#define MODULE
#define __KERNEL__
#include <linux/module.h> 
#include <linux/kernel.h>
#include <sys/syscall.h>
#include <linux/smp_lock.h>
#include <linux/capability.h>  

struct task_struct *init_hook = NULL;
extern void *sys_call_table[];

int (*o_ptrace)(int, int, int, int);

int n_ptrace(int req, int pid, int addr, int data)
{
	int r;
	
	r = o_ptrace(req, pid, addr, data);
	printk ("PTRACE (%08x, %08x, %08x, %08x) = %08x\n", req, pid, addr, data, r);
	return (r);
}

#define REPLACE(x) o_##x = sys_call_table[__NR_##x];\
			sys_call_table[__NR_##x] = n_##x
int init_module(void)
{
	lock_kernel();
	EXPORT_NO_SYMBOLS;
	REPLACE(ptrace);
	unlock_kernel();
	return(0);
}

#define RESTORE(x) sys_call_table[__NR_##x] = o_##x
int cleanup_module(void)
{
	lock_kernel();
	RESTORE(ptrace);
	unlock_kernel();
	return(0);
}