sysdeps/unix/sysv/gethostname.c

   1 /* Copyright (C) 1992, 1995, 1997, 2000, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <sys/utsname.h>
  23
  24 /* Put the name of the current host in no more than LEN bytes of NAME.
  25    The result is null-terminated if LEN is large enough for the full
  26    name and the terminator.  */
  27 int
  28 __gethostname (name, len)
  29      char *name;
  30      size_t len;
  31 {
  32   struct utsname buf;
  33   size_t node_len;
  34
  35   if (uname (&buf))
  36     return -1;
  37
  38   node_len = strlen (buf.nodename) + 1;
  39   memcpy (name, buf.nodename, len < node_len ? len : node_len);
  40
  41   if (node_len > len)
  42     {
  43       __set_errno (ENAMETOOLONG);
  44       return -1;
  45     }
  46   return 0;
  47 }
  48
  49 weak_alias (__gethostname, gethostname)