Subject: bug#19897: closed (Re: bug#19897: 24.3; Emacs exits with exit code 0 if EOF of stdin has been reached)

From: [email-masked] (GNU bug Tracking System)
Date: Wed, 18 Feb 2015 21:17:02 +0000

Your bug report

#19897: 24.3; Emacs exits with exit code 0 if EOF of stdin has been reached

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 [email-masked].

-- 
19897: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19897
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#19897: 24.3; Emacs exits with exit code 0 if EOF of stdin has been reached
From: Eli Zaretskii <[email-masked]>
To: Philipp Stephani <[email-masked]>
Cc: [email-masked]
Date: Wed, 18 Feb 2015 23:16:40 +0200
List-Id: <debbugs-submit.debbugs.gnu.org>

> From: Philipp Stephani <[email-masked]>
> Date: Wed, 18 Feb 2015 21:58:42 +0100
> 
> This has been discussed in
> https://lists.gnu.org/archive/html/help-gnu-emacs/2015-02/msg00381.html.
> 
> To reproduce:
> 
> $ emacs -Q -batch -eval '(error "foo")' < /dev/null ; echo $?
> foo
> 255
> 
> $ emacs -Q -batch -eval '(kill-emacs 37)' < /dev/null ; echo $?
> 37
> 
> $ emacs -Q -batch -eval '(progn (ignore-errors (read)) (kill-emacs 37))' <<< nil ; echo $?
> Lisp expression: 37
> 
> $ emacs -Q -batch -eval '(read)' < /dev/null ; echo $?
> Lisp expression: Error reading from stdin
> 0
> 
> $ emacs -Q -batch -eval '(progn (ignore-errors (read)) (kill-emacs 37))' < /dev/null ; echo $?
> Lisp expression: 0
> 
> The examples with nonzero exit code are as expected.  The examples with
> zero exit code are unexpected.  They are caused by the code 
> 
>   if (feof (stdin))
>     arg = Qt;
> 
> in Fkill_emacs.  This behavior confuses e.g. unit tests runners that
> rely on a precise exit code.
> It is not documented in the documentation for kill-emacs.

Fixed in commit 7932d06 on master branch.

Subject: 24.3; Emacs exits with exit code 0 if EOF of stdin has been reached
From: Philipp Stephani <[email-masked]>
To: [email-masked]
Date: Wed, 18 Feb 2015 21:58:42 +0100
List-Id: <debbugs-submit.debbugs.gnu.org>

This has been discussed in
https://lists.gnu.org/archive/html/help-gnu-emacs/2015-02/msg00381.html.

To reproduce:

$ emacs -Q -batch -eval '(error "foo")' < /dev/null ; echo $?
foo
255

$ emacs -Q -batch -eval '(kill-emacs 37)' < /dev/null ; echo $?
37

$ emacs -Q -batch -eval '(progn (ignore-errors (read)) (kill-emacs 37))' <<< nil ; echo $?
Lisp expression: 37

$ emacs -Q -batch -eval '(read)' < /dev/null ; echo $?
Lisp expression: Error reading from stdin
0

$ emacs -Q -batch -eval '(progn (ignore-errors (read)) (kill-emacs 37))' < /dev/null ; echo $?
Lisp expression: 0

The examples with nonzero exit code are as expected.  The examples with
zero exit code are unexpected.  They are caused by the code 

  if (feof (stdin))
    arg = Qt;

in Fkill_emacs.  This behavior confuses e.g. unit tests runners that
rely on a precise exit code.
It is not documented in the documentation for kill-emacs.

In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.7)
 of 2014-03-07 on lamiak, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-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

Recent input:
<help-echo> M-x r e p o r t - e m <tab> <return>

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

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils time-date tooltip ediff-hook vc-hooks
lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)