1 /* marker-example.c
2 *
3 * Executes a marker when /proc/marker-example is opened.
4 *
5 * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
6 *
7 * This file is released under the GPLv2.
8 * See the file COPYING for more details.
9 */
10
11 #include <linux/module.h>
12 #include <linux/marker.h>
13 #include <linux/sched.h>
14 #include <linux/proc_fs.h>
15
16 struct proc_dir_entry *pentry_example;
17
18 static int my_open(struct inode *inode, struct file *file)
19 {
20 int i;
21
22 trace_mark(subsystem_event, "integer %d string %s", 123,
23 "example string");
24 for (i = 0; i < 10; i++)
25 trace_mark(subsystem_eventb, MARK_NOARGS);
26 return -EPERM;
27 }
28
29 static struct file_operations mark_ops = {
30 .open = my_open,
31 };
32
33 static int __init example_init(void)
34 {
35 printk(KERN_ALERT "example init\n");
36 pentry_example = proc_create("marker-example", 0444, NULL, &mark_ops);
37 if (!pentry_example)
38 return -EPERM;
39 return 0;
40 }
41
42 static void __exit example_exit(void)
43 {
44 printk(KERN_ALERT "example exit\n");
45 remove_proc_entry("marker-example", NULL);
46 }
47
48 module_init(example_init)
49 module_exit(example_exit)
50
51 MODULE_LICENSE("GPL");
52 MODULE_AUTHOR("Mathieu Desnoyers");
53 MODULE_DESCRIPTION("Marker example");
54
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