linux链表之：使用for循环添加链表、list_add、list_add_tail

使用for循环，向链表中添加10个节点

如果使用list_add，则将节点添加到链表头，那么使用后面的list_for_each打印时，便是倒着的：

*********************************************

index:9, name:name9

index:8, name:name8

index:7, name:name7

index:6, name:name6

index:5, name:name5

index:4, name:name4

index:3, name:name3

index:2, name:name2

index:1, name:name1

index:0, name:name0

*********************************************

如果使用list_add_tail，则将节点添加到链表尾，那么使用后面的list_for_each打印时，便是顺序打印的：

*********************************************

index:0, name:name0

index:1, name:name1

index:2, name:name2

index:3, name:name3

index:4, name:name4

index:5, name:name5

index:6, name:name6

index:7, name:name7

index:8, name:name8

index:9, name:name9

*********************************************

源码如下：

[email protected]:/mnt/shared/kernelbox/list# cat listuse.c
#include "list.h"

struct stListUse
{
        char name[32];
        int  index;
        struct list_head list;
};

LIST_HEAD(list_use_head);

struct stListUse *pstListNode;

int main(int argc, char *argv[])
{
        int i;
        char nametmp[32];
        struct stListUse *pstListTmp;
        struct list_head *tmp;

        printf("enter listuse.c/main()\n");

        for(i=0; i<10; i++)
        {
                pstListNode = (struct stListUse *)malloc(sizeof(struct stListUse));
                memset(pstListNode, 0, sizeof(struct stListUse));

                /* init node i */
                pstListNode->index = i;
                sprintf(nametmp, "name%d", i);
                strcpy(pstListNode->name, nametmp);

                /* add node i to list list_use_head */
                #if 0
                list_add(&pstListNode->list, &list_use_head);
                #endif

                list_add_tail(&pstListNode->list, &list_use_head);
        }

        pstListTmp =(struct stListUse *)malloc(sizeof(struct stListUse));

        /* print list */
        printf("*********************************************\n");
        list_for_each(tmp, &list_use_head)
        {
                pstListTmp = list_entry(tmp, struct stListUse, list);
                printf("index:%d, name:%s\n", pstListTmp->index, pstListTmp->name);
        }
        printf("*********************************************\n");

        return 0;
}