Move to kernel style SPDX license identifiers

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

diff --git a/liblttng-ust/ust-core.c b/liblttng-ust/ust-core.c
index 6574f93b194150540456bdb9dfd86d5479381acc..1ac726d9a69fc1f3e8b34461d5c5f22b5090ab70 100644 (file)
--- a/liblttng-ust/ust-core.c
+++ b/liblttng-ust/ust-core.c
@@ -1,23 +1,12 @@
 /*
- * ust-core.c
+ * SPDX-License-Identifier: LGPL-2.1-only
  *
  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define _LGPL_SOURCE
+#include <stdint.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <lttng/ust-events.h>
 #include <usterr-signal-safe.h>
@@ -25,6 +14,7 @@
 #include "jhash.h"
 
 static CDS_LIST_HEAD(lttng_transport_list);
+static CDS_LIST_HEAD(lttng_counter_transport_list);
 
 struct lttng_transport *lttng_transport_find(const char *name)
 {
@@ -37,6 +27,17 @@ struct lttng_transport *lttng_transport_find(const char *name)
        return NULL;
 }
 
+struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
+{
+       struct lttng_counter_transport *transport;
+
+       cds_list_for_each_entry(transport, &lttng_counter_transport_list, node) {
+               if (!strcmp(transport->name, name))
+                       return transport;
+       }
+       return NULL;
+}
+
 /**
  * lttng_transport_register - LTT transport registration
  * @transport: transport structure
@@ -59,24 +60,45 @@ void lttng_transport_unregister(struct lttng_transport *transport)
        cds_list_del(&transport->node);
 }
 
+/**
+ * lttng_counter_transport_register - LTTng counter transport registration
+ * @transport: transport structure
+ *
+ * Registers a counter transport which can be used as output to extract
+ * the data out of LTTng. Called with ust_lock held.
+ */
+void lttng_counter_transport_register(struct lttng_counter_transport *transport)
+{
+       cds_list_add_tail(&transport->node, &lttng_counter_transport_list);
+}
+
+/**
+ * lttng_counter_transport_unregister - LTTng counter transport unregistration
+ * @transport: transport structure
+ * Called with ust_lock held.
+ */
+void lttng_counter_transport_unregister(struct lttng_counter_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 *lttng_ust_enum_get_from_desc(struct lttng_session *session,
+               const struct lttng_enum_desc *enum_desc)
 {
        struct lttng_enum *_enum;
        struct cds_hlist_head *head;
        struct cds_hlist_node *node;
-       size_t name_len = strlen(enum_name);
+       size_t name_len = strlen(enum_desc->name);
        uint32_t hash;
 
-       hash = jhash(enum_name, name_len, 0);
+       hash = jhash(enum_desc->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))
+               if (_enum->desc == enum_desc)
                        return _enum;
        }
        return NULL;