incubator-nuttx/graphics/nxmu/nx_disconnect.c

/****************************************************************************
 * graphics/nxmu/nx_disconnect.c
 *
 *   Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <mqueue.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/nx/nx.h>
#include "nxfe.h"

/****************************************************************************
 * Pre-Processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nx_disconnect
 *
 * Description:
 *   Disconnect a client from the NX server and/or free resources reserved
 *   by nx_connect/nx_connectinstance.
 *
 * Input Parameters:
 *   handle - the handle returned by nx_connect
 *
 * Return:
 *   OK on success; ERROR on failure with the errno set appropriately.
 *   NOTE that handle will no long be valid upon return.
 *
 ****************************************************************************/

void nx_disconnect(NXHANDLE handle)
{
  FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
  struct nxsvrmsg_s       outmsg;
  int                     ret;

  /* Inform the server that this client no longer exists */

  outmsg.msgid = NX_SVRMSG_DISCONNECT;
  outmsg.conn  = conn;

  /* We will finish the teardown upon receipt of the DISCONNECTED message */

  ret = nxmu_sendserver(conn, &outmsg, sizeof(struct nxsvrmsg_s));
  if (ret < 0)
    {
      gdbg("ERROR: nxmu_sendserver() returned %d\n", ret);
    }
}