examples/nxterm/nxterm_listener.c

/****************************************************************************
 * examples/nxterm/nxterm_listener.c
 *
 *   Copyright (C) 2012, 2015-2016 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <errno.h>

#include <nuttx/nx/nx.h>

#include "nxterm_internal.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: nxterm_listener
 ****************************************************************************/

FAR void *nxterm_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_nxterm_vars.hnx);
      if (ret < 0)
        {
          /* An error occurred... assume that we have lost connection with
           * the server.
           */

          printf("nxterm_listener: Lost server connection: %d\n", errno);
          exit(EXIT_FAILURE);
        }

      /* If we received a message, we must be connected */

      if (!g_nxterm_vars.connected)
        {
          g_nxterm_vars.connected = true;
          sem_post(&g_nxterm_vars.eventsem);
          printf("nxterm_listener: Connected\n");
        }
    }
}