Add simple Unix socket example by Piet van Oostrum.

Demo/sockets/README

@@ -5,10 +5,12 @@ echosvr.py		About the simplest TCP server possible.
 finger.py		Client for the 'finger' protocol.
 ftp.py			A very simple ftp client.
 gopher.py		A simple gopher client.
+radio.py		Receive time broadcasts from broadcast.py.
 telnet.py		Client for the 'telnet' protocol.
 throughput.py		Client and server to measure TCP throughput.
+unixclient.py		Unix socket example, client side
+unixserver.py		Unix socket example, server side
 udpecho.py		Client and server for the UDP echo protocol.
-radio.py		Receive time broadcasts from broadcast.py.
 
 The following file is only relevant on SGI machines (or other systems
 that support multicast):

Demo/sockets/unixclient.py

@@ -0,0 +1,10 @@
+# Echo client demo using Unix sockets
+# Piet van Oostrum
+from socket import *
+FILE = 'blabla'
+s = socket(AF_UNIX, SOCK_STREAM)
+s.connect(FILE)
+s.send('Hello, world')
+data = s.recv(1024)
+s.close()
+print 'Received', `data`

Demo/sockets/unixserver.py

@@ -0,0 +1,14 @@
+# Echo server program using Unix sockets (handles one connection only)
+from socket import *
+FILE = 'blabla'             
+s = socket(AF_UNIX, SOCK_STREAM)
+s.bind(FILE)
+print 'Sock name is: ['+s.getsockname()+']'
+s.listen(1)
+conn, addr = s.accept()
+print 'Connected by', addr
+while 1:
+    data = conn.recv(1024)
+    if not data: break
+    conn.send(data)
+conn.close()