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56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Copyright (c) 1998-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <libc-lock.h>
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#include <rpc/rpc.h>
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/* The RPC code is not threadsafe, but new code should be threadsafe. */
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__libc_lock_define_initialized (static, createxid_lock)
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static pid_t is_initialized;
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static struct drand48_data __rpc_lrand48_data;
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unsigned long
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_create_xid (void)
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{
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long int res;
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__libc_lock_lock (createxid_lock);
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pid_t pid = getpid ();
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if (is_initialized != pid)
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{
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struct timeval now;
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__gettimeofday (&now, (struct timezone *) 0);
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__srand48_r (now.tv_sec ^ now.tv_usec ^ pid,
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&__rpc_lrand48_data);
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is_initialized = pid;
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}
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lrand48_r (&__rpc_lrand48_data, &res);
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__libc_lock_unlock (createxid_lock);
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return res;
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}
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