#include <stdio.h>
#include <stddef.h>

#define container_of(ptr, type, member) ({                      \
      const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
      (type *)( (char *)__mptr - offsetof(type,member) );})

struct babakaka {
      int     a;
      int     b;
      int     c;
      int     d;
      int     e;
};

void    main()
{
      struct  babakaka      aaa;
       int     *member[5];

       member[0] = &aaa.a;
       member[1] = &aaa.b;
       member[2] = &aaa.c;
       member[3] = &aaa.d;
       member[4] = &aaa.e;

       printf("-:%x\n", &aaa);
       printf("a:%x\n", container_of(member[0], struct  babakaka, a));
       printf("b:%x\n", container_of(member[1], struct  babakaka, b));
       printf("c:%x\n", container_of(member[2], struct  babakaka, c));
       printf("d:%x\n", container_of(member[3], struct  babakaka, d));
       printf("e:%x\n", container_of(member[4], struct  babakaka, e));
}

[root@localhost c]# ./a.out
-:bf9aeb78
a:bf9aeb78
b:bf9aeb78
c:bf9aeb78
d:bf9aeb78
e:bf9aeb78