clock: read bootid as clock monotonic ID

[lttng-modules.git] / lttng-events.c

diff --git a/lttng-events.c b/lttng-events.c
index 6dd3ba4ed19ef1bfb77002c50c1ab90f3714375a..c25d4449ebec3e72985dee8ce246caed33655c08 100644 (file)
--- a/lttng-events.c
+++ b/lttng-events.c
@@ -16,6 +16,7 @@
 #include <linux/jiffies.h>
 #include "wrapper/uuid.h"
 #include "wrapper/vmalloc.h"   /* for wrapper_vmalloc_sync_all() */
+#include "wrapper/random.h"
 #include "lttng-events.h"
 #include "lttng-tracer.h"
 
@@ -881,7 +882,7 @@ static
 int _lttng_session_metadata_statedump(struct lttng_session *session)
 {
        unsigned char *uuid_c = session->uuid.b;
-       unsigned char uuid_s[37];
+       unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
        struct lttng_channel *chan;
        struct lttng_event *event;
        int ret = 0;
@@ -939,15 +940,27 @@ int _lttng_session_metadata_statedump(struct lttng_session *session)
 
        ret = lttng_metadata_printf(session,
                "clock {\n"
-               "       name = %s;\n"
-               "       uuid = %s;\n"
+               "       name = %s;\n",
+               "monotonic"
+               );
+       if (ret)
+               goto end;
+
+       if (!trace_clock_uuid(clock_uuid_s)) {
+               ret = lttng_metadata_printf(session,
+                       "       uuid = %s;\n",
+                       clock_uuid_s
+                       );
+               if (ret)
+                       goto end;
+       }
+
+       ret = lttng_metadata_printf(session,
                "       description = \"Monotonic Clock\";\n"
                "       freq = %llu; /* Frequency, in Hz */\n"
                "       /* clock value offset from Epoch is: offset * (1/freq) */\n"
                "       offset = %llu;\n"
                "};\n\n",
-               "monotonic",
-               trace_clock_uuid(),
                (unsigned long long) trace_clock_freq(),
                (unsigned long long) measure_clock_offset()
                );