tracing: tracepoints, samples

[safe/jmp/linux-2.6] / samples / tracepoints / tracepoint-sample.c

diff --git a/samples/tracepoints/tracepoint-sample.c b/samples/tracepoints/tracepoint-sample.c
new file mode 100644 (file)
index 0000000..4ae4b7f
--- /dev/null
+++ b/samples/tracepoints/tracepoint-sample.c
@@ -0,0 +1,53 @@
+/* tracepoint-sample.c
+ *
+ * Executes a tracepoint when /proc/tracepoint-example is opened.
+ *
+ * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include "tp-samples-trace.h"
+
+struct proc_dir_entry *pentry_example;
+
+static int my_open(struct inode *inode, struct file *file)
+{
+       int i;
+
+       trace_subsys_event(inode, file);
+       for (i = 0; i < 10; i++)
+               trace_subsys_eventb();
+       return -EPERM;
+}
+
+static struct file_operations mark_ops = {
+       .open = my_open,
+};
+
+static int example_init(void)
+{
+       printk(KERN_ALERT "example init\n");
+       pentry_example = proc_create("tracepoint-example", 0444, NULL,
+               &mark_ops);
+       if (!pentry_example)
+               return -EPERM;
+       return 0;
+}
+
+static void example_exit(void)
+{
+       printk(KERN_ALERT "example exit\n");
+       remove_proc_entry("tracepoint-example", NULL);
+}
+
+module_init(example_init)
+module_exit(example_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Tracepoint example");