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POTrying to implement non-blocking python udp multiple ports getting wierd exception
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  1. POTrying to implement non-blocking python udp multiple ports getting wierd exception
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    copied!<p>I'm trying to implement a non-blocking python udp server which listens on multiple ports.</p> <p>I found some code in this <a href="https://stackoverflow.com/questions/5308080/python-socket-accept-nonblocking">Stackover posting</a> and modified it to listen on multiple sockets, so far, so good.</p> <p>My code is as follows.</p> <pre><code>#!/usr/bin/python import select import socket ports_list=[7777,7778] def make_socket(number): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('', number)) sock.listen(5) return sock read_list= map(lambda x: make_socket(x), ports_list) print(read_list) print "Listening on port %s" % ports_list while True: readable, writable, errored = select.select(read_list, [], []) for s in readable: if s in read_list: client_socket, address = s.accept() read_list.append(client_socket) print "Connection from", address else: data = s.recv(1024) if data: s.send(data) else: s.close() read_list.remove(s) </code></pre> <p>I test it by running netcat in another console </p> <pre><code>$ netcat localhost 7778 dsa </code></pre> <p>But it borks, like so:</p> <pre><code>/udp_non_blocking_listener.py [&lt;socket._socketobject object at 0xb72804fc&gt;, &lt;socket._socketobject object at 0xb7280534&gt;] Listening on port [7777, 7778] Connection from ('127.0.0.1', 41237) Traceback (most recent call last): File "./udp_non_blocking_listener.py", line 27, in &lt;module&gt; client_socket, address = s.accept() File "/usr/lib/python2.7/socket.py", line 202, in accept sock, addr = self._sock.accept() socket.error: [Errno 22] Invalid argument </code></pre> <p>I'm just getting started on python non-blocking API, what is the idiomatic way to do something like this?</p>
 

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