Home | History | Annotate | Line # | Download | only in stdlib 
 $NetBSD: rand.3,v 1.12 2010/03/22 19:30:54 joerg Exp $

 Copyright (c) 1990, 1991, 1993
 The Regents of the University of California. All rights reserved.

 This code is derived from software contributed to Berkeley by
 the American National Standards Committee X3, on Information
 Processing Systems.

 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.

 from: @(#)rand.3 8.1 (Berkeley) 6/4/93

.Dd June 4, 1993
.Dt RAND 3
.Os
.Sh NAME
.Nm rand ,
.Nm srand ,
.Nm rand_r
.Nd bad random number generator
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
n stdlib.h .Ft void
.Fn srand "unsigned int seed"
.Ft int
.Fn rand void
.Ft int
.Fn rand_r "unsigned int *seed"
.Sh DESCRIPTION
f -symbolic These interfaces are obsoleted by
.Xr random 3 .
.Ef

p
The
.Fn rand
function computes a sequence of pseudo-random integers in the range
of 0 to
.Dv RAND_MAX
(as defined by the header file
n stdlib.h ) . 
p
The
.Fn srand
function sets its argument as the seed for a new sequence of
pseudo-random numbers to be returned by
.Fn rand .
These sequences are repeatable by calling
.Fn srand
with the same seed value.

p
If no seed value is provided, the
.Fn rand
function is automatically seeded with a value of 1.

p
The
.Fn rand_r
function is a reentrant interface to
.Fn rand ;
the seed has to be supplied and is maintained by the caller.
.Sh SEE ALSO
.Xr random 3 ,
.Xr rnd 4
.Sh STANDARDS
The
.Fn rand
and
.Fn srand
functions
conform to
.St -ansiC .
The
.Fn rand_r
function conforms to
.St -p1003.1c-95 .