31155bc03e
Module example showing how to use the Linux Kernel Markers. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/* marker-example.c
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*
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* Executes a marker when /proc/marker-example 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/marker.h>
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#include <linux/sched.h>
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#include <linux/proc_fs.h>
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struct proc_dir_entry *pentry_example;
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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_mark(subsystem_event, "%d %s", 123, "example string");
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for (i = 0; i < 10; i++)
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trace_mark(subsystem_eventb, MARK_NOARGS);
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return -EPERM;
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}
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static struct file_operations mark_ops = {
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.open = my_open,
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};
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static int example_init(void)
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{
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printk(KERN_ALERT "example init\n");
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pentry_example = create_proc_entry("marker-example", 0444, NULL);
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if (pentry_example)
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pentry_example->proc_fops = &mark_ops;
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else
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return -EPERM;
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return 0;
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}
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static void example_exit(void)
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{
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printk(KERN_ALERT "example exit\n");
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remove_proc_entry("marker-example", NULL);
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}
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module_init(example_init)
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module_exit(example_exit)
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mathieu Desnoyers");
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MODULE_DESCRIPTION("Marker example");
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