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
SYNOPSIS
#include <stdlib.h>
int drand48_r(struct drand48_data *buffer, double *result);
int
erand48_r(unsigned short xsubi[3],
struct drand48_data *buffer, double
*result);
int lrand48_r(struct drand48_data *buffer, long *result);
int
nrand48_r(unsigned short xsubi[3],
struct drand48_data *buffer, long
*result);
int mrand48_r(struct drand48_data *buffer,long *result);
int
jrand48_r(unsigned short xsubi[3],
struct drand48_data *buffer, long
*result);
int srand48_r(long int seedval, struct drand48_data *buffer);
int
seed48_r(unsigned short seed16v[3],
struct drand48_data *buffer);
int
lcong48_r(unsigned short param[7],
struct drand48_data *buffer);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
All functions
shown above:
/* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE ||
_BSD_SOURCE
DESCRIPTION
These functions are the reentrant analogs of the functions described in drand48(3). Instead of modifying the global random generator state, they use the supplied data buffer.
Before the first use, this struct must be initialized, for example, by filling it with zeros, or by calling one of the functions srand48_r(), seed48_r(), or lcong48_r().
RETURN VALUE
The return value is 0.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
CONFORMING TO
These functions are GNU extensions and are not portable.
SEE ALSO
drand48(3), rand(3), random(3)
COLOPHON
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