Update.
[glibc.git] / sunrpc / create_xid.c
blob15fb367bca8f9519167f83c4017291a3a7ac8b37
1 /* Copyright (c) 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
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.
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.
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. */
20 #include <unistd.h>
21 #include <stdlib.h>
22 #include <sys/time.h>
23 #include <bits/libc-lock.h>
25 /* The RPC code is not threadsafe, but new code should be threadsafe. */
27 __libc_lock_define_initialized (static, createxid_lock)
29 static int is_initialized;
30 static struct drand48_data __rpc_lrand48_data;
32 unsigned long
33 _create_xid (void)
35 unsigned long res;
37 __libc_lock_lock (createxid_lock);
39 if (!is_initialized)
41 struct timeval now;
43 __gettimeofday (&now, (struct timezone *) 0);
44 srand48_r (now.tv_sec ^ now.tv_usec, &__rpc_lrand48_data);
45 is_initialized = 1;
48 lrand48_r (&__rpc_lrand48_data, &res);
50 __libc_lock_unlock (createxid_lock);
52 return res;