Hello Mohammed,
I add that to my intrface session but i get the next error
*error: ‘Meta’ does not name a type* and another error
*no type named ‘Rpc_functions’ in ‘struct myrpcsession::Session’* I looked to the "cpu_session.h" and tried to do same but i think i miss some thing .
maybe, your interface is not declared within the 'Genode' namespace? Could you try to specify 'Genode::' as prefix for 'Meta::' and 'Rpc_functions' respectively?
Cheers Norman