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<html><head><title>黄金书屋</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><link rel="stylesheet" href="/goldnets.css"></head><body bgcolor="#E4EBF1"><center><a href="http://ad.myrice.com/RealMedia/ads/click_nx.ads/goldnets.myrice.com/banner1@Top" target=_blanck ><script language=JavaScript><!---todayd = new Date();var seconds = todayd.getTime();document.write("<img src=\"http://ad.myrice.com/RealMedia/ads/adstream_nx.ads/goldnets.myrice.com/banner1@Top?dd=seconds\" border=0 width=468 height=60>");//--></script></a></center><br><table width="756" border="0" cellspacing="0" cellpadding="0" align="center" bgcolor="#E4EBF1"> <tr> <td colspan="2" valign="top" align="center"> <div align="center"> <table width="100%" border="0" cellspacing="0" cellpadding="0" height="52"> <tr> <td valign="top"><br> <div align="center"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td valign="bottom"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td><a href="/index.html">首页</a>>> <font color="#CC0000"><a href="/book/152/1015178.html">Linux内核编程</a></font></td> <td width="22%"> <a href="/index.html">[ 点此回首页 ]</a></td> </tr> <tr> <td colspan="2"><img src="/image/1x1.gif" width="1" height="2"></td> </tr> <tr bgcolor="#FFCC00"> <td colspan="2"><img src="/image/1x1.gif" width="1" height="1"></td> </tr> <tr> <td colspan="2"><img src="/image/1x1.gif" width="1" height="6"></td> </tr> </table> </td> </tr> </table> <br> <table width="590" border="0" cellspacing="0" cellpadding="0"> <tr> <td><center><a href='3.html'>上一页 </a>||<a href='5.html'>下一页</a></center><br><hr><div style=font-size:12pt><pre> 1.2 多文件内核模块
有些时候在几个源文件之间分出一个内核模块是很有意义的。在这种情况下，你需要
做下面的事情：
1. 在除了一个以外的所有源文件中，增加一行#define __NO_VERSION__。这是很重
要的，因为module.h一般包括kernel_version的定义，这是一个全局变量，包含模
块编译的内核版本。如果你需要version.h，你需要把自己把它包含进去，因为如果
有__NO_VERSION__的话module.h不会自动包含。
2. 象通常一样编译源文件。
3. 把所有目标文件联编成一个。在X86下，用ld –m elf_i386 –r –o <name of module>.o
<1st source file>
这里给出一个这样的内核模块的例子。
ex start.c
/* start.c
* Copyright (C) 1999 by Ori Pomerantz
*
* \"Hello, world\" - the kernel module version.
* This file includes just the start routine
*/
/* The necessary header files */
/* Standard in kernel modules */
#include <linux/kernel.h> /* We\'re doing kernel work */
#include <linux/module.h> /* Specifically, a module */
/* Deal with CONFIG_MODVERSIONS */
#if CONFIG_MODVERSIONS==1
#define MODVERSIONS
#include <linux/modversions.h>
#endif
/* Initialize the module */
int init_module()
{
printk(\"Hello, world - this is the kernel speaking\\n\");
/* If we return a non zero value, it means that
* init_module failed and the kernel module
* can\'t be loaded */
return 0;
}
ex stop.c
/* stop.c
* Copyright (C) 1999 by Ori Pomerantz
*
* \"Hello, world\" - the kernel module version. This
* file includes just the stop routine.
*/
/* The necessary header files */
/* Standard in kernel modules */
#include <linux/kernel.h> /* We\'re doing kernel work */
#define __NO_VERSION__ /* This isn\'t \"the\" file
* of the kernel module */
#include <linux/module.h> /* Specifically, a module */
#include <linux/version.h> /* Not included by
* module.h because
* of the __NO_VERSION__ */
/* Deal with CONFIG_MODVERSIONS */
#if CONFIG_MODVERSIONS==1
#define MODVERSIONS
#include <linux/modversions.h>
#endif
/* Cleanup - undid whatever init_module did */
void cleanup_module()
{
printk(\"Short is the life of a kernel module\\n\");
}
ex Makefile
# Makefile for a multifile kernel module
CC=gcc
MODCFLAGS := -Wall -DMODULE -D__KERNEL__ -DLINUX
hello.o: start.o stop.o
ld -m elf_i386 -r -o hello.o start.o stop.o
start.o: start.c /usr/include/linux/version.h
$(CC) $(MODCFLAGS) -c start.c
stop.o: stop.c /usr/include/linux/version.h
$(CC) $(MODCFLAGS) -c stop.c
</pre><hr><br><center><a href='3.html'>上一页 </a>||<a href='5.html'>下一页</a></center></div> </td> </tr> </table> <p> </p> </div> </td> </tr> </table> <br> <table border="0" width="75%"><tr><td align="right"><a href="/"><img src="/image2/logo_bottom.gif" border="0"></a></td></tr></table> <hr size="1" align="center" color="#eecccc"> <br> </div> </div> </td> </tr></table> <center><a href="http://ad.myrice.com/RealMedia/ads/click_nx.ads/goldnets.myrice.com/banner1@Bottom" target=_blanck ><script language=JavaScript><!---todayd = new Date();var seconds = todayd.getTime();document.write("<img src=\"http://ad.myrice.com/RealMedia/ads/adstream_nx.ads/goldnets.myrice.com/banner1@Bottom?dd=seconds\" border=0 width=468 height=60>");//--></script></a></center></body></html>⌨️ 快捷键说明
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