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/* -*- linux-c -*-
* Systemtap Test Module 1
* Copyright (C) 2007 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
/*
* The purpose of this module is to provide a function that can be
* triggered from user context via a /proc file. Systemtap scripts
* set probes on the function and run tests to see if the expected
* output is received. This is better than using the kernel's modules
* because kernel internals frequently change.
*/
/************ Below are the functions to create this module ************/
struct timer_list simple_timer;
static const int timer_interval = 5;
static void simple_timer_function(struct timer_list *timer)
{
static int count;
mod_timer (&simple_timer, jiffies + ( msecs_to_jiffies(timer_interval)));
if (count) {
count = 0;
}
else {
count = 1;
}
}
int init_module(void)
{
timer_setup (&simple_timer, simple_timer_function,0);
mod_timer (&simple_timer, jiffies + msecs_to_jiffies(timer_interval));
return 0;
}
void cleanup_module(void)
{
del_timer (&simple_timer);
}
MODULE_DESCRIPTION("systemtap test module");
MODULE_LICENSE("GPL");
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