GNU bug report logs - #26127
26.0.50; Using file-notify-rm-watch on invalid descriptor raises invalid-function

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

From: Andreas Politz <politza <at> hochschule-trier.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; Using file-notify-rm-watch on invalid descriptor raises
 invalid-function
Date: Thu, 16 Mar 2017 15:23:16 +0100

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

Calling file-notify-rm-watch on an invalid descriptor may throw a
invalid-function error, but it should throw a file-notify-error instead.

For example, this may occur when calling the function multiple times on
the same descriptor.

The error stems from file-notify--rm-descriptor, which contains the expression

      (funcall
       (cdr (assoc file (cdr registered)))
       `(,descriptor stopped ,(if file (expand-file-name file dir)
       dir)))

, but (assoc file (cdr registered)) is nil.  I think this error is
confusing.

Attached you'll find a test case for this.

-ap

[file-notify-bug-2.el (application/emacs-lisp, attachment)]

[Message part 3 (text/plain, inline)]

In GNU Emacs 26.0.50 (build 1, x86_64-unknown-linux-gnu, GTK+ Version 3.22.9)
 of 2017-03-15 built on luca
Repository revision: 2f972349bdc99d5d9ebf63169c00e24b119aa38d
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description:	Arch Linux

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Message #8 received at 26127 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Andreas Politz <politza <at> hochschule-trier.de>
Cc: 26127 <at> debbugs.gnu.org
Subject: Re: bug#26127: 26.0.50;
 Using file-notify-rm-watch on invalid descriptor raises
 invalid-function
Date: Fri, 17 Mar 2017 10:31:59 +0100

Andreas Politz <politza <at> hochschule-trier.de> writes:

Hi Andreas,

Thanks for the bug report!

> Calling file-notify-rm-watch on an invalid descriptor may throw a
> invalid-function error, but it should throw a file-notify-error instead.

`file-notify-error' shall appear only from `file-notify-add-watch'.
`file-notify-rm-watch' shall not raise an error at all.

> For example, this may occur when calling the function multiple times on
> the same descriptor.
>
> The error stems from file-notify--rm-descriptor, which contains the expression
>
>       (funcall
>        (cdr (assoc file (cdr registered)))
>        `(,descriptor stopped ,(if file (expand-file-name file dir)
>        dir)))
>
> , but (assoc file (cdr registered)) is nil.  I think this error is
> confusing.

I've fixed this in the master branch; there shouldn't be an error anymore.

> Attached you'll find a test case for this.

Thanks also for this. I've added it, modified, to filenotify-tests.el.

> -ap

Best regards, Michael.

Message #13 received at 26127-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Andreas Politz <politza <at> hochschule-trier.de>
Cc: 26127-done <at> debbugs.gnu.org
Subject: Re: bug#26127: 26.0.50;
 Using file-notify-rm-watch on invalid descriptor raises
 invalid-function
Date: Mon, 27 Mar 2017 16:52:55 +0200

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

> I've fixed this in the master branch; there shouldn't be an error anymore.

Nobody reported that this doesn't work, so I'm closing the bug.

>> -ap

Best regards, Michael.

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