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1.\" Copyright (c) 1990, 1991 The Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\" notice, this list of conditions and the following disclaimer in the
15.\" documentation and/or other materials provided with the distribution.
16.\" 3. All advertising materials mentioning features or use of this software
17.\" must display the following acknowledgement:
18.\" This product includes software developed by the University of
19.\" California, Berkeley and its contributors.
20.\" 4. Neither the name of the University nor the names of its contributors
21.\" may be used to endorse or promote products derived from this software
22.\" without specific prior written permission.
23.\"
24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34.\" SUCH DAMAGE.
35.\"
36.\" $OpenBSD: rand.3,v 1.4 1998/07/05 19:54:22 millert Exp $
37.\"
38.Dd June 29, 1991
39.Dt RAND 3
40.Os
41.Sh NAME
42.Nm rand ,
43.Nm srand
44.Nd bad random number generator
45.Sh SYNOPSIS
46.Fd #include <stdlib.h>
47.Ft void
48.Fn srand "unsigned seed"
49.Ft int
50.Fn rand void
51.Sh DESCRIPTION
52.Bf -symbolic
53These interfaces are obsoleted by
54.Xr random 3 .
55.Ef
56.Pp
57The
58.Fn rand
59function computes a sequence of pseudo-random integers in the range
60of 0 to
61.Dv RAND_MAX
62(as defined by the header file
63.Aq Pa stdlib.h ) .
64.Pp
65The
66.Fn srand
67function sets its argument as the seed for a new sequence of
68pseudo-random numbers to be returned by
69.Fn rand .
70These sequences are repeatable by calling
71.Fn srand
72with the same seed value.
73.Pp
74If no seed value is provided, the functions are automatically
75seeded with a value of 1.
76.Sh SEE ALSO
77.Xr arc4random 3 ,
78.Xr rand48 3 ,
79.Xr random 3
80.Sh STANDARDS
81The
82.Fn rand
83and
84.Fn srand
85functions
86conform to
87.St -ansiC .