mirror of
https://github.com/lcn2/calc.git
synced 2025-08-19 01:13:27 +03:00
a31078bbec
Some folks might think: “you still use RCS”?!? And we will say, hey, at least we switched from SCCS to RCS back in … I think it was around 1994 ... at least we are keeping up! :-) :-) :-) Logs say that SCCS version 18 became RCS version 19 on 1994 March 18. RCS served us well. But now it is time to move on. And so we are switching to git. Calc releases produce a lot of file changes. In the 125 releases of calc since 1996, when I started managing calc releases, there have been 15473 file mods!
75 lines
2.4 KiB
Plaintext
75 lines
2.4 KiB
Plaintext
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.
|
|
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
##
|
|
## Under source code control: 1999/10/03 10:04:29
|
|
## File existed as early as: 1999
|
|
##
|
|
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
|
|
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|