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-.\"     $OpenBSD: if_indextoname.3,v 1.11 2007/05/31 19:19:30 jmc Exp $
-.\" Copyright (c) 1983, 1991, 1993
-.\"     The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     From: @(#)rcmd.3        8.1 (Berkeley) 6/4/93
-.\"
-.Dd $Mdocdate: May 31 2007 $
-.Dt IF_NAMETOINDEX 3
-.Os
-.Sh NAME
-.Nm if_nametoindex ,
-.Nm if_indextoname ,
-.Nm if_nameindex ,
-.Nm if_freenameindex
-.Nd convert interface index to name, and vice versa
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/socket.h>
-.Fd #include <net/if.h>
-.Ft "unsigned int"
-.Fn if_nametoindex "const char *ifname"
-.Ft "char *"
-.Fn if_indextoname "unsigned int ifindex" "char *ifname"
-.Ft "struct if_nameindex *"
-.Fn if_nameindex "void"
-.Ft "void"
-.Fn if_freenameindex "struct if_nameindex *ptr"
-.Sh DESCRIPTION
-These functions map interface indexes to interface names (such as
-.Dq lo0 ) ,
-and vice versa.
-.Pp
-The
-.Fn if_nametoindex
-function converts an interface name specified by the
-.Fa ifname
-argument to an interface index (positive integer value).
-If the specified interface does not exist, 0 will be returned.
-.Pp
-.Fn if_indextoname
-converts an interface index specified by the
-.Fa ifindex
-argument to an interface name.
-The
-.Fa ifname
-argument must point to a buffer of at least
-.Dv IF_NAMESIZE
-bytes into which the interface name corresponding to the specified index is
-returned.
-.Pf ( Dv IF_NAMESIZE
-is also defined in
-.Aq Pa net/if.h
-and its value includes a terminating NUL byte at the end of the
-interface name.)
-This pointer is also the return value of the function.
-If there is no interface corresponding to the specified index,
-.Dv NULL
-is returned.
-.Pp
-.Fn if_nameindex
-returns an array of
-.Vt if_nameindex
-structures.
-.Vt if_nameindex
-is also defined in
-.Aq Pa net/if.h ,
-and is as follows:
-.Bd -literal -offset indent
-struct if_nameindex {
-        unsigned int      if_index;     /* 1, 2, ... */
-        char             *if_name;      /* NUL-terminated name */
-};
-.Ed
-.Pp
-The end of the array of structures is indicated by a structure with
-an
-.Fa if_index
-of 0 and an
-.Fa if_name
-of
-.Dv NULL .
-The function returns a null pointer on error.
-The memory used for this array of structures along with the interface
-names pointed to by the
-.Fa if_name
-members is obtained dynamically.
-This memory is freed by the
-.Fn if_freenameindex
-function.
-.Pp
-.Fn if_freenameindex
-takes a pointer that was returned by
-.Fn if_nameindex
-as argument
-.Pq Fa ptr ,
-and it reclaims the region allocated.
-.Sh DIAGNOSTICS
-.Fn if_nametoindex
-returns 0 on error, positive integer on success.
-.Fn if_indextoname
-and
-.Fn if_nameindex
-return
-.Dv NULL
-on errors.
-.Sh SEE ALSO
-.Xr getifaddrs 3 ,
-.Xr networking 4
-.Rs
-.%A R. Gilligan
-.%A S. Thomson
-.%A J. Bound
-.%A W. Stevens
-.%T Basic Socket Interface Extensions for IPv6
-.%R RFC 2553
-.%D March 1999
-.Re
-.Sh STANDARDS
-These functions are defined in ``Basic Socket Interface Extensions for IPv6''
-.Pq RFC 2533 .