GNU bug report logs - #33782
27.0.50; Emacsclient ignores errors when its frame is deleted

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

From: Philipp <p.stephani2 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; Emacsclient ignores errors when its frame is deleted
Date: Mon, 17 Dec 2018 22:52:00 +0100

Assuming an Emacs server is running:

$ emacsclient --create-frame --eval '(unwind-protect (error "foo") (delete-frame))' ; echo $?
0

This means that if the frame created by Emacsclient is deleted, errors
are ignored.  This seems like a bug; I wouldn't expect errors to be
ignored in this case, because they should bubble up through the
`unwind-protect' form.


In GNU Emacs 27.0.50 (build 70, x86_64-pc-linux-gnu, GTK+ Version 3.22.24)
 of 2018-12-17
Repository revision: 55838e4e6a176317367c6759e0520395e80c856f
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --enable-gtk-deprecation-warnings
 --enable-gcc-warnings=warn-only --with-modules --without-pop
 --with-mailutils --enable-checking --enable-check-lisp-object-type
 'CFLAGS=-O0 -ggdb3''

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY GNUTLS
FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS
JSON GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs
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seq byte-opt gv bytecomp byte-compile cconv dbus xml cl-loaddefs cl-lib
elec-pair mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 109268 7603)
 (symbols 48 21807 1)
 (strings 32 32891 1767)
 (string-bytes 1 890386)
 (vectors 16 16545)
 (vector-slots 8 535263 7864)
 (floats 8 51 66)
 (intervals 56 224 0)
 (buffers 992 12))

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Message #8 received at 33782 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Philipp <p.stephani2 <at> gmail.com>
Cc: 33782 <at> debbugs.gnu.org
Subject: Re: bug#33782: 27.0.50;
 Emacsclient ignores errors when its frame is deleted
Date: Wed, 10 Jul 2019 01:32:58 +0200

Philipp <p.stephani2 <at> gmail.com> writes:

> Assuming an Emacs server is running:
>
> $ emacsclient --create-frame --eval '(unwind-protect (error "foo") (delete-frame))' ; echo $?
> 0
>
> This means that if the frame created by Emacsclient is deleted, errors
> are ignored.  This seems like a bug; I wouldn't expect errors to be
> ignored in this case, because they should bubble up through the
> `unwind-protect' form.

Well...  like

(unwind-protect (error "foo") (message "zot"))

there's no error bubbling, and there's no error to be returned, so I
think this is correct behaviour?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #15 received at 33782 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Philipp <p.stephani2 <at> gmail.com>, 33782 <at> debbugs.gnu.org
Subject: Re: bug#33782: 27.0.50;
 Emacsclient ignores errors when its frame is deleted
Date: Tue, 09 Jul 2019 22:05:36 -0400

reopen 33782
tags 33782 - notabug
quit

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Philipp <p.stephani2 <at> gmail.com> writes:
>
>> Assuming an Emacs server is running:
>>
>> $ emacsclient --create-frame --eval '(unwind-protect (error "foo") (delete-frame))' ; echo $?
>> 0
>>
>> This means that if the frame created by Emacsclient is deleted, errors
>> are ignored.  This seems like a bug; I wouldn't expect errors to be
>> ignored in this case, because they should bubble up through the
>> `unwind-protect' form.
>
> Well...  like
>
> (unwind-protect (error "foo") (message "zot"))
>
> there's no error bubbling, and there's no error to be returned, so I
> think this is correct behaviour?

No, that's incorrect, unwind-protect doesn't catch errors, it just
executes the handler forms (in this case (message "zot")) before the
error finishes bubbling.

Message #22 received at 33782 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: Philipp <p.stephani2 <at> gmail.com>, 33782 <at> debbugs.gnu.org
Subject: Re: bug#33782: 27.0.50;
 Emacsclient ignores errors when its frame is deleted
Date: Wed, 10 Jul 2019 13:16:08 +0200

Noam Postavsky <npostavs <at> gmail.com> writes:

>>> $ emacsclient --create-frame --eval '(unwind-protect (error "foo")
>>> (delete-frame))' ; echo $?
>>> 0
>>>
>>> This means that if the frame created by Emacsclient is deleted, errors
>>> are ignored.  This seems like a bug; I wouldn't expect errors to be
>>> ignored in this case, because they should bubble up through the
>>> `unwind-protect' form.

[...]

> No, that's incorrect, unwind-protect doesn't catch errors, it just
> executes the handler forms (in this case (message "zot")) before the
> error finishes bubbling.

Yes, but there is no...  bubbling...  in this context.  The code is the
moral equivalent of saying

emacs -Q -nw --eval '(unwind-protect (error "foo") (kill-emacs))'; echo $?

in an emacsclient context, and this which also says "0".

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #25 received at 33782 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Philipp <p.stephani2 <at> gmail.com>, 33782 <at> debbugs.gnu.org
Subject: Re: bug#33782: 27.0.50;
 Emacsclient ignores errors when its frame is deleted
Date: Wed, 10 Jul 2019 10:34:45 -0400

tags 33782 notabug
close 33782
quit

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

>>>> $ emacsclient --create-frame --eval '(unwind-protect (error "foo")
>>>> (delete-frame))' ; echo $?
>>>> 0

> Yes, but there is no...  bubbling...  in this context.  The code is the
> moral equivalent of saying
>
> emacs -Q -nw --eval '(unwind-protect (error "foo") (kill-emacs))'; echo $?
>
> in an emacsclient context, and this which also says "0".

Oh, I see, for emacsclient --create-frame, delete-frame is like
kill-emacs.  I guess that makes sense then.  Re-closing.

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