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4aebaa6b | 1 | /* Copyright (c) 1998, 2000 Free Software Foundation, Inc. |
090ca000 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include <unistd.h> | |
21 | #include <stdlib.h> | |
22 | #include <sys/time.h> | |
23 | #include <bits/libc-lock.h> | |
24 | ||
25 | /* The RPC code is not threadsafe, but new code should be threadsafe. */ | |
26 | ||
27 | __libc_lock_define_initialized (static, createxid_lock) | |
28 | ||
29 | static int is_initialized; | |
30 | static struct drand48_data __rpc_lrand48_data; | |
31 | ||
32 | unsigned long | |
33 | _create_xid (void) | |
34 | { | |
35 | unsigned long res; | |
36 | ||
37 | __libc_lock_lock (createxid_lock); | |
38 | ||
39 | if (!is_initialized) | |
40 | { | |
41 | struct timeval now; | |
42 | ||
43 | __gettimeofday (&now, (struct timezone *) 0); | |
4aebaa6b | 44 | __srand48_r (now.tv_sec ^ now.tv_usec, &__rpc_lrand48_data); |
090ca000 UD |
45 | is_initialized = 1; |
46 | } | |
47 | ||
48 | lrand48_r (&__rpc_lrand48_data, &res); | |
49 | ||
50 | __libc_lock_unlock (createxid_lock); | |
51 | ||
52 | return res; | |
53 | } |