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From: Mark Geisert <mark@maxrnd.com>
Message-ID: <391509cb-f59f-7d12-2de0-3b009a116c2d@maxrnd.com>
Date: Mon, 11 Mar 2019 21:16:44 -0700
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Corinna Vinschen wrote:
> 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.
>>>
>>> with the above patch ()
>>> qt_safe_socket(PF_UNIX, SOCK_STREAM, 0))
>>> gnuplot can connect with gnuplot_qt.
>>>
>>> Perhaps qt with O_NONBLOCK is some wrong with process connection.
>>
>> Hi Tatsuro,
>> For the record, what Enrico supplied is what we'd call an STC, a Simple Test
>> Case.  Unfortunately his STC dealt with select() on a named pipe.
>>
>> 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.

Thank you Corinna for the correction.  That should make the strace output more 
understandable :-).

..mark


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