helloworld.c 代码

1 #include 
     
       2 #include 
      
        3  4 MODULE_LICENSE("Dual BSD/GPL"); 5  6 static int hello_init(void) 7 { 8 printk(KERN_ALERT "Hello world\n"); 9 return 0;10 }11 12 static void hello_exit(void)13 {14 printk(KERN_ALERT "goodbye,cruel world\n");15 }16 17 module_init(hello_init);18 module_exit(hello_exit);
      
     

 

Makefile 代码

obj-m := helloworld.oCURRENT_DIR :=$(shell pwd)KERNEL_DIR := /usr/src/linux-headers-$(shell uname -r)all:        $(MAKE) -C $(KERNEL_DIR) M=$(CURRENT_DIR) modulesclean:        rm -rf %.o

执行make

ryan@Ryan-pc:/data1/Ryan/demo/helloworld$ make make -C /usr/src/linux-headers-3.13.0-32-generic  M=/data1/Ryan/demo/helloworld modulesmake[1]: Entering directory `/usr/src/linux-headers-3.13.0-32-generic'  Building modules, stage 2.  MODPOST 1 modulesmake[1]: Leaving directory `/usr/src/linux-headers-3.13.0-32-generic'

 

加载模块

1 ryan@Ryan-pc:/data1/Ryan/demo/helloworld$ sudo insmod helloworld.ko 2 ryan@Ryan-pc:/data1/Ryan/demo/helloworld$

dmesg查看

1 ryan@Ryan-pc:/data1/Ryan/demo/helloworld$ dmesg[178401.813566] sr 0:0:0:0: [sr0] Device not ready[178401.813570] sr 0:0:0:0: [sr0]  [178401.813571] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE[178401.813572] sr 0:0:0:0: [sr0]  [178401.813573] Sense Key : Not Ready [current] [178401.813575] sr 0:0:0:0: [sr0]  [178401.813577] Add. Sense: Medium not present - tray closed[178401.813579] sr 0:0:0:0: [sr0] CDB: [178401.813580] Read(10): 28 00 00 00 02 2f 00 00 01 00[178401.813584] end_request: I/O error, dev sr0, sector 2236[179614.794066] helloworld: module verification failed: signature and/or  required key missing - tainting kernel[179614.794552] Hello world[180458.268623] goodbye,cruel world[180514.941519] Hello world[180549.136795] goodbye,cruel world[181244.193514] Hello world

卸载模块

1 ryan@Ryan-pc:/data1/Ryan/demo/helloworld$ sudo rmmod helloworld 2 ryan@Ryan-pc:/data1/Ryan/demo/helloworld$