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Man page of IF_NAMETOINDEX
IF_NAMETOINDEX
Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
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NAME
if_nametoindex, if_indextoname - mappings between network interface
names and indexes
SYNOPSIS
#include <net/if.h>
unsigned int if_nametoindex(const char *ifname);
char *if_indextoname(unsigned int ifindex, char *ifname);
DESCRIPTION
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.
RETURN VALUE
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.
ERRORS
if_indextoname()
may fail and set
errno
if:
- ENXIO
-
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).
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
if_nametoindex(),
if_indextoname()
| Thread safety | MT-Safe
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, RFC 3493.
This function first appeared in BSDi.
SEE ALSO
getifaddrs(3),
if_nameindex(3),
ifconfig(8)
COLOPHON
This page is part of release 4.09 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
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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