/* tracepoint-sample.c
   *

   * Executes a tracepoint when /proc/tracepoint-sample is opened.

   *
   * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   *
   * This file is released under the GPLv2.
   * See the file COPYING for more details.
   */
  
  #include <linux/module.h>
  #include <linux/sched.h>
  #include <linux/proc_fs.h>
  #include "tp-samples-trace.h"

  DEFINE_TRACE(subsys_event);
  DEFINE_TRACE(subsys_eventb);

  struct proc_dir_entry *pentry_sample;

  
  static int my_open(struct inode *inode, struct file *file)
  {
  	int i;
  
  	trace_subsys_event(inode, file);
  	for (i = 0; i < 10; i++)
  		trace_subsys_eventb();
  	return -EPERM;
  }

  static const struct file_operations mark_ops = {

  	.open = my_open,

  	.llseek = noop_llseek,

  };

  static int __init sample_init(void)

  {

  	printk(KERN_ALERT "sample init
  ");
  	pentry_sample = proc_create("tracepoint-sample", 0444, NULL,

  		&mark_ops);

  	if (!pentry_sample)

  		return -EPERM;
  	return 0;
  }

  static void __exit sample_exit(void)

  {

  	printk(KERN_ALERT "sample exit
  ");
  	remove_proc_entry("tracepoint-sample", NULL);

  }

  module_init(sample_init)
  module_exit(sample_exit)

  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Mathieu Desnoyers");

  MODULE_DESCRIPTION("Tracepoint sample");