linux - TCP/IP : set socket option for keep-alive after connection has been established

Question

是否可以在一些假设的应用程序级握手后设置套接字的 SO_KEEPALIVE 选项(TCP 保持事件间隔和 TCP 保持事件值)？还是必须在调用 accept 之前设置？

我关心 Linux、Windows 和 eCos lwIP 堆栈之间的互操作性，因此非常感谢有关这两个平台的信息。

Answer 1

正如EJP所说，你可以随时设置。 man page说:

setsockopt() manipulate options for the socket referred to by the file descriptor sockfd.

你可以像这样设置或取消设置SO_KEEPALIVE

int iOption = 1; // Turn on keep-alive, 0 = disables, 1 = enables
if (setsockopt(socketHandle, SOL_SOCKET, SO_KEEPALIVE, (const char *) &iOption,  sizeof(int)) == SOCKET_ERROR)
    {
           cerr << "Set keepalive: Keepalive option failed" << endl;
    }

您还可以阅读此 tutorial了解更多详情。