Section (3) if_nametoindex
if_nametoindex, if_indextoname — mappings between network interface names and indexes
||const char *ifname
||unsigned int ifindex,|
function returns the index of the network interface
corresponding to the name
function returns the name of the network interface
corresponding to the interface index
ifindex. The name is placed in
the buffer pointed to by
ifname. The buffer must allow
for the storage of at least
returns the index number of the network interface; on error,
0 is returned and
errno is set
error, NULL is returned and
errno is set appropriately.
if_nametoindex() may fail
No interface found with given name.
if_indextoname() may fail
No interface found for the index.
For an explanation of the terms used in this section, see attributes(7).
This page is part of release 4.16 of the Linux
man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
Copyright (c) 2012 YOSHIFUJI Hideaki <yoshfujilinux-ipv6.org>
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided that
the entire resulting derived work is distributed under the terms of
a permission notice identical to this one.
Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume
no responsibility for errors or omissions, or for damages resulting
from the use of the information contained herein. The author(s) may
not have taken the same level of care in the production of this
manual, which is licensed free of charge, as they might when working
Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.