* Prefer using this macro where "special" values would be used, e.g.
* -1ULL for uint64_t types.
*
- * LTTNG_OPTIONAL should be combined with the LTTNG_PACKED macro when
- * used for IPC / network communication.
- *
* Declaration example:
* struct my_struct {
* int a;
type value; \
}
+/*
+ * Alias used for communication structures. If the layout of an LTTNG_OPTIONAL
+ * is changed, the original layout should still be used for communication
+ * purposes.
+ *
+ * LTTNG_OPTIONAL_COMM should be combined with the LTTNG_PACKED macro when
+ * used for IPC / network communication.
+ */
+#define LTTNG_OPTIONAL_COMM LTTNG_OPTIONAL
+
/*
* This macro is available as a 'convenience' to allow sites that assume
* an optional value is set to assert() that it is set when accessing it.