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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | SEE ALSO | COLOPHON |
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drand48_r(3) Library Functions Manual drand48_r(3)
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
Standard C library (libc, -lc)
#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
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().
The return value is 0.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────┬───────────────┬─────────────────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────┼───────────────┼─────────────────────┤
│ drand48_r(), │ Thread safety │ MT-Safe race:buffer │
│ erand48_r(), │ │ │
│ lrand48_r(), │ │ │
│ nrand48_r(), │ │ │
│ mrand48_r(), │ │ │
│ jrand48_r(), │ │ │
│ srand48_r(), │ │ │
│ seed48_r(), lcong48_r() │ │ │
└─────────────────────────┴───────────────┴─────────────────────┘
GNU.
drand48(3), rand(3), random(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
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⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2024-06-26. If you discover any rendering problems in this HTML
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[email protected]
Linux man-pages 6.9.1 2024-05-02 drand48_r(3)
Pages that refer to this page: rand(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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