X2Go Bug report logs - #543
x2golistdesktops locks up if xwininfo does

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Package: x2godesktopsharing; Maintainer for x2godesktopsharing is X2Go Developers <x2go-dev@lists.x2go.org>;

Reported by: "Gregory R. Warnes" <greg@warnes.net>

Date: Wed, 9 Jul 2014 22:00:02 UTC

Severity: normal

Tags: patch, pending

Found in version 3.1.1.1-0~131~ubuntu12

Fixed in version 4.0.1.16

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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Subject: Bug#543: [X2Go-Dev] Bug#543: x2golistdesktops locks up if xwininfo does
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From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: "Gregory R. Warnes" <greg@warnes.net>, 543@bugs.x2go.org
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[Message part 1 (text/plain, inline)]
Control: tag -1 patch

On  Mi 09 Jul 2014 23:57:09 CEST, Gregory R. Warnes wrote:


> Hi,  my server had a ?weird? file in /tmp/.X11-unix/ for which  
> xwininfo would never return, locking up x2golistdesktops.
>
> The solution is to provide a timeout for the shell call to xwininfo.  
>  This can be accomplished either using the shell command ?timeout?  
> or the Perl IPC::Run module (as described in the first response to  
> http://stackoverflow.com/questions/16918005/time-out-when-using-system-cmd-in-perl).
>
> For my purpose, I?ve used the shell timeout command. Patch below.
>
> -Greg
>
>
> --- /usr/bin/x2golistdesktops	2014-04-03 10:14:22.000000000 -0500
> +++ x2golistdesktops	2014-07-09 16:43:54.000000000 -0500
> @@ -43,7 +43,7 @@
>  	$serv=hostname;
>  }
>
> -my $rsess=`x2golistsessions x2goserver |grep _stR`;
> +my $rsess=`timeout 1s x2golistsessions x2goserver |grep _stR`;
>  my @rsess=split("\n","$rsess");
>  my @rdisplays;
>  for (my $i=0;$i<@rsess;$i++)
> @@ -67,7 +67,7 @@
>  	$checkdisp="${checkdisp}I";
>  	if (!( $rdisp =~ m/$checkdisp/ ))
>  	{
> -		my $inf=`xwininfo -root -display $display 2> /dev/null`;
> +		my $inf=`timeout 1s xwininfo -root -display $display 2> /dev/null`;
>  		if ( $inf=~ m/geometry/)
>  		{
>  			print "$uname\@$display\n";
> @@ -88,4 +88,4 @@
>  }
>
>  # closing syslog
> -closelog;
> \ No newline at end of file
> +closelog;
> w

The glorious question here is, actually: Why does xwininfo hang in the  
first place?

Mike
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