6.5.3 WSAOVERLAPPED的细节

WSAOVERLAPPED结构提供了一个重叠I/O操作的初始化和它将来的如何被完成之间的通讯媒体。WSAOVERLAPPED结构被设计成与Win32中的OVERLAPPED结构兼容：

       typedef struct WSAOVERLAPPED {

              DWORD      Internal;        // reserved

              DWORD      InternalHigh;    // reserved

              DWORD      Offset;          // ignored

              DWORD      OffsetHigh;      // ignored

              WSAEVENT   hEve