[mythtv-users] Mythbackend does not bind to IP addresses of interfaces without carrier

[Florian Evers]

Hi Raymond,

Am Mittwoch, 26. Juni 2013, 13:17:46 schrieb Raymond Wagner:
> We get a list of available addresses on the system through the Qt
> libraries. If the address you want to use is not being used by
> MythBackend, it's because we're being told it doesn't currently exist,
> and so we don't attempt to bind to it.

Okay, that sounds very interesting, so I took a look into the sources. The 
results are as follows:

In the file libs/libmythbase/serverpool.cpp, the available interfaces are 
enumerated and their IP adresses are obtained. Very interesting is line 109. 
Here, the current interface iterator is checked if the interface is 
"isRunning"... and if it is not running, it is skipped!

An ethernet interface, fully configured, UP, but without a cable attached is 
NOT "isRunning". Same with a bridge that constists solely of interfaces that 
have no carrier... it is skipped as well. This is the reason for my problems.

Having a look at the docs at

http://harmattan-dev.nokia.com/docs/library/html/qt4/qnetworkinterface.html

brings to light that besides "NetworkInterface::IsRunning" there is also 
"QNetworkInterface::IsUp". Using the latter yields the expected behavior of 
mythbackend, and everything would be okay. 

Is there a reason why "isRunning" is used instead of "isUp"? If not, this 
would be a quick edit ;-)

Regards,
Florian