If libvirtd terminates while event-test.py has an open connection to it,
it will crash with the following traceback:

> myConnectionCloseCallback: qemu:///session: Error
> Exception in thread libvirtEventLoop:
> Traceback (most recent call last):
>   File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
>     self.run()
>   File "/usr/lib/python2.7/threading.py", line 754, in run
>     self.__target(*self.__args, **self.__kwargs)
>   File "examples/event-test.py", line 424, in virEventLoopPollRun
>     eventLoop.run_loop()
>   File "examples/event-test.py", line 242, in run_loop
>     self.run_once()
>   File "examples/event-test.py", line 187, in run_once
>     libvirt.virEventInvokeFreeCallback(opaque)
> AttributeError: 'module' object has no attribute 'virEventInvokeFreeCallback'
>
> libvirt: XML-RPC error : internal error: client socket is closed
> Traceback (most recent call last):
>   File "examples/event-test.py", line 872, in <module>
>     main()
>   File "examples/event-test.py", line 854, in main
>     vc.secretEventDeregisterAny(id)
>   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 4987, in secretEventDeregisterAny
>     if ret == -1: raise libvirtError ('virConnectSecretEventDeregisterAny() failed', conn=self)
> libvirt.libvirtError: internal error: client socket is closed
> Closing qemu:///session

Skip unregistering the event callbacks and closing the connection if the
connection is already broken / closed.

Signed-off-by: Philipp Hahn <hahn@univention.de>
---
 examples/event-test.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/examples/event-test.py b/examples/event-test.py
index 04310e1..c17d2bb 100755
--- a/examples/event-test.py
+++ b/examples/event-test.py
@@ -716,7 +716,8 @@ def main():
     old_exitfunc = getattr(sys, 'exitfunc', None)
     def exit():
         print("Closing " + vc.getURI())
-        vc.close()
+        if run:
+            vc.close()
         if (old_exitfunc): old_exitfunc()
     sys.exitfunc = exit
 
@@ -777,6 +778,11 @@ def main():
         count = count + 1
         time.sleep(1)
 
+    # If the connection was closed, we cannot unregister anything.
+    # Just abort now.
+    if not run:
+        return
+
     vc.domainEventDeregister(myDomainEventCallback1)
 
     for id in seccallbacks:
-- 
2.11.0

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