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Linux 2.6 - man page for drand48_r (linux section 3)

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 reentrantly

SYNOPSIS
       #include <stdlib.h>

       int drand48_r(struct drand48_data *buffer, double *result);

       int erand48_r(unsigned short xsubi[3],
		     struct drand48_data *buffer, double *result);

       int lrand48_r(struct drand48_data *buffer, long int *result);

       int nrand48_r(unsigned short int xsubi[3],
		     struct drand48_data *buffer, long int *result);

       int mrand48_r(struct drand48_data *buffer,long int *result);

       int jrand48_r(unsigned short int xsubi[3],
		     struct drand48_data *buffer, long int *result);

       int srand48_r(long int seedval, struct drand48_data *buffer);

       int seed48_r(unsigned short int seed16v[3],
		    struct drand48_data *buffer);

       int lcong48_r(unsigned short int param[7],
		     struct drand48_data *buffer);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       All functions shown above: _SVID_SOURCE || _BSD_SOURCE || _XOPEN_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 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().

RETURN VALUE
       The return value is 0.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The  drand48_r(),  erand48_r(),	lrand48_r(),   nrand48_r(),   mrand48_r(),   jrand48_r(),
       srand48_r(), seed48_r(), and lcong48_r() functions are thread-safe.

CONFORMING TO
       These functions are GNU extensions and are not portable.

SEE ALSO
       drand48(3), rand(3), random(3)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

GNU					    2013-09-09				     DRAND48_R(3)


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