if_indextoname(3p)
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 IEEE Std 1003.1-2001,
<net/if.h>
COPYRIGHT
- Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .