CODEWITHSUNDEEP
pythonsocketsnetwork-programming
jim ying
jim ying

Reputation: 391

How to make a socket server that only accepts one connection?

I write a TCP server using Python. I want the server only accept on client connection.

I use the listen function

listen(1)

but the server still can accepts more than one connection.

Upvotes: 1

Views: 4270

Answers (2)

debug
debug

Reputation: 1079

If you want only one connection, pleae don't use loop for socket.accept() in- connections.

demo code:

#!/usr/bin/python

import time
import socket


server = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_addr = ('127.0.0.1', 8080)
server.bind(server_addr)
server.listen(1)
print("listening on {}".format(server_addr))
client, client_addr = server.accept()

for i in range(10):
    client.send("num: {}\n".format(i))
    time.sleep(1)

raw_input('')

Upvotes: 1

user5547025
user5547025

Reputation:

From the documentation:

If backlog is specified, it must be at least 0 (if it is lower, it is set to 0); it specifies the number of unaccepted connections that the system will allow before refusing new connections.

So if you use listen(1) you allow one unaccepted connection. If you want to allow no unaccepted connections, you must use listen(0).

Upvotes: 1

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