如何在python程序中关闭Ctrl-C上的套接字连接 [英] How to close socket connection on Ctrl-C in a python programme

问题描述

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(1)

any_connection = False

while True:
    try:
        conn, addr = s.accept()
        data = conn.recv(1024)
        any_connection = True

        # keep looking
        if not data: continue

        pid = os.fork()

        if pid == 0:
            server_process(data, conn)
    except KeyboardInterrupt:
        break

if any_connection:
    print("Closing connection")
    conn.close()

我在我用 Python 编写的无限运行的 TCP 服务器上捕获了 KeyboardInterrupt 信号.但是，即使我知道它正在关闭连接，因为它打印 Closing Connection，当我尝试重新运行服务器时，我得到:

I'm catching the KeyboardInterruptsignal here on an infinite-running TCP server I wrote in Python. However, even though I know it is closing the connection because it prints Closing Connection, when I try to re-run the server I get:

OSError: [Errno 48] 地址已被使用

我不知道发生了什么，因为我确信我正在调用 conn.close().

I have no idea what's happening because I know for sure I'm calling conn.close().

并且运行 killall python3 并没有修复它，除非我等待很长时间或更改端口，否则我一直收到错误消息.我也尝试 grep 所有 python3 进程，但我什么也没得到.

And running killall python3doesn't fix it, I keep getting the error unless I wait for a long time or change port. Also I tried to grep all python3 processes but I get nothing.

我正在运行 OS X Yosemite.

I'm running OS X Yosemite.

推荐答案

根据 docs错误 OSError: [Errno 48] Address already in use 发生的原因是之前执行的脚本使套接字处于 TIME_WAIT 状态，不能立即重用.这可以通过使用 socket.SO_REUSEADDR 标志来解决.

As per the docs the error OSError: [Errno 48] Address already in use occurs because the previous execution of your script has left the socket in a TIME_WAIT state, and can’t be immediately reused. This can be resolved by using the socket.SO_REUSEADDR flag.

例如:

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((HOST, PORT))

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