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glibc  2.9
sethostid.c
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00001 /* Copyright (C) 1993, 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <unistd.h>
00020 #include <hurd.h>
00021 #include "hurdhost.h"
00022 #include <stdio-common/_itoa.h>
00023 
00024 /* Set the current machine's Internet number to ID.
00025    This call is restricted to the super-user.  */
00026 /* XXX should be __sethostid?
00027        isn't hostid supposed to be hardwired and unchangeable? */
00028 int
00029 sethostid (id)
00030      long int id;
00031 {
00032   char buf[8], *bp;
00033   ssize_t n;
00034 
00035   /* The hostid is kept in the file /etc/hostid,
00036      eight characters of upper-case hexadecimal.  */
00037 
00038   bp = _itoa_word (id, &buf[sizeof buf], 16, 1);
00039   while (bp > buf)
00040     *--bp = '0';
00041 
00042   n = _hurd_set_host_config ("/etc/hostid", buf, sizeof buf);
00043   return n < 0 ? -1 : 0;
00044 }