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1 | /* tracepoint-sample.c |
2 | * |
3 | * Executes a tracepoint when /proc/tracepoint-sample 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/sched.h> |
13 | #include <linux/proc_fs.h> |
14 | #include "tp-samples-trace.h" |
15 | |
16 | DEFINE_TRACE(subsys_event); |
17 | DEFINE_TRACE(subsys_eventb); |
18 | |
19 | struct proc_dir_entry *pentry_sample; |
20 | |
21 | static int my_open(struct inode *inode, struct file *file) |
22 | { |
23 | int i; |
24 | |
25 | trace_subsys_event(inode, file); |
26 | for (i = 0; i < 10; i++) |
27 | trace_subsys_eventb(); |
28 | return -EPERM; |
29 | } |
30 | |
31 | static const struct file_operations mark_ops = { |
32 | .open = my_open, |
33 | .llseek = noop_llseek, |
34 | }; |
35 | |
36 | static int __init sample_init(void) |
37 | { |
38 | printk(KERN_ALERT "sample init\n"); |
39 | pentry_sample = proc_create("tracepoint-sample", 0444, NULL, |
40 | &mark_ops); |
41 | if (!pentry_sample) |
42 | return -EPERM; |
43 | return 0; |
44 | } |
45 | |
46 | static void __exit sample_exit(void) |
47 | { |
48 | printk(KERN_ALERT "sample exit\n"); |
49 | remove_proc_entry("tracepoint-sample", NULL); |
50 | } |
51 | |
52 | module_init(sample_init) |
53 | module_exit(sample_exit) |
54 | |
55 | MODULE_LICENSE("GPL"); |
56 | MODULE_AUTHOR("Mathieu Desnoyers"); |
57 | MODULE_DESCRIPTION("Tracepoint sample"); |
58 |
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