Re: Clipboard integration does not work with XDMCP

[Jon TURNEY <jon.turney@dronecode.org.uk>]

On 21/02/2014 16:51, Danilo Turina wrote:
> Hello,
>      I need to connect from my PC to a Linux machine that runs KDE and I use
> the following command:
> 
>     XWin -from MY_PC_IP_ADDR -terminate -query LINUX_MACHINE_IP_ADDR
> 
> It works well but the clipboard integration that fails.
> 
> Notice that:
>     1) XWin alone (i.e. no XDMCP, i.e. local) works nicely with my Windows
> clipboard
>     2) Xming works (almost) fine with XDMCP + clipboard (with the same Linux
> machine)
> 
> I gave a look at the XWin log in two cases:
>     A) XWin alone
>     B) XWin + XDMCP
> 
> And the only differences I've found (apart from the different command line
> arguments) is the following lines that were at the end of the log of the XDMCP
> invokation:
> 
> winProcEstablishConnection - winInitClipboard returned.
> winClipboardThreadProc - DISPLAY=:0.0
> winClipboardProc - XOpenDisplay () returned and successfully opened the display.
> winClipboardIOErrorHandler!
> winClipboardProc - setjmp returned for IO Error Handler.
> winClipboardProc - trying to restart clipboard thread
> winClipboardThreadProc - DISPLAY=:0.0
> winClipboardProc - XOpenDisplay () returned and successfully opened the display.
> winClipboardProc - winClipboardFlushWindowsMessageQueue trapped WM_QUIT
> message, exiting main loop.
> winClipboardProc - XDestroyWindow succeeded.

Thanks for reporting this problem, and the clear reproduction steps.

The issue here is that the XDMCP login dialog kills all other X clients
(including the clipboard integration client) for security.  The clipboard
integration client is supposed to restart and reconnect as necessary, but it
seems this has been broken for a while.

I've has a go at fixing this and uploaded a snapshot at [1].  Perhaps you
could try that and see if it improves things for you?

[1] ftp://cygwin.com/pub/cygwinx/XWin.20140222-git-c14d82e878fc884d.exe.bz2

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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