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-'\" t
-.\" Copyright (c) 2012 YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
-.\" and Copyright (c) 2012 Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH if_nameindex 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-if_nameindex, if_freenameindex \- get network interface names and indexes
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <net/if.h>
-.P
-.BI "struct if_nameindex *if_nameindex(" void );
-.BI "void if_freenameindex(struct if_nameindex *" "ptr" );
-.fi
-.SH DESCRIPTION
-The
-.BR if_nameindex ()
-function returns an array of
-.I if_nameindex
-structures, each containing information
-about one of the network interfaces on the local system.
-The
-.I if_nameindex
-structure contains at least the following entries:
-.P
-.in +4n
-.EX
-unsigned int if_index; /* Index of interface (1, 2, ...) */
-char        *if_name;  /* Null\-terminated name ("eth0", etc.) */
-.EE
-.in
-.P
-The
-.I if_index
-field contains the interface index.
-The
-.I if_name
-field points to the null-terminated interface name.
-The end of the array is indicated by entry with
-.I if_index
-set to zero and
-.I if_name
-set to NULL.
-.P
-The data structure returned by
-.BR if_nameindex ()
-is dynamically allocated and should be freed using
-.BR if_freenameindex ()
-when no longer needed.
-.SH RETURN VALUE
-On success,
-.BR if_nameindex ()
-returns pointer to the array;
-on error, NULL is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.BR if_nameindex ()
-may fail and set
-.I errno
-if:
-.TP
-.B ENOBUFS
-Insufficient resources available.
-.P
-.BR if_nameindex ()
-may also fail for any of the errors specified for
-.BR socket (2),
-.BR bind (2),
-.BR ioctl (2),
-.BR getsockname (2),
-.BR recvmsg (2),
-.BR sendto (2),
-or
-.BR malloc (3).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR if_nameindex (),
-.BR if_freenameindex ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008, RFC\ 3493.
-.SH HISTORY
-glibc 2.1.
-POSIX.1-2001.
-BSDi.
-.P
-Before glibc 2.3.4,
-the implementation supported only interfaces with IPv4 addresses.
-Support of interfaces that don't have IPv4 addresses is available only
-on kernels that support netlink.
-.SH EXAMPLES
-The program below demonstrates the use of the functions described
-on this page.
-An example of the output this program might produce is the following:
-.P
-.in +4n
-.EX
-$ \fB./a.out\fI
-1: lo
-2: wlan0
-3: em1
-.EE
-.in
-.SS Program source
-.\" SRC BEGIN (if_nameindex.c)
-.EX
-#include <net/if.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-\&
-int
-main(void)
-{
-    struct if_nameindex *if_ni, *i;
-\&
-    if_ni = if_nameindex();
-    if (if_ni == NULL) {
-        perror("if_nameindex");
-        exit(EXIT_FAILURE);
-    }
-\&
-    for (i = if_ni; !(i\->if_index == 0 && i\->if_name == NULL); i++)
-        printf("%u: %s\en", i\->if_index, i\->if_name);
-\&
-    if_freenameindex(if_ni);
-\&
-    exit(EXIT_SUCCESS);
-}
-.EE
-.\" SRC END
-.SH SEE ALSO
-.BR getsockopt (2),
-.BR setsockopt (2),
-.BR getifaddrs (3),
-.BR if_indextoname (3),
-.BR if_nametoindex (3),
-.BR ifconfig (8)