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Mathieu Desnoyers4a089752008-07-18 12:16:16 -04001/* tracepoint-sample.c
2 *
Jody McIntyre0a5d6492009-03-24 16:00:28 -04003 * Executes a tracepoint when /proc/tracepoint-sample is opened.
Mathieu Desnoyers4a089752008-07-18 12:16:16 -04004 *
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
Mathieu Desnoyers7e066fb2008-11-14 17:47:47 -050016DEFINE_TRACE(subsys_event);
17DEFINE_TRACE(subsys_eventb);
18
Jody McIntyre0a5d6492009-03-24 16:00:28 -040019struct proc_dir_entry *pentry_sample;
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040020
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 struct file_operations mark_ops = {
32 .open = my_open,
33};
34
Jody McIntyre0a5d6492009-03-24 16:00:28 -040035static int __init sample_init(void)
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040036{
Jody McIntyre0a5d6492009-03-24 16:00:28 -040037 printk(KERN_ALERT "sample init\n");
38 pentry_sample = proc_create("tracepoint-sample", 0444, NULL,
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040039 &mark_ops);
Jody McIntyre0a5d6492009-03-24 16:00:28 -040040 if (!pentry_sample)
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040041 return -EPERM;
42 return 0;
43}
44
Jody McIntyre0a5d6492009-03-24 16:00:28 -040045static void __exit sample_exit(void)
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040046{
Jody McIntyre0a5d6492009-03-24 16:00:28 -040047 printk(KERN_ALERT "sample exit\n");
48 remove_proc_entry("tracepoint-sample", NULL);
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040049}
50
Jody McIntyre0a5d6492009-03-24 16:00:28 -040051module_init(sample_init)
52module_exit(sample_exit)
Mathieu Desnoyers4a089752008-07-18 12:16:16 -040053
54MODULE_LICENSE("GPL");
55MODULE_AUTHOR("Mathieu Desnoyers");
Jody McIntyre0a5d6492009-03-24 16:00:28 -040056MODULE_DESCRIPTION("Tracepoint sample");