61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
|
|
* Copyright (C) 1999-2001 Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
|
|
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
|
|
* INTERNET SOFTWARE CONSORTIUM 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 1.11 2001/01/09 21:57:23 bwelling Exp $ */
|
|
|
|
#ifndef ISC_RANDOM_H
|
|
#define ISC_RANDOM_H 1
|
|
|
|
#include <isc/lang.h>
|
|
#include <isc/types.h>
|
|
|
|
/*
|
|
* Implements a random state pool which will let the caller return a
|
|
* series of possibly non-reproducable 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 */
|