_SEND_MOVED;
 
   /* Enable watch.  */
-  monitor = g_file_monitor (gfile, gflags, NULL, NULL);
-  if (! monitor)
+  GError *err = NULL;
+  monitor = g_file_monitor (gfile, gflags, NULL, &err);
+  if (! monitor || err != NULL)
     xsignal2 (Qfile_notify_error, build_string ("Cannot watch file"), file);
 
   Lisp_Object watch_descriptor = make_pointer_integer (monitor);
--8<---------------cut here---------------end--------------->8---

Unfortunately, the err variable won't be set in case the limit is
reached, too.  So it seems that we can't do much from Emacs land and
this should be reported as a glib bug (which I'll do).

Well, one thing we could do was preferring plain inotify over glib's
GFileMonitor when both are available.  On my GNU/Linux box both are
available and configure chose gfilenotify as the default.



In GNU Emacs 25.0.50.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-08-12 on thinkpad-t440p
Repository revision: 197f280042a4d901ea94acdf10f1dc544fae4750
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
System Description:	Arch Linux

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NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

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Message #8 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: 21241 <at> debbugs.gnu.org
Subject: Re: 25.0.50; gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 10:34:45 +0200

Here's the glib bug report I've just filed for this issue:

  https://bugzilla.gnome.org/show_bug.cgi?id=753549

Bye,
Tassilo

Message #11 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 21241 <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 15:47:00 +0300

> From: Tassilo Horn <tsdh <at> gnu.org>
> Date: Wed, 12 Aug 2015 10:16:54 +0200
> 
> Well, one thing we could do was preferring plain inotify over glib's
> GFileMonitor when both are available.  On my GNU/Linux box both are
> available and configure chose gfilenotify as the default.

I wonder if we should revert our decision to prefer gfilenotify if
available, and instead use it only if there's no other supported
method.  It begins to sound more and more like gfilenotify is more
trouble than it's worth.

Message #14 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 21241 <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 15:27:26 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Well, one thing we could do was preferring plain inotify over glib's
>> GFileMonitor when both are available.  On my GNU/Linux box both are
>> available and configure chose gfilenotify as the default.
>
> I wonder if we should revert our decision to prefer gfilenotify if
> available, and instead use it only if there's no other supported
> method.  It begins to sound more and more like gfilenotify is more
> trouble than it's worth.

You mean the other emacs-devel thread where it has been reported that
gfile notifications might get delayed up to 30 seconds?  I haven't seen
that issue here but if it can happen and gfilenotify doesn't provide
some clear benefit over plain inotify, I'd suggest to use the latter by
default when it's available.

Well, at least it seems that THIS issue is considered to be a bug also
by one glib developer so chances are good that it'll be fixed
eventually.  But of course it may take some time until a fixed version
is distributed to all users and until then users will have to learn the
hard way why notifications don't work [1].

Bye,
Tassilo

[1] I've been working on magit-filenotify.el which automatically
    refreshes the magit status buffer when something in the git
    repository changes, and at some point it just didn't work anymore
    (no notifications) for repositories I've started working on later
    while it still worked for those I've had opened earlier.  Well, that
    way I've at least learned about inotify limits and how to change
    them... :-)

Message #17 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 21241 <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 17:16:12 +0300

> From: Tassilo Horn <tsdh <at> gnu.org>
> Cc: 21241 <at> debbugs.gnu.org
> Date: Wed, 12 Aug 2015 15:27:26 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Well, one thing we could do was preferring plain inotify over glib's
> >> GFileMonitor when both are available.  On my GNU/Linux box both are
> >> available and configure chose gfilenotify as the default.
> >
> > I wonder if we should revert our decision to prefer gfilenotify if
> > available, and instead use it only if there's no other supported
> > method.  It begins to sound more and more like gfilenotify is more
> > trouble than it's worth.
> 
> You mean the other emacs-devel thread where it has been reported that
> gfile notifications might get delayed up to 30 seconds?

That, and this bug, and also the fact that it simply doesn't work on
Windows (no notifications come in), although the corresponding glib
tests all pass.  There's also bug#20417, and I think someone also
complained about gfilenotify on OS X.

> Well, at least it seems that THIS issue is considered to be a bug also
> by one glib developer so chances are good that it'll be fixed
> eventually.

Let's hope it will be.

Message #20 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 21241 <at> debbugs.gnu.org, Tassilo Horn <tsdh <at> gnu.org>
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Wed, 12 Aug 2015 21:18:45 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> > I wonder if we should revert our decision to prefer gfilenotify if
>> > available, and instead use it only if there's no other supported
>> > method.  It begins to sound more and more like gfilenotify is more
>> > trouble than it's worth.
>> 
>> You mean the other emacs-devel thread where it has been reported that
>> gfile notifications might get delayed up to 30 seconds?
>
> That, and this bug, and also the fact that it simply doesn't work on
> Windows (no notifications come in), although the corresponding glib
> tests all pass.  There's also bug#20417, and I think someone also
> complained about gfilenotify on OS X.

I would also agree to favor inotify when available.

On OS X (better: on systems which have defined HAVE_NS), we should
disable gfilenotify, because the Glib main loop won't be used (ns_select
is used rather than xg_select).

Best regards, Michael.

Message #23 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 21241 <at> debbugs.gnu.org,
 Tassilo Horn <tsdh <at> gnu.org>
Subject: Re: 25.0.50; gfilenotify doesn't indicate when limits are reached
Date: Fri, 14 Aug 2015 18:27:39 -0700

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

Michael Albinus writes:

> I would also agree to favor inotify when available.

Let's give that a try, then.  I installed the attached patch as master commit 
200c2b10faf298bf65e8b6dbd0cb9ef00b2f95d6.

> On OS X (better: on systems which have defined HAVE_NS), we should
> disable gfilenotify, because the Glib main loop won't be used (ns_select
> is used rather than xg_select).

configure.ac was trying to do that, but there was a typo.  Should also be fixed 
in the attached patch.

[0001-Default-to-inotify-instead-of-gfile.patch (text/x-diff, attachment)]

Message #26 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Michael Albinus <michael.albinus <at> gmx.de>, 21241 <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Tue, 18 Aug 2015 16:33:56 +0200

Paul Eggert <eggert <at> cs.ucla.edu> writes:

>> I would also agree to favor inotify when available.
>
> Let's give that a try, then.  I installed the attached patch as master
> commit 200c2b10faf298bf65e8b6dbd0cb9ef00b2f95d6.

FWIW, all my file-notification needs are still satisfied with inotify as
`file-notify--library', and now I also get an error when I run out of
allowed used watches.  So from my side, feel free to close this report
as gfilenotify's broken behavior is glib's bug, not ours.

Bye,
Tassilo

Message #31 received at 21241-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: Michael Albinus <michael.albinus <at> gmx.de>, 21241-done <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50; gfilenotify doesn't indicate when limits
 are reached
Date: Tue, 18 Aug 2015 10:09:03 -0700

Tassilo Horn wrote:
> So from my side, feel free to close this report
> as gfilenotify's broken behavior is glib's bug, not ours.

Thanks for checking; closing the bug.

Message #34 received at 21241 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 21241 <at> debbugs.gnu.org
Subject: Re: bug#21241: 25.0.50;
 gfilenotify doesn't indicate when limits are reached
Date: Fri, 21 Aug 2015 11:46:28 +0200

Tassilo Horn <tsdh <at> gnu.org> writes:

> So I've tried the following:
>
> diff --git a/src/gfilenotify.c b/src/gfilenotify.c
> index 08713a8..2ad2110 100644
> --- a/src/gfilenotify.c
> +++ b/src/gfilenotify.c
> @@ -172,8 +172,9 @@ will be reported only in case of the 'moved' event.  */)
>      gflags |= G_FILE_MONITOR_SEND_MOVED;
>  
>    /* Enable watch.  */
> -  monitor = g_file_monitor (gfile, gflags, NULL, NULL);
> -  if (! monitor)
> +  GError *err = NULL;
> +  monitor = g_file_monitor (gfile, gflags, NULL, &err);
> +  if (! monitor || err != NULL)
>      xsignal2 (Qfile_notify_error, build_string ("Cannot watch file"), file);
>  
>    Lisp_Object watch_descriptor = make_pointer_integer (monitor);

For the records, I've committed a modified version of this patch. It
returns the error message from g_file_monitor, if present.

Best regards, Michael.

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