sysdeps/unix/sysv/linux/gethostname.c

   1 /* Copyright (C) 1992, 1995 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, 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
  34   if (name == NULL)
  35     {
  36       errno = EINVAL;
  37       return -1;
  38     }
  39
  40   if (uname (&buf))
  41     return -1;
  42
  43   if (strlen (buf.nodename) + 1 > len)
  44     {
  45       errno = EINVAL;
  46       return -1;
  47     }
  48
  49   strcpy (name, buf.nodename);
  50   return 0;
  51 }
  52
  53 weak_alias (__gethostname, gethostname)