Cleanup of doc files.

Fixed xterm.py (and cleanup) to clean up screen sessions.
Cleaned up sshd.py (though interface is still in flux.)
Added 1024-node network example (treenet1024.py).
Added example showing multiple tests on a single network (multitest.py).
Renamed examples to make them easier to type!

examples/sshd.py

@@ -1,11 +1,15 @@
 #!/usr/bin/python
 
-"""Create a network and start sshd(8) on the hosts.
-   While something like rshd(8) would be lighter and faster,
-   (and perfectly adequate on an in-machine network)
-   the advantage of running sshd is that scripts can work
-   unchanged on mininet and hardware."""
+"""
+Create a network and start sshd(8) on the hosts.
 
+While something like rshd(8) would be lighter and faster,
+(and perfectly adequate on an in-machine network)
+the advantage of running sshd is that scripts can work
+unchanged on mininet and hardware.
+"""
+
+import sys ; readline = sys.stdin.readline
 from mininet import init, Node, createLink, TreeNet, Cli
 
 def nets( hosts ):
@@ -17,42 +21,35 @@ def nets( hosts ):
       nets[ net ] = True
    return nets.keys()
    
-def addRoutes( node, nets, intf ):
-   "Add routes from node to nets through intf."
-   for net in nets:
-      node.cmdPrint( 'route add -net ' + net + ' dev ' + intf )
-
-def removeRoutes( node, nets ):
-   "Remove routes to nets from node."
-   for net in nets:
-      node.cmdPrint( 'route del -net ' + net )
-   
-def sshd( network ):
-   "Start sshd up on each host, routing appropriately."
-   controllers, switches, hosts = (
-      network.controllers, network.switches, network.hosts )
-   # Create a node in root ns and link to switch 0
+def connectToRootNS( network, switch ):
+   "Connect hosts to root namespace via switch. Starts network."
+   # Create a node in root namespace and link to switch 0
    root = Node( 'root', inNamespace=False )
-   createLink( root, switches[ 0 ] )
+   createLink( root, switch )
    ip = '10.0.123.1'
    root.setIP( root.intfs[ 0 ], ip, '/24' )
+   # Start network that now includes link to root namespace
    network.start()
    # Add routes
-   routes = nets( hosts )
-   addRoutes( root, routes, root.intfs[ 0 ] )
-   # Start up sshd on each host
-   for host in hosts: host.cmdPrint( '/usr/sbin/sshd' )
-   # Dump out IP addresses and run CLI
-   print
-   print "*** Hosts are running sshd at the following addresses:"
-   for host in hosts: print host.name, host.IP()
-   print
-   print "*** Starting Mininet CLI - type 'exit' or ^D to exit"
-   network.runTest( Cli )
-   network.stop()
-   removeRoutes( root, routes )
-   
+   routes = nets( network.hosts )
+   intf = root.intfs[ 0 ]
+   for net in routes:
+      root.cmdPrint( 'route add -net ' + net + ' dev ' + intf )
+
+def startServers( network, server ):
+   "Start network, and servers on each host."
+   connectToRootNS( network, network.switches[ 0 ] )
+   for host in network.hosts: host.cmdPrint( server )
+
 if __name__ == '__main__':
    init()
-   network = TreeNet( depth=1, fanout=2, kernel=True )
-   sshd( network )
+   network = TreeNet( depth=1, fanout=4, kernel=True )
+   startServers( network, '/usr/sbin/sshd' )
+   print
+   print "*** Hosts are running sshd at the following addresses:"
+   print
+   for host in network.hosts: print host.name, host.IP()
+   print
+   print "*** Press return to shut down network: ",
+   readline()
+   network.stop()