121 lines
4.5 KiB
C
121 lines
4.5 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_constsructwindow.c
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*
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* Copyright (C) 2008, 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 <stdlib.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_constructwindow
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*
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* Description:
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* This function is the same a nx_openwindow EXCEPT that the client provides
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* the window structure instance. nx_constructwindow will initialize the
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* the pre-allocated window structure for use by NX. This function is
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* provided in addition to nx_openwindow in order to support a kind of
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* inheritance: The caller's window structure may include extensions that
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* are not visible to NX.
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*
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* NOTE: hwnd must have been allocated using a user-space allocator that
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* permits user access to the window. Once provided to nx_constructwindow()
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* that memory is owned and managed by NX. On certain error conditions or
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* when the window is closed, NX will free the 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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* hwnd - The pre-allocated window structure.
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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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* OK on success; ERROR on failure with errno set appropriately. In the
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* case of ERROR, NX will have deallocated the pre-allocated window.
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*
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****************************************************************************/
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int nx_constructwindow(NXHANDLE handle, NXWINDOW hwnd,
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FAR const struct nx_callback_s *cb, FAR void *arg)
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{
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FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
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FAR struct nxbe_window_s *wnd = (FAR struct nxbe_window_s *)hwnd;
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struct nxsvrmsg_openwindow_s outmsg;
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#ifdef CONFIG_DEBUG_FEATURES
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if (!wnd)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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if (!conn || !cb)
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{
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lib_ufree(wnd);
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set_errno(EINVAL);
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return ERROR;
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}
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#endif
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/* Setup only the connection structure, callbacks and client private data
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* reference. The server will set everything else up.
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*/
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wnd->conn = conn;
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wnd->cb = cb;
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wnd->arg = arg;
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/* Request initialization the new window from the server */
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outmsg.msgid = NX_SVRMSG_OPENWINDOW;
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outmsg.wnd = wnd;
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return nxmu_sendserver(conn, &outmsg, sizeof(struct nxsvrmsg_openwindow_s));
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}
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