Commit | Line | Data |
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4a089752 MD |
1 | /* tracepoint-sample.c |
2 | * | |
0a5d6490 | 3 | * Executes a tracepoint when /proc/tracepoint-sample is opened. |
4a089752 MD |
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 | ||
7e066fb8 MD |
16 | DEFINE_TRACE(subsys_event); |
17 | DEFINE_TRACE(subsys_eventb); | |
18 | ||
0a5d6490 | 19 | struct proc_dir_entry *pentry_sample; |
4a089752 MD |
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 | ||
828c0950 | 31 | static const struct file_operations mark_ops = { |
4a089752 | 32 | .open = my_open, |
6038f373 | 33 | .llseek = noop_llseek, |
4a089752 MD |
34 | }; |
35 | ||
0a5d6490 | 36 | static int __init sample_init(void) |
4a089752 | 37 | { |
0a5d6490 JM |
38 | printk(KERN_ALERT "sample init\n"); |
39 | pentry_sample = proc_create("tracepoint-sample", 0444, NULL, | |
4a089752 | 40 | &mark_ops); |
0a5d6490 | 41 | if (!pentry_sample) |
4a089752 MD |
42 | return -EPERM; |
43 | return 0; | |
44 | } | |
45 | ||
0a5d6490 | 46 | static void __exit sample_exit(void) |
4a089752 | 47 | { |
0a5d6490 JM |
48 | printk(KERN_ALERT "sample exit\n"); |
49 | remove_proc_entry("tracepoint-sample", NULL); | |
4a089752 MD |
50 | } |
51 | ||
0a5d6490 JM |
52 | module_init(sample_init) |
53 | module_exit(sample_exit) | |
4a089752 MD |
54 | |
55 | MODULE_LICENSE("GPL"); | |
56 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
0a5d6490 | 57 | MODULE_DESCRIPTION("Tracepoint sample"); |