drand48_r - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03
NAMEdrand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r − generate uniformly distributed pseudo-random numbers reentrantly
LIBRARYStandard C library (libc, −lc)
SYNOPSIS#include <stdlib.h>int drand48_r(struct drand48_data *restrict buffer,
double *restrict result);
int erand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
double *restrict result);int lrand48_r(struct drand48_data *restrict buffer,
long *restrict result);
int nrand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
long *restrict result);int mrand48_r(struct drand48_data *restrict buffer,
long *restrict result);
int jrand48_r(unsigned short xsubi[3],
struct drand48_data *restrict buffer,
long *restrict 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 >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
DESCRIPTIONThese 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 VALUEThe return value is 0.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue drand48_r(), erand48_r(), lrand48_r(), nrand48_r(), mrand48_r(), jrand48_r(), srand48_r(), seed48_r(), lcong48_r() Thread safetyMT-Safe race:buffer
STANDARDSThese functions are GNU extensions and are not portable.
SEE ALSOdrand48(3), rand(3), random(3) 0
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