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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2007-10-18 23:41:08 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:55 -0700
commit31155bc03e35a8d2b2551bc2eea3da5791e1b776 (patch)
tree64a82cd692af1dc3672d311f5788e2dc6a56e546 /samples/markers/marker-example.c
parent267c4025f2e198a4e551556a6db31a554ca51814 (diff)
Linux Kernel Markers - Samples
Module example showing how to use the Linux Kernel Markers. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples/markers/marker-example.c')
-rw-r--r--samples/markers/marker-example.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/samples/markers/marker-example.c b/samples/markers/marker-example.c
new file mode 100644
index 000000000000..e787c6d16dd7
--- /dev/null
+++ b/samples/markers/marker-example.c
@@ -0,0 +1,54 @@
+/* marker-example.c
+ *
+ * Executes a marker when /proc/marker-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/marker.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+
+struct proc_dir_entry *pentry_example;
+
+static int my_open(struct inode *inode, struct file *file)
+{
+ int i;
+
+ trace_mark(subsystem_event, "%d %s", 123, "example string");
+ for (i = 0; i < 10; i++)
+ trace_mark(subsystem_eventb, MARK_NOARGS);
+ return -EPERM;
+}
+
+static struct file_operations mark_ops = {
+ .open = my_open,
+};
+
+static int example_init(void)
+{
+ printk(KERN_ALERT "example init\n");
+ pentry_example = create_proc_entry("marker-example", 0444, NULL);
+ if (pentry_example)
+ pentry_example->proc_fops = &mark_ops;
+ else
+ return -EPERM;
+ return 0;
+}
+
+static void example_exit(void)
+{
+ printk(KERN_ALERT "example exit\n");
+ remove_proc_entry("marker-example", NULL);
+}
+
+module_init(example_init)
+module_exit(example_exit)
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Mathieu Desnoyers");
+MODULE_DESCRIPTION("Marker example");

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