Fix: no-output sessions do not enforce snapshot constraints

[lttng-tools.git] / src / bin / lttng-sessiond / session.h

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index 6a0da6c164f95a48b15a2e0250611d77a0dcf2ec..8d41c38aa60c911174f37ba92909f1c7d4ab345b 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -114,11 +114,19 @@ struct ltt_session {
        /* Indicate if the session has to output the traces or not. */
        unsigned int output_traces;
        /*
-        * This session is in snapshot mode. This means that every channel enabled
-        * will be set in overwrite mode and mmap. It is considered exclusively for
-        * snapshot purposes.
+        * This session is in snapshot mode. This means that channels enabled
+        * will be set in overwrite mode by default and must be in mmap
+        * output mode. Note that snapshots can be taken on a session that
+        * is not in "snapshot_mode". This parameter only affects channel
+        * creation defaults.
         */
        unsigned int snapshot_mode;
+       /*
+        * A session that has channels that don't use 'mmap' output can't be
+        * used to capture snapshots. This is set to true whenever a
+        * 'splice' kernel channel is enabled.
+        */
+       bool has_non_mmap_channel;
        /*
         * Timer set when the session is created for live reading.
         */