can_use_af.c revision 1219:f89f56c2d9ac 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30#include "mt.h"
31#include "rpc_mt.h"
32#include <stdio.h>
33#include <fcntl.h>
34#include <sys/types.h>
35#include <sys/socket.h>
36#include <unistd.h>
37#include <net/if.h>
38#include <sys/sockio.h>
39
40/*
41 * Determine if we have a configured interface for the specified address
42 * family.
43 */
44int
45__can_use_af(sa_family_t af)
46{
47	struct lifnum	lifn;
48	int		fd;
49
50	if ((fd =  open("/dev/udp", O_RDONLY)) < 0)
51		return (0);
52	lifn.lifn_family = af;
53	/* XXX Remove this after fixing 6204567 */
54	/* CONSTCOND */
55	lifn.lifn_flags = IFF_UP & !(IFF_NOXMIT | IFF_DEPRECATED);
56	if (ioctl(fd, SIOCGLIFNUM, &lifn, sizeof (lifn)) < 0)
57		lifn.lifn_count = 0;
58
59	(void) close(fd);
60	return (lifn.lifn_count);
61}
62