263 lines
8.1 KiB
C
263 lines
8.1 KiB
C
/****************************************************************************
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* libs/libnx/nxmu/nx_eventhandler.c
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*
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* Copyright (C) 2008-2009, 2011-2013, 2017, 2019 Gregory Nutt. All
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* 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 <stdint.h>
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#include <stdlib.h>
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#include <mqueue.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/mqueue.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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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_connected
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*
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* Description:
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* The server has completed the connection and is ready.
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*
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****************************************************************************/
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static inline void nx_connected(FAR struct nxmu_conn_s *conn)
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{
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DEBUGASSERT(conn->state == NX_CLISTATE_NOTCONNECTED);
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conn->state = NX_CLISTATE_CONNECTED;
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}
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/****************************************************************************
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* Name: nx_disconnected
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****************************************************************************/
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static inline void nx_disconnected(FAR struct nxmu_conn_s *conn)
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{
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/* Close the server and client MQs */
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mq_close(conn->cwrmq);
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mq_close(conn->crdmq);
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/* And free the client structure */
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lib_ufree(conn);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nx_eventhandler
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*
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* Description:
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* The client code must call this function periodically to process
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* incoming messages from the server. If CONFIG_NX_BLOCKING is defined,
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* then this function not return until a server message is received.
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*
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* When CONFIG_NX_BLOCKING is not defined, the client must exercise
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* caution in the looping to assure that it does not eat up all of
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* the CPU bandwidth calling nx_eventhandler repeatedly. nx_eventnotify
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* may be called to get a signal event whenever a new incoming server
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* event is available.
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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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*
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* Returned Value:
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* OK: No errors occurred. If CONFIG_NX_BLOCKING is defined, then
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* one or more server message was processed.
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* ERROR: An error occurred and errno has been set appropriately. Of
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* particular interest, it will return errno == EHOSTDOWN when the
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* server is disconnected. After that event, the handle can no
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* longer be used.
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*
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****************************************************************************/
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int nx_eventhandler(NXHANDLE handle)
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{
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FAR struct nxmu_conn_s *conn = (FAR struct nxmu_conn_s *)handle;
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struct nxsvrmsg_s *msg;
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struct nxbe_window_s *wnd;
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char buffer[NX_MXCLIMSGLEN];
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int nbytes;
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/* Get the next message from our incoming message queue */
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do
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{
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nbytes = _MQ_RECEIVE(conn->crdmq, buffer, NX_MXCLIMSGLEN, 0);
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if (nbytes < 0)
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{
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int errcode = _MQ_GETERRNO(nbytes);
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/* EINTR is not an error. The wait was interrupted by a signal and
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* we just need to try reading again.
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*/
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if (errcode != EINTR)
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{
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if (errcode == EAGAIN)
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{
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/* EAGAIN is not an error. It occurs because the MQ is
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* opened with O_NONBLOCK and there is no message
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* available now.
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*/
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return OK;
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}
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else
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{
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gerr("ERROR: _MQ_RECEIVE failed: %d\n", errcode);
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_MQ_SETERRNO(nbytes);
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return ERROR;
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}
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}
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}
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}
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while (nbytes < 0);
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DEBUGASSERT(nbytes >= sizeof(struct nxclimsg_s));
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/* Dispatch the message appropriately */
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msg = (struct nxsvrmsg_s *)buffer;
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ginfo("Received msgid=%" PRId32 "\n", msg->msgid);
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switch (msg->msgid)
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{
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case NX_CLIMSG_CONNECTED:
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nx_connected(conn);
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break;
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case NX_CLIMSG_DISCONNECTED:
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nx_disconnected(conn);
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set_errno(EHOSTDOWN);
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return ERROR;
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case NX_CLIMSG_REDRAW:
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{
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FAR struct nxclimsg_redraw_s *redraw =
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(FAR struct nxclimsg_redraw_s *)buffer;
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wnd = redraw->wnd;
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DEBUGASSERT(wnd);
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if (wnd->cb->redraw)
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{
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wnd->cb->redraw((NXWINDOW)wnd, &redraw->rect, redraw->more,
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wnd->arg);
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}
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}
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break;
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case NX_CLIMSG_NEWPOSITION:
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{
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FAR struct nxclimsg_newposition_s *postn =
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(FAR struct nxclimsg_newposition_s *)buffer;
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wnd = postn->wnd;
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DEBUGASSERT(wnd);
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if (wnd->cb->position)
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{
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wnd->cb->position((NXWINDOW)wnd, &postn->size, &postn->pos,
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&postn->bounds, wnd->arg);
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}
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}
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break;
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#ifdef CONFIG_NX_XYINPUT
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case NX_CLIMSG_MOUSEIN:
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{
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FAR struct nxclimsg_mousein_s *mouse =
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(FAR struct nxclimsg_mousein_s *)buffer;
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wnd = mouse->wnd;
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DEBUGASSERT(wnd);
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if (wnd->cb->mousein)
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{
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wnd->cb->mousein((NXWINDOW)wnd, &mouse->pos, mouse->buttons,
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wnd->arg);
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}
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}
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break;
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#endif
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#ifdef CONFIG_NX_KBD
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case NX_CLIMSG_KBDIN:
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{
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FAR struct nxclimsg_kbdin_s *kbd =
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(FAR struct nxclimsg_kbdin_s *)buffer;
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wnd = kbd->wnd;
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DEBUGASSERT(wnd);
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if (wnd->cb->kbdin)
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{
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wnd->cb->kbdin((NXWINDOW)wnd, kbd->nch, kbd->ch, wnd->arg);
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}
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}
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break;
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#endif
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case NX_CLIMSG_EVENT:
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{
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FAR struct nxclimsg_event_s *event =
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(FAR struct nxclimsg_event_s *)buffer;
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wnd = event->wnd;
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DEBUGASSERT(wnd);
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if (wnd->cb->event)
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{
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wnd->cb->event((NXWINDOW)wnd, event->event, wnd->arg,
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event->arg);
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}
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}
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break;
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default:
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gerr("ERROR: Unrecognized message opcode: %" PRId32 "\n",
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((FAR struct nxsvrmsg_s *)buffer)->msgid);
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break;
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}
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return OK;
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}
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