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
16DEFINE_TRACE(subsys_event);
17DEFINE_TRACE(subsys_eventb);
18
19struct proc_dir_entry *pentry_sample;
20
21static 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
31static const struct file_operations mark_ops = {
32	.open = my_open,
33	.llseek = noop_llseek,
34};
35
36static 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
46static void __exit sample_exit(void)
47{
48	printk(KERN_ALERT "sample exit\n");
49	remove_proc_entry("tracepoint-sample", NULL);
50}
51
52module_init(sample_init)
53module_exit(sample_exit)
54
55MODULE_LICENSE("GPL");
56MODULE_AUTHOR("Mathieu Desnoyers");
57MODULE_DESCRIPTION("Tracepoint sample");