123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102 |
- /****************************************************************************
- * net/netdev/netdev_default.c
- *
- * Copyright (C) 2014-2015, 2018 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 <nuttx/net/netdev.h>
- #include "utils/utils.h"
- #include "netdev/netdev.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: netdev_default
- *
- * Description:
- * Return the default network device. REVISIT: At present this function
- * arbitrarily returns the first UP device at the head of the device
- * list. Perhaps the default device should be a device name
- * configuration option?
- *
- * So why is this here: It represents my current though for what to do
- * if a socket is connected with INADDY_ANY. In this case, I suppose we
- * should use the IP address associated with some default device???
- *
- * Input Parameters:
- * NULL
- *
- * Returned Value:
- * Pointer to default network driver on success; null on failure
- *
- ****************************************************************************/
- FAR struct net_driver_s *netdev_default(void)
- {
- FAR struct net_driver_s *ret = NULL;
- FAR struct net_driver_s *dev;
- /* Examine each registered network device */
- net_lock();
- for (dev = g_netdevices; dev; dev = dev->flink)
- {
- /* Is the interface in the "up" state? */
- if ((dev->d_flags & IFF_UP) != 0)
- {
- /* Return a reference to the first device that we find in the UP
- * state (but not the loopback device unless it is the only
- * device).
- */
- ret = dev;
- if (dev->d_lltype != NET_LL_LOOPBACK)
- {
- break;
- }
- }
- }
- net_unlock();
- return ret;
- }
|