]>
Commit | Line | Data |
---|---|---|
581c785b | 1 | /* Copyright (c) 1998-2022 Free Software Foundation, Inc. |
090ca000 | 2 | This file is part of the GNU C Library. |
090ca000 UD |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
090ca000 UD |
8 | |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
090ca000 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
090ca000 UD |
17 | |
18 | #include <unistd.h> | |
19 | #include <stdlib.h> | |
20 | #include <sys/time.h> | |
ec999b8e | 21 | #include <libc-lock.h> |
fa39f7f7 | 22 | #include <rpc/rpc.h> |
090ca000 UD |
23 | |
24 | /* The RPC code is not threadsafe, but new code should be threadsafe. */ | |
25 | ||
26 | __libc_lock_define_initialized (static, createxid_lock) | |
27 | ||
c5a8b997 | 28 | static pid_t is_initialized; |
090ca000 UD |
29 | static struct drand48_data __rpc_lrand48_data; |
30 | ||
31 | unsigned long | |
32 | _create_xid (void) | |
33 | { | |
9cfe5381 | 34 | long int res; |
090ca000 UD |
35 | |
36 | __libc_lock_lock (createxid_lock); | |
37 | ||
c5a8b997 UD |
38 | pid_t pid = getpid (); |
39 | if (is_initialized != pid) | |
090ca000 | 40 | { |
4a39c34c | 41 | struct timespec now; |
090ca000 | 42 | |
4a39c34c ZW |
43 | __clock_gettime (CLOCK_REALTIME, &now); |
44 | __srand48_r (now.tv_sec ^ now.tv_nsec ^ pid, | |
c5a8b997 UD |
45 | &__rpc_lrand48_data); |
46 | is_initialized = pid; | |
090ca000 UD |
47 | } |
48 | ||
49 | lrand48_r (&__rpc_lrand48_data, &res); | |
50 | ||
51 | __libc_lock_unlock (createxid_lock); | |
52 | ||
53 | return res; | |
54 | } |