X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=include%2Flttng%2Ftracepoint-types.h;h=42fe948657613d61c7df9db596abb023662287ad;hb=9b14815a9ee98c0dbc842a1e545cd6a82ae7b18a;hp=5f3870868d80e847d77b19c15661c9d3089c981a;hpb=51489cadd9c38c10261bdbab9b5e72803c95a732;p=lttng-ust.git

diff --git a/include/lttng/tracepoint-types.h b/include/lttng/tracepoint-types.h
index 5f387086..42fe9486 100644
--- a/include/lttng/tracepoint-types.h
+++ b/include/lttng/tracepoint-types.h
@@ -1,45 +1,51 @@
-#ifndef _LTTNG_TRACEPOINT_TYPES_H
-#define _LTTNG_TRACEPOINT_TYPES_H
-
 /*
- * Copyright (C) 2008-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2009 Pierre-Marc Fournier
- * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
+ * SPDX-License-Identifier: MIT
  *
- * 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;
- * version 2.1 of the License.
+ * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ */
+
+#ifndef _LTTNG_UST_TRACEPOINT_TYPES_H
+#define _LTTNG_UST_TRACEPOINT_TYPES_H
+
+#include <stdint.h>
+
+/*
+ * Tracepoint probe definition
  *
- * 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.
+ * IMPORTANT: this structure is part of the ABI between instrumented
+ * applications and UST. This structure is fixed-size because it is part
+ * of a public array of structures. Rather than extending this
+ * structure, struct lttng_ust_tracepoint should be extended instead.
+ */
+
+struct lttng_ust_tracepoint_probe {
+	void (*func)(void);
+	void *data;
+};
+
+/*
+ * Tracepoint definition
  *
- * 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
+ * IMPORTANT: this structure is part of the ABI between instrumented
+ * applications and UST. Fields need to be only added at the end, never
+ * reordered, never removed.
  *
- * Heavily inspired from the Linux Kernel Markers.
+ * 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.
  */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
+struct lttng_ust_tracepoint {
+	uint32_t struct_size;
 
-struct tracepoint_probe {
-	void *func;
-	void *data;
-};
+	const char *provider_name;
+	const char *event_name;
+	int state;
+	struct lttng_ust_tracepoint_probe *probes;
+	int *tracepoint_provider_ref;
+	const char *signature;
 
-struct tracepoint {
-	const char *name;		/* Tracepoint name */
-	char state;			/* State. */
-	struct tracepoint_probe *probes;
+	/* End of base ABI. Fields below should be used after checking struct_size. */
 };
 
-#ifdef __cplusplus 
-}
-#endif
-
-#endif /* _LTTNG_TRACEPOINT_TYPES_H */
+#endif /* _LTTNG_UST_TRACEPOINT_TYPES_H */