58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/* tracepoint-sample.c
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*
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* Executes a tracepoint when /proc/tracepoint-sample is opened.
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*
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* (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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*
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* This file is released under the GPLv2.
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* See the file COPYING for more details.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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#include "tp-samples-trace.h"
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DEFINE_TRACE(subsys_event);
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DEFINE_TRACE(subsys_eventb);
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struct proc_dir_entry *pentry_sample;
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static int my_open(struct inode *inode, struct file *file)
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{
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int i;
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trace_subsys_event(inode, file);
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for (i = 0; i < 10; i++)
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trace_subsys_eventb();
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return -EPERM;
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}
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static const struct file_operations mark_ops = {
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.open = my_open,
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.llseek = noop_llseek,
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};
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static int __init sample_init(void)
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{
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printk(KERN_ALERT "sample init\n");
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pentry_sample = proc_create("tracepoint-sample", 0444, NULL,
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&mark_ops);
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if (!pentry_sample)
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return -EPERM;
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return 0;
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}
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static void __exit sample_exit(void)
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{
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printk(KERN_ALERT "sample exit\n");
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remove_proc_entry("tracepoint-sample", NULL);
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}
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module_init(sample_init)
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module_exit(sample_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mathieu Desnoyers");
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MODULE_DESCRIPTION("Tracepoint sample");
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