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DRAND48_R(3) Linux Programmer's Manual DRAND48_R(3) 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 reenβ trantly 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 since 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 supβ plied 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). ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬ββββββββββββββββ¬ββββββββββββββββββββββ βInterface β Attribute β Value β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββΌββββββββββββββββΌββββββββββββββββββββββ€ βdrand48_r(), erand48_r(), lrand48_r(), nrand48_r(), mrand48_r(), jrand48_r(), srand48_r(), seed48_r(), lcong48_r() β Thread safety β MT-Safe race:buffer β ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ΄ββββββββββββββββ΄ββββββββββββββββββββββ CONFORMING TO These functions are GNU extensions and are not portable. SEE ALSO drand48(3), rand(3), random(3) GNU 2021-03-22 DRAND48_R(3)