74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
/****************************************************************************
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* libs/libc/net/lib_indextoname.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <net/if.h>
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#include <sys/ioctl.h>
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#include <string.h>
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#include <unistd.h>
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#include <nuttx/net/netconfig.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: if_indextoname
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*
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* Description:
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* The if_indextoname() function maps an interface index to its
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* corresponding name.
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*
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* Input Parameters:
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* ifname - Points to a buffer of at least IF_NAMESIZE bytes.
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* if_indextoname() will place in this buffer the name of the
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* interface with index ifindex.
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*
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* Returned Value:
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* If ifindex is an interface index, then the function will return the
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* value supplied by ifname. Otherwise, the function returns a NULL pointer
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* and sets errno to indicate the error.
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*
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****************************************************************************/
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FAR char *if_indextoname(unsigned int ifindex, FAR char *ifname)
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{
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int sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
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if (sockfd >= 0)
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{
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struct ifreq req;
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req.ifr_ifindex = ifindex;
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if (ioctl(sockfd, SIOCGIFNAME, (unsigned long)&req) >= 0)
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{
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strlcpy(ifname, req.ifr_name, IF_NAMESIZE);
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close(sockfd);
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return ifname;
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}
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close(sockfd);
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}
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return NULL;
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}
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