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/* marker-example.c
*
* Executes a marker when /proc/marker-example 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/marker.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
struct proc_dir_entry *pentry_example;
static int my_open(struct inode *inode, struct file *file)
{
int i;
trace_mark(subsystem_event, "%d %s", 123, "example string");
for (i = 0; i < 10; i++)
trace_mark(subsystem_eventb, MARK_NOARGS);
return -EPERM;
}
static struct file_operations mark_ops = {
.open = my_open,
};
static int example_init(void)
{
printk(KERN_ALERT "example init\n");
pentry_example = create_proc_entry("marker-example", 0444, NULL);
if (pentry_example)
pentry_example->proc_fops = &mark_ops;
else
return -EPERM;
return 0;
}
static void example_exit(void)
{
printk(KERN_ALERT "example exit\n");
remove_proc_entry("marker-example", NULL);
}
module_init(example_init)
module_exit(example_exit)
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Marker example");
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