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.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" References consulted:
.\" Linux libc source code
.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\" 386BSD man pages
.\" Modified Sun Mar 28 00:25:51 1993, David Metcalfe
.\" Modified Sat Jul 24 18:13:39 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sun Aug 20 21:47:07 2000, aeb
.\"
.\" Japanese Version Copyright (c) 1997 YOSHINO Takashi
.\" all rights reserved.
.\" Translated Tue Jan 21 21:04:41 JST 1997
.\" by YOSHINO Takashi <yoshino@civil.jcn.nihon-u.ac.jp>
.\"
.\" WORD: non-linear additive feedback ˡեɥХå
.\" WORD: state array
.\"
.TH RANDOM 3 2007-07-26 "GNU" "Linux Programmer's Manual"
.SH ̾
random, srandom, initstate, setstate \- ؿ
.SH
.nf
.B #include <stdlib.h>
.sp
.B long int random(void);
.br
.BI "void srandom(unsigned int " seed );
.BI "char *initstate(unsigned int " seed ", char *" state ", size_t " n );
.BI "char *setstate(char *" state );
.fi
.sp
.in -4n
glibc εǽޥ
.RB ( feature_test_macros (7)
):
.in
.sp
.ad l
.BR random (),
.BR srandom (),
.BR initstate (),
.BR setstate ():
_SVID_SOURCE || |_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500
.ad b
.SH
.BR random ()
ؿϡˡեɥХåѤؿǤ롣
δؿϡ0 \fBRAND_MAX\fR ޤǤε֤
Τ 31 ĤΥʤǥեȤɽѤ롣
ؿμϤȤƤĹ褽 16*((2**31)\-1) Ǥ롣
.PP
.BR srandom ()
ؿϡ
.BR random ()
֤뵿μꤹ롣
ΤˤϿˤ
.BR srandom ()
Ƥ٤Ф褤
.BR random ()
ϡ
ƱͤѤ
.BR srandom ()
Ƥ֤ȤǺƸǽǤ롣
ͤͿʤˤ
.BR random ()
ؿϡưŪ 1 ꤹ롣
.PP
.BR initstate ()
ؿϡ
.BR random ()
ǻѤ
\fIstate\fP 롣
.BR initstate ()
Ǥϡ礭 \fIn\fP
Ѥؿǽ٤ꤹ뤿˻Ѥ
\(em 礭ǽϤ褯ʤ롣
\fIseed\fP ϽΤμǤ롣
γϰ֤ꤹΤǤꡢ
ͤꤹ뤳ȤƱγϰ֤
Ƴ뤳ȤǤ롣
.PP
.BR setstate ()
ؿϡ
.BR random ()
ǻѤѹ롣
\fIstate\fP ϡ
.BR initstate ()
ޤ
.BR setstate ()
˸ƤӽФޤǡ˻Ѥ롣
\fIstate\fP
.BR initstate ()
Ѥƺǽ˽Ƥ뤫
˸ƤӽФ
.BR setstate ()
η̤ǤʤФʤʤ
.SH ֤
.BR random ()
ؿ 0
.B RAND_MAX
δ֤֤ͤ
.BR srandom ()
ؿ֤ͤʤ
.BR initstate ()
ؿ
.BR setstate ()
ؿ
ľξؤΥݥޤ NULL ֤
.SH 顼
.TP
.B EINVAL
.BR initstate ()
8ХȤ⾮ꤷ
.SH
4.3BSD, POSIX.1-2001.
.SH
\fIn\fP 礭θߤΡֺŬͤ
83264128256 ХȤǤ롣
¾̤ꤷˤϡꤷ̤ۤʤҤͤ
Ǥᤤͤˤʤ롣
8 Х̤̤ꤷˤϥ顼θȤʤ롣
.SH Ϣ
.BR rand (3),
.BR srand (3)
|
