Boost asio 同步连接超时设置失败

场景

        boost库中的asio模块，在阻塞模式下，调用connect进行服务器的连接，如果服务器没有打开，默认情况下需要20秒的超时连接，才会返回。目前尝试设置套接字的连接超时时间，都不奏效。估计只能修改boost源码中的超时时间

//设置成非阻塞，然后调用select等待超时，无效

int TestBoostAsioConnectTimeout()

{

 boost::asio::io_service ios;

 boost::asio::ip::tcp::socket sock(ios);

 boost::system::error_code ec;

 sock.open(boost::asio::ip::tcp::v4());

 // 设为非阻塞  

 sock.io_control(boost::asio::ip::tcp::socket::non_blocking_io(true));

 sock.connect(

  boost::asio::ip::tcp::endpoint(

   boost::asio::ip::address::from_string("192.168.1.1"), 80)

  , ec);

 fd_set fdWrite;

 FD_ZERO(&fdWrite);

 FD_SET(sock.native(), &fdWrite);

 timeval tv = { 5 };    // 5秒超时  

 if (select(0, NULL, &fdWrite, NULL, &tv) <= 0

  || !FD_ISSET(sock.native(), &fdWrite))

 {

  std::cout << "连接超时" << std::endl;

  sock.close();

  return 0;

 }

 // 设回阻塞  

 sock.io_control(boost::asio::ip::tcp::socket::non_blocking_io(false));

 std::cout << "连接成功" << std::endl;

 sock.close();

 return 0;

}

//获取原始的套接字，进行属性的设置

int TestBoostAsioConnectOverTime()

{

 boost::asio::io_service ios;

 boost::asio::ip::tcp::socket sock(ios);

 boost::system::error_code ec;

 sock.open(boost::asio::ip::tcp::v4());

 // 设为非阻塞  

 sock.io_control(boost::asio::ip::tcp::socket::non_blocking_io(true));

 int timeout = 3000; 

 int nRet = setsockopt(sock.native(), SOL_SOCKET, SO_CONNECT_TIME, (const char*)&timeout, sizeof(timeout));

 nRet = setsockopt(sock.native(), SOL_SOCKET, SO_RCVTIMEO, (const char*)&timeout, sizeof(timeout));

 sock.connect(

  boost::asio::ip::tcp::endpoint(

   boost::asio::ip::address::from_string("192.168.1.1"), 80)

  , ec);

 fd_set fdWrite;

 FD_ZERO(&fdWrite);

 FD_SET(sock.native(), &fdWrite);

 timeval tv;

 tv.tv_sec = 1;   // 5秒超时 

 tv.tv_usec = 0;

 if (select(0, NULL, &fdWrite, NULL, &tv) <= 0

  || !FD_ISSET(sock.native(), &fdWrite))

 {

  std::cout << "超时/出错啦" << std::endl;

  sock.close();

  return 0;

 }

 // 设回阻塞  

 sock.io_control(boost::asio::ip::tcp::socket::non_blocking_io(false));

 std::cout << "连接成功" << std::endl;

 sock.close();

 return 0;

}

设置超时的代码：

windows:

 int nTvlen=1000;  //1s

 int retOpt=setsockopt(m_Socket,SOL_SOCKET, SO_RCVTIMEO, (const char*)&nTvlen,sizeof(nTvlen));

linux:

 struct timeval nTvlen={1,0}; //1S

 int retOpt=setsockopt(m_Socket,SOL_SOCKET, SO_RCVTIMEO, (const char*)&nTvlen,sizeof(nTvlen));

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