X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libust%2Ftracectl.c;h=97c515cfa68dcbbf6227c263ebc2dd2714cd256f;hb=c396a8419a176d0eda4a96a639f1cafb178e6dc7;hp=47ca740781ebb0528c80d62c9e397702b8e415dc;hpb=803a4f584bbc64ff44173ced627636f9e6db6618;p=ust.git

diff --git a/libust/tracectl.c b/libust/tracectl.c
index 47ca740..97c515c 100644
--- a/libust/tracectl.c
+++ b/libust/tracectl.c
@@ -46,6 +46,11 @@
 
 char consumer_stack[10000];
 
+/* This should only be accessed by the constructor, before the creation
+ * of the listener, and then only by the listener.
+ */
+s64 pidunique = -1LL;
+
 struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers);
 
 static struct ustcomm_app ustcomm_app;
@@ -93,6 +98,20 @@ struct blocked_consumer {
 	struct list_head list;
 };
 
+static long long make_pidunique(void)
+{
+	s64 retval;
+	struct timeval tv;
+	
+	gettimeofday(&tv, NULL);
+
+	retval = tv.tv_sec;
+	retval <<= 32;
+	retval |= tv.tv_usec;
+
+	return retval;
+}
+
 static void print_markers(FILE *fp)
 {
 	struct marker_iter iter;
@@ -682,6 +701,19 @@ void *listener_main(void *p)
 				WARN("could not disable marker; channel=%s, name=%s", channel_name, marker_name);
 			}
 		}
+		else if(nth_token_is(recvbuf, "get_pidunique", 0) == 1) {
+			char *reply;
+
+			asprintf(&reply, "%lld", pidunique);
+
+			result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
+			if(result) {
+				ERR("listener: get_pidunique: ustcomm_send_reply failed");
+				goto next_cmd;
+			}
+
+			free(reply);
+		}
 //		else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
 //			struct ltt_trace_struct *trace;
 //			char trace_name[] = "auto";
@@ -867,6 +899,11 @@ static void __attribute__((constructor(1000))) init()
 	int result;
 	char* autoprobe_val = NULL;
 
+	/* Assign the pidunique, to be able to differentiate the processes with same
+	 * pid, (before and after an exec).
+	 */
+	pidunique = make_pidunique();
+
 	/* Initialize RCU in case the constructor order is not good. */
 	urcu_init();
 
@@ -988,31 +1025,34 @@ static void __attribute__((constructor(1000))) init()
 }
 
 /* This is only called if we terminate normally, not with an unhandled signal,
- * so we cannot rely on it. */
+ * so we cannot rely on it. However, for now, LTTV requires that the header of
+ * the last sub-buffer contain a valid end time for the trace. This is done
+ * automatically only when the trace is properly stopped.
+ *
+ * If the traced program crashed, it is always possible to manually add the
+ * right value in the header, or to open the trace in text mode.
+ *
+ * FIXME: Fix LTTV so it doesn't need this.
+ */
 
-/* This destructor probably isn't needed, because ustd can do crash recovery. */
-#if 0
-static void __attribute__((destructor)) fini()
+static void destroy_traces(void)
 {
-//	int result;
+	int result;
 
 	/* if trace running, finish it */
 
-//	DBG("destructor stopping traces");
+	DBG("destructor stopping traces");
 
-//	result = ltt_trace_stop("auto");
-//	if(result == -1) {
-//		ERR("ltt_trace_stop error");
-//	}
-//
-//	result = ltt_trace_destroy("auto");
-//	if(result == -1) {
-//		ERR("ltt_trace_destroy error");
-//	}
-//
-//	destroy_socket();
+	result = ltt_trace_stop("auto");
+	if(result == -1) {
+		ERR("ltt_trace_stop error");
+	}
+
+	result = ltt_trace_destroy("auto");
+	if(result == -1) {
+		ERR("ltt_trace_destroy error");
+	}
 }
-#endif
 
 static int trace_recording(void)
 {
@@ -1082,6 +1122,17 @@ static void __attribute__((destructor)) keepalive()
 		}
 		DBG("Finally dying...");
 	}
+
+	destroy_traces();
+
+	ustcomm_fini_app(&ustcomm_app);
+}
+
+void ust_potential_exec(void)
+{
+	trace_mark(ust, potential_exec, MARK_NOARGS);
+
+	keepalive();
 }
 
 /* Notify ust that there was a fork. This needs to be called inside
@@ -1116,7 +1167,7 @@ void ust_fork(void)
 	result = ltt_trace_set_type("auto", "ustrelay");
 	if(result < 0) {
 		ERR("ltt_trace_set_type failed");
-		return (void *)1;
+		return;
 	}
 
 	ltt_trace_alloc("auto");