drand48_r - Man Page

Standard C library (libc, -lc)

#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);

All functions shown above:

    /* glibc >= 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

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().

The return value is 0.

For an explanation of the terms used in this section, see attributes(7).

GNU.

drand48(3), rand(3), random(3)

rand(3).

The man pages erand48_r(3), jrand48_r(3), lcong48_r(3), lrand48_r(3), mrand48_r(3), nrand48_r(3), seed48_r(3) and srand48_r(3) are aliases of drand48_r(3).