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if_nametoindex, if_indextoname — mappings between network interface names and indexes
#include <net/if.h>
unsigned int
if_nametoindex( |
const char *ifname); |
char
*if_indextoname( |
unsigned int ifindex, |
char *ifname); |
The if_nametoindex()
function returns the index of the network interface
corresponding to the name ifname.
The if_indextoname()
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 IF_NAMESIZE bytes.
On success, if_nametoindex()
returns the index number of the network interface; on error,
0 is returned and errno is set
appropriately.
On success, if_indextoname()
returns ifname; on
error, NULL is returned and errno is set appropriately.
if_indextoname() may fail
and set errno if:
No interface found for the index.
if_nametoindex() and
if_indextoname() may also fail
for any of the errors specified for socket(2) or ioctl(2).
This page is part of release 3.52 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man−pages/.
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Copyright (c) 2012 YOSHIFUJI Hideaki <yoshfujilinux-ipv6.org> %%%LICENSE_START(VERBATIM) 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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |