2010嵌入式作业---6---冯伟浩-----吴晓培
[root@bogon I21c]# gedit lb.c
#include
#include
#include
#include
MODULE_LICENSE("GPL");
MODULE_AUTHOR("XIYOU");
#define N 10 //链表节点
struct numlist {
int num;//数据
struct list_head list;//指向双联表前后节点的指针
};
struct numlist numhead;//头节点
static int __init doublelist_init(void)
{
//初始化头节点
struct numlist *listnode;//每次申请链表节点时所用的指针
struct list_head *pos; //定义list_head的有效指针
struct numlist *p;
int i;
printk("<0>""doublelist is starting...\n");//利用"<0>"提升printk级别
INIT_LIST_HEAD(&numhead.list);
printk("初始化头节点");
//建立N个节点，依次加入到链表当中
for (i = 0; i < N; i++) {
listnode = (struct numlist *)kmalloc(sizeof(struct numlist), GFP_KERNEL); // kmalloc（）在内核空间申请内存，用于存放结点。
listnode->num = i+1;//给链表numlist的数据域赋值。
list_add_tail(&listnode->list, &numhead.list);//将结点加入到链表尾部
printk("<0>""Node %d has added to the doublelist...\n", i+1);
}
printk("<0>""建立N个节点，依次加入到链表当中");
printk("<0>""遍历链表");
//遍历链表
i = 1;
list_for_each(pos, &numhead.list) {
p = list_entry(pos, struct numlist, list);
printk("<0>""Node %d's data:%d\n", i, p->num);
i++;
}
return 0;
}
static void __exit doublelist_exit(void)
{
struct list_head *pos, *n;
struct numlist *p;
int i;
printk("<0>""依次删除N个节点\n");
//依次删除N个节点
i = 1;
list_for_each_safe(pos, n, &numhead.list) { //为了安全删除节点而进行的遍历
list_del(pos);//从双链表中删除当前节点
p = list_entry(pos, struct numlist, list);//得到当前数据节点的首地址，即指针
kfree(p);//释放该数据节点所占空间
printk("<0>""Node %d has removed from the doublelist...\n", i++);
}
printk("<0>""doublelist is exiting..\n");
}
module_init(doublelist_init);
module_exit(doublelist_exit);
[root@bogon I21c]# gedit Makefile
obj-m:=lb.o
PWD:=$(shell pwd)
CUR_PATH:=$(shell uname -r)
KERNEL_PATH:=/usr/src/kernels/$(CUR_PATH)
all:
make -C $(KERNEL_PATH) M=$(PWD) modules
clean:
make -C $(KERNEL_PATH) M=$(PWD) clean
[root@bogon I21c]# gedit Makefile
obj-m:=lb.o //目标文件
PWD:=$(shell pwd) //当前shell的路径赋值给PWD
CUR_PATH:=$(shell uname -r) //shell执行 uname -r命令为2.6.32-71.el6.i686
KERNEL_PATH:=/usr/src/kernels/$(CUR_PATH) //KERNEL_PATH:的完整路径为/usr/src/kernels/2.6.32-71.el6.i686
//此时Malefile调用2.6.32-71.el6.i686下的Makefile规则对目标文件进行编译。
all:
make -C $(KERNEL_PATH) M=$(PWD) modules
//make -C /usr/src/kernels/2.6.32-71.el6.i686 M=/root/桌面/I21c modules
clean:
make -C $(KERNEL_PATH) M=$(PWD) clean
[root@localhost I21c]# make
make -C /usr/src/kernels/2.6.32-71.el6.i686 M=/root/桌面/I21c modules
make[1]: Entering directory `/usr/src/kernels/2.6.32-71.el6.i686'
CC [M] /root/桌面/I21c/lb.o
Building modules, stage 2.
MODPOST 1 modules
CC /root/桌面/I21c/lb.mod.o
LD [M] /root/桌面/I21c/lb.ko.unsigned
NO SIGN [M] /root/桌面/I21c/lb.ko
make[1]: Leaving directory `/usr/src/kernels/2.6.32-71.el6.i686'
[root@localhost I21c]# insmod lb.ko
[root@localhost I21c]#
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:doublelist is starting...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 1 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 2 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 3 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 4 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 5 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 6 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 7 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 8 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 9 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 10 has added to the doublelist...
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:建立N个节点，依次加入到链表当中
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:遍历链表
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 1's data:1
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 2's data:2
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 3's data:3
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 4's data:4
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 5's data:5
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 6's data:6
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 7's data:7
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 8's data:8
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 9's data:9
Message from syslogd@localhost at Oct 8 16:59:13 ...
kernel:Node 10's data:10
[root@localhost I21c]# rmmod lb.ko
[root@localhost I21c]#
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:依次删除N个节点
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 1 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 2 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 3 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 4 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 5 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 6 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 7 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 8 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 9 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:Node 10 has removed from the doublelist...
Message from syslogd@localhost at Oct 8 16:59:29 ...
kernel:doublelist is exiting..
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