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During implement simple forking TCP server, I got the hang-up child
process binding listen socket which caused parent(listen/accept)
restarting failed. (port in use)
Because child process does something with connected socket, there's no
need to bind listen socket in child process.
(finish_request() calls RequestHandlerClass with connected socket(=request))
Simply add self.socket.close() in the beginning of forked child process.
SocketServer.ForkingMixIn :
 def process_request(self, request, client_address):
 """Fork a new subprocess to process the request."""
 self.collect_children()
 pid = os.fork()
 if pid:
 # Parent process
 if self.active_children is None:
 self.active_children = []
 self.active_children.append(pid)
 self.close_request(request)
 return
 else:
 # Child process.
 # This must never return, hence os._exit()!
 self.socket.close() # close parent's listen socket in child
 try:
 self.finish_request(request, client_address)
 os._exit(0)
 except:
 try:
 self.handle_error(request, client_address)
 finally:
 os._exit(1)