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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Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):

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Subject: x2golistdesktops locks up if xwininfo does
Message-Id: <DF03EDF1-51CB-4E07-B316-4411BC0D97CB@warnes.net>
Date: Wed, 9 Jul 2014 17:57:09 -0400
To: submit@bugs.x2go.org
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[Message part 1 (text/plain, inline)]
Package:  x2godesktopsharing
Version: 3.1.1.1-0~131~ubuntu12


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


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