X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=include%2Flttng%2Flttng.h;h=4ffffd84ff237bedddbf1bbc27c325c32136b521;hb=1bc8fb0d56c2f9486e2bbdf278b6e0f22ac84510;hp=3e7fb63169e83b780ad247a3fda616bbade91050;hpb=7c612c2e69f7b4ebf77fd369126befb71e561a8f;p=lttng-tools.git

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index 3e7fb6316..4ffffd84f 100644
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -326,12 +326,13 @@ struct lttng_calibrate {
  *
  * The structures should be initialized to zero before use.
  */
-#define LTTNG_SESSION_PADDING1             16
+#define LTTNG_SESSION_PADDING1             12
 struct lttng_session {
 	char name[NAME_MAX];
 	/* The path where traces are written */
 	char path[PATH_MAX];
 	uint32_t enabled;	/* enabled/started: 1, disabled/stopped: 0 */
+	uint32_t snapshot_mode;
 
 	char padding[LTTNG_SESSION_PADDING1];
 };
@@ -390,6 +391,21 @@ extern void lttng_destroy_handle(struct lttng_handle *handle);
  */
 extern int lttng_create_session(const char *name, const char *url);
 
+/*
+ * Create a tracing session that will exclusively be used for snapshot meaning
+ * the session will be in no output mode and every channel enabled for that
+ * session will be set in overwrite mode and in mmap output since splice is not
+ * supported.
+ *
+ * If an url is given, it will be used to create a default snapshot output
+ * using it as a destination. If NULL, no output will be defined and an
+ * add-output call will be needed.
+ *
+ * Name can't be NULL.
+ */
+extern int lttng_create_session_snapshot(const char *name,
+		const char *snapshot_url);
+
 /*
  * Destroy a tracing session.
  *