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<p><FONT class=normalfont><B><font color=blue>代码例子</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>[目录]<br>
<br>
--------------------------------------------------------------------------------<br>
<br>
<br>
header.c<br>
<br>
/***********************************************************************<br>
Case study source code from the book `The linux A to Z'<br>
by Phil Cornes. Published by Prentice Hall, 1996.<br>
Copyright (C) 1996 Phil Cornes<br>
This program is free software; you can redistribute it and/or modify<br>
it under the terms of the GNU General Public License as published by<br>
the Free Software Foundation; either version 2 of the License, or<br>
(at your option) any later version.<br>
<br>
This program is distributed in the hope that it will be useful,<br>
but WITHOUT ANY WARRANTY; without even the implied warranty of<br>
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the<br>
GNU General Public License for more details.<br>
<br>
You should have received a copy of the GNU General Public License<br>
along with this program; if not, write to the Free Software<br>
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.<br>
***********************************************************************/<br>
<br>
/* 1 */<br>
#define KERNEL<br>
<br>
#include <linux/kernel.h><br>
#include <linux/sched.h><br>
#include <linux/tty.h><br>
#include <linux/signal.h><br>
#include <linux/errno.h><br>
#include <linux/malloc.h><br>
<br>
#include <asm/io.h><br>
#include <asm/segment.h><br>
#include <asm/system.h><br>
#include <asm/irq.h><br>
<br>
#include "tdd.h"<br>
<br>
/* 2 */<br>
static int tdd_trace;<br>
static int write_busy;<br>
static int read_busy;<br>
static struct tdd_buf *qhead;<br>
static struct tdd_buf *qtail;<br>
<br>
/* 3 */<br>
static int tdd_read(struct inode *, struct file *, char *, int);<br>
static int tdd_write(struct inode *, struct file *, char *, int);<br>
static int tdd_ioctl(struct inode *, struct file *, unsigned int,<br>
unsigned long);<br>
static int tdd_open(struct inode *, struct file *);<br>
static void tdd_release(struct inode *, struct file *);<br>
extern void console_print(char *);<br>
<br>
struct file_operations tdd_fops =<br>
{<br>
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