sequence and variant types: use previous field for length/tag if NULL

[lttng-modules.git] / include / lttng / events.h

diff --git a/include/lttng/events.h b/include/lttng/events.h
index 2f48f6ef252a99b3f9b3e81b805d24a9da8938f3..613b9c49d7fc5e6cd23eaffc2b04beddaed1d27a 100644 (file)
--- a/include/lttng/events.h
+++ b/include/lttng/events.h
@@ -109,7 +109,7 @@ struct lttng_kernel_type_array {
 
 struct lttng_kernel_type_sequence {
        struct lttng_kernel_type_common parent;
-       const char *length_name;        /* Length field name. */
+       const char *length_name;        /* Length field name. If NULL, use previous field. */
        const struct lttng_kernel_type_common *elem_type;
        unsigned int alignment;         /* Alignment before elements. */
        enum lttng_kernel_string_encoding encoding;
@@ -124,7 +124,7 @@ struct lttng_kernel_type_struct {
 
 struct lttng_kernel_type_variant {
        struct lttng_kernel_type_common parent;
-       const char *tag_name;
+       const char *tag_name;           /* Tag field name. If NULL, use previous field. */
        const struct lttng_kernel_event_field **choices; /* Array of pointers to fields. */
        unsigned int nr_choices;
        unsigned int alignment;