helloworld.c 代码
1 #include <linux/init.h>
2 #include <linux/module.h>
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.o
CURRENT_DIR :=$(shell pwd)
KERNEL_DIR := /usr/src/linux-headers-$(shell uname -r)
all:
$(MAKE) -C $(KERNEL_DIR) M=$(CURRENT_DIR) modules
clean:
rm -rf %.o
执行make
[email protected]:/data1/Ryan/demo/helloworld$ make make -C /usr/src/linux-headers-3.13.0-32-generic M=/data1/Ryan/demo/helloworld modules make[1]: Entering directory `/usr/src/linux-headers-3.13.0-32-generic‘ Building modules, stage 2. MODPOST 1 modules make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-32-generic‘
加载模块
1 [email protected]:/data1/Ryan/demo/helloworld$ sudo insmod helloworld.ko 2 [email protected]:/data1/Ryan/demo/helloworld$
dmesg查看
1 [email protected]:/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 [email protected]:/data1/Ryan/demo/helloworld$ sudo rmmod helloworld 2 [email protected]:/data1/Ryan/demo/helloworld$
时间： 2024-12-20 10:41:31