/* Copyright (c) 1998, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <unistd.h> #include <stdlib.h> #include <sys/time.h> #include <bits/libc-lock.h> #include <rpc/rpc.h> /* The RPC code is not threadsafe, but new code should be threadsafe. */ __libc_lock_define_initialized (static, createxid_lock) static int is_initialized; static struct drand48_data __rpc_lrand48_data; unsigned long _create_xid (void) { long int res; __libc_lock_lock (createxid_lock); if (!is_initialized) { struct timeval now; __gettimeofday (&now, (struct timezone *) 0); __srand48_r (now.tv_sec ^ now.tv_usec, &__rpc_lrand48_data); is_initialized = 1; } lrand48_r (&__rpc_lrand48_data, &res); __libc_lock_unlock (createxid_lock); return res; }