lcong48_r(3)

1drand48_r(3)               Library Functions 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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LIBRARY

11       Standard C library (libc, -lc)
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SYNOPSIS

14       #include <stdlib.h>
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16       int drand48_r(struct drand48_data *restrict buffer,
17                     double *restrict result);
18       int erand48_r(unsigned short xsubi[3],
19                     struct drand48_data *restrict buffer,
20                     double *restrict result);
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22       int lrand48_r(struct drand48_data *restrict buffer,
23                     long *restrict result);
24       int nrand48_r(unsigned short xsubi[3],
25                     struct drand48_data *restrict buffer,
26                     long *restrict result);
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28       int mrand48_r(struct drand48_data *restrict buffer,
29                     long *restrict result);
30       int jrand48_r(unsigned short xsubi[3],
31                     struct drand48_data *restrict buffer,
32                     long *restrict result);
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34       int srand48_r(long int seedval, struct drand48_data *buffer);
35       int seed48_r(unsigned short seed16v[3], struct drand48_data *buffer);
36       int lcong48_r(unsigned short param[7], struct drand48_data *buffer);
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38   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
39
40       All functions shown above:
41           /* glibc >= 2.19: */ _DEFAULT_SOURCE
42               || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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DESCRIPTION

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

54       The return value is 0.
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ATTRIBUTES

57       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
58       tributes(7).
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60       ┌────────────────────────────────┬───────────────┬─────────────────────┐
61       │Interface                       │ Attribute     │ Value               │
62       ├────────────────────────────────┼───────────────┼─────────────────────┤
63       │drand48_r(), erand48_r(),       │ Thread safety │ MT-Safe race:buffer │
64       │lrand48_r(), nrand48_r(),       │               │                     │
65       │mrand48_r(), jrand48_r(),       │               │                     │
66       │srand48_r(), seed48_r(),        │               │                     │
67       │lcong48_r()                     │               │                     │
68       └────────────────────────────────┴───────────────┴─────────────────────┘
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STANDARDS

71       GNU.
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