/* * 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 1.18.332.2 2009/01/18 23:47:41 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 */