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Message-ID: <e62dc3d8-6130-4654-939e-b158d131916f@dronecode.org.uk>
Date: Sun, 6 Jul 2025 17:50:28 +0100
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Subject: Re: winClipboardFlushXEvents - OpenClipboard () failed: 00000005
To: Jim Reisert AD1C <jjreisert AT alum DOT mit DOT edu>
References: <CAK-n8j5obEsc2KotNWQL47tRJDzdRaEQUOkbWS56861f7CUJxw AT mail DOT gmail DOT com>
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From: Jon Turney via Cygwin <cygwin AT cygwin DOT com>
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On 05/07/2025 00:39, Jim Reisert AD1C via Cygwin wrote:
> I do a lot of copying/pasting between Windows and Cygwin-X.  If I try
> to copy too much, the server will crash.  The symptom is that
> copy/paste no longer works (in either direction).  I can still start

Hmm... so when you say "crash", you don't mean "exit, abnormally"?

It just keeps on running, but cut and past doesn't work?

> new terms (copy/paste still does not work), but ultimately, I have to
> kill the X server, delete the lock file, and restart it.
> 
> This is what that Xwin.log looks like when this happens:
> 
> [109491.656] winInitMultiWindowWM - xcb_connect () returned and
> successfully opened the display.
> [109491.656] winClipboardProc - xcb_connect () returned and
> successfully opened the display.
> [109491.671] Using Composite redirection
> [109530.609] OS has icon alpha channel support: yes
> [111304.578] winClipboardFlushXEvents - OpenClipboard () failed: 00000005
> [114502.656] winClipboardFlushXEvents - OpenClipboard () failed: 00000005
> [114502.656] winClipboardFlushXEvents - OpenClipboard () failed: 00000005
> [etc]

Sigh.

This code is old enough to shave and still doesn't work properly :(

In the past, these problems have sometimes been caused by "clipboard 
helper/manager" type Windows programs.  You might want to check if 
you're running such a thing and see if stopping it makes a difference.

> cygcheck.out is attached, along with a log file showing the problem.
> 
> I'd love to know if there is a solution or work-around for this.
> Oftentimes, I have several different Emacs buffers open and thus need
> to close each one before restarting the server (then remember where I
> was).

As a workaround, you can try:

* start the X server with the '-noclipboard' option
* run 'xwinclip'

(this is the same code which is built into a thread in the server, but 
built as a standalone tool; if it also gets wedged, you can just kill 
and restart it, rather than the X server and everything connected to it)

The whole thing [1] really isn't very large, so finding what's wrong 
with it should be easy, right? :)

[1] 
https://gitlab.freedesktop.org/xorg/xserver/-/tree/master/hw/xwin/winclipboard


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