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【C语言】linux内核循环链表练习之创、插,查、删、清、显 示例

  • 2026-02-08 00:07:54
【C语言】linux内核循环链表练习之创、插,查、删、清、显 示例

@

  • linux内核链表个人理解
  • 内核链表解决得问题(为啥要用内核链表)
  • 前期说明
  • 链表定义
  • 初始化
  • 创建链表节点
  • 插入
  • 查找
  • 删除
  • 清空
  • 显示

前言

本文以一个例题的实现来讲解【C语言】linux内核循环链表练习之创、插,查、删、清、显 示例。

linux内核链表简介

linux内核链表个人理解

所谓linux内核链表(后面简称linux指针域),即使用linux内核中已经写好得独立出来得链表(双向循环链表),它是一个linux内核中统一得标准得链表。之后我们操作时只需要在linux指针域得上面封装数据域即可。

内核链表的标准节点及其所有操作,都被封装在内核源码中,具体来讲都被封装在一个名为 list.h 的文件中,该文件在内核中的位置是:

kernel/linux/include/list.h

内核中的源码文件 list.h 实际上包含了两部分内容,一是内核链表,二是哈希链表。经过整理的、仅包含内核链表的文件:kernel_list.h

内核链表解决得问题(为啥要用内核链表)

内核链表主要是为了解决普通链表得通用性问题。 如下图所示,普通链表数据域和指针域混在一起,导致通用性不好,所以内核指针将指针域独立出来,那么就可以任意套数据域方便通用操作。

大概分两步:内核中list已经做了

  • 设计标准节点
  • 针对标准节点,设计由标准节点构成的标准链表的所有操作

题目

完成如下功能,用内核链表来实现,从键盘输入一个整数

  • (1)如果这个整数大于0,插入到链表,要求:有相同的元素就不添加
  • (2)如果是负整数,就将这个负整数的绝对值从链表删除,如果不存在,打印提示
  • (3)如果输入的是0,就遍历显示链表的所有元素,程序退出

代码实现

前期说明

该示例就是调用linux内核中得指针域标准代码,封装后得使用。整理过后得部分代码展示如下:

//指针域部分,小结构体,用它来构建“纯粹链表”
structlist_head {
structlist_head *next, *prev;
};

//节点结构体指针初始化
#define INIT_LIST_HEAD(ptr) do { \
(ptr)->next = (ptr); (ptr)->prev = (ptr); \
} while (0)


/*
* Insert a new entry between two known consecutive entries.
*
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/


//将new节点插入到prev和next节点之间
staticinlinevoid __list_add(struct list_head *new,
struct list_head *prev,
struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}

/**
* list_add_tail – add a new entry
* @new: new entry to be added
* @head: list head to add it before
*
* Insert a new entry before the specified head.
* This is useful for implementing queues.
*/

//将new节点插入到head的前面
staticinlinevoidlist_add_tail(struct list_head *new, struct list_head *head)
{
__list_add(new, head->prev, head);
}

链表定义

typedefint Datatype; 

typedefstructKernel_list{
structlist_headlist;
    Datatype data;
}k_list;

关键点:

  • struct list_head在linux指针域已经实现了,只需要调用即可;
  • 这里定义得指针域用得是变量而不是指针,是为了后面使用时可以直接使用,而不用先申请空间(指针要使用都得先申请地址!!!)
  • 这里将指针域放到数据域上面是为了方便理解,指针域指向得地址就是整个链表节点得地址,只需要做一下数据类型转换即可,内核中也有处理得方法,甚至于调用得时候只需要注意是大得链表还是指针域链表即可。

初始化

k_list* init_Kernel_list(void){
    k_list *head = (k_list*)malloc(sizeof(k_list));
if (head!=NULL){
        INIT_LIST_HEAD(&(head->list));
    }

return head;
}

关键点:

  • INIT_LIST_HEAD是linux指针域得中封装好得函数,只需要看怎么调用即可。

创建链表节点

k_list *create_Kernel_list_node(Datatype data){
    k_list *node = (k_list*)malloc(sizeof(k_list));
if (node!=NULL){
        node->data = data;
        INIT_LIST_HEAD(&(node->list));
    }

return node;
}

关键点:

  • INIT_LIST_HEAD是linux指针域得中封装好得函数,只需要看怎么调用即可;
  • 这个创建节点比初始化就只多了个数据域赋值;

