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 reentrantlyLibrary
Standard 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
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 databuffer. 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 |
| T} | Thread safety | MT-Safe race:buffer |