关闭C中的侦听TCP套接字 [英] Closing a listening TCP socket in C

问题描述

假设您有一个侦听TCP端口的套接字，并且某些客户端已连接.当在C中发出sock_close(fd)并尝试在同一端口上再次绑定时，绑定失败.在"netstat -plutnoa"上看到一些TIME_WAIT状态，例如:

Suppose you have a socket listening on a TCP port, and some clients are connected. When one issues sock_close(fd) in C and tries to bind again on the same port, binding fails. Some TIME_WAIT state is seen on the "netstat -plutnoa" such as:

tcp        0      0 127.0.0.1:4567          127.0.0.1:32977         TIME_WAIT   -                timewait (17.12/0/0)

那么如何正确断开服务器套接字并立即在同一端口上重新连接?

So how one can properly disconnect the server socket and reconnect on the same port immediately?

推荐答案

您要在套接字上使用SO_REUSEADDR选项.相关的联机帮助页是 socket(7) .这是其用法的示例. 此问题说明了会发生什么.

You want to use the SO_REUSEADDR option on the socket. The relevant manpage is socket(7). Here's an example of its usage. This question explains what happens.

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