87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
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/****************************************************************************
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* libs/libc/net/lib_nameindex.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 <errno.h>
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#include "libc.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_nameindex
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*
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* Description:
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* The if_nameindex() function returns an array of if_nameindex structures,
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* each containing information about one of the network interfaces on the
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* local system. The if_nameindex structure contains at least the following
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* entries:
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* unsigned int if_index;
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* FAR char *if_name;
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* The if_index field contains the interface index. The if_name field
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* points to the null-terminated interface name. The end of the array
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* is indicated by entry with if_index set to zero and if_name set to NULL.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* On success, if_nameindex() returns pointer to the array; on error, NULL
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* is returned, and errno is set to indicate the error.
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*
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****************************************************************************/
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FAR struct if_nameindex *if_nameindex(void)
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{
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FAR struct if_nameindex *ifn;
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FAR char *buf;
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int i = 0;
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int j;
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ifn = lib_malloc((sizeof(*ifn) + IF_NAMESIZE) * MAX_IFINDEX);
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if (ifn == NULL)
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{
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set_errno(ENOBUFS);
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return NULL;
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}
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buf = (FAR char *)(ifn + MAX_IFINDEX);
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for (j = 1; j <= MAX_IFINDEX; j++)
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{
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ifn[i].if_name = if_indextoname(j, buf);
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if (ifn[i].if_name)
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{
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ifn[i++].if_index = j;
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buf += IF_NAMESIZE;
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}
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}
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ifn[i].if_name = NULL;
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ifn[i].if_index = 0;
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return ifn;
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}
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