X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-1.4 required=5.0 	tests=AWL,BAYES_00,SPF_PASS
X-Spam-Check-By: sourceware.org
Message-ID: <4A40B8C4.4010203@gmx.de>
Date: Tue, 23 Jun 2009 13:13:08 +0200
From: Matthias Andree <matthias DOT andree AT gmx DOT de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1.21) Gecko/20090302 Thunderbird/2.0.0.21 Mnenhy/0.7.6.666
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: How to avoid having shell scripts which fail from killing Emacs    shell?
References: <41FCBA4373FF4228897280824F4627CF AT corp DOT real DOT com> <4A3FDACE DOT 3060402 AT cornell DOT edu> <FB3A080CD486460B81572A5449F34297 AT corp DOT real DOT com> <4A3FE157 DOT 9080901 AT cornell DOT edu> <79EE5DFDC3DC45F2821CD2441A8A63C5 AT corp DOT real DOT com>
In-Reply-To: <79EE5DFDC3DC45F2821CD2441A8A63C5@corp.real.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

David Karr schrieb:
>> -----Original Message-----
>> From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On Behalf
>> Of Ken Brown
>> Sent: Monday, June 22, 2009 12:54 PM
>> To: cygwin AT cygwin DOT com
>> Subject: Re: How to avoid having shell scripts which fail from killing
>> Emacs shell?
>>
>> On 6/22/2009 3:38 PM, David Karr wrote:
>>>> -----Original Message-----
>>>> From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On
>> Behalf
>>>> Of Ken Brown
>>>> Sent: Monday, June 22, 2009 12:26 PM
>>>> On 6/22/2009 10:53 AM, David Karr wrote:
>>>>> I've often been annoyed by shell scripts which fail for particular
>>>>> reasons, at which point it causes my Emacs shell buffer to get killed,
>>>>> with "Process shell<2> finished".
>>>> I don't recall ever seeing this happen, but maybe I just don't
>> remember.
>>>>   Can you give me a simple test case?
>>> I'm not sure how complicated it needs to be.  My test case gathers a
>> couple
>>> of parameters and then calls a Java (JDK 1.6.0_14) class.  The class
>> throws
>>> an exception (file not found) in my test case (because I'm deliberately
>>> giving it parameters that will cause that).  If I give it parameters
>> that
>>> will avoid the exception, then it doesn't kill the shell.
>>>
>>> Is that enough information to build a test case with?
>> No.  I don't have JDK installed, and I don't have any idea how it
>> interacts with cygwin processes.  If you can trigger the problem with a
>> simple shell script that doesn't require JDK, I'll see if I can help.
>> Or maybe someone on the list who does have JDK can suggest something for
>> you to try.
> 
> I was able to produce an additional clue by writing a custom class for
> testing this.
> 
> I found that the key is whether the Java class reads from stdin or not.  I
> built a first version that takes a filepath on the command line, and whether
> I get the class to throw an exception or not, it exits the script without
> killing the shell.  However, when I changed the class to also read a line of
> input from stdin, whether the filepath on the command line exists or not
> (i.e., whether the class throws an exception or not), it kills the shell at
> completion of the script.
> 
> So, it has something to do with whether the sub-shell reads stdin or not.  I
> have no idea what that indicates, but I'm sure that must be useful
> information.

Just a few pointers:

Does the problem go away if the java command is enclosed in parentheses, so as
to run it in a sub-shell?

Are you using (perhaps in the emacs configuration somewhere) shell options like
"-e" for the /outer/ shell?

Are you sourcing (". scriptname") rather than executing ("scriptname") your scripts?


HTH

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple