incubator-nuttx/net/netdev/netdev_count.c

/****************************************************************************
 * net/netdev/netdev_count.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 <string.h>
#include <errno.h>

#include <nuttx/net/netdev.h>

#include "utils/utils.h"
#include "netdev/netdev.h"

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

/****************************************************************************
 * Name: netdev_count
 *
 * Description:
 *   Return the number of network devices
 *
 * Input Parameters:
 *   None
 *
 * Returned Value:
 *   The number of network devices
 *
 ****************************************************************************/

int netdev_count(void)
{
  struct net_driver_s *dev;
  int ndev;

  net_lock();
  for (dev = g_netdevices, ndev = 0; dev; dev = dev->flink, ndev++);
  net_unlock();
  return ndev;
}