| .\" Copyright 2003 Walter Harms, 2004 Andries Brouwer <aeb@cwi.nl>. |
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| .\" Created 2004-10-31. Text taken from a page by Walter Harms, 2003-09-08 |
| .\" |
| .TH DRAND48_R 3 2021-03-22 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, |
| srand48_r, seed48_r, lcong48_r |
| \- generate uniformly distributed pseudo-random numbers reentrantly |
| .SH SYNOPSIS |
| .nf |
| .B #include <stdlib.h> |
| .PP |
| .BI "int drand48_r(struct drand48_data *restrict " buffer , |
| .BI " double *restrict " result ); |
| .BI "int erand48_r(unsigned short " xsubi [3] "," |
| .BI " struct drand48_data *restrict "buffer , |
| .BI " double *restrict " result ");" |
| .PP |
| .BI "int lrand48_r(struct drand48_data *restrict " buffer , |
| .BI " long *restrict " result ); |
| .BI "int nrand48_r(unsigned short " xsubi[3] "," |
| .BI " struct drand48_data *restrict "buffer , |
| .BI " long *restrict " result ");" |
| .PP |
| .BI "int mrand48_r(struct drand48_data *restrict " buffer , |
| .BI " long *restrict " result ");" |
| .BI "int jrand48_r(unsigned short " xsubi[3] "," |
| .BI " struct drand48_data *restrict " buffer , |
| .BI " long *restrict " result ");" |
| .PP |
| .BI "int srand48_r(long int " seedval ", struct drand48_data *" buffer ");" |
| .BI "int seed48_r(unsigned short " seed16v[3] ", struct drand48_data *" buffer ); |
| .BI "int lcong48_r(unsigned short " param[7] ", struct drand48_data *" buffer ); |
| .fi |
| .PP |
| .RS -4 |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .RE |
| .PP |
| All functions shown above: |
| .\" .BR drand48_r (), |
| .\" .BR erand48_r (), |
| .\" .BR lrand48_r (), |
| .\" .BR nrand48_r (), |
| .\" .BR mrand48_r (), |
| .\" .BR jrand48_r (), |
| .\" .BR srand48_r (), |
| .\" .BR seed48_r (), |
| .\" .BR lcong48_r (): |
| .nf |
| /* Glibc since 2.19: */ _DEFAULT_SOURCE |
| || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE |
| .fi |
| .SH DESCRIPTION |
| These functions are the reentrant analogs of the functions described in |
| .BR drand48 (3). |
| Instead of modifying the global random generator state, they use |
| the supplied data |
| .IR buffer . |
| .PP |
| Before the first use, this struct must be initialized, for example, |
| by filling it with zeros, or by calling one of the functions |
| .BR srand48_r (), |
| .BR seed48_r (), |
| or |
| .BR lcong48_r (). |
| .SH RETURN VALUE |
| The return value is 0. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .ad l |
| .nh |
| .TS |
| allbox; |
| lbx lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR drand48_r (), |
| .BR erand48_r (), |
| .BR lrand48_r (), |
| .BR nrand48_r (), |
| .BR mrand48_r (), |
| .BR jrand48_r (), |
| .BR srand48_r (), |
| .BR seed48_r (), |
| .BR lcong48_r () |
| T} Thread safety MT-Safe race:buffer |
| .TE |
| .hy |
| .ad |
| .sp 1 |
| .SH CONFORMING TO |
| These functions are GNU extensions and are not portable. |
| .SH SEE ALSO |
| .BR drand48 (3), |
| .BR rand (3), |
| .BR random (3) |