/**************************************************************************** * libs/libnx/nxmu/nx_eventhandler.c * * Copyright (C) 2008-2009, 2011-2013, 2017, 2019 Gregory Nutt. All * rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include "nxcontext.h" /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: nx_connected * * Description: * The server has completed the connection and is ready. * ****************************************************************************/ static inline void nx_connected(FAR struct nxmu_conn_s *conn) { DEBUGASSERT(conn->state == NX_CLISTATE_NOTCONNECTED); conn->state = NX_CLISTATE_CONNECTED; } /**************************************************************************** * Name: nx_disconnected ****************************************************************************/ static inline void nx_disconnected(FAR struct nxmu_conn_s *conn) { /* Close the server and client MQs */ _MQ_CLOSE(conn->cwrmq); _MQ_CLOSE(conn->crdmq); /* And free the client structure */ lib_ufree(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 available. * * Input Parameters: * handle - the handle returned by nx_connect * * Returned Value: * 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 nxmu_conn_s *conn = (FAR struct nxmu_conn_s *)handle; struct nxsvrmsg_s *msg; struct nxbe_window_s *wnd; char 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) { int errcode = _MQ_GETERRNO(nbytes); /* EINTR is not an error. The wait was interrupted by a signal and * we just need to try reading again. */ if (errcode != EINTR) { if (errcode == 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 { gerr("ERROR: _MQ_RECEIVE failed: %d\n", errcode); _MQ_SETERRNO(nbytes); return ERROR; } } } } while (nbytes < 0); DEBUGASSERT(nbytes >= sizeof(struct nxclimsg_s)); /* Dispatch the message appropriately */ msg = (struct nxsvrmsg_s *)buffer; ginfo("Received msgid=%" PRId32 "\n", msg->msgid); switch (msg->msgid) { case NX_CLIMSG_CONNECTED: nx_connected(conn); break; case NX_CLIMSG_DISCONNECTED: nx_disconnected(conn); set_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_XYINPUT 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 case NX_CLIMSG_EVENT: { FAR struct nxclimsg_event_s *event = (FAR struct nxclimsg_event_s *)buffer; wnd = event->wnd; DEBUGASSERT(wnd); if (wnd->cb->event) { wnd->cb->event((NXWINDOW)wnd, event->event, wnd->arg, event->arg); } } break; default: gerr("ERROR: Unrecognized message opcode: %" PRId32 "\n", ((FAR struct nxsvrmsg_s *)buffer)->msgid); break; } return OK; }