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}; 34 35static int __init sample_init(void) 36{ 37 printk(KERN_ALERT "sample init\n"); 38 pentry_sample = proc_create("tracepoint-sample", 0444, NULL, 39 &mark_ops); 40 if (!pentry_sample) 41 return -EPERM; 42 return 0; 43} 44 45static void __exit sample_exit(void) 46{ 47 printk(KERN_ALERT "sample exit\n"); 48 remove_proc_entry("tracepoint-sample", NULL); 49} 50 51module_init(sample_init) 52module_exit(sample_exit) 53 54MODULE_LICENSE("GPL"); 55MODULE_AUTHOR("Mathieu Desnoyers"); 56MODULE_DESCRIPTION("Tracepoint sample"); 57