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[glibc/history.git] / sunrpc / create_xid.c
blob4e769186442cf6d778d1890b76b75df692323c37
1 /* Copyright (c) 1998, 2000 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 Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the 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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <unistd.h>
21 #include <stdlib.h>
22 #include <sys/time.h>
23 #include <bits/libc-lock.h>
24 #include <rpc/rpc.h>
26 /* The RPC code is not threadsafe, but new code should be threadsafe. */
28 __libc_lock_define_initialized (static, createxid_lock)
30 static int is_initialized;
31 static struct drand48_data __rpc_lrand48_data;
33 unsigned long
34 _create_xid (void)
36 long int res;
38 __libc_lock_lock (createxid_lock);
40 if (!is_initialized)
42 struct timeval now;
44 __gettimeofday (&now, (struct timezone *) 0);
45 __srand48_r (now.tv_sec ^ now.tv_usec, &__rpc_lrand48_data);
46 is_initialized = 1;
49 lrand48_r (&__rpc_lrand48_data, &res);
51 __libc_lock_unlock (createxid_lock);
53 return res;