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Date:	Mon, 11 Mar 2019 10:45:03 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	Mark Geisert <mark AT maxrnd DOT com>
Cc:	cygwin AT cygwin DOT com
Subject:	Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
Message-ID:	<20190311094503.GC3785@calimero.vinschen.de>
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On Mar 11 00:21, Mark Geisert wrote:
> Tatsuro MATSUOKA wrote:
> > [...]
> > without the above patch ()
> > qt_safe_socket(PF_UNIX, SOCK_STREAM, 0, O_NONBLOCK)))
> > gnuplot cannot connect with gnuplot_qt.
> >=20
> > with the above patch ()
> > qt_safe_socket(PF_UNIX, SOCK_STREAM, 0))
> > gnuplot can connect with gnuplot_qt.
> >=20
> > Perhaps qt with O_NONBLOCK is some wrong with process connection.
>=20
> Hi Tatsuro,
> For the record, what Enrico supplied is what we'd call an STC, a Simple T=
est
> Case.  Unfortunately his STC dealt with select() on a named pipe.
>=20
> Your gnuplot issue has to do with "Unix sockets", a form of IPC between
> processes.  Cygwin uses Windows named pipes to implement "Unix sockets" on
> Windows.

No, wait!  While there is code in Cygwin which is supposed to use
Windows named pipes to implement AF_UNIX sockets at one point, thos
code is far from being complete.

As yet, Cygwin uses loopback IPv4 sockets to implement AF_UNIX sockets.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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