1 /* gethostname emulation for SysV and POSIX.1. 2 Copyright (C) 1992, 2003 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 17 #include <sys/cdefs.h> 18 __RCSID("$NetBSD: gethostname.c,v 1.2 2016/05/17 14:00:09 christos Exp $"); 19 20 21 /* David MacKenzie <djm@gnu.ai.mit.edu> */ 22 23 #ifdef HAVE_CONFIG_H 24 # include <config.h> 25 #endif 26 27 #ifdef HAVE_UNAME 28 # include <sys/utsname.h> 29 #endif 30 31 /* Put up to LEN chars of the host name into NAME. 32 Null terminate it if the name is shorter than LEN. 33 Return 0 if ok, -1 if error. */ 34 35 #include <stddef.h> 36 37 int 38 gethostname (char *name, size_t len) 39 { 40 #ifdef HAVE_UNAME 41 struct utsname uts; 42 43 if (uname (&uts) == -1) 44 return -1; 45 if (len > sizeof (uts.nodename)) 46 { 47 /* More space than we need is available. */ 48 name[sizeof (uts.nodename)] = '\0'; 49 len = sizeof (uts.nodename); 50 } 51 strncpy (name, uts.nodename, len); 52 #else 53 strcpy (name, ""); /* Hardcode your system name if you want. */ 54 #endif 55 return 0; 56 } 57