[英]Linux Kernel Linked List and 'typeof' error
我正在尝试在Linux内核中实现链接列表。
我认为我的头文件很好,但是当我尝试编译主文件以测试我所做的事情时,我并不真正了解出什么问题了...
我的文件list.h:
#ifndef _LIST_H
#define _LIST_H
struct list_head {
struct list_head *next, *prev;
};
static inline void
INIT_LIST_HEAD (struct list_head *head)
{
head->next = head->prev = head;
}
static inline void
list_add (struct list_head *node,struct list_head *head)
{
head->next->prev = node;
node->next = head->next;
node->prev = head;
head->next = node;
}
static inline void
list_del (struct list_head *node)
{
node->next->prev = node->prev;
node->prev->next = node->next;
}
#define container_of(ptr, type, member) ({\
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type, member) );})
#define list_for_each_entry(cur, head, member) \
for (cur = container_of((head)->next, typeof(*cur),member);&cur->member != (head); \
cur = container_of(cur->member.next,typeof(*cur), member))
#endif /* _LIST_H */
我的主文件:
#include <stdlib.h>
#include <stdio.h>
#include "list.h"
struct kool_list{
int to;
struct list_head list;
int from;
};
int
main(){
struct kool_list *tmp;
struct list_head *pos, *q;
unsigned int i;
struct kool_list mylist;
INIT_LIST_HEAD(&mylist.list);
/* adding elements to mylist */
for(i=5; i!=0; --i){
tmp= (struct kool_list *)malloc(sizeof(struct kool_list));
printf("enter to and from:");
scanf("%d %d", &tmp->to, &tmp->from);
list_add(&(tmp->list), &(mylist.list));
}
printf("\n");
printf("traversing the list using list_for_each_entry()\n");
list_for_each_entry(tmp, &mylist.list, list)
printf("to= %d from= %d\n", tmp->to, tmp->from);
printf("\n");
return 0;
}
当我用gcc * .c -o main编译它时,出现以下错误:
In file included from main.c:3:0:
main.c: In function ‘main’:
list.h:35:41: error: expected expression before ‘typeof’
for (cur = container_of((head)->next, typeof(*cur),member);&cur->member != (head); \
^
list.h:32:37: note: in definition of macro ‘container_of’
(type *)( (char *)__mptr - offsetof(type, member) );})
^
main.c:77:2: note: in expansion of macro ‘list_for_each_entry’
list_for_each_entry(tmp, &mylist.list, list)
^
list.h:36:39: error: expected expression before ‘typeof’
cur = container_of(cur->member.next,typeof(*cur), member))
^
list.h:32:37: note: in definition of macro ‘container_of’
(type *)( (char *)__mptr - offsetof(type, member) );})
^
main.c:77:2: note: in expansion of macro ‘list_for_each_entry’
list_for_each_entry(tmp, &mylist.list, list)
^
似乎我没有以正确的方式操纵'typeof',但我不明白为什么...如果有人可以解释什么地方出了问题,谢谢:)
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