113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/****************************************************************************
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* libnx/nxmu/nx_openwindow.c
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*
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* Copyright (C) 2008-2009, 2011-2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/nx/nx.h>
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#include <nuttx/nx/nxbe.h>
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#include <nuttx/nx/nxmu.h>
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#include "nxcontext.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_openwindow
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*
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* Description:
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* Create a new window.
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*
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* Input Parameters:
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* handle - The handle returned by nx_connect
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* cb - Callbacks used to process window events
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* arg - User provided value that will be returned with NX callbacks.
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*
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* Returned Value:
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* Success: A non-NULL handle used with subsequent NX accesses
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* Failure: NULL is returned and errno is set appropriately
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*
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****************************************************************************/
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NXWINDOW nx_openwindow(NXHANDLE handle, FAR const struct nx_callback_s *cb,
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FAR void *arg)
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{
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FAR struct nxbe_window_s *wnd;
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int ret;
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#ifdef CONFIG_DEBUG_FEATURES
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if (!handle || !cb)
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{
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set_errno(EINVAL);
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return NULL;
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}
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#endif
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/* Pre-allocate the window structure */
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wnd = (FAR struct nxbe_window_s *)lib_uzalloc(sizeof(struct nxbe_window_s));
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if (!wnd)
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{
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set_errno(ENOMEM);
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return NULL;
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}
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/* Then let nx_constructwindow do the rest */
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ret = nx_constructwindow(handle, (NXWINDOW)wnd, cb, arg);
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if (ret < 0)
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{
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/* An error occurred, the window has been freed */
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return NULL;
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}
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/* Return the uninitialized window reference. Since the server
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* serializes all operations, we can be assured that the window will
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* be initialized before the first operation on the window.
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*/
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return (NXWINDOW)wnd;
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}
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