libs/gethostname.c

   1 /* -*-c-*- */
   2 /* gethostname emulation for SysV and POSIX.1.
   3    Copyright (C) 1992 Free Software Foundation, Inc. */
   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 of the License, or
   7  * (at your option) 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
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18 /* David MacKenzie <djm@gnu.ai.mit.edu> */
  19
  20 #include "config.h"
  21
  22 #ifdef HAVE_UNAME
  23 # include <sys/utsname.h>
  24 #endif
  25
  26 /* Put up to LEN chars of the host name into NAME.
  27    Null terminate it if the name is shorter than LEN.
  28    Return 0 if ok, -1 if error.  */
  29
  30 int gethostname(char *name, int len)
  31 {
  32 #ifdef HAVE_UNAME
  33         struct utsname uts;
  34
  35         if (uname (&uts) == -1)
  36                 return -1;
  37         if (len > sizeof (uts.nodename))
  38         {
  39                 /* More space than we need is available.  */
  40                 name[sizeof (uts.nodename)] = '\0';
  41                 len = sizeof (uts.nodename);
  42         }
  43         strncpy (name, uts.nodename, len);
  44 #else
  45         /* Hardcode your system name if you want.  */
  46         strcpy (name, "");
  47 #endif
  48         return 0;
  49 }