text: /****************************************************************************
   * apps/examples/nxterm/nxhello_listener.c
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <errno.h>
  
  #include <nuttx/nx/nx.h>
  
  #include "nxhello.h"
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: nxhello_listener
   ****************************************************************************/
  
  FAR void *nxhello_listener(FAR void *arg)
  {
    int ret;
  
    /* Process events forever */
  
    for (;;)
      {
        /* Handle the next event.  If we were configured blocking, then
         * we will stay right here until the next event is received.  Since
         * we have dedicated a while thread to servicing events, it would
         * be most natural to also select CONFIG_NX_BLOCKING -- if not, the
         * following would be a tight infinite loop (unless we added addition
         * logic with nx_eventnotify and sigwait to pace it).
         */
  
        ret = nx_eventhandler(g_nxhello.hnx);
        if (ret < 0)
          {
            /* An error occurred... assume that we have lost connection with
             * the server.
             */
  
            printf("nxhello_listener: Lost server connection: %d\n", errno);
            exit(EXIT_FAILURE);
          }
  
        /* If we received a message, we must be connected */
  
        if (!g_nxhello.connected)
          {
            g_nxhello.connected = true;
            sem_post(&g_nxhello.eventsem);
            printf("nxhello_listener: Connected\n");
          }
      }
  }
  