OSI/AS and OSI/TS Supplement (Includes RFC-1006 Support)

Programming a Server
Programming With the Sockets Interface
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both). Calling SHUTDOWN is optional; if it is not done, the call to CLOSE
performs the implicit SHUTDOWN function.
8. Close one socket or both of the sockets.
To release the connection, call SHUTDOWN_NW and the CLOSE procedure on
the second socket. The first socket created in step 2 should not be shut down or
closed until the transport process is aborted.