得闲研究下面几个宏！！
#define offsetof(type,memb) (ssize_t)&(((type *)0)->memb);
#define msleep(i) usleep((i)*1000)
#define die(s) do {perror(s); exit(1);} while(0)
#define fail(s) do {perror(s); return -1;} while(0)
#define offsetof(type, memb) (ssize_t)&(((type *)0)->memb)
#define array_size(arr) ((int)(sizeof(arr) / sizeof((arr)[0])))
