Function disconnect

src/remote/inet.cpp:1737–1825

#endif // !defined(WIN_NT)

static void disconnect(rem_port* port)
{
/**************************************
 *
 *	d i s c o n n e c t
 *
 **************************************
 *
 * Functional description
 *	Break a remote connection.
 *
 **************************************/

	// SO_LINGER was turned off on the initial bind when the server was started.
	// This will force a reset to be sent to the client when the socket is closed.
	// We only want this behavior in the case of the server terminating
	// abnormally and not on an orderly shut down.  Because of this, turn the
	// SO_LINGER option back on for the socket.  The result of setsockopt isn't
	// too important at this stage since we are closing the socket anyway.  This
	// is an attempt to return the socket to a state where a graceful shutdown can
	// occur.

	if (port->port_linger.l_onoff)
	{
		setsockopt(port->port_handle, SOL_SOCKET, SO_LINGER,
				   (SCHAR*) &port->port_linger, sizeof(port->port_linger));
	}

	if (port->port_handle != INVALID_SOCKET)
	{
		shutdown(port->port_handle, 2);
	}

	MutexLockGuard guard(port_mutex, FB_FUNCTION);
	if (port->port_state == rem_port::DISCONNECTED)
		return;

	port->port_state = rem_port::DISCONNECTED;
	port->port_flags &= ~PORT_connecting;

	if (port->port_async)
	{
		disconnect(port->port_async);
		port->port_async = NULL;
	}
	port->port_context = NULL;

	// hvlad: delay closing of the server sockets to prevent its reuse
	// by another (newly accepted) port until next select() call. See
	// also select_wait() function.
	const bool delayClose = (port->port_server_flags && port->port_parent);

	// If this is a sub-port, unlink it from its parent
	port->unlinkParent();

	inet_ports->unRegisterPort(port);

	if (delayClose)