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Date:	Tue, 12 Mar 2019 15:51:31 +0900 (JST)
From:	Tatsuro MATSUOKA <tmacchant2 AT yahoo DOT co DOT jp>
Reply-To:	Tatsuro MATSUOKA <matsuoka AT nuce DOT nagoya-u DOT ac DOT jp>
To:	Mark Geisert <mark AT maxrnd DOT com>, <cygwin AT cygwin DOT com>
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Subject:	Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
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----- Original Message -----
> From: Mark Geisert
> To: cygwin
> Date: 2019/3/12, Tue 13:20
> Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
> 
>T atsuro MATSUOKA wrote:
>>  ----- Original Message -----
>> 
>>>  From: Mark Geisert
>>>  To: cygwin
>>>  Cc:
>>>  Date: 2019/3/11, Mon 16:21
>>>  Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 5.9.4)
>>> 
>>>  T atsuro MATSUOKA wrote:
>>>>   ----- Original Message -----
>>>> 
>>>>>   From: Yaakov Selkowitz <yselkowitz
>>>>>   To: cygwin
>>>>>   Cc:
>>>>>   Date: 2019/3/11, Mon 09:53
>>>>>   Subject: Re: Patch request to qt 5.9.4 (Re: [ANNOUNCEMENT] Qt 
> 5.9.4)
>>>>> 
>>>>>   On Mon, 2019-03-11 at 09:28 +0900, Tatsuro MATSUOKA wrote:
>>>>>>    > On Mon, 2019-03-04 at 07:43 +0900, Tatsuro MATSUOKA 
> wrote:
>>>>>>    > >  I ask alpply a patch the below which enables 
> to use qt
>>>  terminal
>>>>>   on gnuplot
>>>>>>    > for Cygwin.
>>>>>>    > >  (cygQt5Network-5.dll is affected.)
>>>>>>    > >
>>>>>>    > >  ---
>>>>>   
> a/qtbase-opensource-src-5.9.4/src/network/socket/qlocalsocket_unix.cpp
>>>>>>    > >  +++
>>>>>   
> b/qtbase-opensource-src-5.9.4/src/network/socket/qlocalsocket_unix.cpp
>>>>>>    > >  @@ -239,7 +239,7 @@ void
>>>  QLocalSocket::connectToServer(OpenM
>>>>>>    > >      }
>>>>>>    > >      // create the socket
>>>>>>    > >  -    if (-1 == (d->connectingSocket =
>>>  qt_safe_socket(PF_UNIX,
>>>>>   SOCK_STREAM, 0, O_NONBLOCK))) {
>>>>>>    > >  +    if (-1 == (d->connectingSocket =
>>>  qt_safe_socket(PF_UNIX,
>>>>>   SOCK_STREAM, 0))) {
>>>>>>    > >
>>>  d->errorOccurred(UnsupportedSocketOperationError,
>>>>>   QLatin1String("QLocalSocket::connectToServer"));
>>>>>>    > >          return;
>>>>>>    > >
>>>>>>    >
>>>>>>    > It seems we keep going in circles on this point.  If 
> there is
>>>  a bug in
>>>>>>    > O_NONBLOCK, then please either narrow it down to an 
> STC, or
>>>  provide a
>>>>>>    > patch to Cygwin.
>>>>>> 
>>>>>>    Very basic question. What is STC?
>>>>>>    I googled but I cannot find what is it.
>>>>> 
>>>>>   https://cygwin.com/acronyms/#STC 
>>>> 
>>>> 
>>>>   Sorry I cannot make STC due to lack of knowledge of QT.
>>>>   In stead, I explain what gnuplot do.
>>>> 
>>>>   On gnuplot for qt,
>>>>   plot is done by child process named gnuplot_qt.
>>>> 
>>>>   When gnuplot connect with gnuplot with
>>>>     qt->socket.connectToServer(server);
>>>> 
>>>> 
>>>>   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.  This means we are mapping Unix/Linux socket constructs onto a
>>>  dissimilar feature of Windows, and there are many opportunities for 
> mismatch.
>>> 
>>>  Can you run your gnuplot under strace?  You would set up your 
> environment as
>>>  needed to reproduce the issue, then launch gnuplot as so:
>>>       strace -o gnuplot.trace gnuplot
>>>  This will create a trace file of Cygwin syscalls and operations.  Let 
> us know
>>>  how big (how many lines) are in the trace file and we'll see 
> what's
>>>  next.
>>> 
>>>  ..mark
>>> 
>> 
>>  I send xz commpress gnuplot.trace.
> 
> Next time we'll arrange private email for large things.  I'm now poring 
> over the 
> strace; thanks for sending it.
> 
> If it's not too much trouble, could you show what you tell gnuplot and how 
> you 
> set up the Qt environment?  Are you running gnuplot from inside qterminal?
> 
> ..mark
For qt graphics
gnuplot.exe uses driver process named gnuplot_qt.exe.

gnuplot.exe tries connect with gnuplot_qt.exe
by


qt->socket.connectToServer(server); 


in gnuplot.exe code but fails to connect with gnuplot_qt.exe.

 Tatsuro


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