入门者的WinSock编程问题

以下是《Windows网络编程》一书中TCP/IP服务器程序的一段代码： #include void main(void) { WSADATA wsaData; SOCKET ListeningSocket,NewConnection; SOCKADDR_IN ServerAddr,ClientAddr; int Port=5150; WSAStartup(MAKEWORD(2,2),&wsaData); ListeningSocket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP); ServerAddr.sin_family=AF_INET; ServerAddr.sin_port=htons(Port); ServerAddr.sin_addr.s_addr=htonl(INADDR_ANY); bind(ListeningSocket,(SOCKADDR*)&ServerAddr,sizeof(ServerAddr)); listen(ListeningSocket,5); int ClientAddrLen; NewConnection=accept(ListeningSocket,(SOCKADDR*)&ClientAddr,&ClientAddrLen); closesocket(NewConnection); closesocket(ListeningSocket); WSACleanup(); } 按说在没经设置前套接口是阻塞的，所以如果没有客户机连接，该段代码在执行到accept()时应该会阻塞，但我在执行该代码时却并没有阻塞。请问这是怎么回事呢？