[GitHub] [incubator-nuttx] Ouss4 commented on a change in pull request #3961: net: Add if_nameindex and if_freenameindex API

[GitBox <gi...@apache.org>]

Ouss4 commented on a change in pull request #3961:
URL: https://github.com/apache/incubator-nuttx/pull/3961#discussion_r659072593



##########
File path: libs/libc/net/lib_nameindex.c
##########
@@ -0,0 +1,84 @@
+/****************************************************************************
+ * libs/libc/net/lib_nameindex.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <net/if.h>
+
+#include "libc.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: if_nameindex
+ *
+ * Description:
+ *   The if_nameindex() function returns an array of if_nameindex structures,
+ *   each containing information about one of the network interfaces on the
+ *   local system. The if_nameindex structure contains at least the following
+ *   entries:
+ *         unsigned int if_index;
+ *         FAR char     *if_name;
+ *   The if_index field contains the interface index. The if_name field
+ *   points to the null-terminated interface name.  The end of the array
+ *   is indicated by entry with if_index set to zero and if_name set to NULL.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   On success, if_nameindex() returns pointer to the array; on error, NULL
+ *   is returned, and errno is set to indicate the error.
+ *
+ ****************************************************************************/
+
+FAR struct if_nameindex *if_nameindex(void)
+{
+  FAR struct if_nameindex *ifn;
+  FAR char *buf;
+  int i = 0;
+  int j;
+
+  ifn = lib_malloc((sizeof(*ifn) + IF_NAMESIZE) * MAX_IFINDEX);
+  if (ifn == NULL)
+    {
+      return NULL;

Review comment:
       Should we set `errno` to `ENOBUFS` here?




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