The misbehavior shown below has potentially severe security implications:

 $ gst -i
 "Global garbage collection... done"
 GNU Smalltalk ready
 
 st> PackageLoader fileInPackage: 'Sport'
 Loading package Sockets
 Loading package Sport
 PackageLoader
 st> s := SpSocket newTCPSocket
 a SpSocket
 st> s examine
 An instance of SpSocket
   underlyingSocket: nil
   class: Sockets.StreamSocket
   socketAddress: nil
 a SpSocket
 st> a := SpIPAddress hostName: '127.0.0.1' port: 4080
 a SpIPAddress
 st> a examine
 An instance of SpIPAddress
   hostAddress: ByteArray (127 0 0 1 )
   portNumber: 4080
 a SpIPAddress
 st> s bindSocketAddress: a
 a SpSocket
 st> s examine
 An instance of SpSocket
   underlyingSocket: nil
   class: Sockets.StreamSocket
   socketAddress: a SpIPAddress
 a SpSocket
 st> s listenBackloggingUpTo: 1
 a SpSocket
 st> s examine
 An instance of SpSocket
   underlyingSocket: Sockets.ServerSocket[0.0.0.0:4080]
   class: Sockets.StreamSocket
   socketAddress: a SpIPAddress
 a SpSocket

$ uname -a
Linux g128 2.6.27-gentoo-r7-0709 #2 SMP Thu Jul 9 07:42:50 CEST 2009 x86_64 Intel(R) Core(TM)2 Duo CPU E8500 @ 3.16GHz GenuineIntel GNU/Linux

smalltalk from git head: commit d9418db1e3827cdf4f63b220421f775d13f29e0e