Here is a list of all documented variables with links to the struct/union documentation for each field:

### - u -

- u : DBusMessageRealIter, DBusTypeReader, DBusTypeWriter
- u16 : DBusBasicValue
- u32 : DBusBasicValue
- u64 : DBusBasicValue
- uid : DBusStat, DBusUserInfo
- unique_name : BusData
- unix_fd_negotiated : DBusAuth
- unix_fd_possible : DBusAuth
- unix_fd_value : DBusCounter
- unix_user_data : DBusTransport
- unix_user_function : DBusTransport
- unregister_function : DBusObjectPathVTable, DBusObjectSubtree
- unused_bytes_recovered : DBusTransport
- used_so_far : DBusMemBlock
- user_data : DBusMessageFilter, DBusObjectSubtree
- username : DBusUserInfo