From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 11 Mar 2021 21:02:00 +0000 (-0500)
Subject: Add structure size field to struct lttng_session
X-Git-Tag: v2.13.0-rc1~308
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=bd640d74f149ce079f81103221a8aaafca02ce04;p=lttng-ust.git

Add structure size field to struct lttng_session

Made possible by ABI bump. This scheme can be used for extensibility.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I8d264969b866e7f06a835731753911718dd09727
---

diff --git a/include/lttng/ust-events.h b/include/lttng/ust-events.h
index 37e5575e..0e80c282 100644
--- a/include/lttng/ust-events.h
+++ b/include/lttng/ust-events.h
@@ -559,6 +559,7 @@ struct lttng_ust_session_private;
  * removed.
  */
 struct lttng_session {
+	uint32_t struct_size;			/* Size of this structure */
 	struct lttng_ust_session_private *priv;	/* Private session interface */
 
 	int active;				/* Is trace session active ? */
diff --git a/liblttng-ust/lttng-events.c b/liblttng-ust/lttng-events.c
index d29a6c71..92f04a3c 100644
--- a/liblttng-ust/lttng-events.c
+++ b/liblttng-ust/lttng-events.c
@@ -138,6 +138,7 @@ struct lttng_session *lttng_session_create(void)
 	session = zmalloc(sizeof(struct lttng_session));
 	if (!session)
 		return NULL;
+	session->struct_size = sizeof(struct lttng_session);
 	session_priv = zmalloc(sizeof(struct lttng_ust_session_private));
 	if (!session_priv) {
 		free(session);