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From: Filipp Gunbin <fgunbin AT fastmail DOT fm>
To: cygwin AT cygwin DOT com
Subject: Re: emacs 24.3.1: output from async-shell-command is not always displayed
References: <86zjhbpf9b DOT fsf AT w2139spb DOT ru DOT yotateam DOT com>	<53A0EF03 DOT 8060001 AT cornell DOT edu>	<86lhsupj6c DOT fsf AT w2139spb DOT ru DOT yotateam DOT com>	<f5b4mzigx07 DOT fsf AT troutbeck DOT inf DOT ed DOT ac DOT uk>
Date: Wed, 18 Jun 2014 19:23:35 +0400
In-Reply-To: <f5b4mzigx07.fsf@troutbeck.inf.ed.ac.uk> (Henry S. Thompson's	message of "Wed, 18 Jun 2014 14:36:40 +0100")
Message-ID: <86ha3i6y2w.fsf@w2139spb.ru.yotateam.com>
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On 18/06/2014 17:36 +0400, Henry S. Thompson wrote:

> Filipp Gunbin writes:
>
>> When I call such a script (catalina.sh, for example), its output is
>> displayed in *Asynchronous Shell Command*, but the program starting from
>> it with & (java usually) is not started (or started and killed
>> immediately).  I supposed that maybe it's killed when the parent process
>> finishes.  From looking at lisp code of async-shell-command I can't see
>> anything which differs from shell-command in this way.  I tried to
>> narrow the problem and got the case I've posted here initially, but now
>> I think those could be different problems.
>
> This sounds very much like it _may_ be the same problem as discussed
> (at inconclusive length, sorry!) wrt xemacs in this thread:
>
>   http://lists.xemacs.org/pipermail/xemacs-beta/2014-January/024736.html
>
> I've burned a lot of midnight oil on that one, with no real joy as
> yet.
>
> At the very least it does seem like there was some change in
> Cygwin pty/signal area some time back which affects the way emacsen
> try to communicate with sub-processes. . .

Thanks Henry,

I've tried the earliest snapshot on cygwin.com (2013-12-01) and it
behaves the same.

One of my scripts (catalina.sh from Tomcat) works fine, but another
(ActiveMQ) does not.  The difference between them is that catalina.sh
just runs `java ... &' and activemq runs `sh -c "java ... &"'.  When I
remove "sh -c" part it also works fine!

So I've modified my test case as follows:

echo 'sh -c "touch /tmp/test/${RANDOM}.txt &"' > /tmp/1.sh

Now, `M-x async-shell-command /tmp/1.sh' sometimes produces new file in
/tmp/test and sometimes not!  Strangely, if invoked multiple times, it
gives success-fail-success-fail-...  Running just "/tmp/1.sh &" from
terminal always produces new file.

Filipp

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