GNU bug report logs - #13662
24.3.50; inotify-add-watch fails in batch mode

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#13662: closed (24.3.50; inotify-add-watch fails in batch mode)
Date: Fri, 17 Jan 2014 11:57:04 +0000

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Your message dated Fri, 17 Jan 2014 12:56:51 +0100
with message-id <87fvomstx8.fsf <at> gmx.de>
and subject line Re: bug#13662: 24.3.50; inotify-add-watch fails in batch mode
has caused the debbugs.gnu.org bug report #13662,
regarding 24.3.50; inotify-add-watch fails in batch mode
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Chong Yidong <cyd <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; inotify-add-watch fails in batch mode
Date: Sat, 09 Feb 2013 22:35:49 +0800

On latest trunk, `make check' fails with
2 unexpected results:
   FAILED  ert-test-record-backtrace
   FAILED  inotify-file-watch-simple

The first of this is Bug#13064 (still not fixed; I couldn't disentangle
the mess of CL-isms and closures involved in that bug).  The second
failure is relatively new: apparently, inotify-file-watch-simple works
when Emacs is interactive but fails in batch mode.

Another way to see this is to create a file with the contents

(let* ((temp-file (make-temp-file "inotify-simple"))
       (events 0)
       (wd
	(inotify-add-watch temp-file t (lambda (ev)
					 (setq events (1+ events))))))
  (unwind-protect
      (progn
	(with-temp-file temp-file
	  (insert "Foo\n"))
	(sit-for 5)
	(message ">> %d <<" events))
    (inotify-rm-watch wd)))

and run `emacs -batch -l foo.el'.  This prints ">> 0 <<", indicating
that the inotify watcher failed to run.  If you repeat omitting -batch,
">> 4 <<" is printed, as expected.


In GNU Emacs 24.3.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 3.6.4)
 of 2013-02-09 on tsparkle
Bzr revision: 111704 cyd <at> gnu.org-20130209050902-vge73m9xbyx96t2q
Windowing system distributor `The X.Org Foundation', version 11.0.11301000
Configured using:
 `configure --with-x-toolkit=gtk3 CFLAGS=-g --no-create --no-recursion'

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From: Michael Albinus <michael.albinus <at> gmx.de>
To: Chong Yidong <cyd <at> gnu.org>
Cc: 13662-done <at> debbugs.gnu.org
Subject: Re: bug#13662: 24.3.50; inotify-add-watch fails in batch mode
Date: Fri, 17 Jan 2014 12:56:51 +0100

Chong Yidong <cyd <at> gnu.org> writes:

> Another way to see this is to create a file with the contents
>
> (let* ((temp-file (make-temp-file "inotify-simple"))
>        (events 0)
>        (wd
> 	(inotify-add-watch temp-file t (lambda (ev)
> 					 (setq events (1+ events))))))
>   (unwind-protect
>       (progn
> 	(with-temp-file temp-file
> 	  (insert "Foo\n"))
> 	(sit-for 5)
> 	(message ">> %d <<" events))
>     (inotify-rm-watch wd)))
>
> and run `emacs -batch -l foo.el'.  This prints ">> 0 <<", indicating
> that the inotify watcher failed to run.  If you repeat omitting -batch,
> ">> 4 <<" is printed, as expected.

Should be fixed with r116052. Instead of `sit-for', one needs to apply
`read-event'.

Best regards, Michael.

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