drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r -

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────┬───────────────┬─────────────────────┐
       │ Interface                                                       │ Attribute     │ Value               │
       ├─────────────────────────────────────────────────────────────────┼───────────────┼─────────────────────┤
       │ drand48_r(), erand48_r(), lrand48_r(), nrand48_r(),             │ Thread safety │ MT-Safe race:buffer │
       │ mrand48_r(), jrand48_r(), srand48_r(), seed48_r(), lcong48_r()  │               │                     │
       └─────────────────────────────────────────────────────────────────┴───────────────┴─────────────────────┘

       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().

       Standard C library (libc, -lc)

       drand48_r,  erand48_r,  lrand48_r,  nrand48_r,  mrand48_r,  jrand48_r,  srand48_r,  seed48_r, lcong48_r -
       generate uniformly distributed pseudo-random numbers reentrantly

       The return value is 0.

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

Linux man-pages 6.9.1                              2024-05-02                                       drand48_r(3)

       GNU.

#include<stdlib.h>intdrand48_r(structdrand48_data*restrictbuffer,double*restrictresult);interand48_r(unsignedshortxsubi[3],structdrand48_data*restrictbuffer,double*restrictresult);intlrand48_r(structdrand48_data*restrictbuffer,long*restrictresult);intnrand48_r(unsignedshortxsubi[3],structdrand48_data*restrictbuffer,long*restrictresult);intmrand48_r(structdrand48_data*restrictbuffer,long*restrictresult);intjrand48_r(unsignedshortxsubi[3],structdrand48_data*restrictbuffer,long*restrictresult);intsrand48_r(longintseedval,structdrand48_data*buffer);intseed48_r(unsignedshortseed16v[3],structdrand48_data*buffer);intlcong48_r(unsignedshortparam[7],structdrand48_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