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C语言 ({}) 表达式返回最后一个表达式的值，如x=({a;b;c;d;})，最终x的值应该是d。来源于 container_of #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE*)0)->MEMBER) #define container_of(ptr, type, member) ({ \ const typeof( ((type *)0)->member ) *__mptr = (const typeof( ((type *)0)->member ) *)(ptr); \ (type *)( (char *)__mptr - offsetof(type,member) );})