Refactoring: remove struct_size from struct lttng_ust_ctx_value

[lttng-ust.git] / include / ust-context-provider.h

diff --git a/include/ust-context-provider.h b/include/ust-context-provider.h
index 3b41a66e5322f610dac233565b9a912dab54afec..e62950e1e81c7b9b7d7b77e9a62eb3ca7dd60356 100644 (file)
--- a/include/ust-context-provider.h
+++ b/include/ust-context-provider.h
@@ -21,26 +21,20 @@
  * Context value
  *
  * IMPORTANT: this structure is part of the ABI between the probe and
- * UST. Fields need to be only added at the end, never reordered, never
- * removed.
- *
- * The field @struct_size should be used to determine the size of the
- * structure. It should be queried before using additional fields added
- * at the end of the structure.
+ * UST. Additional selectors may be added in the future, mapping to new
+ * union fields, which means the overall size of this structure may
+ * increase. This means this structure should never be nested within a
+ * public structure interface, nor embedded in an array.
  */
 
 struct lttng_ust_ctx_value {
-       uint32_t struct_size;
-
-       enum lttng_ust_dynamic_type sel;
+       enum lttng_ust_dynamic_type sel;        /* Type selector */
        union {
                int64_t s64;
                uint64_t u64;
                const char *str;
                double d;
        } u;
-
-       /* End of base ABI. Fields below should be used after checking struct_size. */
 };
 
 /*