NAME    [Toc]    [Back]

     rand, srand - bad random number generator

SYNOPSIS    [Toc]    [Back]

     #include <stdlib.h>

     void
     srand(unsigned int seed);

     int
     rand(void);

     int
     rand_r(unsigned int *seed);

DESCRIPTION    [Toc]    [Back]

     These interfaces are obsoleted by random(3).

     The rand() function computes a sequence of pseudo-random integers in the
     range  of  0  to  RAND_MAX  (as  defined  by the header file
<stdlib.h>).

     The srand() function sets its argument as the seed for a new
sequence of
     pseudo-random  numbers  to be returned by rand().  These sequences are repeatable
 by calling srand() with the same seed value.

     If no seed value is provided, the functions are automatically seeded with
     a value of 1.

     The  rand_r()  is  a thread-safe version of rand().  Storage
for the seed
     must be provided through the seed  argument,  and  needs  to
have been initialized
 by the caller.

SEE ALSO    [Toc]    [Back]

     arc4random(3), rand48(3), random(3)

STANDARDS    [Toc]    [Back]

     The rand() and srand() functions conform to ANSI X3.159-1989
(``ANSI
     C'').

     The rand_r() function conforms to ISO/IEC  9945-1  ANSI/IEEE
(``POSIX'')
     Std 1003.1c Draft 10.

OpenBSD      3.6                           June      29,     1991