BSD socket 非阻塞模式连接


BSD socket 非阻塞模式连接,适用用各种实现BSD socket的操作系统:windows,  linux, unix, ios, android.

int CNetTcpC::StartConnect(LPCSTR pszIPAddr, UINT nPort)
{
        SOCKADDR_IN ctrl_sin;
        UINT sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
        ctrl_sin.sin_family = AF_INET;
        ctrl_sin.sin_addr.s_addr = inet_addr(m_szSvrIP);
        ctrl_sin.sin_port = htons(m_uiSvrPort);
        bzero(&(ctrl_sin.sin_zero), 8);
    
       int flag = fcntl(sock, F_GETFL, 0);
       fcntl(sock, F_SETFL, flag | O_NONBLOCK);

       struct timeval tmout;
       tmout.tv_sec = 10;
       tmout.tv_usec = 0;
       setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tmout, sizeof(tmout));

       int err = connect(sock, (SOCKADDR*)&ctrl_sin, sizeof(ctrl_sin));
       printf("Connect error no is %d:\r",err);
    
       //设置select超时时间间隔   
       fd_set          fdwrite;    
       struct timeval  tvSelect;    
    
       FD_ZERO(&fdwrite);    
      FD_SET(sock, &fdwrite);
      tvSelect.tv_sec = 10;
      tvSelect.tv_usec = 0;    
      int retval = select(sock + 1,NULL, &fdwrite, NULL, &tvSelect);
    
      printf("select error no is %d:\r",retval);
      if ( retval <= 0 )
      {
         close(sock);
         sock = INVALID_SOCKET;
         return FALSE;
      }
    
      //在connect成功之后,设成阻塞模式
      flag = fcntl(sock, F_GETFL,0);
      flag &= ~ O_NONBLOCK;
      fcntl(sock, F_SETFL, flag);

      return TRUE;
}




你可能感兴趣的:(BSD socket 非阻塞模式连接)