有的時候需要傳遞大量的數據，如果將數據通過dbus傳遞，會消耗大量的帶寬。可以通過傳遞一個文件描述符替代傳遞數據：
以下的service通過文件描述符接收數據：
//fd_service.cpp
#include <sdbusplus/asio/connection.hpp>
#include <sdbusplus/asio/object_server.hpp>
#include <sdbusplus/bus.hpp>
#include <iostream>
#include <string>
#include <unistd.h>
using namespace std;void transferFd(string str, sdbusplus::message::unix_fd fdGet)
{cout<<"recv str:"<<str<<endl;cout<<"recv fdGet:"<<fdGet.fd<<endl;char buf[100] = {0};read(fdGet.fd, buf, sizeof(buf) - 1);cout<<"read data:"<<buf<<endl;sleep(10);
}int main()
{boost::asio::io_context io;auto conn = std::make_shared<sdbusplus::asio::connection>(io);conn->request_name("org.example.TestService");auto server = sdbusplus::asio::object_server(conn);share
