d06fc4d5 |
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 = NULL; |
17 | |
18 | static int my_open(struct inode *inode, struct file *file) |
19 | { |
20 | int i; |
21 | |
22 | MARK(subsystem_event, "%d %s %*.*r", 123, "example string", |
23 | sizeof(current), __alignof__(current), current); |
24 | for (i=0; i<10; i++) { |
25 | MARK(subsystem_eventb, MARK_NOARGS); |
26 | } |
27 | return -EPERM; |
28 | } |
29 | |
30 | static struct file_operations mark_ops = { |
31 | .open = my_open, |
32 | }; |
33 | |
34 | static int example_init(void) |
35 | { |
36 | printk(KERN_ALERT "example init\n"); |
37 | pentry_example = create_proc_entry("marker-example", 0444, NULL); |
38 | if (pentry_example) |
39 | pentry_example->proc_fops = &mark_ops; |
40 | else |
41 | return -EPERM; |
42 | return 0; |
43 | } |
44 | |
45 | static void example_exit(void) |
46 | { |
47 | printk(KERN_ALERT "example exit\n"); |
48 | remove_proc_entry("marker-example", NULL); |
49 | } |
50 | |
51 | module_init(example_init) |
52 | module_exit(example_exit) |
53 | |
54 | MODULE_LICENSE("GPL"); |
55 | MODULE_AUTHOR("Mathieu Desnoyers"); |
56 | MODULE_DESCRIPTION("Linux Trace Toolkit example"); |