Initial work for kernel tracing support

[lttng-tools.git] / lttng / lttng.c

diff --git a/lttng/lttng.c b/lttng/lttng.c
index 9714e8a3476c10ad721362bca4d019c1c2fc62ae..7fbbcd68f4f216388aedc661f8b2cef4951c0778 100644 (file)
--- a/lttng/lttng.c
+++ b/lttng/lttng.c
@@ -50,6 +50,7 @@ static int process_opt_list_traces(void);
 static int process_opt_create_session(void);
 static int process_kernel_create_trace(void);
 static int process_opt_kernel_event(void);
+static int process_kernel_start_trace(void);
 static int set_session_uuid(void);
 static void sighandler(int sig);
 static int set_signal_handler(void);
@@ -137,6 +138,22 @@ static int process_client_opt(void)
                } else {
                        // Enable all events
                }
+
+               if (auto_trace || opt_start_trace) {
+                       DBG("Starting kernel tracing");
+                       ret = process_kernel_start_trace();
+                       if (ret < 0) {
+                               goto end;
+                       }
+               }
+
+               if (opt_stop_trace) {
+                       DBG("Stopping kernel tracing");
+                       ret = lttng_kernel_stop_tracing();
+                       if (ret < 0) {
+                               goto end;
+                       }
+               }
        }
 
        if (opt_trace_pid != 0) {
@@ -175,6 +192,33 @@ error:     /* fall through */
        return ret;
 }
 
+/*
+ *  process_kernel_start_trace
+ *
+ *  Start a kernel trace.
+ */
+static int process_kernel_start_trace(void)
+{
+       int ret;
+
+       ret = lttng_kernel_create_stream();
+       if (ret < 0) {
+               goto error;
+       }
+
+       ret = lttng_kernel_start_tracing();
+       if (ret < 0) {
+               goto error;
+       }
+
+       MSG("Kernel tracing started");
+
+       return 0;
+
+error:
+       return ret;
+}
+
 /*
  *  process_kernel_create_trace
  *