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Date: Thu, 1 Aug 2019 18:04:40 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Regression (last snapshot)
Message-ID: <20190801160440.GC11632@calimero.vinschen.de>
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On Aug  1 10:38, Eric Blake wrote:
> On 8/1/19 10:30 AM, Ken Brown wrote:
>=20
> >>> OK, when xwin-xdg-menu launches an application, it creates two pipes=
=20
> >>> and sets
> >>> the application's stdout and stderr to the write ends of those pipes.=
=20=20
>=20
> > Well, I can't be sure that the pipes are responsible.  It's just that=
=20
> > the existence of the pipes is the only difference I could spot between=
=20
> > an ordinary terminal and a terminal started from xwin-xdg-menu.
> >=20
> > Is it possible that the logging somehow slows things down or changes th=
e=20
> > buffering, so that the grep process takes longer to complete?  This=20
> > would be consistent with my theory that the broken pipe error doesn't=
=20
> > really represent a bug, but rather it reflects the fact that ls exits=
=20
> > before grep has finished writing.
>=20
> 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.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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