Closes the indicated socket, making SocketId invalid.
Normally, sockets are closed by closing both stream handles returned by
open_socket/3. There are two cases where tcp_close_socket/1
is used because there are no stream-handles:
If, after tcp_accept/3, the
server uses fork/1 to handle the
client in a sub-process. In this case the accepted socket is not longer
needed from the main server and must be discarded using tcp_close_socket/1.
If, after discovering the connecting client with
tcp_accept/3, the server does
not want to accept the connection, it should discard the accepted socket
immediately using tcp_close_socket/1.
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