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Date: Sun, 02 Oct 2011 17:35:01 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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To: cygwin AT cygwin DOT com
Subject: Re: error while running shell in emacs
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On 9/30/2011 3:04 PM, Ken Brown wrote:
> On 9/30/2011 10:27 AM, Markus Hoenicka wrote:
>> Hi,
>>
>> after moving to a new position I have set up a fresh Cygwin installation:
>>
>> CYGWIN_NT-5.1 sbhc123 1.7.9(0.237/5/3) 2011-03-29 10:10 i686 Cygwin
>>
>> I use some Emacs extensions which execute external programs using
>> (call-process). This used to work on my previous setup, but it fails on
>> my current box. The following command run in Emacs reproduces what seems
>> to be the problem:
>>
>> (call-process "bash" nil '(t t) nil "-ic" "ls -al")
>> bash: Kann die Prozessgruppe des Terminals nicht setzen (-1).:
>> Inappropriate ioctl for device
>> bash: Keine Job Steuerung in dieser Shell.
>>
>> As you can see, my Cygwin also started speaking German, but I didn't get
>> round to fix that yet. The messages loosely translate to: "cannot set
>> terminal process group" and "no job control in this shell".
>>
>> Is this an incorrect setup of either Cygwin or Emacs, or is this indeed
>> a problem that crept into Cygwin recently?
>
> I can reproduce this problem. It reminds me of a problem that I reported in
>
> http://cygwin.com/ml/cygwin/2011-06/msg00174.html ,
>
> but that started with the 2011-05-05 snapshot and was fixed in the
> 2011-06-16 snapshot. The problem you're reporting exists in Cygwin 1.7.9
> and persists in the latest snapshot, but with different symptoms:
> Instead of printing error messages, emacs hangs and has to be killed.
>
> If one of the Cygwin developers wants to look at this, here are the
> steps to reproduce it:
>
> 1. Start emacs.
> 2. Type <Ctrl-x>b<Enter>
>
> [This should put you in the *scratch* buffer.]
>
> 3. Type (or copy and paste) the following text into the *scratch* buffer:
>
> (call-process "bash" nil '(t t) nil "-ic" "ls -al")
>
> 4. With the cursor positioned immediately after the closing parenthesis,
> type <Ctrl-j>

FWIW, the change in behavior (i.e., emacs hanging instead of giving an 
error message) starts with the 2006-06-13 snapshot.  And it may be 
misleading to say that emacs hangs.  What happens is that it becomes 
unresponsive to key stokes (presumably it's waiting).  If I go to 
another window and run ps, the bash process shows up with an "S" at the 
left.  If I kill that process, emacs behaves normally again.

Ken


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