| /* 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"); |