sysdeps/mach/hurd/gethostname.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 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 <ansidecl.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <hurd/port.h>
  24 #include <string.h>
  25
  26 /* Put the name of the current host in no more than LEN bytes of NAME.
  27    The result is null-terminated if LEN is large enough for the full
  28    name and the terminator.  */
  29 int
  30 DEFUN(__gethostname, (name, len),
  31       char *name AND size_t len)
  32 {
  33   error_t err;
  34   char *buf = name;
  35   mach_msg_type_number_t buflen = len;
  36   if (err = __USEPORT (PROC, __proc_gethostname (port, &buf, &buflen)))
  37     return __hurd_fail (err);
  38   if (buf != name)
  39     {
  40       memcpy (name, buf, len < buflen ? len : buflen);
  41       __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
  42     }
  43   if (buflen > len)
  44     return __hurd_fail (ENAMETOOLONG);
  45   return 0;
  46 }
  47
  48 weak_alias (__gethostname, gethostname)