man3/drand48_r.3

   1 .\" Copyright 2003 Walter Harms, 2004 Andries Brouwer <aeb@cwi.nl>.
   2 .\"
   3 .\" Permission is granted to make and distribute verbatim copies of this
   4 .\" manual provided the copyright notice and this permission notice are
   5 .\" preserved on all copies.
   6 .\"
   7 .\" Permission is granted to copy and distribute modified versions of this
   8 .\" manual under the conditions for verbatim copying, provided that the
   9 .\" entire resulting derived work is distributed under the terms of a
  10 .\" permission notice identical to this one.
  11 .\"
  12 .\" Since the Linux kernel and libraries are constantly changing, this
  13 .\" manual page may be incorrect or out-of-date.  The author(s) assume no
  14 .\" responsibility for errors or omissions, or for damages resulting from
  15 .\" the use of the information contained herein.  The author(s) may not
  16 .\" have taken the same level of care in the production of this manual,
  17 .\" which is licensed free of charge, as they might when working
  18 .\" professionally.
  19 .\"
  20 .\" Formatted or processed versions of this manual, if unaccompanied by
  21 .\" the source, must acknowledge the copyright and authors of this work.
  22 .\"
  23 .\" Created 2004-10-31. Text taken from a page by Walter Harms, 2003-09-08
  24 .\"
  25 .TH DRAND48_R 3 2004-10-31 "GNU" "Linux Programmer's Manual"
  26 .SH NAME
  27 drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r,
  28 srand48_r, seed48_r, lcong48_r
  29 \- generate uniformly distributed pseudo-random numbers reentrantly
  30 .SH SYNOPSIS
  31 .nf
  32 .B #include <stdlib.h>
  33 .sp
  34 .BI "int drand48_r(struct drand48_data *" buffer ", double *" result );
  35 .sp
  36 .BI "int erand48_r(unsigned short " xsubi [3] ","
  37 .br
  38 .BI "              struct drand48_data *"buffer ", double *" result ");"
  39 .sp
  40 .BI "int lrand48_r(struct drand48_data *" buffer ", long int *" result );
  41 .sp
  42 .BI "int nrand48_r(unsigned short int " xsubi[3] ","
  43 .br
  44 .BI "              struct drand48_data *"buffer ", long int *" result ");"
  45 .sp
  46 .BI "int mrand48_r(struct drand48_data *" buffer ",long int *" result ");"
  47 .sp
  48 .BI "int jrand48_r(unsigned short int " xsubi[3] ","
  49 .br
  50 .BI "              struct drand48_data *" buffer ", long int *" result ");"
  51 .sp
  52 .BI "int srand48_r(long int " seedval ", struct drand48_data *" buffer ");"
  53 .sp
  54 .BI "int seed48_r(unsigned short int " seed16v[3] ","
  55 .br
  56 .BI "             struct drand48_data *" buffer ");"
  57 .sp
  58 .BI "int lcong48_r(unsigned short int " param[7] ","
  59 .br
  60 .BI "              struct drand48_data *" buffer ");"
  61 .fi
  62 .SH DESCRIPTION
  63 These functions are the reentrant analogs of the functions described in
  64 .BR drand48 (3).
  65 Instead of modifying the global random generator state, they use
  66 the supplied data
  67 .IR buffer .
  68
  69 Before the first use, this struct must be initialized, e.g.
  70 by filling it with zeroes, or by calling one of the functions
  71 .BR srand48_r() ,
  72 .BR seed48_r() ,
  73 or
  74 .BR lcong48_r() .
  75 .SH "RETURN VALUE"
  76 The return value is 0.
  77 .SH "CONFORMING TO"
  78 These functions are GNU extensions and are not portable.
  79 .SH "SEE ALSO"
  80 .BR drand48 (3),
  81 .BR rand (3),
  82 .BR random (3)