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1.定义

container_of(ptr, type, member);ARGUMENTS       ptr           the pointer to the member.//代表指针       type           the type of the container struct this is embedded in.//类型       member　//成员变量           the name of the member within the struct.

作用:通过一个结构体变量中的成员地址找到这个结构体变量的首地址

２.例子

#include 
   
    #undef offsetof#ifdef __compiler_offsetof#define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)#else#define offsetof(TYPE, MEMBER)  ((size_t)&((TYPE *)0)->MEMBER)#endif#define container_of(ptr, type, member) ({                  \                            const typeof( ((type*)0)->member ) *__mptr = (ptr); \                            (type*)( (char*)__mptr - offsetof(type,member) ); })typedef struct {    int age;    int num;} student;int main(){    student s;    printf("ss:%p\n", &s);    student *temp = container_of(&s.num, student, num);    printf("temp:%p\n", temp);    return 0;}结果:ss:0x7fff156fe320temp:0x7fff156fe320通过s.num的地址找到了结构体变量的地址
   

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