+/* *INDENT-OFF* */
+static char *session_error_str[] = {
+#define _(sym, str) str,
+ foreach_session_error
+#undef _
+};
+/* *INDENT-ON* */
+
+static inline u8 *
+format_session_error (u8 * s, va_list * args)
+{
+ session_error_t error = va_arg (*args, session_error_t);
+ if (-error >= 0 && -error < SESSION_N_ERRORS)
+ s = format (s, "%s", session_error_str[-error]);
+ else
+ s = format (s, "invalid session err %u", -error);
+ return s;
+}
+
+/*
+ * Socket API messages
+ */
+
+typedef enum app_sapi_msg_type
+{
+ APP_SAPI_MSG_TYPE_NONE,
+ APP_SAPI_MSG_TYPE_ATTACH,
+ APP_SAPI_MSG_TYPE_ATTACH_REPLY,
+ APP_SAPI_MSG_TYPE_ADD_DEL_WORKER,
+ APP_SAPI_MSG_TYPE_ADD_DEL_WORKER_REPLY,
+ APP_SAPI_MSG_TYPE_SEND_FDS,
+} __clib_packed app_sapi_msg_type_e;
+
+typedef struct app_sapi_attach_msg_
+{
+ u8 name[64];
+ u64 options[18];
+} __clib_packed app_sapi_attach_msg_t;
+
+STATIC_ASSERT (sizeof (u64) * APP_OPTIONS_N_OPTIONS <=
+ sizeof (((app_sapi_attach_msg_t *) 0)->options),
+ "Out of options, fix message definition");
+
+typedef struct app_sapi_attach_reply_msg_
+{
+ i32 retval;
+ u32 app_index;
+ u64 app_mq;
+ u64 vpp_ctrl_mq;
+ u64 segment_handle;
+ u32 api_client_handle;
+ u8 vpp_ctrl_mq_thread;
+ u8 n_fds;
+ u8 fd_flags;
+} __clib_packed app_sapi_attach_reply_msg_t;
+
+typedef struct app_sapi_worker_add_del_msg_
+{
+ u32 app_index;
+ u32 wrk_index;
+ u8 is_add;
+} __clib_packed app_sapi_worker_add_del_msg_t;
+
+typedef struct app_sapi_worker_add_del_reply_msg_
+{
+ i32 retval;
+ u32 wrk_index;
+ u64 app_event_queue_address;
+ u64 segment_handle;
+ u32 api_client_handle;
+ u8 n_fds;
+ u8 fd_flags;
+ u8 is_add;
+} __clib_packed app_sapi_worker_add_del_reply_msg_t;
+
+typedef struct app_sapi_msg_
+{
+ app_sapi_msg_type_e type;
+ union
+ {
+ app_sapi_attach_msg_t attach;
+ app_sapi_attach_reply_msg_t attach_reply;
+ app_sapi_worker_add_del_msg_t worker_add_del;
+ app_sapi_worker_add_del_reply_msg_t worker_add_del_reply;
+ };
+} __clib_packed app_sapi_msg_t;
+