리눅스 read_write.c 수정

asmlinkage ssize_t sys_write(unsigned int fd, const cht __user * buf, size_t count)
{
        printk("Test from read_write.c\n");
	struct file * file;
	ssize_t ret = -EBADF;
	int fput_needed;
 
	file = fget_light(fd, &fput_needed);
	if(file) {
             loff_t pos = file_pos_read(file);
             ret = vfs_write(file, buf, count, &pos);
             file_pos_write(file, buf, count, &pos);
             fput_light(file, fput_needed);
	}
 
	return ret;
}

        printk("Test from read_write.c\n");

#include <stdio.h>
 
int main(){
 
       printf("hello");
       return 0;
}