Add CTF enum type support to tracepoint event

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

diff --git a/liblttng-ust/ust-core.c b/liblttng-ust/ust-core.c
index 404e0b26997bc37ec356355c23d24a4fe3191ce5..60751dc32a9aa56058e1452f3e9ddec4a395981b 100644 (file)
--- a/liblttng-ust/ust-core.c
+++ b/liblttng-ust/ust-core.c
@@ -18,20 +18,65 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <lttng/usterr-signal-safe.h>
 #include <stdlib.h>
+#include <lttng/ust-events.h>
+#include <usterr-signal-safe.h>
+#include "jhash.h"
 
-volatile enum ust_loglevel ust_loglevel;
+static CDS_LIST_HEAD(lttng_transport_list);
 
-void init_usterr(void)
+struct lttng_transport *lttng_transport_find(const char *name)
 {
-       char *ust_debug;
-
-       if (ust_loglevel == UST_LOGLEVEL_UNKNOWN) {
-               ust_debug = getenv("LTTNG_UST_DEBUG");
-               if (ust_debug)
-                       ust_loglevel = UST_LOGLEVEL_DEBUG;
-               else
-                       ust_loglevel = UST_LOGLEVEL_NORMAL;
+       struct lttng_transport *transport;
+
+       cds_list_for_each_entry(transport, &lttng_transport_list, node) {
+               if (!strcmp(transport->name, name))
+                       return transport;
+       }
+       return NULL;
+}
+
+/**
+ * lttng_transport_register - LTT transport registration
+ * @transport: transport structure
+ *
+ * Registers a transport which can be used as output to extract the data out of
+ * LTTng. Called with ust_lock held.
+ */
+void lttng_transport_register(struct lttng_transport *transport)
+{
+       cds_list_add_tail(&transport->node, &lttng_transport_list);
+}
+
+/**
+ * lttng_transport_unregister - LTT transport unregistration
+ * @transport: transport structure
+ * Called with ust_lock held.
+ */
+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;
 }