68951e8d72
* Remove multiple newlines at the end of files * Remove the whitespace from the end of lines
102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/****************************************************************************
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* net/netdev/netdev_default.c
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*
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* Copyright (C) 2014-2015, 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/net/netdev.h>
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#include "utils/utils.h"
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#include "netdev/netdev.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netdev_default
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*
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* Description:
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* Return the default network device. REVISIT: At present this function
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* arbitrarily returns the first UP device at the head of the device
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* list. Perhaps the default device should be a device name
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* configuration option?
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*
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* So why is this here: It represents my current though for what to do
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* if a socket is connected with INADDY_ANY. In this case, I suppose we
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* should use the IP address associated with some default device???
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*
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* Input Parameters:
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* NULL
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*
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* Returned Value:
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* Pointer to default network driver on success; null on failure
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*
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****************************************************************************/
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FAR struct net_driver_s *netdev_default(void)
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{
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FAR struct net_driver_s *ret = NULL;
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FAR struct net_driver_s *dev;
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/* Examine each registered network device */
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net_lock();
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for (dev = g_netdevices; dev; dev = dev->flink)
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{
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/* Is the interface in the "up" state? */
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if ((dev->d_flags & IFF_UP) != 0)
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{
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/* Return a reference to the first device that we find in the UP
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* state (but not the loopback device unless it is the only
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* device).
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*/
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ret = dev;
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if (dev->d_lltype != NET_LL_LOOPBACK)
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{
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break;
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}
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}
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}
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net_unlock();
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return ret;
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}
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