rand(3) - NetBSD Manual Pages

RAND(3)                   NetBSD Programmer's Manual                   RAND(3)


NAME

     rand, srand, rand_r - bad random number generator


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <stdlib.h>

     void
     srand(unsigned int seed);

     int
     rand(void);

     int
     rand_r(unsigned int *seed);


DESCRIPTION

     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 re-
     peatable by calling srand() with the same seed value.

     If no seed value is provided, the rand() function is automatically seeded
     with a value of 1.

     The rand_r() function is a reentrant interface to rand(); the seed has to
     be supplied and is maintained by the caller.


SEE ALSO

     random(3)


STANDARDS

     The rand() and srand() functions conform to ANSI X3.159-1989 (``ANSI
     C'').  The rand_r() function conforms to IEEE Std1003.1c-1995
     (``POSIX'').

NetBSD 1.4                       June 4, 1993                                1