102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/****************************************************************************
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* net/netdev/netdev_findbyindex.c
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*
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* Copyright (C) 2015 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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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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#include <string.h>
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#include <errno.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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* Function: netdev_findbyindex
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*
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* Description:
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* Find a previously registered network device by its position in the
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* list of registered devices. NOTE that this function is not a safe way
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* to enumerate network devices: There could be changes to the list of
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* registered device causing a given index to be meaningless (unless, of
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* course, the caller keeps the network locked).
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*
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* Parameters:
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* index - the index of the interface to file
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*
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* Returned Value:
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* Pointer to driver on success; NULL on failure. This function can only
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* fail if there are fewer registered interfaces than could be indexed.
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*
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* Assumptions:
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* Called from normal user mode
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*
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****************************************************************************/
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FAR struct net_driver_s *netdev_findbyindex(int index)
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{
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#ifdef CONFIG_NETDEV_MULTINIC
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FAR struct net_driver_s *dev;
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net_lock_t save;
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int i;
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save = net_lock();
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for (i = 0, dev = g_netdevices; dev; i++, dev = dev->flink)
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{
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if (i == index)
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{
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net_unlock(save);
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return dev;
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}
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}
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net_unlock(save);
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return NULL;
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#else
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return (index == 0) ? g_netdevices : NULL;
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#endif
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}
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#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS */
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