source: projects/initscripts/tags/initscripts-8.91.3/src/genhostid.c @ 1108

Revision 1108, 1.2 KB checked in by daisuke, 13 years ago (diff)

import initscripts-8.90.6 from internal cvs repository

Line 
1/* Copyright (C) 2003 Red Hat, Inc.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License, version 2,
5 * as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
15 *         
16 */
17
18#include <fcntl.h>
19#include <stdlib.h>
20#include <time.h>
21#include <unistd.h>
22#include <sys/stat.h>
23int
24main (void)
25{
26  struct stat st;
27  long int n;
28  if (stat ("/etc/hostid", &st) == 0 && S_ISREG (st.st_mode)
29      && st.st_size >= sizeof (n))
30    return 0;
31  int fd = open ("/dev/random", O_RDONLY);
32  if (fd == -1 || read (fd, &n, sizeof (n)) != sizeof (n))
33    {
34      srand48 ((long int) time (NULL) ^ (long int) getpid ());
35      n = lrand48 ();
36    }
37  return sethostid ((int32_t)n);
38}
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