iostream and No_delay option

问题

I am trying to disable the Nagle Algorithm using the answer for the same question: ASIO ip::tcp::iostream and TCP_NODELAY:

    boost::asio::ip::tcp::iostream socketStream;
    const boost::asio::ip::tcp::no_delay option( true );
    socketStream.rdbuf()->set_option( option );
    boost::asio::io_service io_service;
    tcp::endpoint endpoint (tcp::v4 (), 6666);
    tcp::acceptor acceptor (io_service, endpoint);

    std::cout << "Waiting for connection.." << std::endl;
    acceptor.accept (*socketStream.rdbuf ());
    std::cout << "Connected!" << std::endl;

and when running the code this error appears:

set_option: Bad file descriptor

How can I solve this problem?

回答1:

Where you set the option, the stream is still invalid (not open).

Wait until the socket is open, before setting the option:

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#include <boost/asio.hpp>
#include <iostream>

static boost::asio::ip::tcp::no_delay const no_delay_option (true);

int main() {
    using boost::asio::ip::tcp;

    tcp::iostream socketStream;


    boost::asio::io_service io_service;

    tcp::endpoint endpoint (tcp::v4(), 6666);
    tcp::acceptor acceptor (io_service, endpoint);

    std::cout << "Waiting for connection.." << std::endl;
    acceptor.accept (*socketStream.rdbuf ());
    socketStream.rdbuf()->set_option(no_delay_option);

    std::cout << "Connected!" << std::endl;
    std::cout << socketStream.rdbuf() << "\n";
}

(We send main.cpp to port 6666 using netcat there)

来源：https://stackoverflow.com/questions/30685502/iostream-and-no-delay-option