getdomainname.c revision 1.10 
11.10Sis/*	$NetBSD: getdomainname.c,v 1.10 1999/11/18 22:12:53 is Exp $	*/
21.2Scgd
31.1Scgd/*
41.1Scgd * Copyright (c) 1989, 1993
51.1Scgd *	The Regents of the University of California.  All rights reserved.
61.1Scgd *
71.1Scgd * Redistribution and use in source and binary forms, with or without
81.1Scgd * modification, are permitted provided that the following conditions
91.1Scgd * are met:
101.1Scgd * 1. Redistributions of source code must retain the above copyright
111.1Scgd *    notice, this list of conditions and the following disclaimer.
121.1Scgd * 2. Redistributions in binary form must reproduce the above copyright
131.1Scgd *    notice, this list of conditions and the following disclaimer in the
141.1Scgd *    documentation and/or other materials provided with the distribution.
151.1Scgd * 3. All advertising materials mentioning features or use of this software
161.1Scgd *    must display the following acknowledgement:
171.1Scgd *	This product includes software developed by the University of
181.1Scgd *	California, Berkeley and its contributors.
191.1Scgd * 4. Neither the name of the University nor the names of its contributors
201.1Scgd *    may be used to endorse or promote products derived from this software
211.1Scgd *    without specific prior written permission.
221.1Scgd *
231.1Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
241.1Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
251.1Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
261.1Scgd * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
271.1Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
281.1Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
291.1Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
301.1Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
311.1Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
321.1Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
331.1Scgd * SUCH DAMAGE.
341.1Scgd */
351.1Scgd
361.4Schristos#include <sys/cdefs.h>
371.1Scgd#if defined(LIBC_SCCS) && !defined(lint)
381.2Scgd#if 0
391.2Scgdstatic char sccsid[] = "@(#)gethostname.c	8.1 (Berkeley) 6/4/93";
401.2Scgd#else
411.10Sis__RCSID("$NetBSD: getdomainname.c,v 1.10 1999/11/18 22:12:53 is Exp $");
421.2Scgd#endif
431.1Scgd#endif /* LIBC_SCCS and not lint */
441.1Scgd
451.5Sjtc#include "namespace.h"
461.1Scgd#include <sys/param.h>
471.1Scgd#include <sys/sysctl.h>
481.8Slukem
491.8Slukem#include <assert.h>
501.8Slukem#include <errno.h>
511.4Schristos#include <unistd.h>
521.7Skleink
531.7Skleink#ifdef __weak_alias
541.7Skleink__weak_alias(getdomainname,_getdomainname);
551.7Skleink#endif
561.1Scgd
571.3Sjtcint
581.1Scgdgetdomainname(name, namelen)
591.1Scgd	char *name;
601.6Skleink	size_t namelen;
611.1Scgd{
621.1Scgd	int mib[2];
631.1Scgd	size_t size;
641.10Sis	int olderrno;
651.8Slukem
661.8Slukem	_DIAGASSERT(name != NULL);
671.1Scgd
681.1Scgd	mib[0] = CTL_KERN;
691.1Scgd	mib[1] = KERN_DOMAINNAME;
701.1Scgd	size = namelen;
711.10Sis	olderrno = errno;
721.10Sis	if (sysctl(mib, 2, name, &size, NULL, 0) == -1) {
731.10Sis		if (errno == ENOMEM) {
741.10Sis			errno = olderrno;
751.10Sis			return (0);
761.10Sis		}
771.1Scgd		return (-1);
781.10Sis	}
791.10Sis
801.1Scgd	return (0);
811.1Scgd}
82