gl/gethostname.c

   1 /* gethostname emulation for SysV and POSIX.1.
   2
   3    Copyright (C) 1992, 2003, 2006 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* David MacKenzie <djm@gnu.ai.mit.edu> */
  20
  21 #include <config.h>
  22
  23 #ifdef HAVE_UNAME
  24 # include <sys/utsname.h>
  25 #endif
  26
  27 /* Put up to LEN chars of the host name into NAME.
  28    Null terminate it if the name is shorter than LEN.
  29    Return 0 if ok, -1 if error.  */
  30
  31 #include <stddef.h>
  32
  33 int
  34 gethostname (char *name, size_t len)
  35 {
  36 #ifdef HAVE_UNAME
  37   struct utsname uts;
  38
  39   if (uname (&uts) == -1)
  40     return -1;
  41   if (len > sizeof (uts.nodename))
  42     {
  43       /* More space than we need is available.  */
  44       name[sizeof (uts.nodename)] = '\0';
  45       len = sizeof (uts.nodename);
  46     }
  47   strncpy (name, uts.nodename, len);
  48 #else
  49   strcpy (name, "");            /* Hardcode your system name if you want.  */
  50 #endif
  51   return 0;
  52 }