1DRAND48_R(3)               Linux Programmer's Manual              DRAND48_R(3)
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NAME

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

11       #include <stdlib.h>
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13       int drand48_r(struct drand48_data *buffer, double *result);
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15       int erand48_r(unsigned short xsubi[3],
16                     struct drand48_data *buffer, double *result);
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18       int lrand48_r(struct drand48_data *buffer, long int *result);
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20       int nrand48_r(unsigned short int xsubi[3],
21                     struct drand48_data *buffer, long int *result);
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23       int mrand48_r(struct drand48_data *buffer,long int *result);
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25       int jrand48_r(unsigned short int xsubi[3],
26                     struct drand48_data *buffer, long int *result);
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28       int srand48_r(long int seedval, struct drand48_data *buffer);
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30       int seed48_r(unsigned short int seed16v[3],
31                    struct drand48_data *buffer);
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33       int lcong48_r(unsigned short int param[7],
34                     struct drand48_data *buffer);
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36   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
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38       All functions shown above:
39           /* Glibc since 2.19: */ _DEFAULT_SOURCE
40               || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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DESCRIPTION

43       These functions are the reentrant analogs of the functions described in
44       drand48(3).  Instead of modifying the global  random  generator  state,
45       they use the supplied data buffer.
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47       Before  the first use, this struct must be initialized, for example, by
48       filling it with zeros, or by calling one of the functions  srand48_r(),
49       seed48_r(), or lcong48_r().
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RETURN VALUE

52       The return value is 0.
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ATTRIBUTES

55       For   an   explanation   of   the  terms  used  in  this  section,  see
56       attributes(7).
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58       ┌──────────────────────────┬───────────────┬─────────────────────┐
59       │Interface                 │ Attribute     │ Value               │
60       ├──────────────────────────┼───────────────┼─────────────────────┤
61       │drand48_r(), erand48_r(), │ Thread safety │ MT-Safe race:buffer │
62       │lrand48_r(), nrand48_r(), │               │                     │
63       │mrand48_r(), jrand48_r(), │               │                     │
64       │srand48_r(), seed48_r(),  │               │                     │
65       │lcong48_r()               │               │                     │
66       └──────────────────────────┴───────────────┴─────────────────────┘

CONFORMING TO

68       These functions are GNU extensions and are not portable.
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SEE ALSO

71       drand48(3), rand(3), random(3)
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COLOPHON

74       This page is part of release 4.16 of the Linux  man-pages  project.   A
75       description  of  the project, information about reporting bugs, and the
76       latest    version    of    this    page,    can     be     found     at
77       https://www.kernel.org/doc/man-pages/.
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81GNU                               2017-09-15                      DRAND48_R(3)
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