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sit-for + </dev/zero = SIGHUP

From: Alexandre Duret-Lutz
Subject: sit-for + </dev/zero = SIGHUP
Date: Sun, 15 Jun 2003 01:28:03 +0200

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.3.2 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2003-04-24 on raven, modified by Debian
configured using `configure  i386-linux --prefix=/usr --sharedstatedir=/var/lib 
--libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info 
--mandir=/usr/share/man --with-pop=yes --with-x=yes --with-x-toolkit=athena 
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: C
  locale-coding-system: nil
  default-enable-multibyte-characters: nil

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hi People,

The following command causes Emacs to die on a SIGHUP.

% emacs -batch -q -no-site-file -eval '(sit-for 1)' </dev/null    
zsh: hangup     emacs --batch -q -no-site-file -eval '(sit-for 1)' < /dev/null

I would expect --batch to work when stdin is empty or closed, but
since sit-for is used in many places in Emacs that is obviously not
the case.

[ FWIW, the above issue can cause a configure test (AM_PATH_LISPDIR)
from Automake to fail.  This test runs the following command to list
all the load paths of Emacs, and will SIGHUP if one of the site
el-files calls sit-for.

% emacs -batch -q -eval '(while load-path (princ (concat (car load-path)
"\n")) (setq load-path (cdr load-path)))' </dev/null
No /etc/mailname. Reverting to default...
zsh: hangup     emacs -batch -q -eval  < /dev/null

The rational for using </dev/null here is that people have run across
flavors of emacs that do not honor any option and would otherwise
start in interactive mode (requiring users to type C-x C-c to continue
the ./configure script!). ]

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