#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 since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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().
| 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 |