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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Regression (last snapshot)
Date: Thu, 1 Aug 2019 21:17:44 +0000
Message-ID: <19e73527-cb9a-a106-a57a-2895b8a520c9@cornell.edu>
References: <20190729134700 DOT GO11632 AT calimero DOT vinschen DOT de> <ced2750a-0a52-1396-b6c1-f4228116bde7 AT cornell DOT edu> <20190729152327 DOT GQ11632 AT calimero DOT vinschen DOT de> <20190729154049 DOT GR11632 AT calimero DOT vinschen DOT de> <c5d01965-80b9-cece-54d2-f7462f84c0a2 AT cornell DOT edu> <8e57d4da-722d-1b9a-bd28-5f96ed182f6a AT cornell DOT edu> <0a09679b-1a0f-613b-04c8-1a63da8a00c2 AT cornell DOT edu> <33aead20-540c-ee3b-0d38-ff053fbac040 AT dronecode DOT org DOT uk> <12269538-c387-1f1e-ab5a-b36b60d09937 AT cornell DOT edu> <a61264b5-80da-52fc-7093-8e8d9a8ace33 AT redhat DOT com> <20190801160440 DOT GC11632 AT calimero DOT vinschen DOT de>
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On 8/1/2019 12:04 PM, Corinna Vinschen wrote:
> On Aug  1 10:38, Eric Blake wrote:
>> On 8/1/19 10:30 AM, Ken Brown wrote:
>>
>>>>> OK, when xwin-xdg-menu launches an application, it creates two pipes
>>>>> and sets
>>>>> the application's stdout and stderr to the write ends of those pipes.
>>
>>> Well, I can't be sure that the pipes are responsible.  It's just that
>>> the existence of the pipes is the only difference I could spot between
>>> an ordinary terminal and a terminal started from xwin-xdg-menu.
>>>
>>> Is it possible that the logging somehow slows things down or changes the
>>> buffering, so that the grep process takes longer to complete?  This
>>> would be consistent with my theory that the broken pipe error doesn't
>>> really represent a bug, but rather it reflects the fact that ls exits
>>> before grep has finished writing.
>>
>> Could it be a case of xwin-xdg-menu calling signal(SIGPIPE, SIG_IGN) or
>> similar, and accidentally letting grep inherit the ignored SIGPIPE?
> 
> execve doesn't propagate the signal dispositions, they get reset to
> default.

I just realized, as a result of Eric's comment, that the explanation 
I've been pushing is nonsense.

What I've been explaining is why there would be a broken pipe, and 
therefore a SIGPIPE and EPIPE.  But I now see that that's not the issue. 
  The issue is whether grep gets the SIGPIPE and terminates before it 
has a chance to see the EPIPE.

So if grep isn't ignoring SIGPIPE, the only other possibility I can 
think of is that grep isn't receiving SIGPIPE, or at least that there's 
a delay before it receives it.  Why would that happen only in terminals 
started by xwin-xdg-menu?

Ken

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