Update copyright dates with scripts/update-copyrights
[glibc.git] / sunrpc / create_xid.c
blob74e14579d33b35e7b1adebee9487c6d5a02cea36
1 /* Copyright (c) 1998-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
18 #include <unistd.h>
19 #include <stdlib.h>
20 #include <sys/time.h>
21 #include <libc-lock.h>
22 #include <rpc/rpc.h>
24 /* The RPC code is not threadsafe, but new code should be threadsafe. */
26 __libc_lock_define_initialized (static, createxid_lock)
28 static pid_t is_initialized;
29 static struct drand48_data __rpc_lrand48_data;
31 unsigned long
32 _create_xid (void)
34 long int res;
36 __libc_lock_lock (createxid_lock);
38 pid_t pid = getpid ();
39 if (is_initialized != pid)
41 struct timespec now;
43 __clock_gettime (CLOCK_REALTIME, &now);
44 __srand48_r (now.tv_sec ^ now.tv_nsec ^ pid,
45 &__rpc_lrand48_data);
46 is_initialized = pid;
49 lrand48_r (&__rpc_lrand48_data, &res);
51 __libc_lock_unlock (createxid_lock);
53 return res;