插入

voidinsert_Kernel_list_node(k_list *head, k_list *node){
    list_add(&(node->list), &(head->list));
}

voidinsert_Kernel_list_node_tail(k_list *head, k_list *node){
    list_add_tail(&(node->list), &(head->list));
}

关键点:

  • list_add是linux指针域得中封装好得函数(头插),只需要看怎么调用即可;
  • list_add_tail是linux指针域得中封装好得函数(尾插),只需要看怎么调用即可;

查找

k_list *find_Kernel_list_node(k_list *head, Datatype data){
    k_list *pos,*n;

    list_for_each_entry_safe(pos, n, &(head->list), list){
if(pos->data == data){
return pos;
        }
    }  

returnNULL;
}

关键点:

  • list_for_each_entry_safe是linux指针域得中封装好得函数(循环),只需要看怎么调用即可;
  • 带“_safe”标记得是有安全保证得函数,比如在删除得时候,不会出现删除一个后就段错误

删除

booldelete_Kernel_list_node(k_list *head, Datatype data){
    k_list *pos,*n;
bool flag = false;
    list_for_each_entry_safe(pos, n, &(head->list), list){
        k_list *dele = find_Kernel_list_node(head, data);
if(dele!=NULL){

            list_del(&(dele->list));
free(dele);
            flag = true;
        }
    }  
if(flag==false){
printf("delete error\n");
    }
else{
printf("delete success\n");
    }
return flag;

}

关键点:

  • list_for_each_entry_safe是linux指针域得中封装好得函数(循环),只需要看怎么调用即可;
  • 带“_safe”标记得是有安全保证得函数,比如在删除得时候,不会出现删除一个后就段错误
  • list_del是linux指针域得中封装好得函数(删除),只需要看怎么调用即可;

清空

voidclear_Kernel_list(k_list *head){
    k_list *pos,*n;
    list_for_each_entry_safe(pos, n, &(head->list), list){
        list_del(&(pos->list));
free(pos);
    }  
}

关键点:

  • 清空只需要在删除得基础上增加释放空间即可free(pos);

显示

voidshow_Kernel_list(k_list *head){
printf("list data:\n");
    k_list *pos;
    k_list *n;

    list_for_each_entry_safe(pos, n, &(head->list), list){
// if(pos->list.next != &(head->list)){
printf("%d ", pos->data);
// }
    }  
printf("\n");

}

关键点:

  • list_for_each_entry_safe是linux指针域得中封装好得函数(循环),只需要看怎么调用即可;

主函数

intmain(int argc, char *argv[]){
    k_list *head = init_Kernel_list();
if(head==NULL){
printf("init error\n");
return-1;
    }

for (int i=0; i<10; i++){
        k_list *node = create_Kernel_list_node(i);
if(node!=NULL){
            insert_Kernel_list_node_tail(head, node);
        }
    }

    show_Kernel_list(head);
printf("输入一个数,+加,-删,0退出:\n");
while(1){
int num;
scanf("%d", &num);
if(num==0){
            show_Kernel_list(head);
break;
        }
elseif(num>0){
            k_list *node = create_Kernel_list_node(num);
if(node!=NULL){
                insert_Kernel_list_node_tail(head, node);
            }
        }
elseif(num<0){
            delete_Kernel_list_node(head, -num);
        }
    }

    clear_Kernel_list(head);
return0;
}

代码测试结果

yin@ubuntu:/mnt/hgfs/share/c_code/KeTang/02_数据结构$ ./04
list data:
0 1 2 3 4 5 6 7 8 9
输入一个数,+加,-删,0退出:
15
36
19
65
25
-5
delete success
-4
delete success
0
list data:
0 1 2 3 6 7 8 9 15 36 19 65 25

显示结果与预期相同。

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  1. CONNECT:[ UseTime:0.001316s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001977s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000757s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.010445s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001638s ]
  6. SELECT * FROM `set` [ RunTime:0.009585s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001727s ]
  8. SELECT * FROM `article` WHERE `id` = 466875 LIMIT 1 [ RunTime:0.006668s ]
  9. UPDATE `article` SET `lasttime` = 1770510658 WHERE `id` = 466875 [ RunTime:0.014979s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000680s ]
  11. SELECT * FROM `article` WHERE `id` < 466875 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001085s ]
  12. SELECT * FROM `article` WHERE `id` > 466875 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001474s ]
  13. SELECT * FROM `article` WHERE `id` < 466875 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001766s ]
  14. SELECT * FROM `article` WHERE `id` < 466875 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002299s ]
  15. SELECT * FROM `article` WHERE `id` < 466875 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013067s ]
0.235926s