From 6f82d0e8f9756938f04071892206a5af85e676f0 Mon Sep 17 00:00:00 2001 From: cvs2svn Date: Fri, 13 Jul 2012 17:49:56 +0000 Subject: This commit was manufactured by cvs2git to create tag 'eric_g2k12'. --- src/lib/libc/stdlib/random.3 | 185 ------------------------------------------- 1 file changed, 185 deletions(-) delete mode 100644 src/lib/libc/stdlib/random.3 (limited to 'src/lib/libc/stdlib/random.3') diff --git a/src/lib/libc/stdlib/random.3 b/src/lib/libc/stdlib/random.3 deleted file mode 100644 index 84756bb3e3..0000000000 --- a/src/lib/libc/stdlib/random.3 +++ /dev/null @@ -1,185 +0,0 @@ -.\" Copyright (c) 1983, 1991 The Regents of the University of California. -.\" All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" 3. Neither the name of the University nor the names of its contributors -.\" may be used to endorse or promote products derived from this software -.\" without specific prior written permission. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND -.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE -.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -.\" SUCH DAMAGE. -.\" -.\" $OpenBSD: random.3,v 1.20 2012/06/01 01:01:57 guenther Exp $ -.\" -.Dd $Mdocdate: June 1 2012 $ -.Dt RANDOM 3 -.Os -.Sh NAME -.Nm random , -.Nm srandom , -.Nm srandomdev , -.Nm initstate , -.Nm setstate -.Nd better random number generator; routines for changing generators -.Sh SYNOPSIS -.Fd #include -.Ft long -.Fn random void -.Ft void -.Fn srandom "unsigned int seed" -.Ft void -.Fn srandomdev void -.Ft char * -.Fn initstate "unsigned int seed" "char *state" "size_t n" -.Ft char * -.Fn setstate "char *state" -.Sh DESCRIPTION -The -.Fn random -function uses a non-linear additive feedback random number generator employing -a default table of size 31 long integers to return successive pseudo-random -numbers in the range from 0 to (2**31)\-1. -The period of this random number generator is very large, approximately -16*((2**31)\-1). -.Pp -The -.Fn random -and -.Fn srandom -functions have (almost) the same calling sequence and initialization -properties as -.Xr rand 3 Ns / Ns Xr srand 3 . -The difference is that -.Xr rand -produces a much less random sequence \(em in fact, the low dozen bits -generated by rand go through a cyclic pattern. -All the bits generated by -.Fn random -are usable. -For example, -.Sq Li random()&01 -will produce a random binary -value. -.Pp -Like -.Xr rand 3 , -.Fn random -will by default produce a sequence of numbers that can be duplicated -by calling -.Fn srandom -with -.Ql 1 -as the seed. -.Pp -The -.Fn srandomdev -routine initializes a state array using -random numbers obtained from the kernel, -suitable for cryptographic use. -Note that this particular seeding procedure can generate -states which are impossible to reproduce by calling -.Fn srandom -with any value, since the succeeding terms in the -state buffer are no longer derived from the LC algorithm applied to -a fixed seed. -.Pp -The -.Fn initstate -routine allows a state array, passed in as an argument, to be initialized -for future use. -The size of the state array (in bytes) is used by -.Fn initstate -to decide how sophisticated a random number generator it should use \(em the -more state, the better the random numbers will be. -(Current "optimal" values for the amount of state information are -8, 32, 64, 128, and 256 bytes; other amounts will be rounded down to -the nearest known amount. -Using less than 8 bytes will cause an error.) -The seed for the initialization (which specifies a starting point for -the random number sequence, and provides for restarting at the same -point) is also an argument. -The -.Fn initstate -function returns a pointer to the previous state information array. -.Pp -Once a state has been initialized, the -.Fn setstate -routine provides for rapid switching between states. -The -.Fn setstate -function returns a pointer to the previous state array; its -argument state array is used for further random number generation -until the next call to -.Fn initstate -or -.Fn setstate . -.Pp -Once a state array has been initialized, it may be restarted at a -different point either by calling -.Fn initstate -(with the desired seed, the state array, and its size) or by calling -both -.Fn setstate -(with the state array) and -.Fn srandom -(with the desired seed). -The advantage of calling both -.Fn setstate -and -.Fn srandom -is that the size of the state array does not have to be remembered after -it is initialized. -.Pp -With 256 bytes of state information, the period of the random number -generator is greater than 2**69 -which should be sufficient for most purposes. -.Sh DIAGNOSTICS -If -.Fn initstate -is called with less than 8 bytes of state information, or if -.Fn setstate -detects that the state information has been garbled, error -messages are printed on the standard error output. -.Sh SEE ALSO -.Xr arc4random 3 , -.Xr drand48 3 , -.Xr rand 3 , -.Xr random 4 -.Sh STANDARDS -The -.Fn random , -.Fn srandom , -.Fn initstate , -and -.Fn setstate -functions conform to -.St -xpg4.2 . -.Pp -The -.Fn srandomdev -function is an extension. -.Sh HISTORY -These -functions appeared in -.Bx 4.2 . -.Sh AUTHORS -.An Earl T. Cohen -.Sh BUGS -About 2/3 the speed of -.Xr rand 3 . -- cgit v1.2.3-55-g6feb