CODEWITHSUNDEEP
pythonsockets
Dmitrii Mikhailov
Dmitrii Mikhailov

Reputation: 5231

Two-way communication using AF_UNIX socket

I'd like to implement the example from python official documentation on socket module using AF_UNIX socket instead of AF_INET. So here's how server code looks now:

import socket
import os

filename = '/tmp/mysock'
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
if os.path.exists(filename):
    os.remove(filename)
sock.bind(filename)
while 1:
    data = sock.recv(1024)
    print 'Received', repr(data)
    if not data:
        break
    sock.sendall(data)
sock.close()

When I run it, I get this:

Traceback (most recent call last):
  File "/home/somecode/server.py", line 10, in <module>
    data = sock.recv(2048)
socket.error: [Errno 22] Invalid argument

Upvotes: 1

Views: 2233

Answers (1)

Daniel Sawka
Daniel Sawka

Reputation: 1380

SOCK_STREAM is a stateful socket type, so any connection must first be acknowledged by a listening socket and then new dynamic socket (connection) is used for sending and receiving instead. You can't just receive from listening socket.

Basically you forgot to call sock.listen() on socket after binding and connection, address = sock.accept(), which blocks until a connection is established and then returns tuple with new socket (connection) and client address. Then simply use connection.recv(). This is universal for UNIX sockets and TCP/IP sockets.

For example have a look here.

Upvotes: 4

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