GNU bug report logs - #3608
BG processes killed by start-process

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 3608 in the body.
You can then email your comments to 3608 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: JD Smith <jdtsmith <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: BG processes killed by start-process
Date: Thu, 18 Jun 2009 14:03:41 -0400

Start-process seems to kill off child processes of which have been put  
into the background.

Create a small shell script "bgtest":

#!/bin/sh
sleep 121 &
exit 0

and now

(start-process "BGTEST" nil "bgtest")

Notice that the sleep process has been killed, rather than waited on.

Is this the intended behavior?  Any thoughts for preventing it (other  
than modifying the script, which I don't control)?

Thanks.



----------------


In GNU Emacs 22.3.1 (i386-apple-darwin9.6.0, Motif Version 2.3.1)
 of 2009-04-29 on terrapin
Windowing system distributor `The X.Org Foundation', version  
11.0.10402000
configured using `configure  '--prefix=/opt/local' '--without-carbon'  
'--with-xpm' '--with-jpeg' '--with-tiff' '--with-gif' '--with-png' '-- 
with-x-toolkit=motif' 'CC=/usr/bin/gcc-4.0' 'CFLAGS=-O2' 'LDFLAGS=-L/ 
opt/local/lib' 'CPPFLAGS=-I/opt/local/include' 'CPP=/usr/bin/cpp-4.0''

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_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Shell-script

Minor modes in effect:
  TeX-source-specials-mode: t
  which-function-mode: t
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: identity

Recent input:
<backspace> <backspace> <backspace> <backspace> <backspace>
/ h o m e / j d s m i t h / b i n / b g t e s t " )
<return> <down-mouse-1> <mouse-1> M-: <up> <help-echo>
<down-mouse-3> <mouse-3> <down-mouse-1> <mouse-movement>
<mouse-movement> <drag-mouse-1> <switch-frame> <down-mouse-1>
<mouse-movement> <mouse-1> C-x C-f C-g C-x C-f <M-backspace>
<M-backspace> b i n / b g <tab> t <tab> e <tab> C-x
C-f C-a <right> <right> C-k b i n / t e <tab> <return>
<down> <down> <down> <down> <up> <down> <return> <up>
d i s o w n SPC $ $ C-x C-s M-: <up> <return> <down-mouse-1>
<mouse-1> <backspace> <backspace> % % C-x C-s <down-mouse-1>
<mouse-1> M-: <up> <return> <down-mouse-1> <mouse-1>
<up> C-a C-k C-k C-x C-s <down-mouse-1> <mouse-1> <backspace>
C-x C-s M-: <up> <return> <down-mouse-1> <mouse-1>
M-: <up> C-e <left> <left> <left> <left> <left> <left>
<left> <left> <left> <right> <right> <right> <backspace>
<backspace> <right> <right> <right> <right> b g <return>
<down-mouse-1> <mouse-movement> <mouse-1> M-: <up>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <return> <down-mouse-1> <mouse-1> M-: <up>
<right> <right> <right> C-h f d <return> C-g C-h f
<return> <right> <down> <up> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> <right> <right> <right> <right> <right> <right>
<right> M-d M-d M-d C-d C-e <return> <switch-frame>
<switch-frame> <down-mouse-1> <mouse-movement> <mouse-1>
M-x p r o c <tab> C-h a p r o c e s s <return> M-x
l i s t - p r <tab> <return> <help-echo> <help-echo>
<down-mouse-1> <mouse-1> M-x e m a c s - C-a C-k r
e p <tab> o <tab> r <tab> <return>

Recent messages:
#<process BGTEST> [3 times]
Making completion list...
Quit
Type C-x 1 to remove help window.
#<process BGTEST>
Quit
Loading apropos...done
Type C-x 1 to remove help window.
Making completion list... [2 times]
Loading emacsbug...done


--
 J.D. Smith                  <==> http://tir.astro.utoledo.edu/jdsmith
 Ritter Observatory, MS 113  <==> 419-530-8528 <W>
 University of Toledo        <==> 419-530-5167 <F>
 Toledo, OH 43606            <==>

Message #8 received at 3608 <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: JD Smith <jdtsmith <at> gmail.com>
Cc: 3608 <at> debbugs.gnu.org
Subject: Re: BG processes killed by start-process
Date: Sat, 17 Sep 2011 08:10:59 +0200

JD Smith <jdtsmith <at> gmail.com> writes:

> Start-process seems to kill off child processes of which have been put
> into the background.
>
> Create a small shell script "bgtest":
>
> #!/bin/sh
> sleep 121 &
> exit 0
>
> and now
>
> (start-process "BGTEST" nil "bgtest")
>
> Notice that the sleep process has been killed, rather than waited on.
>
> Is this the intended behavior?  Any thoughts for preventing it (other
> than modifying the script, which I don't control)?

I'm unable to reproduce this bug in Emacs 24:

(setq a (start-process "BGTEST" nil "/tmp/bgtest"))
=> #<process BGTEST>
(process-status a)
=> exit

Do you still see this bug in a current Emacs?

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

Message #13 received at 3608-done <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: JD Smith <jdtsmith <at> gmail.com>
Cc: 3608-done <at> debbugs.gnu.org
Subject: Re: bug#3608: BG processes killed by start-process
Date: Sat, 17 Sep 2011 08:58:18 +0200

JD Smith <jdtsmith <at> gmail.com> writes:

> Start-process seems to kill off child processes of which have been put
> into the background.
>
> Create a small shell script "bgtest":
>
> #!/bin/sh
> sleep 121 &
> exit 0
>
> and now
>
> (start-process "BGTEST" nil "bgtest")
>
> Notice that the sleep process has been killed, rather than waited on.

That's not a bug.  The session created for the process is closed when
the process exits, which causes the kernel to send SIGHUP to all
remaining processes in the session.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.