1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if defined(LIBC_SCCS) && !defined(lint) 31static char sccsid[] = "@(#)gethostname.c 8.1 (Berkeley) 6/4/93"; 32#endif /* LIBC_SCCS and not lint */ 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: src/lib/libc/gen/gethostname.c,v 1.8 2007/01/09 00:27:54 imp Exp $"); 35 36#include <string.h> 37#include <sys/param.h> 38#include <sys/sysctl.h> 39#include <limits.h> 40 41#include <errno.h> 42#include <unistd.h> 43 44int 45gethostname(name, namelen) 46 char *name; 47 size_t namelen; 48{ 49 int mib[2]; 50 51 mib[0] = CTL_KERN; 52 mib[1] = KERN_HOSTNAME; 53 if (namelen < MAXHOSTNAMELEN + 1) { 54 char local_buf[MAXHOSTNAMELEN + 1]; 55 size_t local_len = sizeof(local_buf); 56 if (sysctl(mib, 2, local_buf, &local_len, NULL, 0) == -1) { 57 if (errno == ENOMEM) 58 errno = ENAMETOOLONG; 59 return (-1); 60 } 61 strncpy(name, local_buf, namelen); 62 name[namelen - 1] = 0; 63 } else { 64 if (sysctl(mib, 2, name, &namelen, NULL, 0) == -1) { 65 if (errno == ENOMEM) 66 errno = ENAMETOOLONG; 67 return (-1); 68 } 69 } 70 return (0); 71} 72