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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>
Date: Wed, 18 Jun 2014 15:10:35 +0400
In-Reply-To: <53A0EF03.8060001@cornell.edu> (Ken Brown's message of "Tue, 17	Jun 2014 21:44:35 -0400")
Message-ID: <86lhsupj6c.fsf@w2139spb.ru.yotateam.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (cygwin)
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On 18/06/2014 05:44 +0400, Ken Brown wrote:

> On 6/17/2014 2:22 PM, Filipp Gunbin wrote:
>> Here are the steps to reproduce.
>>
>> M-& echo "sleep 1; ps &" > /tmp/1.sh
>>
>> Then M-& /tmp/1.sh (few times).
>>
>> On my machine, sometimes it gives the output in the *Async Shell
>> Command* buffer, sometimes not.  Without "sleep 1" the output is
>> displayed almost always.
>>
>> M-! /tmp/1.sh displays the output always.
>
> I'm seeing something different, but I'm running a pretest of
> emacs-24.4 rather than emacs-24.3.  I find that the output is never
> displayed, with or without "sleep 1".  But if I remove the "&" from
> 1.sh, then the output is always displayed (again, with or without
> "sleep 1").  Could you try installing the test release emacs-24.3.90-1
> and see if you get the same results I'm getting?

I've tried on bzr emacs-24.4.50.1 and what I get is exactly the same as
on emacs-24.3.

> I don't know if there's a bug here or not.  If there is, it's not
> specific to Cygwin; I get the same behavior on Fedora 20.
>
> Do you have a use case for wanting to call asynchronously a command
> that's already running asynchronously (because of the "&")?

Yes, I usually call asynchronously various startup scripts (Tomcat,
ActiveMQ and other).  They usually produce some output and start java in
background with &.  It works from the terminal, but not from emacs.
Actually, some time ago it worked from emacs too (I didn't work for some
months, so unfortunately I can't tell exactly when it started).

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.

Anyway, thanks for looking at this.

Filipp

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