/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
*/
#include "mt.h"
#include "rpc_mt.h"
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/sockio.h>
/*
* Determine if any network interface is present that supports the specified
* address family, af. The status of the interface is not important.
*
* getifaddrs(3SOCKET) could be used to replace the SIOCGLIFNUM ioctl()
* call being used, however, SIOCFGLIFNUM is the right choice because of
* its speed and simplicity. Given this function's purpose, using
* getifaddrs() would be excessive.
*/
int
__can_use_af(sa_family_t af)
{
struct lifnum lifn;
int fd;
if ((fd = open("/dev/udp", O_RDONLY)) < 0) {
return (0);
}
lifn.lifn_family = af;
lifn.lifn_flags = 0;
if (ioctl(fd, SIOCGLIFNUM, &lifn, sizeof (lifn)) < 0) {
lifn.lifn_count = 0;
}
(void) close(fd);
return (lifn.lifn_count);
}