mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* Copyright (c) 1998-2017 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <sys/time.h>
|
|
#include <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 pid_t is_initialized;
|
|
static struct drand48_data __rpc_lrand48_data;
|
|
|
|
unsigned long
|
|
_create_xid (void)
|
|
{
|
|
long int res;
|
|
|
|
__libc_lock_lock (createxid_lock);
|
|
|
|
pid_t pid = getpid ();
|
|
if (is_initialized != pid)
|
|
{
|
|
struct timeval now;
|
|
|
|
__gettimeofday (&now, (struct timezone *) 0);
|
|
__srand48_r (now.tv_sec ^ now.tv_usec ^ pid,
|
|
&__rpc_lrand48_data);
|
|
is_initialized = pid;
|
|
}
|
|
|
|
lrand48_r (&__rpc_lrand48_data, &res);
|
|
|
|
__libc_lock_unlock (createxid_lock);
|
|
|
|
return res;
|
|
}
|