检测TCP客户端断开连接 [英] Detecting TCP Client Disconnect

问题描述

假设我正在运行一个简单的服务器，并且从客户端连接 accept（）。

Let's say I'm running a simple server and have accept()ed a connection from a client.

当客户端断开连接时，最好的方式是什么？通常，客户端应该发送关闭命令，但如果手动断开连接或完全失去网络连接怎么办？服务器如何检测或处理这个？

What is the best way to tell when the client has disconnected? Normally, a client is supposed to send a close command, but what if it disconnects manually or loses network connection altogether? How can the server detect or handle this?

推荐答案

select当您使用ioctl *来检查等待被读取的字节数时，它将为零。这是一个标志，套接字已断开。

select (with the read mask set) will return with the handle signalled, but when you use ioctl* to check the number of bytes pending to be read, it will be zero. This is a sign that the socket has been disconnected.

这是一个伟大的讨论，检查客户端已断开连接的各种方法： Stephen Cleary，检测半连接（已删除）连接。

This is a great discussion on the various methods of checking that the client has disconnected: Stephen Cleary, Detection of Half-Open (Dropped) Connections.

*对于Windows使用ioctlsocket。

* for Windows use ioctlsocket.

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