将套接字设置为非阻塞状态

 

创建一个套接字并将之设置为非阻塞模式：

SOCKET s;
unsigned long ul = 1;
int  ret;
s = socket(AF_INET, SOCK_STREAM, 0);
ret = ioctlsocket(s, FIONRIO, (unsigned long)&ul);
if(SOCKET_ERROR==ret)
{
  //未能将套接字设置为非阻塞模式
}