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.\" Copyright 2003 Walter Harms, 2004 Andries Brouwer <aeb@cwi.nl>.
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" Created 2004-10-31. Text taken from a page by Walter Harms, 2003-09-08
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.\"
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.TH DRAND48_R 3 2017-09-15 "GNU" "Linux Programmer's Manual"
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.SH NAME
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drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r,
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srand48_r, seed48_r, lcong48_r
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\- generate uniformly distributed pseudo-random numbers reentrantly
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.SH SYNOPSIS
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.nf
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.B #include <stdlib.h>
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.PP
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.BI "int drand48_r(struct drand48_data *" buffer ", double *" result );
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.PP
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.BI "int erand48_r(unsigned short " xsubi [3] ","
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.BI " struct drand48_data *"buffer ", double *" result ");"
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.PP
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.BI "int lrand48_r(struct drand48_data *" buffer ", long int *" result );
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.PP
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.BI "int nrand48_r(unsigned short int " xsubi[3] ","
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.BI " struct drand48_data *"buffer ", long int *" result ");"
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.PP
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.BI "int mrand48_r(struct drand48_data *" buffer ",long int *" result ");"
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.PP
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.BI "int jrand48_r(unsigned short int " xsubi[3] ","
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.BI " struct drand48_data *" buffer ", long int *" result ");"
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.PP
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.BI "int srand48_r(long int " seedval ", struct drand48_data *" buffer ");"
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.PP
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.BI "int seed48_r(unsigned short int " seed16v[3] ","
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.BI " struct drand48_data *" buffer ");"
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.PP
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.BI "int lcong48_r(unsigned short int " param[7] ","
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.BI " struct drand48_data *" buffer ");"
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.fi
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.PP
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.PP
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.ad l
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All functions shown above:
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.\" .BR drand48_r (),
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.\" .BR erand48_r (),
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.\" .BR lrand48_r (),
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.\" .BR nrand48_r (),
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.\" .BR mrand48_r (),
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.\" .BR jrand48_r (),
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.\" .BR srand48_r (),
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.\" .BR seed48_r (),
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.\" .BR lcong48_r ():
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/* Glibc since 2.19: */ _DEFAULT_SOURCE
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|| /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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.ad b
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.SH DESCRIPTION
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These functions are the reentrant analogs of the functions described in
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.BR drand48 (3).
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Instead of modifying the global random generator state, they use
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the supplied data
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.IR buffer .
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.PP
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Before the first use, this struct must be initialized, for example,
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by filling it with zeros, or by calling one of the functions
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.BR srand48_r (),
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.BR seed48_r (),
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or
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.BR lcong48_r ().
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.SH RETURN VALUE
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The return value is 0.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.ad l
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.TS
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allbox;
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lbw25 lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR drand48_r (),
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.BR erand48_r (),
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.BR lrand48_r (),
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.BR nrand48_r (),
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.BR mrand48_r (),
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.BR jrand48_r (),
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.BR srand48_r (),
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.BR seed48_r (),
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.BR lcong48_r ()
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T} Thread safety MT-Safe race:buffer
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.TE
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.ad
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.SH CONFORMING TO
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These functions are GNU extensions and are not portable.
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.SH SEE ALSO
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.BR drand48 (3),
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.BR rand (3),
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.BR random (3)
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.SH COLOPHON
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This page is part of release 4.15 of the Linux
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.I man-pages
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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\%https://www.kernel.org/doc/man\-pages/.
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