c – 制作简单的linux内核模块

发布时间：2020-12-16 07:10:55 所属栏目：百科来源：网络整理

导读：我正在尝试升级我的守护进程代码,以便它不是一个可执行文件,它将是一个内核模块,但即使使用一个简单的例子我也很困难. 这是我试过的代码： #include linux/module.h#include linux/kernel.hint init_module(void){ printk("Hello world 1.n"); return 0;}vo

我正在尝试升级我的守护进程代码,以便它不是一个可执行文件,它将是一个内核模块,但即使使用一个简单的例子我也很困难.

这是我试过的代码：

#include <linux/module.h>
#include <linux/kernel.h>

int init_module(void){
   printk("Hello world 1.n");
   return 0;
}

void cleanup_module(void){
  printk(KERN_ALERT "Goodbye world 1.n");
}

因为我知道我不能直接编译代码,所以我采取了一种方法来复制并稍微修改makefile,如下所示：

WARN    := -W -Wall -Wstrict-prototypes -Wmissing-prototypes
INCLUDE := -isystem /lib/modules/`uname -r`/build/include
CFLAGS  := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE}
CC      := gcc
OBJS    := ${patsubst %.c,%.o,${wildcard *.c}}

all: ${OBJS}

然后在命令行上执行“make”,期望安装程序：

这是我的输出：

gcc -O2 -DMODULE -D__KERNEL__ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include   -c -o d.o d.c
    In file included from /lib/modules/2.6.21.5-smp/build/include/asm/thread_info.h:16,from /lib/modules/2.6.21.5-smp/build/include/linux/thread_info.h:21,from /lib/modules/2.6.21.5-smp/build/include/linux/preempt.h:9,from /lib/modules/2.6.21.5-smp/build/include/linux/spinlock.h:49,from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:9,from d.c:1:
    /lib/modules/2.6.21.5-smp/build/include/asm/processor.h:82: error: 'CONFIG_X86_L1_CACHE_SHIFT' undeclared here (not in a function)
    /lib/modules/2.6.21.5-smp/build/include/asm/processor.h:82: error: requested alignment is not a constant
    In file included from /lib/modules/2.6.21.5-smp/build/include/linux/sched.h:51,from /lib/modules/2.6.21.5-smp/build/include/linux/utsname.h:35,from /lib/modules/2.6.21.5-smp/build/include/asm/elf.h:12,from /lib/modules/2.6.21.5-smp/build/include/linux/elf.h:7,from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:15,from d.c:1:
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:33:3: error: #error You lose.
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    /lib/modules/2.6.21.5-smp/build/include/linux/jiffies.h:225:31: error: division by zero in #if
    In file included from /lib/modules/2.6.21.5-smp/build/include/linux/module.h:21,from d.c:1:
    /lib/modules/2.6.21.5-smp/build/include/asm/module.h:62:2: error: #error unknown processor family
    make: *** [d.o] Error 1

当我只处理两个记录良好的函数时,为什么要得到所有这些错误？我的makefile关闭了吗？请指教？

解决方法

没关系.我发现自己得到了答案：

https://www.kernel.org/doc/Documentation/kbuild/modules.txt

它指出：

To build against the running kernel use:

    $make -C /lib/modules/`uname -r`/build M=$PWD

    Then to install the module(s) just built,add the target
"modules_install" to the command:

    $make -C /lib/modules/`uname -r`/build M=$PWD modules_install

（编辑：李大同）

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