> I wonder if it might be something releated to the stdout

I've been thinking that also. Or stderr.

When gksudo was used to start wireshark, and the dumpcap -S -M process
is being sent a SIGPIPE (13, broken pipe), dumpcap does not exit. When
sudo was used, dumpcap does. So I reckon it could also have something to
do with signal handling.

Maybe someone knowing Gtk programming can have a look at it?

I also noticed that there have been upstream changes around hidden -Z
dumpcap option ('capture_child mode'). These changes were in Februari 2008. See 
the upstream ChangeLog file. It might be related but also it might not.

-- 
Wireshark halts in Capture Interfaces window when started using gksu (Hardy, 
Intrepid)
https://bugs.launchpad.net/bugs/198884
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