如何关闭被杀死的程序打开的套接字? [英] How to close a socket left open by a killed program?

问题描述

我有一个 Python 应用程序，它打开一个简单的 TCP 套接字以与单独主机上的另一个 Python 应用程序进行通信.有时程序会出错，或者我会直接杀死它，在任何一种情况下，套接字可能会在未知的时间内保持打开状态.

下次运行程序时出现此错误:

socket.error: [Errno 98] 地址已被使用

现在程序总是尝试使用同一个端口，所以它看起来好像仍然是打开的.我检查并确定该程序没有在后台运行，但我的地址仍在使用中.

那么，我如何手动(或以其他方式)关闭套接字/地址，以便我的程序可以立即重新使用它?

更新

根据 Mike 的回答，我查看了 socket(7) 页面并查看了 SO_REUSEADDR:

<块引用>

SO_REUSEADDR指示用于验证 bind(2) 调用中提供的地址的规则应该允许重用本地地址.对于 AF_INET 套接字，这意味着套接字可以绑定，除非有一个绑定到该地址的活动侦听套接字.当聆听——ing 套接字绑定到具有特定端口的 INADDR_ANY 那么就不可能绑定到此端口以获取任何本地地址.参数是一个整数布尔标志.

解决方案

假设你的 socket 名为 s... 你需要在服务器端设置 socket.SO_REUSEADDR绑定到接口之前的套接字...这将允许您立即重新启动 TCP 服务器...

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)s.bind((ADDR, PORT))

I have a Python application which opens a simple TCP socket to communicate with another Python application on a separate host. Sometimes the program will either error or I will directly kill it, and in either case the socket may be left open for some unknown time.

The next time I go to run the program I get this error:

socket.error: [Errno 98] Address already in use

Now the program always tries to use the same port, so it appears as though it is still open. I checked and am quite sure the program isn't running in the background and yet my address is still in use.

SO, how can I manually (or otherwise) close a socket/address so that my program can immediately re-use it?

Update

Based on Mike's answer I checked out the socket(7) page and looked at SO_REUSEADDR:

SO_REUSEADDR
    Indicates that the rules used in validating addresses supplied in a bind(2) call should
    allow reuse of local addresses.  For AF_INET sockets this means that a socket may bind,
    except when there is an active listening socket bound to the address.  When the listen‐
    ing  socket is bound to INADDR_ANY with a specific port then it is not possible to bind
    to this port for any local address.  Argument is an integer boolean flag.

解决方案

Assume your socket is named s... you need to set socket.SO_REUSEADDR on the server's socket before binding to an interface... this will allow you to immediately restart a TCP server...

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((ADDR, PORT))

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