我正在尝试使用套接字建立服务器/客户端连接。但他们不能正常关闭,我无法理解为什么。
我已经纠正了我的愚蠢错误,而不是实际上在问题中调用s.close函数。 但结果证明这不是我的问题。
这是我的服务器代码:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket
import sys
if __name__ == '__main__':
# Server connection
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345 # Reserve a port for your service.
print 'Server started!'
print 'Waiting for clients...'
s.bind((host, port)) # Bind to the port
s.listen(5) # Now wait for client connection.
c, addr = s.accept() # Establish connection with client.
print 'Got connection from', addr
msg = c.recv(1024)
print addr, ' >> ', msg
if msg == 'close':
print 'Closing down'
c.send('SENT: Closing down')
c.shutdown(socket.SHUT_RDWR)
c.close()
这是我的客户代码:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket
if __name__ == '__main__':
# Server
s = socket.socket() # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345 # Reserve a port for your service.
print 'Connecting to ', host, port
s.connect((host, port))
msg = raw_input('CLIENT >> ')
s.send(msg)
msg = s.recv(1024)
print 'SERVER >> ', msg
s.close() # Close the socket when done
这是它产生的错误信息:
In [13]: %run cjboxd.py
Server started!
Waiting for clients...
---------------------------------------------------------------------------
error Traceback (most recent call last)
/usr/lib/python2.7/dist-packages/IPython/utils/py3compat.pyc in execfile(fname, *where)
173 else:
174 filename = fname
--> 175 __builtin__.execfile(filename, *where)
/home/nine/slask/cjboxd.py in <module>()
19 print 'Waiting for clients...'
20
---> 21 s.bind((host, port)) # Bind to the port
22 s.listen(5) # Now wait for client connection.
23 c, addr = s.accept() # Establish connection with client.
/usr/lib/python2.7/socket.pyc in meth(name, self, *args)
222
223 def meth(name,self,*args):
--> 224 return getattr(self._sock,name)(*args)
225
226 for _m in _socketmethods:
error: [Errno 98] Address already in use
它将在一分钟后发挥作用。
答案 0 :(得分:9)
您需要socket.socket.setsockopt
,。i.e s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
虽然在进程结束时os将关闭套接字,但是显式调用close()是一个很好的行为。
但是,在此之后,本地地址(local_ip,local_port)在2 MSL(maximum segment lifetime)
过去之前是不可用的。为什么?我们能做什么?你可以阅读这些:
http://www.tcpipguide.com/free/t_TCPConnectionTermination-3.htm 和http://www.unixguide.net/network/socketfaq/4.5.shtml
我很难发布比他们更明确的帖子:)。
答案 1 :(得分:3)
您正在呼叫s.close
,而不是s.close()
。
如果希望客户端终止连接,则需要调用socket.close()方法。