drand48_r(3) - BetterMan

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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

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

bash

#include <stdlib.h>

bash

int drand48_r(struct drand48_data *restrict \nbuffer\n,\n
\n              double *restrict \nresult\n);\n
\nint erand48_r(unsigned short \nxsubi\n[3]\n,\n
\n              struct drand48_data *restrict \nbuffer\n,\n
\n              double *restrict \nresult\n);

bash

int lrand48_r(struct drand48_data *restrict \nbuffer\n,\n
\n              long *restrict \nresult\n);\n
\nint nrand48_r(unsigned short \nxsubi[3]\n,\n
\n              struct drand48_data *restrict \nbuffer\n,\n
\n              long *restrict \nresult\n);

bash

int mrand48_r(struct drand48_data *restrict \nbuffer\n,\n
\n              long *restrict \nresult\n);\n
\nint jrand48_r(unsigned short \nxsubi[3]\n,\n
\n              struct drand48_data *restrict \nbuffer\n,\n
\n              long *restrict \nresult\n);

bash

int srand48_r(long int \nseedval\n, struct drand48_data *\nbuffer\n);\n
\nint seed48_r(unsigned short \nseed16v[3]\n, struct drand48_data *\nbuffer\n);\n
\nint lcong48_r(unsigned short \nparam[7]\n, struct drand48_data *\nbuffer\n);

All functions shown above:

bash


\n
    /* glibc >= 2.19: */ _DEFAULT_SOURCE
\n
        || /* glibc <= 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).

Interface	Attribute	Value
drand48_r (), erand48_r (), lrand48_r (), nrand48_r (), mrand48_r (), jrand48_r (), srand48_r (), seed48_r (), lcong48_r ()	Thread safety	MT-Safe race:buffer

STANDARDS

GNU.