/* * tracepoint-probe-sample.c * * sample tracepoint probes. */ #include <linux/module.h> #include <linux/file.h> #include <linux/dcache.h> #include "tp-samples-trace.h" /* * Here the caller only guarantees locking for struct file and struct inode. * Locking must therefore be done in the probe to use the dentry. */ static void probe_subsys_event(struct inode *inode, struct file *file) { path_get(&file->f_path); dget(file->f_path.dentry); printk(KERN_INFO "Event is encountered with filename %s\n", file->f_path.dentry->d_name.name); dput(file->f_path.dentry); path_put(&file->f_path); } static void probe_subsys_eventb(void) { printk(KERN_INFO "Event B is encountered\n"); } static int __init tp_sample_trace_init(void) { int ret; ret = register_trace_subsys_event(probe_subsys_event); WARN_ON(ret); ret = register_trace_subsys_eventb(probe_subsys_eventb); WARN_ON(ret); return 0; } module_init(tp_sample_trace_init); static void __exit tp_sample_trace_exit(void) { unregister_trace_subsys_eventb(probe_subsys_eventb); unregister_trace_subsys_event(probe_subsys_event); tracepoint_synchronize_unregister(); } module_exit(tp_sample_trace_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Mathieu Desnoyers"); MODULE_DESCRIPTION("Tracepoint Probes Samples");