Implement tracef() instrumentation API

[lttng-ust.git] / liblttng-ust / tracef.c

diff --git a/liblttng-ust/tracef.c b/liblttng-ust/tracef.c
new file mode 100644 (file)
index 0000000..9ef063c
--- /dev/null
+++ b/liblttng-ust/tracef.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2013-2014  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _GNU_SOURCE
+#define _LGPL_SOURCE
+#include <stdio.h>
+
+#define TRACEPOINT_CREATE_PROBES
+#define TRACEPOINT_DEFINE
+#include "lttng-ust-tracef-provider.h"
+
+void _lttng_ust_tracef(const char *fmt, ...)
+{
+       va_list ap;
+       char *msg;
+       int len;
+
+       va_start(ap, fmt);
+       len = vasprintf(&msg, fmt, ap);
+       /* len does not include the final \0 */
+       if (len < 0)
+               goto end;
+       __tracepoint_cb_lttng_ust_tracef___event(msg, len);
+       free(msg);
+end:
+       va_end(ap);
+}