linux简单的hello模块实现

hello.c

/* hello.c */ #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("tang"); static int hello_init(void) {     printk(KERN_ALERT "Hello, world/n");     return 0; } static void hello_exit(void) {     printk(KERN_ALERT "Goodbye, hello/n"); } module_init(hello_init); module_exit(hello_exit); Makefile

/* Makefile*/ PWD := $(shell pwd) KVER := $(shell uname -r) KDIR := /lib/modules/$(KVER)/build obj-m:=hello.o all :     $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) .PHONY : clean clean :     rm -rf .*.cmd *.mod.c *.o *.ko .tmp_versions

 

输入命令

 

make

root@ubuntu:/home/tang/ty/hello# make make -C /lib/modules/2.6.32-29-generic/build SUBDIRS=/home/tang/ty/hello make[1]: Entering directory `/usr/src/linux-headers-2.6.32-29-generic'   CC [M]  /home/tang/ty/hello/hello.o   Building modules, stage 2.   MODPOST 1 modules   CC      /home/tang/ty/hello/hello.mod.o   LD [M]  /home/tang/ty/hello/hello.ko make[1]: Leaving directory `/usr/src/linux-headers-2.6.32-29-generic'

利用insmod加载helloworld模块

 

insmod hello. ko

 

利用lsmod命令查看已加载模块

lsmod | grep hello

显示：

hello                    680  0

 

通过rmmod命令，将helloworld模块从内核中移走

 

rmmod hello. ko

 

再次查看

 

lsmod | grep hello