IF_INDEXTONAME
Section: POSIX Programmer's Manual (3P)
Updated: 2017
Page Index
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
if_indextoname
--- map a network interface index to its corresponding name
SYNOPSIS
#include <net/if.h>
char *if_indextoname(unsigned ifindex, char *ifname);
DESCRIPTION
The
if_indextoname()
function shall map an interface index to its corresponding name.
When this function is called,
ifname
shall point to a buffer of at least
{IF_NAMESIZE}
bytes. The function shall place in this buffer the name of the interface
with index
ifindex.
RETURN VALUE
If
ifindex
is an interface index, then the function shall return the value supplied in
ifname,
which points to a buffer now containing the interface name. Otherwise,
the function shall return a null pointer and set
errno
to indicate the error.
ERRORS
The
if_indextoname()
function shall fail if:
- ENXIO
-
The interface does not exist.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
getsockopt(),
if_freenameindex(),
if_nameindex(),
if_nametoindex(),
setsockopt()
The Base Definitions volume of POSIX.1-2017,
<net_if.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .