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px4-firmware/nuttx/graphics/nxmu/nx_eventhandler.c

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/****************************************************************************
* graphics/nxmu/nx_eventhandler.c
*
* Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <stdint.h>
#include <stdlib.h>
#include <mqueue.h>
#include <assert.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
****************************************************************************/
/****************************************************************************
* Name: nx_connected
*
* Description:
* The server has completed the connection and is ready.
*
****************************************************************************/
static inline void nx_connected(FAR struct nxfe_conn_s *conn)
{
DEBUGASSERT(conn->state == NX_CLISTATE_NOTCONNECTED);
conn->state = NX_CLISTATE_CONNECTED;
}
/****************************************************************************
* Name: nx_disconnected
****************************************************************************/
static inline void nx_disconnected(FAR struct nxfe_conn_s *conn)
{
/* Close the server and client MQs */
(void)mq_close(conn->cwrmq);
(void)mq_close(conn->crdmq);
/* And free the client structure */
free(conn);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nx_eventhandler
*
* Description:
* The client code must call this function periodically to process
* incoming messages from the server. If CONFIG_NX_BLOCKING is defined,
* then this function not return until a server message is received.
*
* When CONFIG_NX_BLOCKING is not defined, the client must exercise
* caution in the looping to assure that it does not eat up all of
* the CPU bandwidth calling nx_eventhandler repeatedly. nx_eventnotify
* may be called to get a signal event whenever a new incoming server
* event is avaiable.
*
* Input Parameters:
* handle - the handle returned by nx_connect
*
* Return:
* OK: No errors occurred. If CONFIG_NX_BLOCKING is defined, then
* one or more server message was processed.
* ERROR: An error occurred and errno has been set appropriately. Of
* particular interest, it will return errno == EHOSTDOWN when the
* server is disconnected. After that event, the handle can no
* longer be used.
*
****************************************************************************/
int nx_eventhandler(NXHANDLE handle)
{
FAR struct nxfe_conn_s *conn = (FAR struct nxfe_conn_s *)handle;
struct nxsvrmsg_s *msg;
struct nxbe_window_s *wnd;
uint8_t buffer[NX_MXCLIMSGLEN];
int nbytes;
/* Get the next message from our incoming message queue */
do
{
nbytes = mq_receive(conn->crdmq, buffer, NX_MXCLIMSGLEN, 0);
if (nbytes < 0)
{
/* EINTR is not an error. The wait was interrupted by a signal and
* we just need to try reading again.
*/
if (errno != EINTR)
{
if (errno == EAGAIN)
{
/* EAGAIN is not an error. It occurs because the MQ is opened with
* O_NONBLOCK and there is no message available now.
*/
return OK;
}
else
{
gdbg("mq_receive failed: %d\n", errno);
return ERROR;
}
}
}
}
while (nbytes < 0);
DEBUGASSERT(nbytes >= sizeof(struct nxclimsg_s));
/* Dispatch the message appropriately */
msg = (struct nxsvrmsg_s *)buffer;
gvdbg("Received msgid=%d\n", msg->msgid);
switch (msg->msgid)
{
case NX_CLIMSG_CONNECTED:
nx_connected(conn);
break;
case NX_CLIMSG_DISCONNECTED:
nx_disconnected(conn);
errno = EHOSTDOWN;
return ERROR;
case NX_CLIMSG_REDRAW:
{
FAR struct nxclimsg_redraw_s *redraw = (FAR struct nxclimsg_redraw_s *)buffer;
wnd = redraw->wnd;
DEBUGASSERT(wnd);
if (wnd->cb->redraw)
{
wnd->cb->redraw((NXWINDOW)wnd, &redraw->rect, redraw->more, wnd->arg);
}
}
break;
case NX_CLIMSG_NEWPOSITION:
{
FAR struct nxclimsg_newposition_s *postn = (FAR struct nxclimsg_newposition_s *)buffer;
wnd = postn->wnd;
DEBUGASSERT(wnd);
if (wnd->cb->position)
{
wnd->cb->position((NXWINDOW)wnd, &postn->size, &postn->pos, &postn->bounds, wnd->arg);
}
}
break;
#ifdef CONFIG_NX_MOUSE
case NX_CLIMSG_MOUSEIN:
{
FAR struct nxclimsg_mousein_s *mouse = (FAR struct nxclimsg_mousein_s *)buffer;
wnd = mouse->wnd;
DEBUGASSERT(wnd);
if (wnd->cb->mousein)
{
wnd->cb->mousein((NXWINDOW)wnd, &mouse->pos, mouse->buttons, wnd->arg);
}
}
break;
#endif
#ifdef CONFIG_NX_KBD
case NX_CLIMSG_KBDIN:
{
FAR struct nxclimsg_kbdin_s *kbd = (FAR struct nxclimsg_kbdin_s *)buffer;
wnd = kbd->wnd;
DEBUGASSERT(wnd);
if (wnd->cb->kbdin)
{
wnd->cb->kbdin((NXWINDOW)wnd, kbd->nch, kbd->ch, wnd->arg);
}
}
break;
#endif
default:
gdbg("Unrecognized message opcode: %d\n", ((FAR struct nxsvrmsg_s *)buffer)->msgid);
break;
}
return OK;
}
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