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From: Eric Blake <eblake AT redhat DOT com>
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Subject: Re: Regression (last snapshot)
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On 8/1/19 10:30 AM, Ken Brown wrote:

>>> 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

> 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 the=
=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.

Could it be a case of xwin-xdg-menu calling signal(SIGPIPE, SIG_IGN) or
similar, and accidentally letting grep inherit the ignored SIGPIPE?
When SIGPIPE is not ignored, grep's failure to write to a pipe causes
termination before the failed write completes; but when it is ignored,
grep sees EPIPE from the failed write and reports that.

--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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