+ u8 n_fds;
+ u8 fd_flags;
+ u32 segment_size;
+ u32 app_index;
+ u64 segment_handle;
+ string segment_name[];
+};
+
+/** \brief Application attach to session layer
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param options - segment size, fifo sizes, etc.
+ @param namespace_id - string
+*/
+ define app_attach {
+ u32 client_index;
+ u32 context;
+ u64 options[17];
+ string namespace_id[];
+ };
+
+ /** \brief Application attach reply
+ @param context - sender context, to match reply w/ request
+ @param retval - return code for the request
+ @param app_mq - app message queue
+ @param vpp_ctrl_mq - vpp message queue for control events that should
+ be handled in main thread, i.e., bind/connect
+ @param vpp_ctrl_mq_thread_index - thread index of the ctrl mq
+ @param app_index - index of the newly created app
+ @param n_fds - number of fds exchanged
+ @param fd_flags - set of flags that indicate which fds are to be expected
+ over the socket (set only if socket transport available)
+ @param segment_size - size of first shm segment
+ @param segment_handle - handle for segment
+ @param segment_name - name of segment client needs to attach to
+*/
+define app_attach_reply {
+ u32 context;
+ i32 retval;
+ u64 app_mq;
+ u64 vpp_ctrl_mq;
+ u8 vpp_ctrl_mq_thread;
+ u32 app_index;
+ u8 n_fds;
+ u8 fd_flags;