canutils/canlib/canlib_getloopback.c

/****************************************************************************
 * canutils/canlib/canlib_getloopback.c
 *
 *   Copyright (C) 2016 Sebastien Lorquet. All rights reserved.
 *   Author: Sebastien Lorquet <sebastien@lorquet.fr>
 *
 * 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 <sys/ioctl.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <fcntl.h>
#include <errno.h>
#include <nuttx/can/can.h>

/****************************************************************************
 * Name: canlib_getloopback
 *
 * Description:
 *   Wrapper for CANIOC_GET_CONNMODES.
 *
 * Input Parameter:
 *   fd       - file descriptor of an opened can device
 *   loopback - pointer to a buffer to store the current loopback mode state.
 *
 * Returned Value:
 *   Zero (OK) is returned on success.  Otherwise -1 (ERROR)
 *   is returned with the errno variable set to indicate the
 *   nature of the error.
 *
 ****************************************************************************/

int canlib_getloopback(int fd, FAR bool *loopback)
{
  int ret;
  struct canioc_connmodes_s connmodes;

  ret = ioctl(fd, CANIOC_GET_CONNMODES, (unsigned long)&connmodes);
  if (ret != OK)
    {
      canerr("CANIOC_GET_CONNMODES failed, errno=%d\n", errno);
      return FALSE;
    }

  *loopback = (bool)connmodes.bm_loopback;

  return ret;
}