NAME seed - return a value that may be used to seed a pseudo-random generator SYNOPSIS seed() TYPES return integer DESCRIPTION Generate a pseudo-random seed based on a collection of system and process information. The seed() builtin function returns a value: 0 <= seed < 2^64 IMPORTANT WARNING: It should be pointed out that the information collected by seed is almost certainly non-chaotic. This function is likely not suitable for applications (such as cryptographic applications) where the unpredictability of seeds is critical. For such critical applications, LavaRnd should be used. See the URL: http://www.LavaRnd.org/ for information about seeding a pseudo-random number generator (such as rand() or random()) with the cryptographic hash of the digitization of chaotic system. Given the above warning, this builtin function produces a seed that is suitable for most applications that desire a different pseudo-random sequence each time they are run. The return value of this builtin function should NOT be considered a random or pseudo-random value. The return value should be used as an argument to a seed function such as srand() or srandom(). EXAMPLE > print srand(seed()) RAND state > print srandom(seed()) RAND state LIMITS none LINK LIBRARY NUMBER *pseudo_seed(void) SEE ALSO seed, srand, randbit, isrand, rand, random, srandom, israndom ## Copyright (C) 1999 Landon Curt Noll ## ## Calc is open software; you can redistribute it and/or modify it under ## the terms of the version 2.1 of the GNU Lesser General Public License ## as published by the Free Software Foundation. ## ## Calc 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. ## ## A copy of version 2.1 of the GNU Lesser General Public License is ## distributed with calc under the filename COPYING-LGPL. You should have ## received a copy with calc; if not, write to Free Software Foundation, Inc. ## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. ## ## @(#) $Revision: 29.3 $ ## @(#) $Id: seed,v 29.3 2001/05/13 13:26:26 chongo Exp $ ## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/seed,v $ ## ## Under source code control: 1999/10/03 10:04:29 ## File existed as early as: 1999 ## ## chongo /\oo/\ http://www.isthe.com/chongo/ ## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/