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/* $Id: rand.cpp $ */
/** @file
* IPRT - Random Numbers.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/rand.h>
#include "internal/iprt.h"
#include <iprt/time.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/errcore.h>
#include <iprt/assert.h>
#include <iprt/thread.h>
#include <iprt/once.h>
#include "internal/rand.h"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** For lazily initializing of the random generator. */
static RTONCE g_rtRandOnce = RTONCE_INITIALIZER;
/** The default random generator. */
static RTRAND g_hRand = NIL_RTRAND;
/**
* Perform lazy initialization.
*
* @returns IPRT status code.
* @param pvUser Ignored.
*/
static DECLCALLBACK(int) rtRandInitOnce(void *pvUser)
{
RTRAND hRand;
int rc = RTRandAdvCreateSystemFaster(&hRand);
if (RT_FAILURE(rc))
rc = RTRandAdvCreateParkMiller(&hRand);
if (RT_SUCCESS(rc))
{
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
RTRandAdvSeed(hRand, ASMReadTSC() >> 8);
#else
RTRandAdvSeed(hRand, RTTimeNanoTS() >> 8);
#endif
g_hRand = hRand;
}
else
AssertRC(rc);
NOREF(pvUser);
return rc;
}
/**
* Termination counterpart to rtRandInitOnce.
*
* @returns IPRT status code.
* @param pvUser Ignored.
* @param fLazyCleanUpOk Set if we're terminating the process.
*/
static DECLCALLBACK(void) rtRandTermOnce(void *pvUser, bool fLazyCleanUpOk)
{
if (!fLazyCleanUpOk)
{
RTRAND hRand = g_hRand;
g_hRand = NIL_RTRAND;
if (hRand != NIL_RTRAND)
{
int rc = RTRandAdvDestroy(hRand);
AssertRC(rc);
}
}
NOREF(pvUser);
}
RTDECL(void) RTRandBytes(void *pv, size_t cb) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
RTRandAdvBytes(g_hRand, pv, cb);
}
RT_EXPORT_SYMBOL(RTRandBytes);
RTDECL(uint32_t) RTRandU32Ex(uint32_t u32First, uint32_t u32Last) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvU32Ex(g_hRand, u32First, u32Last);
}
RT_EXPORT_SYMBOL(RTRandU32Ex);
RTDECL(uint32_t) RTRandU32(void) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvU32(g_hRand);
}
RT_EXPORT_SYMBOL(RTRandU32);
RTDECL(int32_t) RTRandS32Ex(int32_t i32First, int32_t i32Last) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvS32Ex(g_hRand, i32First, i32Last);
}
RT_EXPORT_SYMBOL(RTRandS32Ex);
RTDECL(int32_t) RTRandS32(void) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvS32(g_hRand);
}
RT_EXPORT_SYMBOL(RTRandS32);
RTDECL(uint64_t) RTRandU64Ex(uint64_t u64First, uint64_t u64Last) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvU64Ex(g_hRand, u64First, u64Last);
}
RT_EXPORT_SYMBOL(RTRandU64Ex);
RTDECL(uint64_t) RTRandU64(void) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvU64(g_hRand);
}
RT_EXPORT_SYMBOL(RTRandU64);
RTDECL(int64_t) RTRandS64Ex(int64_t i64First, int64_t i64Last) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvS64Ex(g_hRand, i64First, i64Last);
}
RT_EXPORT_SYMBOL(RTRandS64Ex);
RTDECL(int64_t) RTRandS64(void) RT_NO_THROW_DEF
{
RTOnceEx(&g_rtRandOnce, rtRandInitOnce, rtRandTermOnce, NULL);
return RTRandAdvS32(g_hRand);
}
RT_EXPORT_SYMBOL(RTRandS64);
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