Implement getcpu override

[lttng-ust.git] / doc / examples / getcpu-override / lttng-ust-getcpu-override-example.c

diff --git a/doc/examples/getcpu-override/lttng-ust-getcpu-override-example.c b/doc/examples/getcpu-override/lttng-ust-getcpu-override-example.c
new file mode 100644 (file)
index 0000000..b067beb
--- /dev/null
+++ b/doc/examples/getcpu-override/lttng-ust-getcpu-override-example.c
@@ -0,0 +1,52 @@
+/*
+ * lttng-getcpu-override-example.c
+ *
+ * Copyright (c) 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.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stdio.h>
+#include <lttng/ust-getcpu.h>
+
+static
+int plugin_getcpu(void)
+{
+       /* Dummy: always return CPU 0. */
+       return 0;
+}
+
+void lttng_ust_getcpu_plugin_init(void)
+{
+       int ret;
+
+       ret = lttng_ust_getcpu_override(plugin_getcpu);
+       if (ret) {
+               fprintf(stderr, "Error enabling getcpu override: %s\n",
+                       strerror(-ret));
+               goto error;
+       }
+       return;
+
+error:
+       exit(EXIT_FAILURE);
+}