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copied!<p>It is not easy in any way. Each linux distribution uses different places to store IP addresses, etc. (more variation if you consider other UNIX variants). You <em>can</em> use, for example, <code>/sbin/ifconfig</code> to obtain the IP addresses of the interfaces, but you cannot even be sure if you'll find it at this place, or at all, etc.</p> <p>Also, given you have that executable, you have to set up a thread calling it to obtain the data with a given period (say 5 seconds), and interpret the output. It may vary, for example, if you have bridges, etc. etc. That is, it is not easy.</p> <p>A solution that comes to my mind is, if you have the opportunity of using GNOME or some other widespread distribution as KDE, you can rely on the messages/informations they give. For example, <code>NetworkManager</code> outputs a signal to the <a href="http://www.freedesktop.org/wiki/Software/dbus" rel="nofollow noreferrer">DBUS standard bus</a> when a device changes. You have to implement a listener for those signal. Information <a href="http://people.redhat.com/dcbw/NetworkManager/NetworkManager%20DBUS%20API.txt" rel="nofollow noreferrer">here</a> (not working right now, so here is a <a href="http://209.85.229.132/search?q=cache:hUnwH0JfIUsJ:people.redhat.com/dcbw/NetworkManager/NetworkManager%2520DBUS%2520API.txt+network+manager+dbus+messages&hl=es&ct=clnk&cd=3&gl=es&client=firefox-a" rel="nofollow noreferrer">cache</a>). Note the different messages when a new interface is added, or when one of them changes the IP address. This is the best way I can think of right now.</p>

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