From: Tatsuro MATSUOKA <tmacchant2@yahoo.co.jp>
To: Achim Gratz <Stromeko@nexgo.de>, <cygwin@cygwin.com>
Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
Date: Tue, 05 Mar 2019 23:58:00 -0000 [thread overview]
Message-ID: <765948088.2262341.1551830305348.JavaMail.yahoo@mail.yahoo.co.jp> (raw)
In-Reply-To: <87d0n586qw.fsf@Rainer.invalid>
> From: Achim Gratz
> To: cygwin
> Cc:
> Date: 2019/3/6, Wed 04:24
> Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
>
>T atsuro MATSUOKA writes:
>> I contacted with Enrico who tells me the patch that I have shown.
>
> Yes, but that monkeys around the real problem. What Yaakov is telling
> you is that there are two options and we don't know yet which one we
> have to deal with.
>
> If O_NONBLOCK is needed, but does not work correctly under Cygwin, then
> that's a bug in Cygwin. For this case, Corinna asks you to create an
> STC that demonstrates the bug so it can be triaged without having to
> work with something as complex as the Qt terminal in Cygwin.
>
> If on the other hand O_NONBLOCK is in fact not needed and just shows
> different behaviour on different systems without a bug in the
> implementation being present, then upstream should remove that argument.
>
>
> Regards,
> Achim.
Here I desribe another discussion on Bug tracker on gnuplot
https://sourceforge.net/p/gnuplot/bugs/2147/
My summary from searching through the history shown in the links above:
* gnuplot calls QLocalSocket::connectToServer("name")
* Qt tries to open a named pipe for the socket using O_NONBLOCK
* This fails because Cygwin has problems with non-blocking named
pipes. Back in 2010 Enrico Forestieri posted some simple examples of
this (standalone tests, no involvement of gnuplot code) but this
apparently did not lead to a fix.
* the Qt patch at the head of this bug report would make gnuplot work, but needs to be wrapped in a conditional test for CYGWIN. I can
understand why upstream Qt would not want to deal with this.
Conclusion: We probably can't fix it in the gnuplot code. There is a trivial work-around that requires modifying the Qt source code, but
this would only make sense for the purpose of making a Qt package
specifically for Cygwin.
Tatsuro
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next prev parent reply other threads:[~2019-03-05 23:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1439412702.1866573.1551653028041.JavaMail.yahoo.ref@mail.yahoo.co.jp>
2019-03-03 22:43 ` Tatsuro MATSUOKA
2019-03-04 16:32 ` Yaakov Selkowitz
2019-03-04 22:29 ` Tatsuro MATSUOKA
2019-03-05 12:57 ` Tatsuro MATSUOKA
2019-03-05 19:24 ` Achim Gratz
2019-03-05 23:58 ` Tatsuro MATSUOKA [this message]
2019-03-06 0:10 ` Tatsuro MATSUOKA
2019-03-06 1:10 ` Tatsuro MATSUOKA
2019-03-06 1:55 ` Tatsuro MATSUOKA
2019-03-06 2:25 ` Tatsuro MATSUOKA
2019-03-11 0:28 ` Tatsuro MATSUOKA
2019-03-11 0:50 ` Andrey Repin
2019-03-11 0:53 ` Yaakov Selkowitz
2019-03-11 3:33 ` Tatsuro MATSUOKA
2019-03-11 7:21 ` Mark Geisert
2019-03-11 7:56 ` Tatsuro MATSUOKA
2019-03-12 4:21 ` Mark Geisert
2019-03-12 6:51 ` Tatsuro MATSUOKA
2019-03-12 8:04 ` Patch request to qt 5.9.4 Mark Geisert
2019-03-12 8:26 ` Tatsuro MATSUOKA
2019-03-12 19:37 ` Achim Gratz
2019-03-12 23:22 ` Tatsuro MATSUOKA
2019-03-13 1:12 ` Mark Geisert
2019-03-13 4:27 ` Tatsuro MATSUOKA
2019-03-13 8:33 ` Mark Geisert
2019-03-15 8:06 ` Mark Geisert
2019-03-15 9:40 ` Tatsuro MATSUOKA
2019-03-16 0:41 ` Tatsuro MATSUOKA
2019-03-12 19:34 ` Achim Gratz
2019-03-11 9:45 ` Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4) Corinna Vinschen
2019-03-12 4:16 ` Mark Geisert
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