linux-kernel - reg: kprobe method

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Message-ID: <2bd9ebfa0705310535j412f11f4tfd2b44a5a4d04cfc@mail.gmail.com>
Date:	Thu, 31 May 2007 18:05:34 +0530
From:	"Tej Parkash" <tejparkash.d@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: reg: kprobe method

hi all

there is some problem in adding simple printk using kprobe method

i m posting the my code anybody can suggest how to make it work

#include<linux/kernel.h>
#include<linux/version.h>
#include<linux/module.h>
#include<linux/init.h>
#include<linux/kprobes.h>
#include<linux/kallsyms.h>

MODULE_AUTHOR("TEJ");
MODULE_LICENSE("GPL");
//MODULE_PARM(int,val,I_IRUGO);

struct kprobe kp;
static int handler_pre(struct kprobe *p, struct pt_regs *regs)
{
 printk("my name is tej parkash dhiman");
        return 0;
}


void handler_post(struct kprobe *p, struct pt_regs *regs, unsigned long flags)
{
        printk("mast hai na tej ash ker");
}

static int init_mod(void)
{

struct kprobe kp;
kp.post_handler=handler_post;
kp.pre_handler=handler_pre;

kp.addr = (kprobe_opcode_t *) 0xc0278e50; //add for __sock_create

if(kp.addr== NULL) {
                printk("kallsyms_lookup_name could not find address
for the specified symbol name\n");
                return 0;
                    }

register_kprobe(&kp);
printk("Module is inserted");
return 0;
}
void exit_mod(void)
{
unregister_kprobe(&kp);
printk("module is removed");
}
module_init(init_mod);
module_exit(exit_mod);

thanks
TEJ
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