Add CTF enum type support to tracepoint event

[deliverable/lttng-ust.git] / liblttng-ust / ust-core.c

diff --git a/liblttng-ust/ust-core.c b/liblttng-ust/ust-core.c
index 60cdbfa91a2c876f5d5ae05db7a6ceae2a065df6..60751dc32a9aa56058e1452f3e9ddec4a395981b 100644 (file)
--- a/liblttng-ust/ust-core.c
+++ b/liblttng-ust/ust-core.c
@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <lttng/ust-events.h>
 #include <usterr-signal-safe.h>
+#include "jhash.h"
 
 static CDS_LIST_HEAD(lttng_transport_list);
 
@@ -56,3 +57,26 @@ void lttng_transport_unregister(struct lttng_transport *transport)
 {
        cds_list_del(&transport->node);
 }
+
+/*
+ * Needed by comm layer.
+ */
+struct lttng_enum *lttng_ust_enum_get(struct lttng_session *session,
+               const char *enum_name)
+{
+       struct lttng_enum *_enum;
+       struct cds_hlist_head *head;
+       struct cds_hlist_node *node;
+       size_t name_len = strlen(enum_name);
+       uint32_t hash;
+
+       hash = jhash(enum_name, name_len, 0);
+       head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)];
+       cds_hlist_for_each_entry(_enum, node, head, hlist) {
+               assert(_enum->desc);
+               if (!strncmp(_enum->desc->name, enum_name,
+                               LTTNG_UST_SYM_NAME_LEN - 1))
+                       return _enum;
+       }
+       return NULL;
+}