public static void SaveAtomic (Gdk.Pixbuf src, string filename, string type, string [] keys, string [] values)
{
string tmpname = filename + ".tmp";
src.Savev (tmpname, type, NullTerminateArray (keys), NullTerminateArray (values));
if (rename (tmpname, filename) < 0)
throw new Exception ("Error renaming file");
}