LXR linux/samples/tracepoints/tracepoint-sample.c

   1/* tracepoint-sample.c
   2 *
   3 * Executes a tracepoint when /proc/tracepoint-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/sched.h>
  13#include <linux/proc_fs.h>
  14#include "tp-samples-trace.h"
  15
  16DEFINE_TRACE(subsys_event);
  17DEFINE_TRACE(subsys_eventb);
  18
  19struct proc_dir_entry *pentry_example;
  20
  21static int my_open(struct inode *inode, struct file *file)
  22{
  23        int i;
  24
  25        trace_subsys_event(inode, file);
  26        for (i = 0; i < 10; i++)
  27                trace_subsys_eventb();
  28        return -EPERM;
  29}
  30
  31static struct file_operations mark_ops = {
  32        .open = my_open,
  33};
  34
  35static int __init example_init(void)
  36{
  37        printk(KERN_ALERT "example init\n");
  38        pentry_example = proc_create("tracepoint-example", 0444, NULL,
  39                &mark_ops);
  40        if (!pentry_example)
  41                return -EPERM;
  42        return 0;
  43}
  44
  45static void __exit example_exit(void)
  46{
  47        printk(KERN_ALERT "example exit\n");
  48        remove_proc_entry("tracepoint-example", NULL);
  49}
  50
  51module_init(example_init)
  52module_exit(example_exit)
  53
  54MODULE_LICENSE("GPL");
  55MODULE_AUTHOR("Mathieu Desnoyers");
  56MODULE_DESCRIPTION("Tracepoint example");
  57