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 16 DEFINE_TRACE(subsys_event); 17 DEFINE_TRACE(subsys_eventb); 18 19 struct proc_dir_entry *pentry_example; 20 my_open(struct inode * inode,struct file * file)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 31 static struct file_operations mark_ops = { 32 .open = my_open, 33 }; 34 example_init(void)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 example_exit(void)45static void __exit example_exit(void) 46 { 47 printk(KERN_ALERT "example exit\n"); 48 remove_proc_entry("tracepoint-example", NULL); 49 } 50 51 module_init(example_init) 52 module_exit(example_exit) 53 54 MODULE_LICENSE("GPL"); 55 MODULE_AUTHOR("Mathieu Desnoyers"); 56 MODULE_DESCRIPTION("Tracepoint example"); 57