tracepoint-probe-sample2.c

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/*
 * tracepoint-probe-sample2.c
 *
 * 2nd sample tracepoint probes.
 */

#include <linux/module.h>
#include <linux/fs.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(void *ignore,
                   struct inode *inode, struct file *file)
{
    printk(KERN_INFO "Event is encountered with inode number %lu\n",
        inode->i_ino);
}

static int __init tp_sample_trace_init(void)
{
    int ret;

    ret = register_trace_subsys_event(probe_subsys_event, NULL);
    WARN_ON(ret);

    return 0;
}

module_init(tp_sample_trace_init);

static void __exit tp_sample_trace_exit(void)
{
    unregister_trace_subsys_event(probe_subsys_event, NULL);
    tracepoint_synchronize_unregister();
}

module_exit(tp_sample_trace_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mathieu Desnoyers");
MODULE_DESCRIPTION("Tracepoint Probes Samples");