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/*
* Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: random.h,v 1.20 2009/01/17 23:47:43 tbox Exp $ */
#ifndef ISC_RANDOM_H
#define ISC_RANDOM_H 1
#include <isc/lang.h>
#include <isc/types.h>
/*! \file isc/random.h
* \brief Implements a random state pool which will let the caller return a
* series of possibly non-reproducible random values.
*
* Note that the
* strength of these numbers is not all that high, and should not be
* used in cryptography functions. It is useful for jittering values
* a bit here and there, such as timeouts, etc.
*/
ISC_LANG_BEGINDECLS
void
isc_random_seed(isc_uint32_t seed);
/*%<
* Set the initial seed of the random state.
*/
void
isc_random_get(isc_uint32_t *val);
/*%<
* Get a random value.
*
* Requires:
* val != NULL.
*/
isc_uint32_t
isc_random_jitter(isc_uint32_t max, isc_uint32_t jitter);
/*%<
* Get a random value between (max - jitter) and (max).
* This is useful for jittering timer values.
*/
ISC_LANG_ENDDECLS
#endif /* ISC_RANDOM_H */