[Ecls-list] Closing BSD-SOCKET when a stream has been created

[Juan Jose Garcia Ripoll]

Let me restate the problem:

1. SOCKET-CLOSE does not behave properly because it either close the 
streams or the file descriptor, but not both.
2. When closing a TWO-WAY-STREAM, the components are not closed. It 
happens that socket streams are of this type, and thus closing the 
stream does not lead to immediate closing of the file descriptor 
associtated to the socket.

The fact that socket streams are two-way-streams is no problem. I have 
recoded SOCKET-CLOSE so that it closes _both_ the composite stream and 
the file descriptor. The stream-elements from the two-way stream need 
not be closed explicitely, since their associated file descriptor has 
been closed anyway.

Now the behavior during garbage collection is as follows. If the socket 
structure is garbage collected, the streams that form part of it will be 
eventually unreferenced and garbage collected as well. This will lead to 
the file descriptor being closed.

Juanjo