[질문] 모듈 프로그래밍중..

#include <linux/kernel.h>
#include <sys/syscall.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <sys/stat.h>
 
#define __NR_fileinfo   259
 
asmlinkage int(*saved_entry)(void);
void **sys_call_table=(void**)0xc030a0f0;
 
asmlinkage int sys_fileinfo(struct stat *fbuf, const char *fpath)
{
        struct stat statbuf;
        int i;
 
        i=stat(fpath, &statbuf);
 
        if(i==-1)
        {
                return -1;
        }
        copy_to_user(fbuf, &statbuf, sizeof(struct stat));
        return 0;
}
 
int module_start()
{
        saved_entry = sys_call_table[__NR_fileinfo];
        sys_call_table[__NR_fileinfo] = sys_fileinfo;
        return 0;
}
 
void module_end()
{
        sys_call_table[__NR_fileinfo] = saved_entry;
}
 
module_init(module_start);
module_exit(module_end);
 
MODULE_LICENSE("GPL");

TARGET=fileinfo
INCLUDE=-isystem /usr/src/linux-2.4.20-8/include
CFLAGS=-O2 -D__KERNEL__  -DMODULE $(INCLUDE)
CC=gcc
${TARGET}.o:${TARGET}.c
clean:
        rm -rf ${TARGET}.o