rand_r man page on HP-UX

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rand(3C)							      rand(3C)

NAME
       rand(), rand_r(), srand() - simple random-number generator

SYNOPSIS
DESCRIPTION
       uses  a	multiplicative,	 congruential,	random-number  generator  with
       period 2^32 that returns successive pseudo-random numbers in the	 range
       from 0 to 2^15-1.

       can  be	called	at  any time to reset the random-number generator to a
       random starting point.  The generator is initially seeded with a	 value
       of 1.

       returns a random number at the address pointed to by the randval param‐
       eter.  The seed parameter can be set at any time to start  the  random-
       number generator at an arbitrary point.

   Note
       The  spectral properties of leave a great deal to be desired.  provides
       a much better, though  more  elaborate,	random-number  generator  (see
       drand48(3C)).

RETURN VALUE
       If  seed	 or  randval is NULL, returns 0.  Otherwise, returns a psuedo-
       random integer.

EXAMPLES
       The following:

	      int x, y;
	      srand(10);
	      x = rand();
	      y = rand();

       would produce the same results as:

	      int x, y, s = 10;
	      x=rand_r(&s);
	      y=rand_r(&s);

WARNINGS
       Users of should note that rand_r() now conforms with POSIX.1c.  The old
       prototype  of is supported for compatibility with existing DCE applica‐
       tions only.

SEE ALSO
       drand48(3C), random(3M), thread_safety(5), random(7).

STANDARDS CONFORMANCE
								      rand(3C)
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