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31155bc0 MD |
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 | ||
cc9f2f8f MD |
22 | trace_mark(subsystem_event, "integer %d string %s", 123, |
23 | "example string"); | |
31155bc0 MD |
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 example_init(void) | |
34 | { | |
35 | printk(KERN_ALERT "example init\n"); | |
36 | pentry_example = create_proc_entry("marker-example", 0444, NULL); | |
37 | if (pentry_example) | |
38 | pentry_example->proc_fops = &mark_ops; | |
39 | else | |
40 | return -EPERM; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static void example_exit(void) | |
45 | { | |
46 | printk(KERN_ALERT "example exit\n"); | |
47 | remove_proc_entry("marker-example", NULL); | |
48 | } | |
49 | ||
50 | module_init(example_init) | |
51 | module_exit(example_exit) | |
52 | ||
53 | MODULE_LICENSE("GPL"); | |
54 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
55 | MODULE_DESCRIPTION("Marker example"); |