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timertest1.c
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timertest1.c
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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/timer.h>
MODULE_LICENSE("GPL");
static struct timer_list my_timer;
void my_timer_callback(unsigned long data)
{
int ret;
printk("my_timer_callback called (%ld).\n", jiffies);
ret = mod_timer(&my_timer, jiffies + msecs_to_jiffies(2000));
if(ret) printk("Error in mod_timer\n");
}
int init_module(void)
{
int ret;
printk("Timer test 1 initialising\n");
setup_timer(&my_timer, my_timer_callback, 0);
printk("Starting timer to fire in 1000ms (%ld)\n", jiffies);
ret = mod_timer(&my_timer, jiffies + msecs_to_jiffies(2000));
if(ret) printk("Error in mod_timer\n");
return 0;
}
void cleanup_module(void)
{
int ret;
ret = del_timer(&my_timer);
if(ret) printk("The timer is still in use...\n");
printk("Timer module finished\n");
return;
}