Mathieu Desnoyers | 4a08975 | 2008-07-18 12:16:16 -0400 | [diff] [blame] | 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 | |
| 16 | struct proc_dir_entry *pentry_example; |
| 17 | |
| 18 | static 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 | |
| 28 | static struct file_operations mark_ops = { |
| 29 | .open = my_open, |
| 30 | }; |
| 31 | |
| 32 | static 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 | |
| 42 | static void example_exit(void) |
| 43 | { |
| 44 | printk(KERN_ALERT "example exit\n"); |
| 45 | remove_proc_entry("tracepoint-example", NULL); |
| 46 | } |
| 47 | |
| 48 | module_init(example_init) |
| 49 | module_exit(example_exit) |
| 50 | |
| 51 | MODULE_LICENSE("GPL"); |
| 52 | MODULE_AUTHOR("Mathieu Desnoyers"); |
| 53 | MODULE_DESCRIPTION("Tracepoint example"); |