[lttv.git] / trunk / tests / kernel / marker-example.c

/* 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 = NULL;

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("Linux Trace Toolkit example");
Commit	Line	Data
d06fc4d5	1	/* marker-example.c
	2	*
	3	* Executes a marker when /proc/marker-example 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/marker.h>
	13	#include <linux/sched.h>
	14	#include <linux/proc_fs.h>
	15
	16	struct proc_dir_entry *pentry_example = NULL;
	17
	18	static int my_open(struct inode inode, struct file file)
	19	{
	20	int i;
	21
421991b0	22	trace_mark(subsystem_event, "%d %s", 123, "example string");
d06fc4d5	23	for (i=0; i<10; i++) {
421991b0	24	trace_mark(subsystem_eventb, MARK_NOARGS);
d06fc4d5	25	}
	26	return -EPERM;
	27	}
	28
	29	static struct file_operations mark_ops = {
	30	.open = my_open,
	31	};
	32
	33	static int example_init(void)
	34	{
	35	printk(KERN_ALERT "example init\n");
	36	pentry_example = create_proc_entry("marker-example", 0444, NULL);
	37	if (pentry_example)
	38	pentry_example->proc_fops = &mark_ops;
	39	else
	40	return -EPERM;
	41	return 0;
	42	}
	43
	44	static void example_exit(void)
	45	{
	46	printk(KERN_ALERT "example exit\n");
	47	remove_proc_entry("marker-example", NULL);
	48	}
	49
	50	module_init(example_init)
	51	module_exit(example_exit)
	52
	53	MODULE_LICENSE("GPL");
	54	MODULE_AUTHOR("Mathieu Desnoyers");
	55	MODULE_DESCRIPTION("Linux Trace Toolkit example");