/* tracepoint-sample.c * * Executes a tracepoint when /proc/tracepoint-sample 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/sched.h> #include <linux/proc_fs.h> #include "tp-samples-trace.h" DEFINE_TRACE(subsys_event); DEFINE_TRACE(subsys_eventb); struct proc_dir_entry *pentry_sample; static int my_open(struct inode *inode, struct file *file) { int i; trace_subsys_event(inode, file); for (i = 0; i < 10; i++) trace_subsys_eventb(); return -EPERM; } static const struct file_operations mark_ops = { .open = my_open, }; static int __init sample_init(void) { printk(KERN_ALERT "sample init\n"); pentry_sample = proc_create("tracepoint-sample", 0444, NULL, &mark_ops); if (!pentry_sample) return -EPERM; return 0; } static void __exit sample_exit(void) { printk(KERN_ALERT "sample exit\n"); remove_proc_entry("tracepoint-sample", NULL); } module_init(sample_init) module_exit(sample_exit) MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mathieu Desnoyers"); MODULE_DESCRIPTION("Tracepoint sample");