lib/gethostname.c

   1 /* gethostname emulation for SysV and POSIX.1.
   2    Copyright (C) 1992 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 int
  33 gethostname (name, len)
  34      char *name;
  35      int 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 }