1 /* $NetBSD: getdomainname.c,v 1.13 2012/06/25 22:32:43 abs Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)gethostname.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: getdomainname.c,v 1.13 2012/06/25 22:32:43 abs Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include "namespace.h"
42 #include <sys/param.h>
43 #include <sys/sysctl.h>
44
45 #include <assert.h>
46 #include <errno.h>
47 #include <unistd.h>
48
49 #ifdef __weak_alias
__weak_alias(getdomainname,_getdomainname)50 __weak_alias(getdomainname,_getdomainname)
51 #endif
52
53 int
54 getdomainname(char *name, size_t namelen)
55 {
56 int mib[2];
57 size_t size;
58 int olderrno;
59
60 _DIAGASSERT(name != NULL);
61
62 mib[0] = CTL_KERN;
63 mib[1] = KERN_DOMAINNAME;
64 size = namelen;
65 olderrno = errno;
66 if (sysctl(mib, 2, name, &size, NULL, 0) == -1) {
67 if (errno == ENOMEM) {
68 errno = olderrno;
69 return (0);
70 }
71 return (-1);
72 }
73
74 return (0);
75 }
76