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Re: Clipboard integration does not work with XDMCP
- From: Jon TURNEY <jon dot turney at dronecode dot org dot uk>
- To: cygwin-xfree at cygwin dot com
- Cc: danilo dot turina at alcatel-lucent dot com
- Date: Sat, 22 Feb 2014 13:36:51 +0000
- Subject: Re: Clipboard integration does not work with XDMCP
- Authentication-results: sourceware.org; auth=none
- References: <530783F6 dot 90209 at alcatel-lucent dot com>
- Reply-to: cygwin-xfree at cygwin dot com
- Reply-to: cygwin-xfree <cygwin-xfree at cygwin dot com>
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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