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c5a8b997 | 1 | /* Copyright (c) 1998, 2000, 2009 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
090ca000 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
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18 | |
19 | #include <unistd.h> | |
20 | #include <stdlib.h> | |
21 | #include <sys/time.h> | |
22 | #include <bits/libc-lock.h> | |
fa39f7f7 | 23 | #include <rpc/rpc.h> |
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24 | |
25 | /* The RPC code is not threadsafe, but new code should be threadsafe. */ | |
26 | ||
27 | __libc_lock_define_initialized (static, createxid_lock) | |
28 | ||
c5a8b997 | 29 | static pid_t is_initialized; |
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30 | static struct drand48_data __rpc_lrand48_data; |
31 | ||
32 | unsigned long | |
33 | _create_xid (void) | |
34 | { | |
9cfe5381 | 35 | long int res; |
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36 | |
37 | __libc_lock_lock (createxid_lock); | |
38 | ||
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39 | pid_t pid = getpid (); |
40 | if (is_initialized != pid) | |
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41 | { |
42 | struct timeval now; | |
43 | ||
44 | __gettimeofday (&now, (struct timezone *) 0); | |
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45 | __srand48_r (now.tv_sec ^ now.tv_usec ^ pid, |
46 | &__rpc_lrand48_data); | |
47 | is_initialized = pid; | |
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48 | } |
49 | ||
50 | lrand48_r (&__rpc_lrand48_data, &res); | |
51 | ||
52 | __libc_lock_unlock (createxid_lock); | |
53 | ||
54 | return res; | |
55 | } |