blob: 46eaaa28dbb7fd6aba776d62606d33bba8f0bfc6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2001-2006
* Oracle Corporation. All rights reserved.
*
* $Id: os_uid.c,v 12.23 2006/09/15 19:24:50 bostic Exp $
*/
#include "db_config.h"
#include "db_int.h"
/*
* __os_unique_id --
* Return a unique 32-bit value.
*
* PUBLIC: void __os_unique_id __P((DB_ENV *, u_int32_t *));
*/
void
__os_unique_id(dbenv, idp)
DB_ENV *dbenv;
u_int32_t *idp;
{
static int first = 1;
pid_t pid;
u_int32_t id, sec, usec;
*idp = 0;
/*
* Our randomized value is comprised of our process ID, the current
* time of day and a stack address, all XOR'd together.
*/
__os_id(dbenv, &pid, NULL);
__os_clock(dbenv, &sec, &usec);
id = (u_int32_t)pid ^ sec ^ usec ^ P_TO_UINT32(&pid);
/*
* We could try and find a reasonable random-number generator, but
* that's not all that easy to do. Seed and use srand()/rand(), if
* we can find them.
*/
if (first == 1) {
srand((u_int)id);
first = 0;
}
id ^= (u_int)rand();
*idp = id;
}
|
