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bug#4944: 23.1.50; starting a server without forking a daemon


From: Kenny Stuart
Subject: bug#4944: 23.1.50; starting a server without forking a daemon
Date: Tue, 17 Nov 2009 14:25:34 +0000

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug.  If you can, give
a recipe starting from `emacs -Q':

This is a feature request to add the facility to start an emacs server
using a command-line option that runs as a foreground process instead
of forking a daemon and exiting.

Motivation:

Forking a daemon then exiting the main process is incompatible with
systems that manage processes as services, such as launchd on OS X,
therefore it is not possible to create an effective launchd service
using emacs in daemon mode.

Possible Solution:

For review I have included a patch that adds a --server command line
option that does what the --daemon option does, except it runs the
server in the foreground process rather than forking a daemon and
exiting.

Please note that I am new to emacs and nix based operating systems and
in the short time I have had to spend on this was unable to add a SIGINT
handler to gracefully shutdown the emacs server, not that it matters
to launchd since it should send SIGTERM, but a solution would be nice.

There appear to be issues on OS X with creating a new frame using the -c option
to emacsclient as emacs crashes (so far during garbage collection) when
doing this, however I am still learning the dev tools available to me on this
platform and it will be a while before I could effectively report such bugs, so
this is just an FYI. 

As I'm using a debug build so I can investigate further, can you confirm
that the build configure options I've used are ok and not likely to be
contributing to the instability, are there any other options I should be
using?

Please also note that this is the first time I have engaged with an open
source project so if I'm not doing it right let me know.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/Applications/Emacs.app/Contents/Resources/etc/DEBUG.


In GNU Emacs 23.1.50.2 (x86_64-apple-darwin10.2.0, NS apple-appkit-1038.25)
 of 2009-11-17 on maverick.home
Windowing system distributor `Apple', version 10.3.1038
configured using `configure  '--with-ns' '--enable-asserts' 'CFLAGS=-O0 -gdwarf-2 -g3 -Wno-pointer-sign''

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: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Text

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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<backspace> <backspace> L i b r a r y / L a u n c h 
A g e n t s / <help-echo> o r g . g n u . e n <backspace> 
m a c s - s e r v e r . p l i s t <return> <help-echo> 
t e x t / x m l <return> ~ / L i b r a r y / L a u 
n c h A g e n t s SPC s c r i p t SPC o r <backspace> 
<backspace> f o r SPC e m a c s SPC s e r v e r <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> <left> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> p l s i t <backspace> <backspace> <backspace> 
i s t <return> a t t a c h m e n t <return> <backspace> 
<help-echo> <menu-bar> <file> <write-file> <help-echo> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> D o <tab> c <tab> e m a c s 
- m a i l . t x t <return> <down-mouse-1> <mouse-1> 
<wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> 
<triple-wheel-up> <triple-wheel-up> <wheel-down> <double-wheel-down> 
<wheel-down> <double-wheel-down> <wheel-down> <double-wheel-down> 
<triple-wheel-down> <triple-wheel-down> <triple-wheel-down> 
<wheel-down> <double-wheel-down> <triple-wheel-down> 
<triple-wheel-down> <wheel-up> <double-wheel-up> <triple-wheel-up> 
<triple-wheel-up> <triple-wheel-up> <wheel-up> <double-wheel-up> 
<triple-wheel-up> <triple-wheel-up> <triple-wheel-up> 
<triple-wheel-up> <wheel-up> <double-wheel-up> <wheel-down> 
<double-wheel-down> <triple-wheel-down> <triple-wheel-down> 
<wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> 
<triple-wheel-up> <wheel-up> <wheel-up> <wheel-up> 
<down-mouse-1> <mouse-movement> <mouse-movement> <help-echo> 
<mouse-movement> <help-echo> <mouse-movement> <mouse-movement> 
<mouse-movement> <help-echo> <mouse-movement> <mouse-movement> 
<drag-mouse-1> <menu-bar> <edit> <copy> <down-mouse-1> 
<down-mouse-1> <down-mouse-1> <down-mouse-1> <down-mouse-1> 
<down-mouse-1> <down-mouse-1> <down-mouse-1> <down-mouse-1> 
<down-mouse-1> <down-mouse-1> <down-mouse-1> <down-mouse-1> 
<down-mouse-1> <down-mouse-1> <down-mouse-1> <down-mouse-1> 
<down-mouse-1> M-x r e p o r t - e m a c s - b u g 
<return>

Recent messages:
Auto-saving...done
Undo!
Auto-saving...done
Making completion list...
Saving file /Users/kstuart/Documents/emacs-mail.txt...
Wrote /Users/kstuart/Documents/emacs-mail.txt
byte-code: Beginning of buffer [2 times]
byte-code: End of buffer [2 times]
byte-code: Beginning of buffer [8 times]
Saved text from "Please write in English if possible, bec"

Load-path shadows:
/Applications/Emacs.app/Contents/Resources/lisp/emacs-lisp/lucid hides /Applications/Emacs.app/Contents/Resources/lisp/obsolete/lucid
/Applications/Emacs.app/Contents/Resources/lisp/emacs-lisp/levents hides /Applications/Emacs.app/Contents/Resources/lisp/obsolete/levents

Features:
(ispell newcomment help-mode view shadow mail-extr message ecomplete
rfc822 mml mml-sec password-cache mm-decode mm-bodies mm-encode mailcap
mail-parse rfc2231 rfc2047 rfc2045 qp ietf-drums mailabbrev nnheader
gnus-util netrc time-date mm-util mail-prsvr gmm-utils wid-edit
mailheader canlock sha1 hex-util hashcash mail-utils emacsbug sendmail
regexp-opt server tooltip ediff-hook vc-hooks lisp-float-type mwheel
ns-win easymenu tool-bar dnd fontset image fringe lisp-mode register
page menu-bar rfn-eshadow timer select scroll-bar mldrag 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 loaddefs button
minibuffer faces cus-face text-properties overlay md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process ns multi-tty emacs)


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