container_of宏定义解析

标签：linux kernel   c语言   指针   

container_of宏，定义kernel.h中：

/**
* container_of - cast a member of a structure out to the containing structure
* @ptr:     the pointer to the member.
* @type:     the type of the container struct this is embedded in.
* @member:     the name of the member within the struct.
*
*/
#define container_of(ptr, type, member) ({             /
         const typeof( ((type *)0)->member ) *__mptr = (ptr);     /
         (type *)( (char *)__mptr - offsetof(type,member) );})

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

container_of宏定义解析

标签：linux kernel   c语言   指针   

原文地址：http://blog.csdn.net/lezardfu/article/details/44916167