File: sethostid.c

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/* Copyright (C) 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Bruno Haible <bruno@clisp.org>, 2002.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <unistd.h>
#include <sys/sysctl.h>

/* Set the current machine's Internet number to ID.
   This call is restricted to the super-user.  */

int
sethostid (long int id)
{
  /* Set the "kern.hostid" sysctl value.  */
  int value = id;
  int request[2] = { CTL_KERN, KERN_HOSTID };

  if (__sysctl (request, 2, NULL, NULL, &value, sizeof (value)) < 0)
    return -1;

  return 0;
}