Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* tracepoint-sample.c
2 *
3 * Executes a tracepoint when /proc/tracepoint-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/sched.h>
13#include <linux/proc_fs.h>
14#include "tp-samples-trace.h"
15
16struct proc_dir_entry *pentry_example;
17
18static int my_open(struct inode *inode, struct file *file)
19{
20 int i;
21
22 trace_subsys_event(inode, file);
23 for (i = 0; i < 10; i++)
24 trace_subsys_eventb();
25 return -EPERM;
26}
27
28static struct file_operations mark_ops = {
29 .open = my_open,
30};
31
32static int example_init(void)
33{
34 printk(KERN_ALERT "example init\n");
35 pentry_example = proc_create("tracepoint-example", 0444, NULL,
36 &mark_ops);
37 if (!pentry_example)
38 return -EPERM;
39 return 0;
40}
41
42static void example_exit(void)
43{
44 printk(KERN_ALERT "example exit\n");
45 remove_proc_entry("tracepoint-example", NULL);
46}
47
48module_init(example_init)
49module_exit(example_exit)
50
51MODULE_LICENSE("GPL");
52MODULE_AUTHOR("Mathieu Desnoyers");
53MODULE_DESCRIPTION("Tracepoint example");