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 18 /* David MacKenzie <djm@gnu.ai.mit.edu> */ 19 20 #ifdef HAVE_CONFIG_H 21 # include <config.h> 22 #endif 23 24 #ifdef HAVE_UNAME 25 # include <sys/utsname.h> 26 #endif 27 28 /* Put up to LEN chars of the host name into NAME. 29 Null terminate it if the name is shorter than LEN. 30 Return 0 if ok, -1 if error. */ 31 32 #include <stddef.h> 33 34 int 35 gethostname (char *name, size_t len) 36 { 37 #ifdef HAVE_UNAME 38 struct utsname uts; 39 40 if (uname (&uts) == -1) 41 return -1; 42 if (len > sizeof (uts.nodename)) 43 { 44 /* More space than we need is available. */ 45 name[sizeof (uts.nodename)] = '\0'; 46 len = sizeof (uts.nodename); 47 } 48 strncpy (name, uts.nodename, len); 49 #else 50 strcpy (name, ""); /* Hardcode your system name if you want. */ 51 #endif 52 return 0; 53 } 54