Method set_socket_options

implementation/endpoints/src/local_socket_tcp_impl.cpp:194–250

}

void local_socket_tcp_impl::set_socket_options(configuration const& _configuration) {
    boost::system::error_code ec;
    // force always TCP RST on close/shutdown, in order to:
    // 1) avoid issues with TIME_WAIT, which otherwise lasts for 120 secs with a
    // non-responding endpoint (see also 4396812d2)
    // 2) handle by default what needs to happen at suspend/shutdown
    socket_->set_option(boost::asio::socket_base::linger(true, 0), ec);
    if (ec) {
        VSOMEIP_WARNING_P << "Could not setsockopt(SO_LINGER), " << ec.message() << ", " << name_;
    }
    socket_->set_option(boost::asio::socket_base::reuse_address(true), ec);
    if (ec) {
        VSOMEIP_WARNING_P << "Could not setsockopt(SO_REUSEADDR), " << ec.message() << ", " << name_;
    }
    // Nagle algorithm off
    socket_->set_option(boost::asio::ip::tcp::no_delay(true), ec);
    if (ec) {
        VSOMEIP_WARNING_P << "Could not setsockopt(SO_TCP_NODELAY), " << ec.message() << ", " << name_;
    }

    // connection in the same host (and not across a host and guest or similar)
    // important, as we can (MUST!) be lax in the socket options - no keep alive necessary
    if (own_endpoint_.address() == peer_endpoint_.address()) {
        // disable keep alive
        socket_->set_option(boost::asio::socket_base::keep_alive(false), ec);
        if (ec) {
            VSOMEIP_WARNING_P << "Could not setsockopt(SO_KEEPALIVE) to false, " << ec.message() << ", " << name_;
        }
    } else {
        // enable keep alive
        socket_->set_option(boost::asio::socket_base::keep_alive(true), ec);
        if (ec) {
            VSOMEIP_WARNING_P << "Could not setsockopt(SO_KEEPALIVE) to true, " << ec.message() << ", " << name_;
        }

#if defined(__linux__) || defined(ANDROID)
        // set a user timeout
        // along the keep alives, this ensures connection closes if endpoint is unreachable
        if (!socket_->set_user_timeout(_configuration.get_local_tcp_user_timeout())) {
            VSOMEIP_WARNING_P << "Could not setsockopt(TCP_USER_TIMEOUT), errno " << errno << ", " << name_;
        }

        // override kernel settings
        // unfortunate, but there are plenty of custom keep-alive settings, and need to
        // enforce some sanity here
        if (!socket_->set_keepidle(_configuration.get_local_tcp_keepidle())) {
            VSOMEIP_WARNING_P << "Could not setsockopt(TCP_KEEPIDLE), errno " << errno << ", " << name_;
        }
        if (!socket_->set_keepintvl(_configuration.get_local_tcp_keepintvl())) {
            VSOMEIP_WARNING_P << "Could not setsockopt(TCP_KEEPINTVL), errno " << errno << ", " << name_;
        }
        if (!socket_->set_keepcnt(_configuration.get_local_tcp_keepcnt())) {
            VSOMEIP_WARNING_P << "Could not setsockopt(TCP_KEEPCNT), errno " << errno << ", " << name_;
        }
#endif
    }
}
} // namespace vsomeip_v3